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Kraft mill effluents are characterized by their content of suspended solids, organic matter and color due to the presence of lignin, lignin derivatives and tannins. Additionally, Kraft mill effluents contain adsorbable organic halogens and wood extractive compounds (resin acids, fatty acids, phytosterol) and show high conductivity due to the chemical compounds used in the digestion process of pulp. Currently, Kraft mills are operating under the concept of a linear economy and, therefore, their effluents are generating serious toxicity effects, detected in daphnia, fish and biosensors. These effluents are treated by activated sludge and moving bed biofilm systems that are unable to remove recalcitrant organic matter, color and biological activity (toxicity) from effluents. Moreover, under climate change, these environmental effects are being exacerbated and some mills have had to stop their operation when the flows of aquatic ecosystems are lower. The aim of this review is to discuss the treatment of Kraft pulp mill effluents and their impact regarding the current practices and future perspectives towards sustainability under climate change. Kraft pulp mill sustainability involves the closure of water circuits in order to recirculate water and reduce the environmental impact, as well as the implementation of advanced technology for these purposes.
Gladys Vidal; Yenifer González; Benjamín Piña; Mayra Jarpa; Gloria Gómez. Minimization of Environmental Impact of Kraft Pulp Mill Effluents: Current Practices and Future Perspectives towards Sustainability. Sustainability 2021, 13, 9288 .
AMA StyleGladys Vidal, Yenifer González, Benjamín Piña, Mayra Jarpa, Gloria Gómez. Minimization of Environmental Impact of Kraft Pulp Mill Effluents: Current Practices and Future Perspectives towards Sustainability. Sustainability. 2021; 13 (16):9288.
Chicago/Turabian StyleGladys Vidal; Yenifer González; Benjamín Piña; Mayra Jarpa; Gloria Gómez. 2021. "Minimization of Environmental Impact of Kraft Pulp Mill Effluents: Current Practices and Future Perspectives towards Sustainability." Sustainability 13, no. 16: 9288.
The main objective of this study was to apply multivariate analysis, such as principal component analysis (PCA), to determine the influence of water quality parameters on the removal of triclosan (TCS) and ibuprofen (IB) in vertical subsurface flow constructed wetlands (VSSFs). For this purpose, two VSSFs were operated under TCS and IB concentrations of 10 μg/L. One VSSF system was planted with Agapanthus africanus and the other was left unplanted and used as a control. To determine the influence of water quality parameters on TCS and IB removal, the removal efficiencies for TCS, IB, organic matter and nutrients in VSSF systems were determined. Using these data, PCA was performed. The TCS and IB removal efficiencies in VSSF systems were found to vary between 60%–85% and 50%–84%, respectively. Regarding the effects of water quality parameters on TCS and IB removal, PCA showed that TCS removal has a strong association with the oxidation reduction potential. This result confirms that aerobic conditions for VSSF systems promote the removal of the TCS compound. For the case of IB, an association between IB and biological oxygen demand removal was observed. However, this relation was found to be not significant. This study reveals that PCA allows us to determine the association between different variables in VSSF systems. Moreover, this work will serve as the basis for future research for optimizing the performance for removing TCS and IB by focusing on the improvement of aerobic conditions.
Ana María Leiva; Elizabeth Gutierrez; Carlos Alberto Arias; Gladys Vidal. Influence of water quality parameters on the removal of triclosan and ibuprofen in vertical subsurface flow constructed wetlands using multivariate analysis. Environmental Technology & Innovation 2021, 101846 .
AMA StyleAna María Leiva, Elizabeth Gutierrez, Carlos Alberto Arias, Gladys Vidal. Influence of water quality parameters on the removal of triclosan and ibuprofen in vertical subsurface flow constructed wetlands using multivariate analysis. Environmental Technology & Innovation. 2021; ():101846.
Chicago/Turabian StyleAna María Leiva; Elizabeth Gutierrez; Carlos Alberto Arias; Gladys Vidal. 2021. "Influence of water quality parameters on the removal of triclosan and ibuprofen in vertical subsurface flow constructed wetlands using multivariate analysis." Environmental Technology & Innovation , no. : 101846.
The reuse of treated wastewater (TWW) has been considered a suitable alternative for agriculture and for achieving water security and management. However, this practice may contribute to the dissemination of antibiotic resistance genes (ARGs) into the environment, a matter of global concern. The aim of this study is to discuss the reuse of TWW in agriculture under the perspective of the risks associated to ARGs dissemination. An exhaustive bibliographic research was conducted for determining the capacity of reducing ARG loads for different wastewater treatment technologies (conventional, non-conventional and advanced technologies). Moreover, the distribution of ARG elements in crops irrigated with TWW was also reviewed for discussing the potential health risks associated to the TWW reuse. Reduction of ARG loads in conventional, non-conventional and advanced treatments fluctuated between 1.1 and 4.1, 0.1–2.1 and 0.1–9.5 log units, respectively. These variable ranges indicate that operational parameters, plant design, and water quality are fundamental parameters determining their performance and their capacity to reduce ARG dissemination. In the case of ARG distribution in crops and soil irrigated by TWW, higher abundances were observed in soil than edible parts of crops with ranges between (− 0.7)—6.0 log copies/g of soil and (− 0.9)—5.6 log copies/g of soil, respectively. The occurrence of ARGs in crops may represent a relevant human exposure to ARG-harbouring bacteria and therefore, a potential human health risk that requires the establishment of safe procedures and legislation for assuring a safe reuse of TWW.
Ana María Leiva; Benjamín Piña; Gladys Vidal. Antibiotic resistance dissemination in wastewater treatment plants: a challenge for the reuse of treated wastewater in agriculture. Reviews in Environmental Science and Bio/Technology 2021, 1 -30.
AMA StyleAna María Leiva, Benjamín Piña, Gladys Vidal. Antibiotic resistance dissemination in wastewater treatment plants: a challenge for the reuse of treated wastewater in agriculture. Reviews in Environmental Science and Bio/Technology. 2021; ():1-30.
Chicago/Turabian StyleAna María Leiva; Benjamín Piña; Gladys Vidal. 2021. "Antibiotic resistance dissemination in wastewater treatment plants: a challenge for the reuse of treated wastewater in agriculture." Reviews in Environmental Science and Bio/Technology , no. : 1-30.
Global crop production is limited by water, nitrogen, and phosphorous availability. Reclaimed water and organic fertilizers, such as crop residues, animal manure, and biosolids, can mitigate these needs. However, these materials may contain different pollutants arising from, among others, human and veterinarian health care, industry, cleaning media, or leakages from plastics or textiles. The European PRIMA-DSWAP project deals with the risks derived from these practices in relation to the presence of the so-called contaminants of emerging concern, or CECs, while exploring possible technical and mitigation measures to minimize those impacts. Risk assessment analyses of the CEC presence in soils and water bodies have been mainly focused in their consequences for human and environmental health, but very little has been studied about their potential negative effects on crop performance and quality. Here we review the current knowledge on macroscopic and molecular plant responses to the presence of several CECs known to abound in reclaimed waters, manure, and biosolids, with particular emphasis on crop plants, when available. With this information, and with the analysis of the potential implications of scaling these effects to the commercial agricultural level, we intend to contribute to the ongoing debate on the water reuse and biosolid application in agriculture in the context of circular economy.
Sylvia Mansilla; José Portugal; Josep M. Bayona; Victor Matamoros; Ana María Leiva; Gladys Vidal; Benjamin Piña. Compounds of emerging concern as new plant stressors linked to water reuse and biosolid application in agriculture. Journal of Environmental Chemical Engineering 2021, 9, 105198 .
AMA StyleSylvia Mansilla, José Portugal, Josep M. Bayona, Victor Matamoros, Ana María Leiva, Gladys Vidal, Benjamin Piña. Compounds of emerging concern as new plant stressors linked to water reuse and biosolid application in agriculture. Journal of Environmental Chemical Engineering. 2021; 9 (3):105198.
Chicago/Turabian StyleSylvia Mansilla; José Portugal; Josep M. Bayona; Victor Matamoros; Ana María Leiva; Gladys Vidal; Benjamin Piña. 2021. "Compounds of emerging concern as new plant stressors linked to water reuse and biosolid application in agriculture." Journal of Environmental Chemical Engineering 9, no. 3: 105198.
In this work, the Fenton technology was applied to decolorize methylene blue (MB) and to inactivate Escherichia coli K12, used as recalcitrant compound and bacteria models respectively, in order to provide an approach into single and combinative effects of the main process variables influencing the Fenton technology. First, Box–Behnken design (BBD) was applied to evaluate and optimize the individual and interactive effects of three process parameters, namely Fe2+ concentration (6.0 × 10−4, 8.0 × 10−4 and 1.0 × 10−3 mol/L), molar ratio between H2O2 and Fe2+ (1:1, 2:1 and 3:1) and pH (3.0, 4.0 and 5.0) for Fenton technology. The responses studied in these models were the degree of MB decolorization (D%MB), rate constant of MB decolorization (kappMB) and E. coli K12 inactivation in uLog units (IuLogEC). According to the results of analysis of variances all of the proposed models were adequate with a high regression coefficient (R2 from 0.9911 to 0.9994). BBD results suggest that [H2O2]/[Fe2+] values had a significant effect only on D%MB response, [Fe2+] had a significant effect on all the responses, whereas pH had a significant effect on D%MB and IuLogEC. The optimum conditions obtained from response surface methodology for D%MB ([H2O2]/[Fe2+] = 2.9, [Fe2+] = 1.0 × 10−3 mol/L and pH = 3.2), kappMB ([H2O2]/[Fe2+] = 1.7, [Fe2+] = 1.0 × 10−3 mol/L and PH = 3.7) and IuLogEC ([H2O2]/[Fe2+] = 2.9, [Fe2+] = 7.6 × 10−4 mol/L and pH= 3.2) were in good agreement with the values predicted by the model.
Pablo Salgado; José Luis Frontela; Gladys Vidal. Optimization of Fenton Technology for Recalcitrant Compounds and Bacteria Inactivation. Catalysts 2020, 10, 1483 .
AMA StylePablo Salgado, José Luis Frontela, Gladys Vidal. Optimization of Fenton Technology for Recalcitrant Compounds and Bacteria Inactivation. Catalysts. 2020; 10 (12):1483.
Chicago/Turabian StylePablo Salgado; José Luis Frontela; Gladys Vidal. 2020. "Optimization of Fenton Technology for Recalcitrant Compounds and Bacteria Inactivation." Catalysts 10, no. 12: 1483.
Circular economy (CE) is defined as a system in which the value of products, materials and resources is maintained for as long as possible, minimizing their consumption and the generation of waste. Within the CE framework, anaerobic digestion (AD) represents an attractive technology, as it uses waste to produce biogas as renewable energy and stabilizes the sewage sludge for land application. In this way, this technology contributes to “closing the loop” between energy consumption, food production and the disposal of the subsequent waste. However, these potential benefits may be limited by negative impacts related to the land disposal of the stabilized sewage sludge. For example, the presence of micropollutants (MPs) in the input sludge and the inability of current AD methods to remove them are recognized potential risks for human health and for the environment. The aim of this review is to provide an overview of the different MPs present in the raw sewage sludge and stabilized sewage sludge (biosolids) with AD, to assess their potential adverse effects, and to highlight possible remediation strategies. This review will focus on three important groups: pharmaceuticals and personal care products (PPCPs), metallic trace elements, and polycyclic aromatic hydrocarbons (PAHs). The resulting toxicity of the biosolids will depend on the operational characteristics of AD and on the physicochemical properties of the different MPs. These two factors ultimately determine their final concentration, their persistence and bioaccumulative potential, and the formation of metabolites, which sometimes can be more toxic than the corresponding parental compounds.
María Venegas; Ana María Leiva; Carolina Reyes-Contreras; Patricio Neumann; Benjamín Piña; Gladys Vidal. Presence and fate of micropollutants during anaerobic digestion of sewage and their implications for the circular economy: A short review. Journal of Environmental Chemical Engineering 2020, 9, 104931 .
AMA StyleMaría Venegas, Ana María Leiva, Carolina Reyes-Contreras, Patricio Neumann, Benjamín Piña, Gladys Vidal. Presence and fate of micropollutants during anaerobic digestion of sewage and their implications for the circular economy: A short review. Journal of Environmental Chemical Engineering. 2020; 9 (1):104931.
Chicago/Turabian StyleMaría Venegas; Ana María Leiva; Carolina Reyes-Contreras; Patricio Neumann; Benjamín Piña; Gladys Vidal. 2020. "Presence and fate of micropollutants during anaerobic digestion of sewage and their implications for the circular economy: A short review." Journal of Environmental Chemical Engineering 9, no. 1: 104931.
The aim was to identify the effects of AM symbiosis on the expression patterns of genes associated with K+ and Na+ compartmentalization and translocation and on K+/Na+ homeostasis in some lettuce (Lactuca sativa) cultivars as well as the effects of the relative abundance of plant AQPs on plant water status. Two AM fungi species (Funneliformis mosseae and Claroideoglomus lamellosum) isolated from the hyper-arid Atacama Desert (northern Chile) were inoculated to two lettuce cultivars (Grand Rapids and Lollo Bionda), and watered with 0 and 60 mM NaCl. At 60 days of plant growth, the AM symbiotic development, biomass production, nutrient content (Pi, Na+, K+), physiological parameters, gene expressions of ion channels and transporters (NHX and HKT1), and aquaporins proteins abundance (phosphorylated and non-phosphorylated) were evaluated. Salinity increased the AM root colonization by both inocula. AM lettuce plants showed an improved growth, increased relative water content and improved of K/Na ratio in root. In Grand Rapids cultivar, the high efficiency of photosystem II was higher than Lollo Bionda cultivar; on the contrary, stomatal conductance was higher in Lollo Bionda. Nevertheless, both parameters were increased by AM colonization. In the same way, LsaHKT1;1, LsaHKT1;6, LsaNHX2, LsaNHX4, LsaNHX6 and LsaNHX8 genes and aquaporins PIP2 were up-regulated differentially by both AM fungi. The improved plant growth was closely related to a higher water status due to increased PIP2 abundance, as well as to the upregulation of LsaNHX gene expression, which concomitantly improved plant nutrition and K+/Na+ homeostasis maintenance.
Christian Santander; Ricardo Aroca; Paula Cartes; Gladys Vidal; Pablo Cornejo. Aquaporins and cation transporters are differentially regulated by two arbuscular mycorrhizal fungi strains in lettuce cultivars growing under salinity conditions. Plant Physiology and Biochemistry 2020, 158, 396 -409.
AMA StyleChristian Santander, Ricardo Aroca, Paula Cartes, Gladys Vidal, Pablo Cornejo. Aquaporins and cation transporters are differentially regulated by two arbuscular mycorrhizal fungi strains in lettuce cultivars growing under salinity conditions. Plant Physiology and Biochemistry. 2020; 158 ():396-409.
Chicago/Turabian StyleChristian Santander; Ricardo Aroca; Paula Cartes; Gladys Vidal; Pablo Cornejo. 2020. "Aquaporins and cation transporters are differentially regulated by two arbuscular mycorrhizal fungi strains in lettuce cultivars growing under salinity conditions." Plant Physiology and Biochemistry 158, no. : 396-409.
The aim of this study was to evaluate the effect of pretreatment on the phytotoxicity and leaching of nitrogen and phosphorus in biosolids from anaerobic digestion in silty loam soil. Soil columns filled with silty loam soil and biosolids (BS) stabilized by conventional (CAD) and advanced (AAD) anaerobic digestion were installed. AAD consisted of the application of sequential pretreatments: ultrasound followed by a low thermal process. The BS loads were equivalent to 30 ton/ha (CAD30 and AAD30) and 90 ton/ha (CAD90 and AAD90), and the soil columns were watered with 29 mL/day of distilled water. Phytotoxicity was evaluated by germination and root growth inhibition and by the germination index (GI) of Triticum aestivum, Lactuca sativa, and Raphanus sativus seeds. Nitrogen leaching varied from 0 to 9 mg/week, while phosphate leaching did not exceed 0.01 mg/week. The nutrient leaching rate depended on the BS application rate and not on the use of pretreatment (p < 0.05). Regarding phytotoxicity, BS application presented a tendency to attenuate the inhibition caused by the silty loam soil, with GI values ranging from 31 to 50%, 62 to 63%, and 70 to 82% for L. sativa, R. sativus, and T. aestivum, respectively. Graphical abstract
Gabriela Fernández; María Venegas; Gladys Vidal. Effect of Pretreatment on Nutrient Leaching and Phytotoxicity of Biosolids from Anaerobic Digestion in Silty Loam Soil. Water, Air, & Soil Pollution 2020, 231, 1 -11.
AMA StyleGabriela Fernández, María Venegas, Gladys Vidal. Effect of Pretreatment on Nutrient Leaching and Phytotoxicity of Biosolids from Anaerobic Digestion in Silty Loam Soil. Water, Air, & Soil Pollution. 2020; 231 (11):1-11.
Chicago/Turabian StyleGabriela Fernández; María Venegas; Gladys Vidal. 2020. "Effect of Pretreatment on Nutrient Leaching and Phytotoxicity of Biosolids from Anaerobic Digestion in Silty Loam Soil." Water, Air, & Soil Pollution 231, no. 11: 1-11.
The goal of this article is the evaluation of the compost quality from Kraft mill organic matter by germination Raphanus sativus and Lepidium sativum. The evaluation of compost was measured in terms of stability, maturity and phytotoxicity. Two compost piles were elaborated, one with a ratio of C/N = 23.67 and the other with C/N = 18.67. Each pile was divided into 2 sections, pile 1 (compost 1 and 2) and pile 2 (compost 3 and 4). Wood bark was added to each pile as a structuring material, resulting in mixtures conformed by treatment sludge with bark. The results obtained show that all the mixtures reached thermophilic temperatures (>50 °C), resulting in stable and mature compost with humic and fulvic acid ratios > 1.9. The gemination index showed no presence of toxic substances, with germination percentages over 80% for all the tests of Raphanus sativus and Lepidium sativum, while the N:P:K ratio of 0.5 of Compost 4 positively and significantly boosted the growth of both species with respect to control. It was concluded that Compost 4, with C/N ratio = 23.67 with structuring material presented positive and significant results (p > 0.05) with respect to Compost 1, 2 and 3.
M. E. Neubauer; J. P. Miranda; F. Ramírez; A. Esquerra; G. Vidal. Performance of the Kraft Mill Biosolids Compost and Their Quality Evaluation. Compost Science & Utilization 2020, 28, 136 -146.
AMA StyleM. E. Neubauer, J. P. Miranda, F. Ramírez, A. Esquerra, G. Vidal. Performance of the Kraft Mill Biosolids Compost and Their Quality Evaluation. Compost Science & Utilization. 2020; 28 (3-4):136-146.
Chicago/Turabian StyleM. E. Neubauer; J. P. Miranda; F. Ramírez; A. Esquerra; G. Vidal. 2020. "Performance of the Kraft Mill Biosolids Compost and Their Quality Evaluation." Compost Science & Utilization 28, no. 3-4: 136-146.
Microbial fuel cells integrated into constructed wetlands have been previously studied. Nevertheless, their application as a suitable treatment for wastewater is still in the developmental stage. In this context, the aim of this study was to evaluate organic matter removal and nitrogen transformation by a microbial fuel cell integrated into a constructed wetland (CWMFC). To accomplish this, three experimental systems were operated under batch-mode conditions over 170 days: i) one was planted with Schoenoplectus californicus (P-CWMFC); ii) another was unplanted (NP-CWMFC); and iii) the third system did not have any electrodes (CW) and was used as a control. Chemical oxygen demand (COD) removal efficiency ranged between 74–87%, 69–81% and 62–72% for the P-CWMFC, NP-CWMFC and CW systems, respectively, with organic loading rates (OLR) ranging from 4.8 to 7.9 g COD/m2 d. NH4+-N removal efficiency exceeded 98%, 90% and 83% for P-CWMFC, NP-CWMFC and CW, respectively. Wastewater treatment performance was improved due to anaerobic oxidation that occurred on the anodes. Organic matter removal was 18% higher in closed-circuit mode than in open-circuit mode in both integrated systems (P-CWMFC and NP-CWMFC), and these differences were significant (p < 0.05). With respect to the performance of microbial fuel cells, the maximum power density (8.6 mW/m2) was achieved at an organic loading rate of 7.9 g COD/m2 d with an internal resistance and coulombic efficiency of 251 Ω and 2.4%, respectively. The results obtained in this work can provide positive impacts on CW development by enhancing anaerobic degradation without forced aeration.
Thaís González; Jaume Puigagut; Gladys Vidal. Organic matter removal and nitrogen transformation by a constructed wetland-microbial fuel cell system with simultaneous bioelectricity generation. Science of The Total Environment 2020, 753, 142075 .
AMA StyleThaís González, Jaume Puigagut, Gladys Vidal. Organic matter removal and nitrogen transformation by a constructed wetland-microbial fuel cell system with simultaneous bioelectricity generation. Science of The Total Environment. 2020; 753 ():142075.
Chicago/Turabian StyleThaís González; Jaume Puigagut; Gladys Vidal. 2020. "Organic matter removal and nitrogen transformation by a constructed wetland-microbial fuel cell system with simultaneous bioelectricity generation." Science of The Total Environment 753, no. : 142075.
As pre-treatment processes improve biogas production during anaerobic digestion of sewage sludge, it is expected that the microbial communities of digesters will adapt to the exposition to pre-treated substrate in terms of their composition or activity. In this study, the influence of sono-thermal pre-treatment over the microbial communities of digesters operated at decreasing solids retention times (SRT) was assessed. Differences in the microbiome and specific activities were observed and associated with pre-treatment and SRT. Pre-treatment increased methane yields (19.1–29.9%), bacterial range-weighted richness (27.8–46.5%) and archaea concentration (one order of magnitude in terms of 16S rDNA gVS−1), without causing process inhibition or instability. No effect over archaea richness was observed, which was dominated by the presence of acetoclastic methanogens. Hydrolytic and acidogenic activities were similar among the reactors and across SRT, with values of 1.55–2.28 gCOD−1d−1 and 1.45–1.88 gCOD−1d−1, respectively. Methanogenic activity showed a positive correlation with SRT, with values of 0.12–0.13 gCOD gVS−1 d−1 at 7.5 days SRT and 0.31–0.37 gCOD gVS−1 d−1 at 30 days SRT. Overall, the results shown that the main drivers of the observed effects over methane yield and the microbiome were organic loading rate and the solubilization caused by pre-treatment.
Patricio Neumann; Daniela López; Nathaly Ruiz-Tagle; Katherine Sossa; Gladys Vidal. Effect of a Sono-Thermal Pre-treatment Over Methane Production, Specific Activities and the Microbial Community of Sludge Anaerobic Digesters. Waste and Biomass Valorization 2020, 12, 1927 -1941.
AMA StylePatricio Neumann, Daniela López, Nathaly Ruiz-Tagle, Katherine Sossa, Gladys Vidal. Effect of a Sono-Thermal Pre-treatment Over Methane Production, Specific Activities and the Microbial Community of Sludge Anaerobic Digesters. Waste and Biomass Valorization. 2020; 12 (4):1927-1941.
Chicago/Turabian StylePatricio Neumann; Daniela López; Nathaly Ruiz-Tagle; Katherine Sossa; Gladys Vidal. 2020. "Effect of a Sono-Thermal Pre-treatment Over Methane Production, Specific Activities and the Microbial Community of Sludge Anaerobic Digesters." Waste and Biomass Valorization 12, no. 4: 1927-1941.
Phosphorus is a critical element in agriculture because of its role in fertilizing fields. Thus, and due to sewage discharges, phosphorus is also present in aquatic ecosystems, causing eutrophication. Phosphorus can be found in inorganic and organic forms. One solution to phosphorus-related conflicts is the application of technologies for the recovery of phosphorus from wastewater and its possible reuse. However, existing technologies are focused on the elimination/recovery of inorganic phosphorus, while technologies based on combined mechanisms have demonstrated greater efficiency in the treatment of different forms of phosphorus and its recovery. This article reviews the operational factors of the different technologies based on the physical, chemical and biological mechanisms of phosphorus recovery. Emerging combined technologies that have been able to maximize the recovery of organic and inorganic phosphorus from different wastewater streams are also reviewed. Thus, the forms of phosphorus must be understood for the appropriate technology for the recovery different forms of P in wastewater discharges to be chosen, providing environmental protection to aquatic ecosystems.
V. Carrillo; B. Fuentes; G. Gómez; Gladys Vidal. Characterization and recovery of phosphorus from wastewater by combined technologies. Reviews in Environmental Science and Bio/Technology 2020, 19, 389 -418.
AMA StyleV. Carrillo, B. Fuentes, G. Gómez, Gladys Vidal. Characterization and recovery of phosphorus from wastewater by combined technologies. Reviews in Environmental Science and Bio/Technology. 2020; 19 (2):389-418.
Chicago/Turabian StyleV. Carrillo; B. Fuentes; G. Gómez; Gladys Vidal. 2020. "Characterization and recovery of phosphorus from wastewater by combined technologies." Reviews in Environmental Science and Bio/Technology 19, no. 2: 389-418.
Patricio Neumann; Zenón González; Gladys Vidal. Corrigendum to “Sequential ultrasound and low-temperature thermal pretreatment: Process optimization and influence on sewage sludge solubilization, enzyme activity and anaerobic digestion” [Bioresour. Technol. 234 (2017) 178–187]. Bioresource Technology 2020, 310, 123382 .
AMA StylePatricio Neumann, Zenón González, Gladys Vidal. Corrigendum to “Sequential ultrasound and low-temperature thermal pretreatment: Process optimization and influence on sewage sludge solubilization, enzyme activity and anaerobic digestion” [Bioresour. Technol. 234 (2017) 178–187]. Bioresource Technology. 2020; 310 ():123382.
Chicago/Turabian StylePatricio Neumann; Zenón González; Gladys Vidal. 2020. "Corrigendum to “Sequential ultrasound and low-temperature thermal pretreatment: Process optimization and influence on sewage sludge solubilization, enzyme activity and anaerobic digestion” [Bioresour. Technol. 234 (2017) 178–187]." Bioresource Technology 310, no. : 123382.
Constructed wetlands (CWs) are consolidated technologies used for removing organic matter (OM) and nutrients (nitrogen (N) and phosphorus (P)) from wastewater. Recently, these systems have been implemented for treating wastewater under saline conditions. In this context, the aim of this study was to evaluate the effect of wastewater with different levels of salinity, expressed as electrical conductivity (EC), on the removal efficiencies of OM and on the growth of vegetation planted in CW mesocosms. For this, five horizontal subsurface flow constructed wetlands (HSSFs) planted with Cyperus papyrus were operated under different salinity levels: 1 (CW-C), 2.5 (CW-2.5), 5 (CW-5), 7.5 (CW-7.5) and 10 mS/cm (CW-10) using CW-C as a control system. To analyze the effects of different salinity levels, the removal efficiencies of chemical oxygen demand (COD) and biological oxygen demand (BOD5) were evaluated. Moreover, the growth characteristics of Cyperus papyrus were compared in the different CWs through the determination of chlorophyll concentration and nutrient contents in different plant tissues. The results of this study showed that the removal efficiencies of OM were above 50%. Regarding the effect of salinity on the removal of contaminants, the COD and BOD5 removals decreased 18% and 31%, respectively, from CW-C to CW-10 (p < .05). The sodium (Na+) concentration in Cyperus papyrus increased 82% when the salinity increased from 1 (CW-C) to 10 mS/cm (CW-10). In contrast, the chlorophyll concentration decreased 17% with increasing salinity (from 1 to 10 mS/cm). Finally, the vegetation presented mechanisms of salt tolerance, mainly Na+ accumulation in plant tissues. Despite these results, the technology of CWs could be a feasible alternative for the treatment of saline wastewater improving the plant selection.
Rodrigo Sepúlveda; Ana María Leiva; Gladys Vidal. Performance of Cyperus papyrus in constructed wetland mesocosms under different levels of salinity. Ecological Engineering 2020, 151, 105820 .
AMA StyleRodrigo Sepúlveda, Ana María Leiva, Gladys Vidal. Performance of Cyperus papyrus in constructed wetland mesocosms under different levels of salinity. Ecological Engineering. 2020; 151 ():105820.
Chicago/Turabian StyleRodrigo Sepúlveda; Ana María Leiva; Gladys Vidal. 2020. "Performance of Cyperus papyrus in constructed wetland mesocosms under different levels of salinity." Ecological Engineering 151, no. : 105820.
The aim of this work was to determine the competencies that need to be included in engineering programs to develop water infrastructure based on Nature-Based Solutions (NBS) in the urban context, focused on its application in developing countries. Thus, the work was developed in three phases: i) a theoretical phase, ii) a validation phase and iii) a statistical analysis. For the theoretical phase, a literature review was conducted to determine a set of competencies for developing these type of projects. Next, in the validation phase, fifty participants were invited to complete a two-round Delphi questionnaire to rank the competencies detected in the literature review. The participants were classified according to their level of knowledge (skilled or expert) and place of work (countries with upper-middle-income or high-income). The results showed that twenty-one competencies were identified. In the validation phase, for the first Delphi round, the different groups studied (skilled vs expert; high-income vs upper-middle-income) did not agree about the most important competencies. However, after the second Delphi round, an agreement was achieved. Therefore, competencies related to water quality and process design for improving its quality were defined as “extremely important” competencies. In addition, the entire panel of experts also highlighted competencies related to legislation, circular economy, equipment, climate, and construction materials. Thus, for the first time, a set of competencies that needs to be included in educational programs for engineers with a special focus on developing water infrastructure based on NBS in the urban context of developing countries has been proposed in this work.
I. Vera-Puerto; H. Valdes; C. Correa; R. Agredano; G. Vidal; M. Belmonte; J. Olave; C. Arias. Proposal of competencies for engineering education to develop water infrastructure based on “Nature-Based Solutions” in the urban context. Journal of Cleaner Production 2020, 265, 121717 .
AMA StyleI. Vera-Puerto, H. Valdes, C. Correa, R. Agredano, G. Vidal, M. Belmonte, J. Olave, C. Arias. Proposal of competencies for engineering education to develop water infrastructure based on “Nature-Based Solutions” in the urban context. Journal of Cleaner Production. 2020; 265 ():121717.
Chicago/Turabian StyleI. Vera-Puerto; H. Valdes; C. Correa; R. Agredano; G. Vidal; M. Belmonte; J. Olave; C. Arias. 2020. "Proposal of competencies for engineering education to develop water infrastructure based on “Nature-Based Solutions” in the urban context." Journal of Cleaner Production 265, no. : 121717.
When partial nitritation-anammox (PN-AMX) processes are applied to treat the mainstream in wastewater treatment plants (WWTPs), it is difficult to fulfil the total nitrogen (TN) quality requirements established by the European Union (<10 g TN/m3). The operation of the anammox process was evaluated here in a continuous stirred tank reactor operated at 15 °C and fed with concentrations of 50 g TN/m3 (1.30 ± 0.23 g NO2−-N/g NH4+-N). Two different aspects were identified as crucial, limiting nitrogen removal efficiency. On the one hand, the oxygen transferred from the air in contact with the mixed liquor surface favoured the nitrite oxidation to nitrate (up to 75 %) and this nitrate, in addition to the amount produced from the anammox reaction itself, worsened the effluent quality. On the other hand, the mass transfer of ammonium and nitrite to be converted inside the anammox granules involves relatively large values of apparent affinity constants (kNH4+app: 0.50 g NH4+-N/m3; kNO2-app: 0.17 g NO2−-N/m3) that favour the presence of these nitrogen compounds in the produced effluent. The careful isolation of the reactor from air seeping and the fixation of right hydraulic and solids retention times are expected to help the maintenance of stability and effluent quality.
Claudia Díaz; Marisol Belmonte; José Luis Campos; Oscar Franchi; Martín Faúndez; Gladys Vidal; Lucía Argiz; Alba Pedrouso; Angeles Val del Rio; Anuska Mosquera-Corral. Limits of the anammox process in granular systems to remove nitrogen at low temperature and nitrogen concentration. Process Safety and Environmental Protection 2020, 138, 349 -355.
AMA StyleClaudia Díaz, Marisol Belmonte, José Luis Campos, Oscar Franchi, Martín Faúndez, Gladys Vidal, Lucía Argiz, Alba Pedrouso, Angeles Val del Rio, Anuska Mosquera-Corral. Limits of the anammox process in granular systems to remove nitrogen at low temperature and nitrogen concentration. Process Safety and Environmental Protection. 2020; 138 ():349-355.
Chicago/Turabian StyleClaudia Díaz; Marisol Belmonte; José Luis Campos; Oscar Franchi; Martín Faúndez; Gladys Vidal; Lucía Argiz; Alba Pedrouso; Angeles Val del Rio; Anuska Mosquera-Corral. 2020. "Limits of the anammox process in granular systems to remove nitrogen at low temperature and nitrogen concentration." Process Safety and Environmental Protection 138, no. : 349-355.
The aim of this study is to compare the removal of organic micropollutants (OMPs) in wastewater by activated sludge (AS) and constructed wetlands (CWs). This analysis was carried out in a wastewater treatment plant (WWTP) of a rural community where they implemented two technologies in parallel: AS and a pilot plant of horizontal subsurface flow (HSSF) constructed wetlands. In this case, these systems were fed by the same influent and the removal efficiencies of 14 OMPs, including analgesics/anti-inflammatories, anticonvulsants, stimulants, antifungals, fragrances, plasticizers, and transformation products, were evaluated in each system. Regarding the presence of OMPs in the wastewater, the concentrations of these compounds in the influent ranged from 0.16 to 7.75 µg/L. In general, the removal efficiencies achieved by the AS system were between 10%–95% higher than those values reported by HSSFs with values above 80% for naproxen, ibuprofen, diclofenac, caffeine, triclosan, methyl dihydrojasmonate, bisphenol-A, 2-hydroxyl ibuprofen, and carboxy ibuprofen (p < 0.05). This behavior can be related to the aerobic conditions that promote the AS system with oxidation-reduction potential (ORP) and dissolved oxygen (DO) values above −281 mV and 0.24 mg/L, respectively. However, the removal of galaxolide was greater in HSSF system than in AS with significant difference of 70% (p < 0.05). Despite these results, this study reveals that comparing both technologies, AS had the best removal performance of these OMPs studied.
Carolina Reyes Contreras; Daniela López; Ana M. Leiva; Carmen Domínguez; Josep M. Bayona; Gladys Vidal. Removal of Organic Micropollutants in Wastewater Treated by Activated Sludge and Constructed Wetlands: A Comparative Study. Water 2019, 11, 2515 .
AMA StyleCarolina Reyes Contreras, Daniela López, Ana M. Leiva, Carmen Domínguez, Josep M. Bayona, Gladys Vidal. Removal of Organic Micropollutants in Wastewater Treated by Activated Sludge and Constructed Wetlands: A Comparative Study. Water. 2019; 11 (12):2515.
Chicago/Turabian StyleCarolina Reyes Contreras; Daniela López; Ana M. Leiva; Carmen Domínguez; Josep M. Bayona; Gladys Vidal. 2019. "Removal of Organic Micropollutants in Wastewater Treated by Activated Sludge and Constructed Wetlands: A Comparative Study." Water 11, no. 12: 2515.
The objective of this research was to evaluate the fate of aromatic compounds and organic matter in pilot constructed wetlands (CW) treating Pinus radiata and Eucalyptus globulus sawmill industry leachate. Six lab-scale surface flow CW were built and fed in batches. Three CW were fed with P. radiata leachate, while the other three CW were fed with E. globulus leachate. Each group of three CW included two CW planted with Phragmites australis and one unplanted CW as control unit. A stable hydraulic retention time of seven days was maintained in each CW. The organic loading rate was gradually increased in three phases in the CW fed with P. radiata leachate (i.e., from 12 to 19 g COD/m2/day) and with E. globulus leachate (i.e., from 14 to 40 g COD/m2/day). The operation of the six CWs lasted 98 days. The CW treating P. radiata and E. globulus leachate had a similar performance. The highest performance was obtained by the unplanted CW (approximately 10–20% higher than the planted CW), without significant differences observed between the P. radiata and E. globulus leachate treatment, regarding the removal efficiencies of organic matter and total phenolic compounds. The planted systems were probably affected by the high concentrations of these compounds applied, which probably created a toxic environment hindering the microbial community growth.
C. Muñoz; G. Gómez; A.I. Stefanakis; C. Plaza De Los Reyes; I. Vera-Puerto; G. Vidal. Aromatic Compounds and Organic Matter Behavior in Pilot Constructed Wetlands Treating Pinus Radiata and Eucalyptus Globulus Sawmill Industry Leachate. Applied Sciences 2019, 9, 5046 .
AMA StyleC. Muñoz, G. Gómez, A.I. Stefanakis, C. Plaza De Los Reyes, I. Vera-Puerto, G. Vidal. Aromatic Compounds and Organic Matter Behavior in Pilot Constructed Wetlands Treating Pinus Radiata and Eucalyptus Globulus Sawmill Industry Leachate. Applied Sciences. 2019; 9 (23):5046.
Chicago/Turabian StyleC. Muñoz; G. Gómez; A.I. Stefanakis; C. Plaza De Los Reyes; I. Vera-Puerto; G. Vidal. 2019. "Aromatic Compounds and Organic Matter Behavior in Pilot Constructed Wetlands Treating Pinus Radiata and Eucalyptus Globulus Sawmill Industry Leachate." Applied Sciences 9, no. 23: 5046.
The use of constructed wetlands as a wastewater treatment system is a feasible solution for rural areas. However, these systems do not efficiently eliminate pathogenic microorganisms. Therefore, it is necessary to implement disinfection systems such as ultraviolet (UV) disinfection systems in constructed wetlands. To evaluate the behavior of a UV system, a pilot system of artificial wetlands connected to one such disinfection system was operated. The results show that when the total suspended solids (TSS) of the influent (already treated by the system of constructed wetlands) reached values of 26.7 mg/L, a reduction of 2.03 uLog in fecal coliforms was obtained. However, when the TSS increased to 34.7 mg/L, the reduction was only 0.33 uLog. In addition to the influence of the TSS on the fecal coliform reduction efficiency, there is a direct relationship between the transmittance and the sizes of the particles present in the influent. After UV treatment, the microorganisms showed a peak in photoreactivation of 27.8% at 4 h after irradiation with visible radiation, while under conditions of darkness, no reactivation was observed.
Yenifer González; Pablo Salgado; Gladys Vidal. Disinfection behavior of a UV-treated wastewater system using constructed wetlands and the rate of reactivation of pathogenic microorganisms. Water Science and Technology 2019, 80, 1870 -1879.
AMA StyleYenifer González, Pablo Salgado, Gladys Vidal. Disinfection behavior of a UV-treated wastewater system using constructed wetlands and the rate of reactivation of pathogenic microorganisms. Water Science and Technology. 2019; 80 (10):1870-1879.
Chicago/Turabian StyleYenifer González; Pablo Salgado; Gladys Vidal. 2019. "Disinfection behavior of a UV-treated wastewater system using constructed wetlands and the rate of reactivation of pathogenic microorganisms." Water Science and Technology 80, no. 10: 1870-1879.
The objective of this research was to evaluate the distribution of the molecular weights of the recalcitrant organic matter contained in kraft mill effluents and identify microbial consortia responsible for an anaerobic biodegradable fraction. As a result, the average removal efficiencies of chemical organic demand (COD) and biological oxygen demand (BOD5) during the entire period of operation were 28% and 53%, respectively. The non-biodegradable organic matter was detected at molecular weights less than 1000 Da. However, most of the organic matter was in the molecular weight fraction higher than 10000 Da with 32 ± 11.6% COD as well as color (42.3 ± 8.7%), total phenolic compounds (35.9 ± 7.9%) and adsorbable organic compounds (AOX) (13.0 ± 2.7%). Methanogenic acetoclastic archaea of the genera Methanomethylovorans and Methanosarcina were found in the surface and middle zones of the reactor. Moreover, Methanosaeta and Methanolinea were identified in the low zone of the reactor. In all zones of the reactor, Desulfomicrobium and Desulfovibrio were found to be the most dominant genera of sulfate-reducing bacteria (SRB).
Gloria Gómez; Miguel Salinas; Nathaly Ruiz-Tagle; Katherine Sossa; Gladys Vidal. Molecular weight distribution of the recalcitrant organic matter contained in kraft mill effluents and the identification of microbial consortia responsible for an anaerobic biodegradable fraction. Journal of Environmental Science and Health, Part A 2019, 55, 281 -291.
AMA StyleGloria Gómez, Miguel Salinas, Nathaly Ruiz-Tagle, Katherine Sossa, Gladys Vidal. Molecular weight distribution of the recalcitrant organic matter contained in kraft mill effluents and the identification of microbial consortia responsible for an anaerobic biodegradable fraction. Journal of Environmental Science and Health, Part A. 2019; 55 (3):281-291.
Chicago/Turabian StyleGloria Gómez; Miguel Salinas; Nathaly Ruiz-Tagle; Katherine Sossa; Gladys Vidal. 2019. "Molecular weight distribution of the recalcitrant organic matter contained in kraft mill effluents and the identification of microbial consortia responsible for an anaerobic biodegradable fraction." Journal of Environmental Science and Health, Part A 55, no. 3: 281-291.