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Joan Dosta
Department of Chemical Engineering and Analytical Chemistry, University of Barcelona, C/Martí i Franquès 1, 6th floor, 08028 Barcelona, Spain

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Journal article
Published: 15 August 2020 in Science of The Total Environment
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This research evaluated the performance of a lab-scale anaerobic membrane bioreactor (AnMBR) treating municipal sewage pre-concentrated by forward osmosis (FO). The organic loading rate (OLR) and sodium concentrations of the synthetic sewage stepwise increased from 0.3 to 2.0 g COD L−1 d−1 and from 0.28 to 2.30 g Na+ L−1 to simulate pre-concentration factors of 1, 2, 5 and 10. No major operational problems were observed during AnMBR operation, with COD removal efficiencies ranging between 90 and 96%. The methane yield progressively increased from 214 ± 79 to 322 ± 60 mL CH4 g−1 COD as the pre-concentration factor increased from 1 to 10. This was mainly attributed to the lower fraction of methane dissolved lost in the permeate at higher OLRs. Interestingly, at the highest pre-concentration factor (2.30 g Na+ L−1) the difference between the permeate and the digester soluble COD indicated that membrane biofilm also played a role in COD removal. Finally, a preliminary energy and economic analysis showed that, at a pre-concentration factor of 10, the AnMBR temperature could be increased 10 °C and achieve a positive net present value (NPV) of 4 M € for a newly constructed AnMBR treating 10,000 m3 d−1 of pre-concentrated sewage with an AnMBR lifetime of 20 years.

ACS Style

Sergi Vinardell; Sergi Astals; Marta Jaramillo; Joan Mata-Alvarez; Joan Dosta. Anaerobic membrane bioreactor performance at different wastewater pre-concentration factors: An experimental and economic study. Science of The Total Environment 2020, 750, 141625 .

AMA Style

Sergi Vinardell, Sergi Astals, Marta Jaramillo, Joan Mata-Alvarez, Joan Dosta. Anaerobic membrane bioreactor performance at different wastewater pre-concentration factors: An experimental and economic study. Science of The Total Environment. 2020; 750 ():141625.

Chicago/Turabian Style

Sergi Vinardell; Sergi Astals; Marta Jaramillo; Joan Mata-Alvarez; Joan Dosta. 2020. "Anaerobic membrane bioreactor performance at different wastewater pre-concentration factors: An experimental and economic study." Science of The Total Environment 750, no. : 141625.

Journal article
Published: 11 June 2020 in Renewable and Sustainable Energy Reviews
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The application of anaerobic membrane bioreactors (AnMBR) for mainstream municipal sewage treatment is almost ready for full-scale implementation. However, some challenges still need to be addressed to make AnMBR technically and economically feasible. This article presents an updated review of five challenges that currently hinder the implementation of AnMBR technology for mainstream sewage treatment: (i) membrane fouling, (ii) process configuration, (iii) process temperature, (iv) sewage sulphate concentration, and (v) sewage low organics concentration. The gel layer appears to be the main responsible for membrane fouling and flux decline being molecules size and morphology critical properties for its formation. The review also discusses the advantages and disadvantages of five novel AnMBR configurations aiming to optimise fouling control. These include the integration of membrane technology with CSTR or upflow digesters, and the utilisation of scouring particles. Psychrophilic temperatures and high sulphate concentrations are two other limiting factors due to their impact on methane yields and membrane performance. Besides the methane dissolved in the effluent and the competition for organic matter between sulphate reducing bacteria and methanogens, the review examines the impact of temperature on microbial kinetics and community, and their combined effect on AnMBR performance. Finally, the review evaluates the possibility to pre-concentrate municipal sewage by forward osmosis. Sewage pre-concentration is an opportunity to reduce the volumetric flow rate and the dissolved methane losses. Overall, the resolution of these challenges requires a compromise solution considering membrane filtration, anaerobic digestion performance and economic feasibility.

ACS Style

Sergi Vinardell; S. Astals; M. Peces; M.A. Cardete; I. Fernández; J. Mata-Alvarez; J. Dosta. Advances in anaerobic membrane bioreactor technology for municipal wastewater treatment: A 2020 updated review. Renewable and Sustainable Energy Reviews 2020, 130, 109936 .

AMA Style

Sergi Vinardell, S. Astals, M. Peces, M.A. Cardete, I. Fernández, J. Mata-Alvarez, J. Dosta. Advances in anaerobic membrane bioreactor technology for municipal wastewater treatment: A 2020 updated review. Renewable and Sustainable Energy Reviews. 2020; 130 ():109936.

Chicago/Turabian Style

Sergi Vinardell; S. Astals; M. Peces; M.A. Cardete; I. Fernández; J. Mata-Alvarez; J. Dosta. 2020. "Advances in anaerobic membrane bioreactor technology for municipal wastewater treatment: A 2020 updated review." Renewable and Sustainable Energy Reviews 130, no. : 109936.

Journal article
Published: 11 November 2019 in Bioresource Technology
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The economic feasibility of combining forward osmosis (FO), reverse osmosis (RO) and anaerobic membrane bioreactor (AnMBR) technologies for municipal wastewater treatment with energy and water production was analysed. FO was used to pre-concentrate the AnMBR influent, RO for draw solution regeneration and water production, and AnMBR for wastewater treatment and energy production. The minimum wastewater treatment cost was estimated at 0.81 € m−3, achieved when limiting the FO recovery to 50% in a closed-loop scheme. However, the cost increased to 1.01 and 1.27 € m−3 for FO recoveries of 80% and 90%, respectively. The fresh water production cost was estimated at 0.80 and 1.16 € m−3 for an open-loop scheme maximising water production and a closed-loop scheme, respectively. The low FO membrane fluxes were identified as a limiting factor and a sensitivity analysis revealed that FO membrane fluxes of 10 LMH would significantly improve the competitiveness of FO-RO + AnMBR technology.

ACS Style

Sergi Vinardell; Sergi Astals; Joan Mata-Alvarez; Joan Dosta. Techno-economic analysis of combining forward osmosis-reverse osmosis and anaerobic membrane bioreactor technologies for municipal wastewater treatment and water production. Bioresource Technology 2019, 297, 122395 .

AMA Style

Sergi Vinardell, Sergi Astals, Joan Mata-Alvarez, Joan Dosta. Techno-economic analysis of combining forward osmosis-reverse osmosis and anaerobic membrane bioreactor technologies for municipal wastewater treatment and water production. Bioresource Technology. 2019; 297 ():122395.

Chicago/Turabian Style

Sergi Vinardell; Sergi Astals; Joan Mata-Alvarez; Joan Dosta. 2019. "Techno-economic analysis of combining forward osmosis-reverse osmosis and anaerobic membrane bioreactor technologies for municipal wastewater treatment and water production." Bioresource Technology 297, no. : 122395.

Journal article
Published: 17 August 2019 in Molecules
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Food waste (FW) collected from a university canteen was treated in acidogenic fermenters to produce volatile fatty acids (VFA) under biological pretreatment with mature compost. Batch assays working at pH 6 revealed an increment of 9.0%, 7.9%, and 4.1% (on COD basis) of VFA concentration when adding 2.5%, 3.5%, and 4.5% w/w of mature compost, respectively, even though the volatile solids (VS) concentration of food waste was lower in the tests with increasing doses of mature compost. For batch tests at pH 7, this VFA generation improvement was lower, even though enhanced COD solubilization was recorded. Operating in semi-continuous conditions at 35 °C, pH of 6, and hydraulic retention time (HRT) of 3.5 days, the addition of 2.5% w/w of mature compost led to a VFA concentration up to 51.2 ± 12.3% more (on VS basis) when compared to a reference reactor without compost addition. Moreover, the percentage of butyric acid on VS basis in the fermentation broth working at a pH of 6 increased from up to 12.2 ± 1.9% (0% compost addition) to up to 23.5 ± 2.7% (2.5% compost addition). The VFA production was not improved when a higher percentage of mature compost was used (3.5% instead of 2.5% w/w), and it slightly decreased when mature compost addition was lowered to 1.5% w/w. When working at a pH of 7 in the semi-continuous fermenters with the addition of 2.5% w/w mature compost at an HRT of 3.5 days, an improvement of 79% and 104% of the VFA concentration (on VS basis) were recorded as compared to fermenters working at a pH of 6 with 2.5% and 0% w/w of mature compost addition, respectively. At a pH of 7, higher production of propionic and valeric acids was found with respect to the reactor working at a pH of 6. The effect of pH on VFA generation was estimated to have greater contribution than that of only biological pretreatment using mature compost. At a pH of 7, the VFA yield was higher for the fermenter working with 2.5% w/w mature compost but at a pH of 7 and HRT of 5 days, the effect of mature compost on VFA production improvement was lower than that obtained at a pH of 6. Moreover, higher solubilization in terms of soluble chemical oxygen demand and total ammonium was detected when biological pretreatment using mature compost was applied at both a pH of 6 and a pH of 7, which indicates enhanced hydrolysis in both conditions.

ACS Style

Yen-Keong Cheah; Joan Dosta; Joan Mata-Álvarez. Enhancement of Volatile Fatty Acids Production from Food Waste by Mature Compost Addition. Molecules 2019, 24, 2986 .

AMA Style

Yen-Keong Cheah, Joan Dosta, Joan Mata-Álvarez. Enhancement of Volatile Fatty Acids Production from Food Waste by Mature Compost Addition. Molecules. 2019; 24 (16):2986.

Chicago/Turabian Style

Yen-Keong Cheah; Joan Dosta; Joan Mata-Álvarez. 2019. "Enhancement of Volatile Fatty Acids Production from Food Waste by Mature Compost Addition." Molecules 24, no. 16: 2986.

Journal article
Published: 20 May 2019 in Environmental Science and Pollution Research
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This study is focused on the effects of pH on the production of volatile fatty acids (VFAs) and their distribution through the acidogenic fermentation of source-sorted organic fraction of municipal solid waste (OFMSW) from a mechanical-biological treatment (MBT) plant, and food waste (FW) from a university canteen. In semi-continuous lab-scale digesters using OFMSW at a hydraulic retention time (HRT) of 3.5 days under acidic conditions (pH 6.0), the VFA concentration in the effluent increased to 9.8–11.5 g L−1 (VS content of the feedstock between 4.2 and 5.2% w/w), while its individual VFA profiling was similar to the influent which was already pre-fermented (namely, C2 35–41%, C3 18–22%, C4 17–21%, and C5 9–12%). When working with the same conditions but using FW as feedstock, an effluent with a VFA concentration up to 11.5 g VFA L−1 (FW with a VS content of 5.5% w/w) and a stable distribution of C2 and C4 acids (up to 60.3% and 12.9%, respectively) but with very low quantities of C3 and C5 acids (lower than 1.8 and 2.7%, respectively) was obtained. Anaerobic batch tests using FW revealed that alkaline pH near 9 could lead to higher VFA production with high acetic acid content when compared to pH 6. In the semi-continuous fermenters working at alkaline conditions (pH 9.5–10) using OFMSW and FW, an enhanced solubilization of organic matter was registered with respect to the fermenters working under acidic conditions. This fact was not reflected in a higher VFA production when using OFMSW as feedstock, probably due to free ammonia inhibition, since OFMSW was mixed in the MBT plant with supernatant from anaerobic digestion of this biowaste. However, when using FW, alkaline conditions lead to an enhanced VFA production with respect to the reactor working under acidic conditions, being acetic acid the predominant product, which represented up to 91% of the VFA spectrum obtained.

ACS Style

Yen-Keong Cheah; Carme Vidal-Antich; Joan Dosta; Joan Mata-Álvarez. Volatile fatty acid production from mesophilic acidogenic fermentation of organic fraction of municipal solid waste and food waste under acidic and alkaline pH. Environmental Science and Pollution Research 2019, 26, 35509 -35522.

AMA Style

Yen-Keong Cheah, Carme Vidal-Antich, Joan Dosta, Joan Mata-Álvarez. Volatile fatty acid production from mesophilic acidogenic fermentation of organic fraction of municipal solid waste and food waste under acidic and alkaline pH. Environmental Science and Pollution Research. 2019; 26 (35):35509-35522.

Chicago/Turabian Style

Yen-Keong Cheah; Carme Vidal-Antich; Joan Dosta; Joan Mata-Álvarez. 2019. "Volatile fatty acid production from mesophilic acidogenic fermentation of organic fraction of municipal solid waste and food waste under acidic and alkaline pH." Environmental Science and Pollution Research 26, no. 35: 35509-35522.

Journal article
Published: 06 February 2019 in Journal of Environmental Chemical Engineering
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The operational conditions of petrochemical, aerobic activated sludge systems focused on organic matter removal often lead to the unintended proliferation of nitrifying bacteria. Consequently, undesired denitrification occurs in the clarifier, difficulting the accomplishment of each time more stringent emission levels. The addition of folic acid to limit nitrification is presented as an advantageous alternative, due to its low investment cost and easy implementation. To assess the effectiveness of folic acid for this purpose, cost-effective concentrations of 0.4 and 0.9 mg g-1 VSS day-1 have been supplemented to respective bench-scale, petrochemical bioreactors in comparison to a control. Eventually, the addition was interrupted to observe lasting effects. Based on Vibrio Fischeri assay, the folic acid concentrations tested did not add significant toxicity to the effluent. The supply of the lower vitamin concentration provided satisfactory results regarding to nitrification reduction (93.6%) and improvement of the sludge volumetric index compared to control (17.4 in front of 67.3 mL g-1). However, its feasibility is conditioned to the availability of spare aeration capacity, since oxygen demand increased in a 85.7%, probably due to an older sludge age (71.4% reduction in observed sludge yield). Reductions up to 97.1% in nitrification rates were obtained during and 60 days after the dosage of the higher vitamin concentration. Despite other advantages, such as increasing the organic matter removal efficiency (60.0%) and reducing oxygen demand (14.7%) relative to control, the high dosed reactor exhibited a worse sludge settling (93.1 mL g-1) and more sludge production (57.1% increase in observed sludge yield).

ACS Style

M.A. Cardete; J. Mata-Álvarez; Joan Dosta; R. Nieto-Sánchez. Biological nitrification control by addition of folic acid in a petrochemical wastewater treatment focused on organic matter removal. Journal of Environmental Chemical Engineering 2019, 7, 102935 .

AMA Style

M.A. Cardete, J. Mata-Álvarez, Joan Dosta, R. Nieto-Sánchez. Biological nitrification control by addition of folic acid in a petrochemical wastewater treatment focused on organic matter removal. Journal of Environmental Chemical Engineering. 2019; 7 (2):102935.

Chicago/Turabian Style

M.A. Cardete; J. Mata-Álvarez; Joan Dosta; R. Nieto-Sánchez. 2019. "Biological nitrification control by addition of folic acid in a petrochemical wastewater treatment focused on organic matter removal." Journal of Environmental Chemical Engineering 7, no. 2: 102935.

Journal article
Published: 01 July 2018 in Science of The Total Environment
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The use of low-cost inorganic sorbents as a new sustainable strategy to enhance the valorization of nutrients (N-P-K), from the urban water cycle (e.g., side streams from sewage sludge anaerobic digestion), in agriculture applications is presented. The simultaneous recovery and stabilization of ammonium and phosphate by using a mixture of two reactive sorbents (Na and K zeolites and magnesium oxide) was evaluated. The nutrients stabilization process, favoured at alkaline pH values, is carried out by a) the precipitation of phosphate ions with magnesium and/or ammonium ions and b) the sorption of ammonium by Na- and K-zeolites. MgO(s) promoted the stabilization of phosphate as bobierrite (Mg(PO)(s)) or struvite (MgNHPO(s)) depending on the applied dose. Doses with the stoichiometric molar ratio of Mg/P promote the formation of bobierrite, while molar ratios higher than 3 favour the formation of struvite. Na zeolites (NaP1-NA, NaP1-IQE) demonstrated efficiency on ammonium stabilization between 60±2 (for 15gZ/L) to 90±3% (for 50gZ/L). The ammonium recovery efficiency is limited by the zeolite sorption capacity. If the target of the fertilizing criteria should include K, then the use of a K-zeolite (e.g., 5AH-IQE) provides a good solution. The optimum pH for the precipitation of struvite and bobierrite is 9.5 and the optimum pH for ammonium removal is between 4 and 8.5. N is present in higher concentrations (up 0.7-1gNH/L) when pH is ranged between 8.2 and 8.6. The ammonium recovery ratios were better than those previously reported using only magnesium oxide or even a more expensive reagent as newberrite (MgHPO(s)). The recovery mechanisms described generate low-solubility stabilized nutrients forms that potentially can be applied as slow-release fertilizers in agriculture. Thus, the use in agriculture of blends of digested sludge with low-solubility stabilized nutrients forms will improve soils quality properties in terms of organic matter and nutrients availability.

ACS Style

Mehrez Hermassi; Joan Dosta; C. Valderrama; E. Licon; N. Moreno; Xavier Querol; N.H. Batis; Jose Luis Cortina. Simultaneous ammonium and phosphate recovery and stabilization from urban sewage sludge anaerobic digestates using reactive sorbents. Science of The Total Environment 2018, 630, 781 -789.

AMA Style

Mehrez Hermassi, Joan Dosta, C. Valderrama, E. Licon, N. Moreno, Xavier Querol, N.H. Batis, Jose Luis Cortina. Simultaneous ammonium and phosphate recovery and stabilization from urban sewage sludge anaerobic digestates using reactive sorbents. Science of The Total Environment. 2018; 630 ():781-789.

Chicago/Turabian Style

Mehrez Hermassi; Joan Dosta; C. Valderrama; E. Licon; N. Moreno; Xavier Querol; N.H. Batis; Jose Luis Cortina. 2018. "Simultaneous ammonium and phosphate recovery and stabilization from urban sewage sludge anaerobic digestates using reactive sorbents." Science of The Total Environment 630, no. : 781-789.

Original paper
Published: 18 April 2018 in Waste and Biomass Valorization
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This study is focused on the anaerobic biological treatment of a polyethylene glycol (PEG)-rich industrial wastewater and mechanically sorted organic fraction of municipal solid wastes, called residual organic matter (ROM), in order to assess the effects of mixing these substrates to produce volatile fatty acids (VFA) through anaerobic co-fermentation or biogas through anaerobic co-digestion. As a consequence of the anaerobic co-digestion of PEG and ROM (PEG representing a 3.5% v/v), the specific methane production (SMP) reached 0.44 Nm3 CH4 kg−1 volatile solids (VS) in front of 0.30 Nm3 CH4 kg−1 VS of the anaerobic digestion (AD) control reactor, with just a 35% higher organic loading rate (OLR) on VS basis. The fast degradation of PEG implied that effluent quality was nearly the same of AD process, showing high stability with neither increase of VS nor significant variations in nutrients. Acidogenic fermentation was carried out in batch tests for several mixtures of PEG industrial wastewater and ROM, where the percentages of PEG-rich wastewater on VS basis were 0, 12.5, 25, 37.5 and 50%. The best results of VFA increase per unit of VS of co-substrate fed was obtained for the mixture with 12.5% of PEG wastewater at 5 days retention time. The same mixture was fed in an anaerobic fermenter under mesophilic conditions treating ROM at an HRT of 3.5 days and without modifying the OLR (VS basis). As a consequence of this co-fermentation, the production of VFA was increased by 14% (12.1 g VFA L−1) when compared with the values obtained in mono-fermentation. Moreover, the percentages of acetic acid + propionic acid (66.5%) was in the range than that obtained with mono-fermentation of ROM (64.6%).

ACS Style

J. Dosta; A. Martin-Ryals; M. Garrigo; V. Ortiz-Roca; I. Fernández; R. Torres-Castillo; J. Mata-Álvarez. Acidogenic Fermentation and Anaerobic Co-digestion of Mechanically Sorted OFMSW and Polyethylene Glycol. Waste and Biomass Valorization 2018, 9, 2319 -2326.

AMA Style

J. Dosta, A. Martin-Ryals, M. Garrigo, V. Ortiz-Roca, I. Fernández, R. Torres-Castillo, J. Mata-Álvarez. Acidogenic Fermentation and Anaerobic Co-digestion of Mechanically Sorted OFMSW and Polyethylene Glycol. Waste and Biomass Valorization. 2018; 9 (12):2319-2326.

Chicago/Turabian Style

J. Dosta; A. Martin-Ryals; M. Garrigo; V. Ortiz-Roca; I. Fernández; R. Torres-Castillo; J. Mata-Álvarez. 2018. "Acidogenic Fermentation and Anaerobic Co-digestion of Mechanically Sorted OFMSW and Polyethylene Glycol." Waste and Biomass Valorization 9, no. 12: 2319-2326.

Journal article
Published: 01 February 2018 in Journal of Environmental Chemical Engineering
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Sludge settling is determined by the biomass quality, which in turn is dependent on the mixed liquor parameters. In order to assess their effect on SVI in an activated sludge system including an aerobic selector, experimental design arrangements were organized in a pilot-scale installation fed with petrochemical wastewater. Experiments on a CSTR revealed that while increasing DO (from 2 mg L−1) and while reducing SRT (from >22 to <19 days), sludge settling presented a statistically significant improvement. When the aerobic selector was included in the activated sludge system, DO above 2 mg L−1 was the only requirement in the reactor to obtain SVI below 100 mL g−1. The critical parameters became those of the selector, where the flocculant biomass was formed, while degrading almost completely the BOD5. Despite the better quality of the biomass obtained with the selector, bench-scale, short-term experiments demonstrated that gravity settling principles, bioflocculation and water properties still played a significant role on sludge settling. With an increase in MLSS concentration (from 2.3 to 16 mg L−1) or in conductivity (from 20 to 60 mS cm−1), sludge settling was significantly worse. Increasing pH (from 8.0 to 9.0) or temperature (from 30 to 38 °C) enhanced sludge settling. Measurements of the sludge electrical particle charge with a Mütek system indicated an optimum value to obtain the minimum SVI, which could be attained by the addition of coagulants.

ACS Style

M.A. Cardete; J. Mata-Álvarez; J. Dosta; R. Nieto-Sánchez. Effect of the mixed liquor parameters on sludge settling for a petrochemical activated sludge system including an aerobic selector. Journal of Environmental Chemical Engineering 2018, 6, 1062 -1071.

AMA Style

M.A. Cardete, J. Mata-Álvarez, J. Dosta, R. Nieto-Sánchez. Effect of the mixed liquor parameters on sludge settling for a petrochemical activated sludge system including an aerobic selector. Journal of Environmental Chemical Engineering. 2018; 6 (1):1062-1071.

Chicago/Turabian Style

M.A. Cardete; J. Mata-Álvarez; J. Dosta; R. Nieto-Sánchez. 2018. "Effect of the mixed liquor parameters on sludge settling for a petrochemical activated sludge system including an aerobic selector." Journal of Environmental Chemical Engineering 6, no. 1: 1062-1071.

Journal article
Published: 01 October 2017 in Journal of Environmental Chemical Engineering
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ACS Style

M.A. Cardete; J. Mata-Álvarez; J. Dosta; R. Nieto-Sánchez. Influence of hydraulic retention time, food-to-microorganism ratio and influent biodegradability on the performance of an aerobic selector treating petrochemical wastewater. Journal of Environmental Chemical Engineering 2017, 5, 5033 -5042.

AMA Style

M.A. Cardete, J. Mata-Álvarez, J. Dosta, R. Nieto-Sánchez. Influence of hydraulic retention time, food-to-microorganism ratio and influent biodegradability on the performance of an aerobic selector treating petrochemical wastewater. Journal of Environmental Chemical Engineering. 2017; 5 (5):5033-5042.

Chicago/Turabian Style

M.A. Cardete; J. Mata-Álvarez; J. Dosta; R. Nieto-Sánchez. 2017. "Influence of hydraulic retention time, food-to-microorganism ratio and influent biodegradability on the performance of an aerobic selector treating petrochemical wastewater." Journal of Environmental Chemical Engineering 5, no. 5: 5033-5042.

Journal article
Published: 01 August 2017 in Journal of Environmental Chemical Engineering
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ACS Style

M.A. Cardete; J. Mata-Álvarez; J. Dosta; R. Nieto-Sánchez. Sludge settling enhancement in a pilot scale activated sludge process treating petrochemical wastewater by implementing aerobic or anoxic selectors. Journal of Environmental Chemical Engineering 2017, 5, 3472 -3482.

AMA Style

M.A. Cardete, J. Mata-Álvarez, J. Dosta, R. Nieto-Sánchez. Sludge settling enhancement in a pilot scale activated sludge process treating petrochemical wastewater by implementing aerobic or anoxic selectors. Journal of Environmental Chemical Engineering. 2017; 5 (4):3472-3482.

Chicago/Turabian Style

M.A. Cardete; J. Mata-Álvarez; J. Dosta; R. Nieto-Sánchez. 2017. "Sludge settling enhancement in a pilot scale activated sludge process treating petrochemical wastewater by implementing aerobic or anoxic selectors." Journal of Environmental Chemical Engineering 5, no. 4: 3472-3482.

Article
Published: 12 April 2017 in Water, Air, & Soil Pollution
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The deammonification process represents one of the most convenient pathways for nitrogen removal from wastewater. A great deal of scientific articles dwells on the treatment of sidestream fluxes, whereas applications to mainstream waters represent a novel field. Among the general challenges of deammonification, one of the most important is the effective selection of ammonia oxidizers (AOB) over nitrite oxidizers (NOB), but also the typical slow start-up periods. In addition to such issues, mainstream deammonification has to face water temperatures and alkalinity reserves lower than those of sidestream fluxes and higher content of organic matter. An attempt was made to tackle such challenges by employing a lab-scale plant; low dissolved oxygen (DO) values (average 0.78 mg/L) and granular AOB-enriched biomass were used in order to address exclusion of nitrite oxidizers. The granules also allowed better biomass retention. The hydraulic retention time (HRT) was established initially at 24 h and later decreased to 12 h, as to possibly enhance the performance of the reactor. After 52 days of operation, Anammox biomass was also inoculated to the reactor. The results showed a maximum nitrogen removal efficiency of 54%. Moreover, little quantities of nitrates were observed throughout the experiment (<5 mg N/L twice, under the limit of quantification the rest of the sampling days), meaning that NOB out-selection techniques worked properly. Retention of biomass was also positively addressed and yielded a final SRT value of 15.6 days. Therefore, the proposed solution for mainstream deammonification was demonstrated to be promising and more research would be necessary to optimize it.

ACS Style

M. Salmistraro; I. Fernández; Joan Dosta; E. Plaza; J. Mata. Mainstream Deammonification: Preliminary Experience Employing Granular AOB-Enriched Biomass at Low DO Values. Water, Air, & Soil Pollution 2017, 228, 178 .

AMA Style

M. Salmistraro, I. Fernández, Joan Dosta, E. Plaza, J. Mata. Mainstream Deammonification: Preliminary Experience Employing Granular AOB-Enriched Biomass at Low DO Values. Water, Air, & Soil Pollution. 2017; 228 (5):178.

Chicago/Turabian Style

M. Salmistraro; I. Fernández; Joan Dosta; E. Plaza; J. Mata. 2017. "Mainstream Deammonification: Preliminary Experience Employing Granular AOB-Enriched Biomass at Low DO Values." Water, Air, & Soil Pollution 228, no. 5: 178.

Journal article
Published: 01 October 2016 in Waste Management
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Mechanical-biological treatment plants treat municipal solid waste to recover recyclable materials, nutrients and energy. Waste paper and cardboard (WP), the second main compound in municipal solid waste (∼30% in weight basis), is typically used for biogas generation. However, its recovery is gaining attention as it can be used to produce add-value products like bioethanol and residual derived fuel. Nevertheless, WP suppression or replacement will impact anaerobic digestion in terms of biogas production, process stability and digestate management. Two lab-scale reactors were used to assess the impact of WP in anaerobic digestion performance. A control reactor was only fed with biowaste (BioW), while a second reactor was fed with two different mixtures of BioW and WP, i.e. 85/15% and 70/30% (weight basis). Results indicate that either replacing half of the WP by BioW or removing half of the WP has little impact on the methane production. When removing half of the WP, methane production could be sustained by a larger waste biodegradability. The replacement of all WP by BioW increased the reactor methane production (∼37%), while removing all WP would have reduced the methane production about 15%. Finally, replacing WP loading rate by BioW led to a system less tolerant to instability periods and with poorer digestate quality.

ACS Style

X. Fonoll; Sergi Astals; J. Dosta; J. Mata-Alvarez. Impact of paper and cardboard suppression on OFMSW anaerobic digestion. Waste Management 2016, 56, 100 -105.

AMA Style

X. Fonoll, Sergi Astals, J. Dosta, J. Mata-Alvarez. Impact of paper and cardboard suppression on OFMSW anaerobic digestion. Waste Management. 2016; 56 ():100-105.

Chicago/Turabian Style

X. Fonoll; Sergi Astals; J. Dosta; J. Mata-Alvarez. 2016. "Impact of paper and cardboard suppression on OFMSW anaerobic digestion." Waste Management 56, no. : 100-105.

Journal article
Published: 01 January 2016 in Chemical Engineering Journal
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ACS Style

Mehrez Hermassi; C. Valderrama; Joan Dosta; Jose Luis Cortina; N.H. Batis. Detrimental effects of magnesium (II) on hydroxyapatite precipitation from synthetic industrial brines. Chemical Engineering Journal 2016, 283, 572 -581.

AMA Style

Mehrez Hermassi, C. Valderrama, Joan Dosta, Jose Luis Cortina, N.H. Batis. Detrimental effects of magnesium (II) on hydroxyapatite precipitation from synthetic industrial brines. Chemical Engineering Journal. 2016; 283 ():572-581.

Chicago/Turabian Style

Mehrez Hermassi; C. Valderrama; Joan Dosta; Jose Luis Cortina; N.H. Batis. 2016. "Detrimental effects of magnesium (II) on hydroxyapatite precipitation from synthetic industrial brines." Chemical Engineering Journal 283, no. : 572-581.

Journal article
Published: 01 January 2016 in Ecological Engineering
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ACS Style

Núria Basset; Eric Santos; Joan Dosta; Joan Mata-Álvarez. Start-up and operation of an AnMBR for winery wastewater treatment. Ecological Engineering 2016, 86, 279 -289.

AMA Style

Núria Basset, Eric Santos, Joan Dosta, Joan Mata-Álvarez. Start-up and operation of an AnMBR for winery wastewater treatment. Ecological Engineering. 2016; 86 ():279-289.

Chicago/Turabian Style

Núria Basset; Eric Santos; Joan Dosta; Joan Mata-Álvarez. 2016. "Start-up and operation of an AnMBR for winery wastewater treatment." Ecological Engineering 86, no. : 279-289.

Journal article
Published: 01 December 2015 in Journal of Environmental Management
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A two-stage Partial Nitritation (PN)/Anammox process was carried out at lab-scale conditions to treat reject water from a municipal WWTP. PN was achieved in a granular SBR obtaining an effluent with a NH4+–N/NO2−–N molar ratio around 1.0. The microbial characterization of this reactor revealed a predominance of Betaproteobacteria, with a member of Nitrosomonas as the main autotrophic ammonium oxidizing bacterium (AOB). Nitrite oxidizing bacteria (NOB) were under the detection limit of 16S rRNA gene pyrosequencing, indicating their effective inhibition. The effluent of the PN reactor was fed to an Anammox SBR where stable operation was achieved with a NH4+–N:NO2−–N:NO3−–N stoichiometry of 1:1.25:0.14. The deviation to the theoretical stoichiometry could be attributed to the presence of heterotrophic biomass in the Anammox reactor (mainly members of Chlorobi and Chloroflexi). Planctomycetes accounted for 7% of the global community, being members of Brocadia (1.4% of the total abundance) the main anaerobic ammonium oxidizer detected.

ACS Style

J. Dosta; Joaquim Vila; I. Sancho; N. Basset; Magdalena Grifoll; J. Mata-Álvarez. Two-step partial nitritation/Anammox process in granulation reactors: Start-up operation and microbial characterization. Journal of Environmental Management 2015, 164, 196 -205.

AMA Style

J. Dosta, Joaquim Vila, I. Sancho, N. Basset, Magdalena Grifoll, J. Mata-Álvarez. Two-step partial nitritation/Anammox process in granulation reactors: Start-up operation and microbial characterization. Journal of Environmental Management. 2015; 164 ():196-205.

Chicago/Turabian Style

J. Dosta; Joaquim Vila; I. Sancho; N. Basset; Magdalena Grifoll; J. Mata-Álvarez. 2015. "Two-step partial nitritation/Anammox process in granulation reactors: Start-up operation and microbial characterization." Journal of Environmental Management 164, no. : 196-205.

Journal article
Published: 23 October 2015 in Bioresource Technology
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A novel scheme was developed for the treatment of municipal wastewater integrating nitritation/denitritation with the selection of polyhydroxyalkanoates (PHA) storing biomass under an aerobic/anoxic, feast/famine regime. The process took place in a sequencing batch reactor (SBR) and the subsequent PHA accumulation in a batch reactor. The carbon source added during the selection and accumulation steps consisted of fermentation liquid from the organic fraction of municipal solids waste (OFMSW FL) (Period I) and OFMSW and primary sludge fermentation liquid (Period II). Selection of PHA storing biomass was successful and denitritation was driven by internally stored PHA during the famine phase. Under optimum conditions of SBR operation ammonia removal was 93%, reaching a maximum nitrite removal of 98%. The treated effluent met the nitrogen limits, while PHA-storing biomass was successfully selected. The maximum accumulation of PHA was 10.6% (wt.) since the nutrients present in the carbon source promoted bacterial growth.

ACS Style

N. Basset; E. Katsou; Nicola Frison; S. Malamis; Joan Dosta; Francesco Fatone. Integrating the selection of PHA storing biomass and nitrogen removal via nitrite in the main wastewater treatment line. Bioresource Technology 2015, 200, 820 -829.

AMA Style

N. Basset, E. Katsou, Nicola Frison, S. Malamis, Joan Dosta, Francesco Fatone. Integrating the selection of PHA storing biomass and nitrogen removal via nitrite in the main wastewater treatment line. Bioresource Technology. 2015; 200 ():820-829.

Chicago/Turabian Style

N. Basset; E. Katsou; Nicola Frison; S. Malamis; Joan Dosta; Francesco Fatone. 2015. "Integrating the selection of PHA storing biomass and nitrogen removal via nitrite in the main wastewater treatment line." Bioresource Technology 200, no. : 820-829.

Journal article
Published: 01 May 2015 in Chemical Engineering Journal
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In this work, phosphorous recovery as hydroxyapatite (Ca5(PO4)3OH(s) = Hap) from alkaline phosphate concentrates (0.25–1 g P–PO43-/L) using calcium chloride (6 g/L) in a batch reactor was evaluated. Ca(II) solutions was continuously fed (0.1–0.3 mL/min) up to reaching a Ca/P ratio of ~1.67 (5/3) to promote Hap formation. Hap powders were characterized by structural form (using X-ray diffraction (XRD), laser light scattering (LS) and Fourier transform infrared spectroscopy (FTIR)); textural form (using Field Emission Scanning Electron Microscopy with Energy Dispersive System (FE-SEM/EDS) and Brunauer–Emmett–Teller (BET)) and thermally (using Thermogravimetric Analysis (TGA)/Differential Thermal Analysis (DTA)). When pH was kept constant in alkaline values (from 8 to 11.5), Hap precipitation efficiency was improved. At pH 11.5, higher phosphorous precipitation rate was registered compared to that obtained for pH 8 and 10, but lower degree of crystallinity was observed in the Hap powders. The increase of the total initial phosphate concentration lead to the formation of Hap powders with higher degree of crystallinity and crystal diameter, but also lower mean particle size. As Ca(II) dosing rate increased Hap precipitation rate was higher, and also the mean size and degree of crystallinity of the prepared particles increasedPostprint (author’s final draft

ACS Style

Mehrez Hermassi; C. Valderrama; Joan Dosta; Jose Luis Cortina; N.H. Batis. Evaluation of hydroxyapatite crystallization in a batch reactor for the valorization of alkaline phosphate concentrates from wastewater treatment plants using calcium chloride. Chemical Engineering Journal 2015, 267, 142 -152.

AMA Style

Mehrez Hermassi, C. Valderrama, Joan Dosta, Jose Luis Cortina, N.H. Batis. Evaluation of hydroxyapatite crystallization in a batch reactor for the valorization of alkaline phosphate concentrates from wastewater treatment plants using calcium chloride. Chemical Engineering Journal. 2015; 267 ():142-152.

Chicago/Turabian Style

Mehrez Hermassi; C. Valderrama; Joan Dosta; Jose Luis Cortina; N.H. Batis. 2015. "Evaluation of hydroxyapatite crystallization in a batch reactor for the valorization of alkaline phosphate concentrates from wastewater treatment plants using calcium chloride." Chemical Engineering Journal 267, no. : 142-152.

Journal article
Published: 01 February 2015 in Chemical Engineering Journal
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ACS Style

X. Fonoll; Sergi Astals; J. Dosta; J. Mata-Alvarez. Anaerobic co-digestion of sewage sludge and fruit wastes: Evaluation of the transitory states when the co-substrate is changed. Chemical Engineering Journal 2015, 262, 1268 -1274.

AMA Style

X. Fonoll, Sergi Astals, J. Dosta, J. Mata-Alvarez. Anaerobic co-digestion of sewage sludge and fruit wastes: Evaluation of the transitory states when the co-substrate is changed. Chemical Engineering Journal. 2015; 262 ():1268-1274.

Chicago/Turabian Style

X. Fonoll; Sergi Astals; J. Dosta; J. Mata-Alvarez. 2015. "Anaerobic co-digestion of sewage sludge and fruit wastes: Evaluation of the transitory states when the co-substrate is changed." Chemical Engineering Journal 262, no. : 1268-1274.

Journal article
Published: 19 November 2014 in Bioprocess and Biosystems Engineering
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Stabilisation and biological nitrogen removal (BNR) of anaerobically digested sewage sludge were studied in a post-aeration reactor at pilot scale working under alternating anoxic-aerobic conditions. Digested sludge came from a two-stage anaerobic digestion (thermophilic + mesophilic). The best post-aerator performance was achieved when working at an HRT of 10 days (4 days aerobic; dissolved oxygen of 1.8 mg L−1) and VS content in the feed no lower than 6.7 g L−1. Free ammonia concentration values in the effluent above 1.5 mg N L−1 (around 150 mg NH4+-N L−1 at pH 7) were necessary to promote the BNR over nitrite. Removal efficiencies up to 80 % NH4+-N, 50–55 % total nitrogen and 15–20 % VS were recorded in this study, with no external addition of chemicals. A nitrogen mass balance revealed that the high percent of NH4+-N assimilated in heterotrophic growth was counteracted with that released in ammonification and fermentation, leading to a NH4+-N removal mainly related to biological nitritation/denitritation.

ACS Style

Mikel Morras; J. Dosta; J. L. García-Heras. Aerobic/anoxic post-treatment of anaerobically digested sewage sludge as an alternative to biological nitrogen removal from reject water. Bioprocess and Biosystems Engineering 2014, 38, 823 -831.

AMA Style

Mikel Morras, J. Dosta, J. L. García-Heras. Aerobic/anoxic post-treatment of anaerobically digested sewage sludge as an alternative to biological nitrogen removal from reject water. Bioprocess and Biosystems Engineering. 2014; 38 (5):823-831.

Chicago/Turabian Style

Mikel Morras; J. Dosta; J. L. García-Heras. 2014. "Aerobic/anoxic post-treatment of anaerobically digested sewage sludge as an alternative to biological nitrogen removal from reject water." Bioprocess and Biosystems Engineering 38, no. 5: 823-831.