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The traditional anoxic/aerobic process (A/O) process is widely used for treating digested piggery wastewater, but the lack of carbon sources leads to poor efficiency. Therefore, the process needs optimization to achieve high-efficiency and low-cost operation mode. In this study, an improved A/O system with bionic aquatic weed and Myriophyllum sp. was established to decontaminate digested piggery wastewater. The average removal efficiencies of chemical oxygen demand (COD), NH4+-N, and total nitrogen (TN) by the improved A/O system was satisfactory. The average removal efficiencies of COD, NH4+-N, and TN were 62.1%, 87.5%, and 61.9%, respectively. High-throughput sequencing identified a number of dominant microorganisms. The relative abundance of Nitrosomonas (ammonia-oxidizing bacteria) and Nitrospira (nitrite-oxidizing bacteria) was 0.07%–3.52% and 0.32%–1.30%, respectively. Combining bionic aquatic weed and Myriophyllum sp. altered the microbial community structure and metabolic pathways. The results demonstrate a cost-effective method for treating digested piggery wastewater.
Ze Zhang; Minjun Zhong; Yaping Sun; Yuhai Liang; Mengxue Liu; Jin Li; Hongcan Cui; Fengang Meng; Zhujian Huang; Lihua Cui. Efficient treatment of digested piggery wastewater via an improved anoxic/aerobic process with Myriophyllum spicatum and bionic aquatic weed. Bioresource Technology 2021, 125825 .
AMA StyleZe Zhang, Minjun Zhong, Yaping Sun, Yuhai Liang, Mengxue Liu, Jin Li, Hongcan Cui, Fengang Meng, Zhujian Huang, Lihua Cui. Efficient treatment of digested piggery wastewater via an improved anoxic/aerobic process with Myriophyllum spicatum and bionic aquatic weed. Bioresource Technology. 2021; ():125825.
Chicago/Turabian StyleZe Zhang; Minjun Zhong; Yaping Sun; Yuhai Liang; Mengxue Liu; Jin Li; Hongcan Cui; Fengang Meng; Zhujian Huang; Lihua Cui. 2021. "Efficient treatment of digested piggery wastewater via an improved anoxic/aerobic process with Myriophyllum spicatum and bionic aquatic weed." Bioresource Technology , no. : 125825.
Dimethyl phthalate (DMP), belonging to the family of Phthalate esters (PAEs), is a plasticizer and has been widely used in the world for many years. Nowadays, it has become a ubiquitous environmental pollutant and is listed as an environmental priority pollutant by China’s Environmental Monitoring Center. The purpose of this study is to estimate the responses of the bacterial community and enzyme activity to DMP contamination in three vertical flow constructed wetlands (VFCW), namely the constructed wetland A (planted with Pennisetum sinese Roxb), constructed wetland B (planted with Pennisetum purpureum Schum.), and constructed wetland C (unplanted), respectively. The results showed that the relative percentages of some genera associated with nitrogen metabolism and the function of degrading aromatic hydrocarbons were increased by DMP contamination, such as Dechloromonas agitata, Pleomorphomonas sp., Denitratisoma oestradiolicum, Plasticicumulans lactativorans, Novosphingobium sp., Alicycliphilus denitrificans, and Thauera sp. Meanwhile, principal coordinate analysis (PCA) analysis showed that the addition of DMP divided 12 samples into two groups as followed: one was the DMP group containing a-1, a-2, b-1, b-2, c-1 and c-2 while the other was no DMP group including A-1, A-2, B-1, B-2, C-1 and C-2. It indicated that DMP was the main reason for this change. In addition, by monitoring the activity of substrate enzymes, the activity of urease, phosphatase, catalase, and invertase in the wetlands before and after the experiment, these were significantly higher in the upper layer than in the lower layer and maintained high activity. Ultimately, the average influent concentration of DMP in three VFCWs was 8.12 mg/L and the average removal efficiency of the effluent was over 90%. Our results suggested that DMP was an important factor affecting the microbial community structure of wetland and the upper layer of the VFCW was the main site for the degradation of DMP. VFCW has great potential for the removal of the high concentration of DMP and it can be a good choice for the treatment of PAEs.
Qiaoling Xu; Shaoyong Lu; Tao Yuan; Feng Zhang; Li Wang; Ping Wang; Xueyuan Wen; Lihua Cui. Influences of Dimethyl Phthalate on Bacterial Community and Enzyme Activity in Vertical Flow Constructed Wetland. Water 2021, 13, 788 .
AMA StyleQiaoling Xu, Shaoyong Lu, Tao Yuan, Feng Zhang, Li Wang, Ping Wang, Xueyuan Wen, Lihua Cui. Influences of Dimethyl Phthalate on Bacterial Community and Enzyme Activity in Vertical Flow Constructed Wetland. Water. 2021; 13 (6):788.
Chicago/Turabian StyleQiaoling Xu; Shaoyong Lu; Tao Yuan; Feng Zhang; Li Wang; Ping Wang; Xueyuan Wen; Lihua Cui. 2021. "Influences of Dimethyl Phthalate on Bacterial Community and Enzyme Activity in Vertical Flow Constructed Wetland." Water 13, no. 6: 788.
Although vertical flow constructed wetland (VFCW) has great potentials for degradation of water contaminants, traditional VFCW has limited removal efficiencies for pollutants. This study constructed three sets of modified VFCW systems, including VFCW-A with matrix-modification using mixture of biochar and activated carbon, VFCW-B with microbial amendment using denitrifying bacteria, and VFCW-C with combined treatments of both. Their removal efficiencies for various pollutants in synthetic municipal tailwater were investigated. Results showed that the removal efficiencies for NH4–N, NO3–N, total nitrogen (TN), total phosphorus (TP), and chemical oxygen demand (COD) by VFCW-C were higher than VFCW-B throughout the experimental period, indicating that matrix-modification could improve the VFCW performance. The higher removal efficiencies for TN, TP, and COD by VFCW-C than VFCW-A also suggested the effectiveness of microbial amendment in VFCW. However, the improved removal for NO3–N by VFCW-C over VFCW-A became less obvious at later operation stage due to insufficient carbon source. All three VFCWs achieved their best removal efficiency when carbon source was supplemented at CH3COO−/TN ratio of 0.5. Our study suggested that the combined treatment of matrix-modification using biochar/activated carbon mixture and microbial amendment using denitrifying bacteria could effectively enhance the treatment efficiency of VFCW systems for tailwater pollutants from sewage plant.
Yaping Sun; Pincheng Zhou; Nan Zhang; Ze Zhang; Qingwei Guo; Chengyu Chen; Lihua Cui. Effects of matrix modification and bacteria amendment on the treatment efficiency of municipal tailwater pollutants by modified vertical flow constructed wetland. Journal of Environmental Management 2021, 281, 111920 .
AMA StyleYaping Sun, Pincheng Zhou, Nan Zhang, Ze Zhang, Qingwei Guo, Chengyu Chen, Lihua Cui. Effects of matrix modification and bacteria amendment on the treatment efficiency of municipal tailwater pollutants by modified vertical flow constructed wetland. Journal of Environmental Management. 2021; 281 ():111920.
Chicago/Turabian StyleYaping Sun; Pincheng Zhou; Nan Zhang; Ze Zhang; Qingwei Guo; Chengyu Chen; Lihua Cui. 2021. "Effects of matrix modification and bacteria amendment on the treatment efficiency of municipal tailwater pollutants by modified vertical flow constructed wetland." Journal of Environmental Management 281, no. : 111920.
Pennisetum sinese Roxb is a kind of forage with high yield and high quality. However, because only the leaves are used as feed, most straw is discarded or burned, causing pollution and resources waste. In this study, a magnetic cellulose adsorbent produced by extracting cellulose from Pennisetum sinese Roxb straw was used to adsorb antibiotic tetracycline (TC) from water and can be easily separated. The physicochemical properties of the obtained cellulose samples were studied. The adsorption process was mediated by multiple mechanisms including intra-particle diffusion, chemical ion exchange, hydrogen bonding, and electrostatic interaction. We determined the optimal pH, contact time, initial TC concentration, and temperature before investigating the effects of humic acid and ionic strength on the adsorption process. Our results demonstrate that the magnetic cellulose is a promising adsorbent for the removal of TC from water and is worth to be studied further to develop real-world implementation strategies.
Jie Sun; Lihua Cui; Yuhan Gao; Yuzhe He; Huaqing Liu; Zhujian Huang. Environmental application of magnetic cellulose derived from Pennisetum sinese Roxb for efficient tetracycline removal. Carbohydrate Polymers 2020, 251, 117004 .
AMA StyleJie Sun, Lihua Cui, Yuhan Gao, Yuzhe He, Huaqing Liu, Zhujian Huang. Environmental application of magnetic cellulose derived from Pennisetum sinese Roxb for efficient tetracycline removal. Carbohydrate Polymers. 2020; 251 ():117004.
Chicago/Turabian StyleJie Sun; Lihua Cui; Yuhan Gao; Yuzhe He; Huaqing Liu; Zhujian Huang. 2020. "Environmental application of magnetic cellulose derived from Pennisetum sinese Roxb for efficient tetracycline removal." Carbohydrate Polymers 251, no. : 117004.
Piggery wastewater sludge is rich in organic matter but contains pollutants that are harmful to the environment and ecology, such as heavy metals. In this paper, a novel process for hazard-free treatment and resource utilization of piggery wastewater sludge was proposed. Technique combining Fe(II) coagulation, hydrothermal reaction and pyrolysis (CHP) was used to stabilize heavy metals (HMs) in sludge, and the adsorption performance of the recycled product to tylosin (TYL) was studied. SV30 (Sludge Volume 30 min) of sludge decreased from 97% to 30% after Fe(II) coagulation and water content of sludge decreased from 97% to 30% after hydrothermal treatment. After CHP treatment, the residue fraction of Cd, Pb, Cu, Zn, Cr and Ni increased by 12.1%, 67.3%, 12.4%, 15.4%, 58.5%, 2.8% respectively. With raising Fe2+ dosage, residual state of each heavy metal increases. Sludge biochar (SBC) generated after CHP process is a kind of mesoporous composite composed of goethite, quartz, biochar and polymer, and showed a high adsorption capacity for tylosin, and the process of which can be well expressed by Langmuir adsorption isotherm (R2 = 0.947). The maximum theoretical adsorption capacity of SBC for TYL can be obtained by pyrolysis at 600 °C, which can reach 58 mg g−1.
Limiao Cai; Jie Sun; Lihua Cui; Yanzi Jiang; Zhujian Huang. Stabilization of heavy metals in piggery wastewater sludge through coagulation-hydrothermal reaction–pyrolysis process and sludge biochar for tylosin removal. Journal of Cleaner Production 2020, 260, 121165 .
AMA StyleLimiao Cai, Jie Sun, Lihua Cui, Yanzi Jiang, Zhujian Huang. Stabilization of heavy metals in piggery wastewater sludge through coagulation-hydrothermal reaction–pyrolysis process and sludge biochar for tylosin removal. Journal of Cleaner Production. 2020; 260 ():121165.
Chicago/Turabian StyleLimiao Cai; Jie Sun; Lihua Cui; Yanzi Jiang; Zhujian Huang. 2020. "Stabilization of heavy metals in piggery wastewater sludge through coagulation-hydrothermal reaction–pyrolysis process and sludge biochar for tylosin removal." Journal of Cleaner Production 260, no. : 121165.
Environmental contextWater contamination by antibiotics and heavy metals entails potential risks to both the environment and human health. Composite materials based on MgAl-layered double hydroxides and biochar simultaneously adsorbed the toxic sulfamethoxazole and CrVI metal species. These findings indicate that biochar/metal hydroxide composites could be valuable adsorbents for the simultaneous removal of trace antibiotics and metals from water. AbstractWater contamination by antibiotics and heavy metals has drawn wide attention because of the potential risks it poses to both the environment and human health. In this study, a series of adsorbents was successfully synthesised based on MgAl-layered double hydroxides (LDHs) and biochar (BC) derived from Pennisetum sinese Roxb. The batch adsorption experiment results showed that the obtained composites could effectively adsorb trace sulfamethoxazole (SMX) and CrVIsimultaneously. The simultaneous adsorption of trace SMX and CrVI are well described by the pseudo-second-order kinetics and Freundlich isotherm models. Characterisation of the composites after adsorption showed that the composites adsorbed SMX mainly by π-π bonds, hydrophobic interactions and hydrogen bonds. Electrostatic interaction, anion exchange, intraparticle diffusion and hydrogen bonding are the main mechanisms for CrVI adsorption onto the composites. This study indicates that the biochar/MgAl layered double hydroxide composites are promising adsorbents for the simultaneous removal of trace antibiotics and CrVI.
Guowan Li; Zhujian Huang; Chengyu Chen; Hongcan Cui; Yijuan Su; Yang Yang; Lihua Cui. Simultaneous adsorption of trace sulfamethoxazole and hexavalent chromium by biochar/MgAl layered double hydroxide composites. Environmental Chemistry 2019, 16, 68 .
AMA StyleGuowan Li, Zhujian Huang, Chengyu Chen, Hongcan Cui, Yijuan Su, Yang Yang, Lihua Cui. Simultaneous adsorption of trace sulfamethoxazole and hexavalent chromium by biochar/MgAl layered double hydroxide composites. Environmental Chemistry. 2019; 16 (1):68.
Chicago/Turabian StyleGuowan Li; Zhujian Huang; Chengyu Chen; Hongcan Cui; Yijuan Su; Yang Yang; Lihua Cui. 2019. "Simultaneous adsorption of trace sulfamethoxazole and hexavalent chromium by biochar/MgAl layered double hydroxide composites." Environmental Chemistry 16, no. 1: 68.
With the stricter sewage discharge standards and higher environmental quality requirements, the development of advanced treatment technology of piggery tail water (the effluent of biochemical unit) is particularly urgently needed. We used dual coagulation with Na+ modified zeolite (NMZ) and Mg2+/Fe3+ chloride to remove COD, TP, NH3N and turbidity from piggery tail water. Thereafter, the on-site coagulation sludge was oxygen-limited pyrolyzed, and the pyrolyzed sludge (PS) showed a great capacity to adsorb and remove Cd2+ from water. Fourier transform infrared (FTIR) and X-ray photoelectron spectra (XPS) analysis showed that abundant new binding sites were generated after pyrolysis, and the surface morphology of PS composites were examined by scanning electron microscopy (SEM). The results confirmed the presence of NMZ, Mg/Fe metal oxides, biochar and phosphates in PS composites, leading to a synergistic effect for high efficient Cd2+ removal. The Cd2+ adsorption on the composite PS500 (sludge pyrolyzed at 500 °C) can be well expressed by Langmuir isotherm model with theoretical maximum adsorption capacity of 139.28 mg g−1. The adsorption behaviors of PS500 were affected by solution pH, coexisting ions and humic acids. Hence, dual coagulation with NMZ-Mg/Fe chloride is one of the effective methods for the advanced treatment of piggery wastewater, and the coagulation product can be utilized to remove Cd2+, which is beneficial to reduction of environmental pollution and resource recovery.
Limiao Cai; Lihua Cui; Bingjia Lin; Jiecong Zhang; Zhujian Huang. Advanced treatment of piggery tail water by dual coagulation with Na+ zeolite and Mg/Fe chloride and resource utilization of the coagulation sludge for efficient decontamination of Cd2+. Journal of Cleaner Production 2018, 202, 759 -769.
AMA StyleLimiao Cai, Lihua Cui, Bingjia Lin, Jiecong Zhang, Zhujian Huang. Advanced treatment of piggery tail water by dual coagulation with Na+ zeolite and Mg/Fe chloride and resource utilization of the coagulation sludge for efficient decontamination of Cd2+. Journal of Cleaner Production. 2018; 202 ():759-769.
Chicago/Turabian StyleLimiao Cai; Lihua Cui; Bingjia Lin; Jiecong Zhang; Zhujian Huang. 2018. "Advanced treatment of piggery tail water by dual coagulation with Na+ zeolite and Mg/Fe chloride and resource utilization of the coagulation sludge for efficient decontamination of Cd2+." Journal of Cleaner Production 202, no. : 759-769.
Thiourea-dioxide-reduced magnetic graphene oxide (TDMGO) was successfully prepared as an efficient adsorbent for the removal of tetracycline (TC) from aqueous solutions via strong adsorptive interactions. The composite was characterized by SEM, TEM, EDS, TGA, FT-IR, XPS, XRD and VSM. The effects of variables such as the pH, TC concentration, and temperature were successfully analyzed. The kinetics and isothermal parameters were described well by pseudo-second-order and Langmuir isotherm models, respectively, and the maximum adsorption capacity (qm) of TDMGO for TC calculated from the Langmuir isotherm was 1233mg/g at 313K. The removal of TC onto TDMGO, as indicated by the thermodynamic parameters, was spontaneous and endothermic. The removal performance was slightly affected by the solution pH. The presence of NaCl in the solution facilitated TC adsorption, and the optimum adsorption capacity was obtained when the NaCl concentration was >0.001M. The adsorption capacity decreased slightly with increasing humic acid concentration. In addition, the adsorbent could be regenerated and reused. Based on these results, TDMGO is a promising adsorbent for the efficient removal of TC antibiotics from aquatic environments for pollution treatment.
Yuanxiu Yang; Xinjiang Hu; Yunlin Zhao; Lihua Cui; Zhujian Huang; Jianliang Long; Jiawen Xu; Jianbin Deng; Cuiyu Wu; Wenwei Liao. Decontamination of tetracycline by thiourea-dioxide–reduced magnetic graphene oxide: Effects of pH, ionic strength, and humic acid concentration. Journal of Colloid and Interface Science 2017, 495, 68 -77.
AMA StyleYuanxiu Yang, Xinjiang Hu, Yunlin Zhao, Lihua Cui, Zhujian Huang, Jianliang Long, Jiawen Xu, Jianbin Deng, Cuiyu Wu, Wenwei Liao. Decontamination of tetracycline by thiourea-dioxide–reduced magnetic graphene oxide: Effects of pH, ionic strength, and humic acid concentration. Journal of Colloid and Interface Science. 2017; 495 ():68-77.
Chicago/Turabian StyleYuanxiu Yang; Xinjiang Hu; Yunlin Zhao; Lihua Cui; Zhujian Huang; Jianliang Long; Jiawen Xu; Jianbin Deng; Cuiyu Wu; Wenwei Liao. 2017. "Decontamination of tetracycline by thiourea-dioxide–reduced magnetic graphene oxide: Effects of pH, ionic strength, and humic acid concentration." Journal of Colloid and Interface Science 495, no. : 68-77.
In this study, enzyme activities and their relationships to organics purification were investigated in three different vertical flow constructed wetlands, namely system A (planting Pennisetum sinese Roxb), system B (planting Pennisetum purpureum Schum.), and system C (no plant). These three wetland systems were fed with simulation domestic sewage at an influent flow rate of 20 cm/day. The results showed that the final removal efficiency of Chemical Oxygen Demand (COD) in these three systems was 87%, 85% and 63%, respectively. Planting Pennisetum sinese Roxb and Pennisetum purpureum Schum. could improve the amount of adsorption and interception for organic matter in the substrate, and the amount of interception of organic matter in planting the Pennisetum sinese Roxb system was higher than that in planting the Pennisetum purpureum Schum. system. The activities of enzymes (urease, phosphatase and cellulase) in systems A and B were higher than those in system C, and these enzyme activities in the top layer (0–30 cm) were significantly higher than in the other layers. The correlations between the activities of urease, phosphatase, cellulase and the COD removal rates were R = 0.815, 0.961 and 0.973, respectively. It suggests that using Pennisetum sinese Roxb and Pennisetum purpureum Schum. as wetland plants could promote organics removal, and the activities of urease, phosphatase and cellulase in those three systems were important indicators for COD purification from wastewater. In addition, 0–30 cm was the main function layer. This study could provide a theoretical basis for COD removal in the wetland system and supply new plant materials for selection.
Qiaoling Xu; Shuona Chen; Zhujian Huang; Lihua Cui; Xiaomao Wang. Evaluation of Organic Matter Removal Efficiency and Microbial Enzyme Activity in Vertical-Flow Constructed Wetland Systems. Environments 2016, 3, 26 .
AMA StyleQiaoling Xu, Shuona Chen, Zhujian Huang, Lihua Cui, Xiaomao Wang. Evaluation of Organic Matter Removal Efficiency and Microbial Enzyme Activity in Vertical-Flow Constructed Wetland Systems. Environments. 2016; 3 (4):26.
Chicago/Turabian StyleQiaoling Xu; Shuona Chen; Zhujian Huang; Lihua Cui; Xiaomao Wang. 2016. "Evaluation of Organic Matter Removal Efficiency and Microbial Enzyme Activity in Vertical-Flow Constructed Wetland Systems." Environments 3, no. 4: 26.
In this work, three hybrid vertical down-flow constructed wetland (HVDF-CW) systems with different compound substrates were fed with domestic sewage and their pollutants removal performance under different hydraulic loading and step-feeding ratio was investigated. The results showed that the hydraulic loading and step-feeding ratio were two crucial factors determining the removal efficiency of most pollutants, while substrate types only significantly affected the removal of COD and NH4+-N. Generally, the lower the hydraulic loading, the better removal efficiency of all contaminants, except for TN. By contrast, the increase of step-feeding ratio would slightly reduce the removal rate of ammonium and TP but obviously promoted the TN removal. Therefore, the optimal operation of this CWs could be achieved with low hydraulic loading combined with 50% of step-feeding ratio when TN removal is the priority, whereas medium or low hydraulic loading without step-feeding would be suitable when TN removal is not taken into consideration. The obtained results in this study can provide us with a guideline for design and optimization of hybrid vertical flow constructed wetland systems to improve the pollutants removal from domestic sewage.
Zhujian Huang; Xianning Zhang; Lihua Cui; Guangwei Yu. Optimization of operating parameters of hybrid vertical down-flow constructed wetland systems for domestic sewerage treatment. Journal of Environmental Management 2016, 180, 384 -389.
AMA StyleZhujian Huang, Xianning Zhang, Lihua Cui, Guangwei Yu. Optimization of operating parameters of hybrid vertical down-flow constructed wetland systems for domestic sewerage treatment. Journal of Environmental Management. 2016; 180 ():384-389.
Chicago/Turabian StyleZhujian Huang; Xianning Zhang; Lihua Cui; Guangwei Yu. 2016. "Optimization of operating parameters of hybrid vertical down-flow constructed wetland systems for domestic sewerage treatment." Journal of Environmental Management 180, no. : 384-389.
In this study, two bioenergy plants, namely the Pennisetum sinese Roxb and Pennisetum purpureum Schum., were selected as wetland vegetation to remove nitrogen (N) and phosphorous (P) in vertical-flow constructed wetland (CW) systems. The total net nutrient accumulation by CW plants was 104 g N/m2 and 7.6 g P/m2 for Pennisetum sinese Roxb, 144 g N/m2 and 8.71 g P/m2 for Pennisetum purpureum Schum. Three CW systems (System A planting with Pennisetum sinese Roxb, System B planting with Pennisetum purpureum Schum., and System C without planting) were designed to evaluate total nitrogen (TN) and total phosphorus (TP) removal efficiency from wastewater. Results showed that the removal efficiency of TP from both System A and System B were significantly higher than that of System C, but there are no significant differences of the removal of TN among the three CW systems. After a five-month CW operation, System C was clogged and the TP removal efficiency was negative due to desorption of TP from the substrate. Our study demonstrated that the two newly selected plant species had a positive effect on removing TN and TP from wastewater and reducing clogging in the CW systems.
Qiaoling Xu; Zhujian Hunag; Xiaomao Wang; Lihua Cui. Pennisetum sinese Roxb and Pennisetum purpureum Schum. as vertical-flow constructed wetland vegetation for removal of N and P from domestic sewage. Ecological Engineering 2015, 83, 120 -124.
AMA StyleQiaoling Xu, Zhujian Hunag, Xiaomao Wang, Lihua Cui. Pennisetum sinese Roxb and Pennisetum purpureum Schum. as vertical-flow constructed wetland vegetation for removal of N and P from domestic sewage. Ecological Engineering. 2015; 83 ():120-124.
Chicago/Turabian StyleQiaoling Xu; Zhujian Hunag; Xiaomao Wang; Lihua Cui. 2015. "Pennisetum sinese Roxb and Pennisetum purpureum Schum. as vertical-flow constructed wetland vegetation for removal of N and P from domestic sewage." Ecological Engineering 83, no. : 120-124.
Three new baffle flow constructed wetlands (CWs), namely the baffle horizontal flow CW (Z1), baffle vertical flow CW (Z2) and baffle hybrid flow CW (Z3), along with one traditional horizontal subsurface flow CW (Z4) were designed to test the removal efficiency of nitrogen (N) and phosphorus (P) from the septic tank effluent under varying hydraulic retention times (HRTs). Results showed that the optimal HRT was two days for maximal removal of N and P from the septic tank effluent among the four CWs. At this HRT, the Z1, Z2, Z3 and Z4 CWs removed, respectively, 49.93, 58.50, 46.01 and 44.44% of TN as well as 87.82, 93.23, 95.97 and 91.30% of TP. Our study further revealed that the Z3 CW was the best design for overall removal of N and P from the septic tank effluent due to its hybrid flow directions with better oxygen supply inside the CW system.
Lihua Cui; Ying Ouyang; Weizhi Yang; Zhujian Huang; Qiaoling Xu; Guangwei Yu. Removal of nutrients from septic tank effluent with baffle subsurface-flow constructed wetlands. Journal of Environmental Management 2015, 153, 33 -39.
AMA StyleLihua Cui, Ying Ouyang, Weizhi Yang, Zhujian Huang, Qiaoling Xu, Guangwei Yu. Removal of nutrients from septic tank effluent with baffle subsurface-flow constructed wetlands. Journal of Environmental Management. 2015; 153 ():33-39.
Chicago/Turabian StyleLihua Cui; Ying Ouyang; Weizhi Yang; Zhujian Huang; Qiaoling Xu; Guangwei Yu. 2015. "Removal of nutrients from septic tank effluent with baffle subsurface-flow constructed wetlands." Journal of Environmental Management 153, no. : 33-39.
In this study, the enzyme activities and their relationships to domestic wastewater purification are investigated in four different types of subsurface-flow constructed wetlands (CWs), namely the traditional horizontal subsurface-flow, horizontal baffled subsurface-flow, vertical baffled subsurface-flow, and composite baffled subsurface-flow CWs. Results showed that the urease activity in the composite baffled subsurface-flow CW was significantly higher than in the other three CWs, while the phosphatase activity in the vertical baffled subsurface-flow CW were higher than in the other three CWs. There were significant and very significant correlations between the activities of urease and the removal rates of TN and NH4+–N for the horizontal baffled flow, horizontal subsurface flow, and composite baffled subsurface flow CWs. This study suggests that the activity of urease in the root zones of those three CWs is an important indicator for N purification from wastewaters.
Lihua Cui; Ying Ouyang; Wenjie Gu; Weizhi Yang; Qiaoling Xu. Evaluation of nutrient removal efficiency and microbial enzyme activity in a baffled subsurface-flow constructed wetland system. Bioresource Technology 2013, 146, 656 -662.
AMA StyleLihua Cui, Ying Ouyang, Wenjie Gu, Weizhi Yang, Qiaoling Xu. Evaluation of nutrient removal efficiency and microbial enzyme activity in a baffled subsurface-flow constructed wetland system. Bioresource Technology. 2013; 146 ():656-662.
Chicago/Turabian StyleLihua Cui; Ying Ouyang; Wenjie Gu; Weizhi Yang; Qiaoling Xu. 2013. "Evaluation of nutrient removal efficiency and microbial enzyme activity in a baffled subsurface-flow constructed wetland system." Bioresource Technology 146, no. : 656-662.
Ying Ouyang; Jia-En Zhang; Li Hua Cui; Peter Nkedi-Kizza. Simulating the Transport and Fate of Trifluralin in Soil. Journal of Sustainable Watershed Science and Management 2012, 1, 53 -60.
AMA StyleYing Ouyang, Jia-En Zhang, Li Hua Cui, Peter Nkedi-Kizza. Simulating the Transport and Fate of Trifluralin in Soil. Journal of Sustainable Watershed Science and Management. 2012; 1 (2):53-60.
Chicago/Turabian StyleYing Ouyang; Jia-En Zhang; Li Hua Cui; Peter Nkedi-Kizza. 2012. "Simulating the Transport and Fate of Trifluralin in Soil." Journal of Sustainable Watershed Science and Management 1, no. 2: 53-60.
Wen-Ling Zhu; Li-Hua Cui; Ying Ouyang; Cui-Fen Long; Xiao-Dan Tang. Kinetic Adsorption of Ammonium Nitrogen by Substrate Materials for Constructed Wetlands. Pedosphere 2011, 21, 454 -463.
AMA StyleWen-Ling Zhu, Li-Hua Cui, Ying Ouyang, Cui-Fen Long, Xiao-Dan Tang. Kinetic Adsorption of Ammonium Nitrogen by Substrate Materials for Constructed Wetlands. Pedosphere. 2011; 21 (4):454-463.
Chicago/Turabian StyleWen-Ling Zhu; Li-Hua Cui; Ying Ouyang; Cui-Fen Long; Xiao-Dan Tang. 2011. "Kinetic Adsorption of Ammonium Nitrogen by Substrate Materials for Constructed Wetlands." Pedosphere 21, no. 4: 454-463.
Vertical-flow constructed wetland (VFCW) is an effective alternative for removal of nutrients, heavy metals, and organic pollutants from wastewaters. This study investigated the uptake and removal of total phosphorus (TP) by Cyperus alternifolius from domestic wastewaters in the simulated VFCWs. The total of eight simulated VFCW treatments, including two different substrates, two different wet-to-dry ratios, and with and without C. alternifolius species (2 × 2 × 2 = 8), were utilized for an operation period of two years in this study. Results show that about 1.1 to 1.4 times more TP was removed from the influent with the presence of C. alternifolius as compared to without this plant species. A linear correlation existed between the aboveground biomass and its TP content. An increase in total biomass by 1000 g would result in an increase in TP accumulation in the aboveground biomass by 4.9g. Large amounts of TP were removed by the substrate adsorption as compared to those by the aboveground biomass. Results suggest that, although substrate adsorption played a major role in TP removal, C. alternifolius uptake was an alternative pathway for further removal of TP from wastewaters in the VFCWs.
Li-Hua Cui; Xi-Zhen Zhu; Ying Ouyang; Yin Chen; Feng-Le Yang. TOTAL PHOSPHORUS REMOVAL FROM DOMESTIC WASTEWATER WITHCYPERUS ALTERNIFOLIUSIN VERTICAL-FLOW CONSTRUCTED WETLANDS AT THE MICROCOSM LEVEL. International Journal of Phytoremediation 2011, 13, 692 -701.
AMA StyleLi-Hua Cui, Xi-Zhen Zhu, Ying Ouyang, Yin Chen, Feng-Le Yang. TOTAL PHOSPHORUS REMOVAL FROM DOMESTIC WASTEWATER WITHCYPERUS ALTERNIFOLIUSIN VERTICAL-FLOW CONSTRUCTED WETLANDS AT THE MICROCOSM LEVEL. International Journal of Phytoremediation. 2011; 13 (7):692-701.
Chicago/Turabian StyleLi-Hua Cui; Xi-Zhen Zhu; Ying Ouyang; Yin Chen; Feng-Le Yang. 2011. "TOTAL PHOSPHORUS REMOVAL FROM DOMESTIC WASTEWATER WITHCYPERUS ALTERNIFOLIUSIN VERTICAL-FLOW CONSTRUCTED WETLANDS AT THE MICROCOSM LEVEL." International Journal of Phytoremediation 13, no. 7: 692-701.
Vertical-flow constructed wetland (VFCW) is a promising technique for wastewater treatment comparable to conventional wastewater treatment plants. The physical, chemical, and biological processes and interactions in a VFCW are highly coupled with water movement, and thus the performance of a VFCW to remove contaminants hinges on a better understanding of its water dynamics. The aim of this study was to develop a model for estimating water dynamics in an artificial VFCW with a growing plant system.
Ying Ouyang; Shi Ming Luo; Li Hua Cui; Ying Hu Liu; Zhong Qin. Estimation of water dynamics in a vertical-flow constructed wetland with a growing plant species. Journal of Soils and Sediments 2010, 10, 1219 -1228.
AMA StyleYing Ouyang, Shi Ming Luo, Li Hua Cui, Ying Hu Liu, Zhong Qin. Estimation of water dynamics in a vertical-flow constructed wetland with a growing plant species. Journal of Soils and Sediments. 2010; 10 (7):1219-1228.
Chicago/Turabian StyleYing Ouyang; Shi Ming Luo; Li Hua Cui; Ying Hu Liu; Zhong Qin. 2010. "Estimation of water dynamics in a vertical-flow constructed wetland with a growing plant species." Journal of Soils and Sediments 10, no. 7: 1219-1228.
The vertical-flow constructed wetland (VFCW) is a promising engineering technique for removal of excess nutrients and certain pollutants from wastewaters. This study investigated the uptake and removal of total nitrogen (TN) by Cyperus alternifolius from domestic wastewaters in simulated VFCWs. A total of eight simulated VFCW treatments, including two different substrates, two different wet-to-dry ratios, and with and without C. alternifolius species (2 × 2 × 2 = 8), were employed for an operation period of 2 years in this study. Results show that more TN was removed from the influent with the presence of C. alternifolius compared to without this plant species. A linear correlation existed between the aboveground biomass and its TN content. An increase in total biomass by 100 g resulted in an increase in TN accumulation in the aboveground biomass by 2.4 g. Large amounts of TN were removed by the aboveground biomass compared to those by substrate adsorption. Results suggest that C. alternifolius played a discernable role in removal of TN from wastewaters in the simulated VFCWs.
Li-Hua Cui; Ying Ouyang; Yin Chen; Xi-Zhen Zhu; Wen-Ling Zhu. Removal of total nitrogen by Cyperus alternifolius from wastewaters in simulated vertical-flow constructed wetlands. Ecological Engineering 2009, 35, 1271 -1274.
AMA StyleLi-Hua Cui, Ying Ouyang, Yin Chen, Xi-Zhen Zhu, Wen-Ling Zhu. Removal of total nitrogen by Cyperus alternifolius from wastewaters in simulated vertical-flow constructed wetlands. Ecological Engineering. 2009; 35 (8):1271-1274.
Chicago/Turabian StyleLi-Hua Cui; Ying Ouyang; Yin Chen; Xi-Zhen Zhu; Wen-Ling Zhu. 2009. "Removal of total nitrogen by Cyperus alternifolius from wastewaters in simulated vertical-flow constructed wetlands." Ecological Engineering 35, no. 8: 1271-1274.
Li-Hua Cui; Wen Liu; Xi-Zhen Zhu; Mei Ma; Xi-Hua Huang; Yan-Yang Xia. Performance of hybrid constructed wetland systems for treating septic tank effluent. Journal of Environmental Sciences 2006, 18, 1 .
AMA StyleLi-Hua Cui, Wen Liu, Xi-Zhen Zhu, Mei Ma, Xi-Hua Huang, Yan-Yang Xia. Performance of hybrid constructed wetland systems for treating septic tank effluent. Journal of Environmental Sciences. 2006; 18 (4):1.
Chicago/Turabian StyleLi-Hua Cui; Wen Liu; Xi-Zhen Zhu; Mei Ma; Xi-Hua Huang; Yan-Yang Xia. 2006. "Performance of hybrid constructed wetland systems for treating septic tank effluent." Journal of Environmental Sciences 18, no. 4: 1.
Li-Hua Cui; Shi-Ming Luo; Xi-Zhen Zhu; Ying-Hu Liu. Treatment and utilization of septic tank effluent using vertical-flow constructed wetlands and vegetable hydroponics. Journal of Environmental Sciences 2003, 15, 1 .
AMA StyleLi-Hua Cui, Shi-Ming Luo, Xi-Zhen Zhu, Ying-Hu Liu. Treatment and utilization of septic tank effluent using vertical-flow constructed wetlands and vegetable hydroponics. Journal of Environmental Sciences. 2003; 15 (1):1.
Chicago/Turabian StyleLi-Hua Cui; Shi-Ming Luo; Xi-Zhen Zhu; Ying-Hu Liu. 2003. "Treatment and utilization of septic tank effluent using vertical-flow constructed wetlands and vegetable hydroponics." Journal of Environmental Sciences 15, no. 1: 1.