Article
Green & Sustainable Science & Technology
Qian Wang, Jiewei Ding, Huijun Xie, Derek Hao, Yuanda Du, Congcong Zhao, Fei Xu, Qiang Kong, Baoshan Wang
Summary: The study found that using intertidal wetland sediments as a microbial source for CWs can effectively improve phosphorus removal rates, with bacteria such as phosphorus-accumulating organisms enhancing microbial transformation of phosphorus. However, the addition of IWS increased phosphorus loss via substrate accumulation and decreased phosphorus removal rate via plant uptake.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Environmental Sciences
Ling Zhang, Changzhou Yan, Dapeng Wang, Zhuo Zhen
Summary: This study explored the spatiotemporal dynamics of sulfonamide antibiotic resistance genes (ARGs) in vertical upflow subsurface flow constructed wetlands (VUSFCW). The results showed that the distribution of ARGs varied among different layers, with the bottom layer being the main stage of removal. Physical-chemical factors, microorganisms, and antibiotics indirectly influenced the distribution of ARGs through mobile genetic elements. Potential host species of ARGs were more abundant in summer compared to winter. VUSFCW showed effectiveness in reducing the abundance of ARGs and the risk of pathogens carrying ARGs.
ENVIRONMENTAL POLLUTION
(2022)
Article
Environmental Sciences
Jun Chen, Shuang-Shuang Liu, Yi-Jie Wang, Jie Li, You-Sheng Liu, Fang Yang, Guang-Guo Ying
Summary: Constructed wetlands have been proven to be reliable for removing various contaminants, including steroid hormones. By optimizing design parameters, such as aeration and series wetland units, the removal efficiency of steroid hormones can be significantly improved. Biodegradation plays a dominant role in removing steroid hormones, while substrate adsorption and plant uptake also contribute to the removal process.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Agricultural Engineering
Jinjin Chen, Mengchun Gao, Yangguo Zhao, Liang Guo, Chunji Jin, Junyuan Ji, Zonglian She
Summary: This study investigated the removal of nitrogen and sulfamethoxazole (SMX), and the microbial communities in a partially saturated vertical flow constructed wetland (PS-VFCW) fed with synthetic mariculture wastewater operated at different saturated zone depths (SZDs). The results showed that SZD had a significant impact on the removal efficiency, with different depths showing variation in nitrification and denitrification performance. Various important microbial communities were found in the unsaturated zone, which played a key role in the removal of organics, nitrogen, and SMX.
BIORESOURCE TECHNOLOGY
(2022)
Article
Green & Sustainable Science & Technology
Yang-yang Deng, Meng-yao Zou, Wen Liu, Ying-li Lian, Qin-mei Guo, Xiao-meng Zhang, A. Dan
Summary: Aquaculture discharge is a significant contributor to antibiotic contamination, but there has been limited focus on removing antibiotics from aquaculture wastewater. This study used nine constructed wetlands with different configurations to treat aquaculture wastewater and evaluate antibiotic removal efficiency and mechanisms. The results showed that the highest removal percentages of certain antibiotics were achieved with the optimal configuration of wetlands. Microbial degradation, particularly anaerobic processes, were identified as the major pathway for antibiotic removal. In addition, specific combinations of substrate, plants, and hydraulic retention time influenced the microbial composition and oxygen conditions in the wetlands, promoting antibiotic removal.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Environmental Sciences
Yingrun Chen, Jian Zhang, Zizhang Guo, Ming Li, Haiming Wu
Summary: This study explored the effects of biomass dosage on the treatment performance, N2O emission, and microbial metabolites in constructed wetlands. The results showed that the addition of biomass significantly enhanced the denitrification performance, with a slight increase in N2O emission. Additionally, the biomass addition increased the accumulation of EPS.
ENVIRONMENTAL RESEARCH
(2022)
Article
Green & Sustainable Science & Technology
Saroj Kumar, Sampurna Nand, Bhanu Pratap, Divya Dubey, Venkatesh Dutta
Summary: This study examined the efficiency of different combinations of macrophytes in constructed wetland microcosms for removing water contaminants, finding that mixed planting units showed higher removal potential for heavy metals compared to single species. The removal efficiencies varied for different metals at different retention times, with highest removal at 14 days. Additionally, the correlation between removal efficiencies of heavy metals and other parameters showed significant variation over time.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Ecology
Mario Licata, Davide Farruggia, Teresa Tuttolomondo, Nicolo Iacuzzi, Claudio Leto, Giuseppe Di Miceli
Summary: Constructed wetland systems are ideal for small and medium dairy farms, but their performance is influenced by vegetation activity. This study evaluated the treatment of dairy waste-water and the impact of plants on pollutant removal efficiency in Sicily, Italy. The results showed that plant growth rates led to seasonal variations in pollutant removal.
ECOLOGICAL ENGINEERING
(2022)
Article
Environmental Sciences
Roohul Abad Khan, Nadeem A. Khan, Rachida El Morabet, Majed Alsubih, Amadur Rahman Khan, Saimah Khan, Muhammad Mubashir, Deepanraj Balakrishnan, Kuan Shiong Khoo
Summary: Pharmaceutical compounds in hospital wastewater can be effectively removed using constructed wetland combined with tubesettler and aeration, reducing ecological risk.
ENVIRONMENTAL RESEARCH
(2023)
Article
Fisheries
Johanne Dalsgaard, Mathis von Ahnen, Per Bovbjerg Pedersen
Summary: The study found that particulate nutrient removal in MTF wetlands mainly occurs through sedimentation, while dissolved nutrient removal relies on biologically mediated processes. Nitrogen and phosphorus removal fluctuates seasonally, with temperature likely influencing nitrate removal. Overall, enhancing nitrate removal in slow-flowing MTF wetlands would require carbon dosing, while further improving ammonia and phosphorus removal would involve reducing their input into the wetlands.
AQUACULTURE ENVIRONMENT INTERACTIONS
(2021)
Article
Engineering, Environmental
Nadine A. Sossalla, Jaime Nivala, Thorsten Reemtsma, Rita Schlichting, Maria Koenig, Nicolas Forquet, Manfred van Afferden, Roland A. Mueller, Beate Escher
Summary: The study demonstrated that intensified treatment wetlands have higher removal efficiency for micropollutants and mixture effects compared to conventional (non-aerated) HF wetlands, and in some cases, even outperformed the WWTP. The two-stage wetland system showed the most significant removal efficacy for all biological effects.
Article
Chemistry, Multidisciplinary
Majed Alsubih, Rachida El Morabet, Roohul Abad Khan, Nadeem A. Khan, Amadur Rahman Khan, Saimah Khan, Nazneen Mushtaque, Arshad Hussain, Mahmood Yousefi
Summary: Constructed wetland utilizes vegetation as a natural medium to remove pollutants from wastewater. This study evaluates the performance of constructed wetland in different seasons and assesses the removal efficiency and environmental risk of pharmaceutical compounds. The results show that the seasonal variation and dilution effect influence the removal of these compounds, and further research is needed to understand the removal mechanisms in different climatic conditions.
ARABIAN JOURNAL OF CHEMISTRY
(2022)
Article
Engineering, Environmental
Fidelis Odedishemi Ajibade, Wan-Xin Yin, Awoke Guadie, Temitope Fausat Ajibade, Ying Liu, Mathieu Nsenga Kumwimba, Wen-Zong Liu, Jing-Long Han, Hong-Cheng Wang, Ai-Jie Wang
Summary: This study explored the feasibility and mechanism of biochar-amended constructed wetlands for regulating the removal of sulfamethoxazole and accumulation of antibiotic resistance genes in low C/N wastewater. Results showed that biochar amendment significantly enhanced the oxidation and reduction reactions in the wetlands, leading to improved removal of COD, nitrogen, and sulfamethoxazole, as well as reduced accumulation of antibiotic resistance genes.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Agricultural Engineering
Zhen Li, Lu Li, Haoyu Sun, Wenjuan Wang, Yuying Yang, Zhengliang Qi, Xinli Liu
Summary: The study found that NH4+-N concentration significantly influences bacterial denitrification. Low concentrations of NH4+-N can accelerate denitrification, while high concentrations can inhibit it.
BIORESOURCE TECHNOLOGY
(2022)
Article
Green & Sustainable Science & Technology
Tao Zheng, Xiaohu Lin, Jingcheng Xu, Jie Ren, Danyan Sun, Yunhui Gu, Juwen Huang
Summary: This study combined sulfur autotrophic denitrification (SAD) with conventional constructed wetlands to enhance the denitrification performance for steel rolling wastewater with low C/N ratio. The combination of HFC and HFSAD showed better removal efficiency for contaminants compared to using HFC alone. Increasing hydraulic retention time can improve the removal efficiency of pollutants in both HFC and HFSAD.
Article
Engineering, Environmental
Shiyang Zhang, Xin He, Veljko Prodanovic, Kefeng Zhang
Summary: The removal of NO3- N was not closely related to filling ratio, but there were significant differences in biomass. Excessively thick biofilm hindered the enzymatic hydrolysis of PCL, while backwash stimulated organic matter release and enabled biofilm restoration of denitrification activity.
WATER ENVIRONMENT RESEARCH
(2021)
Article
Environmental Sciences
Wenjiao Sang, Longjie Mei, Cheng Zhan, Qian Zhang, Xi Jin, Shaohui Zhang, Shiyang Zhang, Cuihua Li, Min Li
Summary: Manganese activated carbon (Mn-AC) was successfully prepared and characterized in this study. The combination of dielectric barrier discharge (DBD) plasma with Mn-AC was found to effectively remove N,N-dimethylformamide (DMF). Factors such as discharge power, initial concentration, pH, and catalyst dosage were identified as influencing the removal efficiency of pollutants.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Biotechnology & Applied Microbiology
Shiyang Zhang, Qingbo Zhong, Yinghe Jiang, Meng Li, Shibin Xia
Summary: Temperature variation can significantly affect the purification performance of bioreactors by enhancing nutrient removal and influencing the composition and dominant species of microbial communities. Nitrifiers play a key role in the purification process, closely related to the severe lack of carbon sources in treated wastewater.
Article
Engineering, Environmental
Shiyang Zhang, Jing Chen, Wenjiao Sang, Meng Li, Veljko Prodanovic, Kefeng Zhang
Summary: This study demonstrated that in the novel double-layer-packed sequencing batch biofilm reactors, the optimal DO for performance was 2.0 mg/L, with the aerobic section contributing the most. The variation in DO influenced the bacterial community structure, leading to different performance outcomes.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2021)
Article
Engineering, Chemical
Yijie Feng, Wenjiao Sang, Zhiyi Deng, Shiyang Zhang, Cuihua Li
Summary: Co-N-C@SiO2 composite material, with Co and N-doped carbon as core and SiO2 as shell, was successfully synthesized by template method. The SiO2 shell increased active sites and stability, showing potential for application in SMX degradation reactions.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Water Resources
Shiyang Zhang, Jing Chen, Julin Yuan, Guangjun Wang
Summary: This study evaluated the performance of five continuously aerated biofilm reactors treating high-strength aquaculture wastewater, finding that continuous aeration is beneficial for nitrification and simultaneous nitrification-denitrification (SND) mainly removes total inorganic nitrogen (TIN) primarily in the form of ammonium. The study also identified the optimal dissolved oxygen concentration for achieving the highest proportional removals of total nitrogen and TIN.
WATER PRACTICE AND TECHNOLOGY
(2021)
Article
Agricultural Engineering
Shiyang Zhang, Longqu Xiao, Zhiwei Tang, Xiangling Zhang, Zhi Wang
Summary: This study investigated the fluctuating profiles of physicochemical and microbial characterizations along different filling heights of continuously up-flow solid-phase denitrification columns packed with PCL. It was found that both the PCL filling area and non-filling area significantly contributed to treatment performance, with denitrification mainly occurring near the bottom of the filling column. Nitrate showed high removal rates, while nitrite and ammonium displayed weak accumulation in final effluents.
BIORESOURCE TECHNOLOGY
(2022)
Article
Agricultural Engineering
Xin He, Shiyang Zhang, Yinghe Jiang, Meng Li, Julin Yuan, Guangjun Wang
Summary: This study constructed three up-flow fixed-bed bioreactors with different filling ratios of polycaprolactone (PCL) and found that a low filling ratio favored microbial attachment and growth, while a high influent nitrate load promoted the presence of nitrate reductase and nitrite reductase. Therefore, reducing the filling ratio or increasing the hydraulic retention time (HRT) may be effective measures to save costs for nitrate removal.
BIORESOURCE TECHNOLOGY
(2021)
Article
Biotechnology & Applied Microbiology
Shiyang Zhang, Zhiwei Tang, Shibin Xia, Yinghe Jiang, Meng Li, Bing Wang
Summary: The study investigated the effect of nitrate loading rate (NLR) on the treatment performance of solid-phase denitrification (SPD) systems. Results showed that the denitrification efficiency was high and stable, except at the highest NLR, which lacked available carbon sources. The bacterial community structure was mainly influenced by NLR rather than the filling ratio. Nitrogen metabolism pathways included denitrification, dissimilatory nitrate reduction to ammonium (DNRA), assimilatory nitrate reduction to ammonium (ANRA), and nitrogen fixation. These findings have practical applications.
Article
Environmental Sciences
Shuangshuang Yao, Lei Liu, Shiyang Zhang, Xinhua Tang
Summary: A heterotrophic and autotrophic denitrification system was developed for groundwater nitrate removal. The system combined solid-phase heterotrophic denitrification and electrochemical hydrogen autotrophic denitrification, using polycaprolactone as a carbon source to enhance nitrate removal performance. The study investigated the denitrification performance, microbial community structure, and nitrogen metabolism. The results showed that the system achieved a high nitrate removal rate, promoted complete denitrification, and reduced nitrite accumulation. Key denitrifying bacteria were identified, and electrical stimulation was found to increase their abundance. The study demonstrated the potential of the developed system for groundwater nitrate removal.
Article
Green & Sustainable Science & Technology
Xin Yang, Julin Yuan, Weijie Guo, Xinhua Tang, Shiyang Zhang
Summary: Aquaculture wastewater can be effectively treated by using sequencing batch biofilm reactor (SBBR) with simultaneous nitrification and denitrification (SND), and the choice of aeration strategy plays a significant role in the treatment process. The study found that changing the aeration sequence can affect the abundance of functional microbes, key enzymes, and the removal efficiency of nitrogen from the wastewater. Post-aeration was found to be more beneficial in maintaining the abundance of nitrifying bacteria and key enzymes, as well as improving the removal efficiency of ammonium nitrogen.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Green & Sustainable Science & Technology
Wentao Zhu, Jing Chen, Sicheng Yuan, Wenjiao Sang, Yihui Ban, Shiyang Zhang
Summary: In this study, three double-layered mixotrophic sequencing batch biofilm reactors involving pyrite-based autotrophic denitrification were used to treat real domestic wastewater. By adjusting the frequency of intermittent aeration to 16 times per operating cycle, high removal percentages of ammonium-nitrogen, total nitrogen, and orthophosphate were achieved. The dominant microbial taxa observed in the system were found to contribute to the multiple nitrogen metabolism, and sulfur metabolic pathways were also identified. These findings provide new insights into the nutrient removal mechanism in PAD-based mixotrophic denitrification systems treating real domestic wastewater under intermittent aeration mode.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Engineering, Environmental
Sicheng Yuan, Wentao Zhu, Weijie Guo, Wenjiao Sang, Shiyang Zhang
Summary: Biological denitrification is crucial for purifying nitrate-containing wastewater, and pyrite and polycaprolactone can be used to construct different denitrification systems. The combined mode shows the best performance, achieving high removal rates for nitrate and phosphate while reducing sulfate concentration.
WATER ENVIRONMENT RESEARCH
(2022)
Article
Environmental Sciences
Wentao Zhu, Jing Chen, Hongjun Zhang, Sicheng Yuan, Weijie Guo, Qian Zhang, Shiyang Zhang
Summary: In this research, a pyrite-intensified hybrid sequencing batch biofilm reactor (PIHSBBR) was designed to treat low C/N ratio domestic wastewater. The results showed that PIHSBBR could achieve optimal removal of COD, NH4+-N, and TN under certain conditions. High-throughput sequencing analysis revealed the presence of anaerobic ammonium oxidation and dissimilatory nitrate reduction to ammonium within the system.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Environmental Sciences
Sicheng Yuan, Qingbo Zhong, Hongjun Zhang, Wentao Zhu, Weibo Wang, Meng Li, Xinhua Tang, Shiyang Zhang
Summary: In this study, three denitrification systems were constructed using pyrite and polycaprolactone as electron donors and operated under varying hydraulic retention times. Compared with autotrophic denitrification (PAD) or heterotrophic denitrification (PHD), the split-mixotrophic denitrification (PPMD) system achieved higher removals of NO3-N and PO4-P, with a greatly reduced effluent SO4 concentration. Gene prediction and metabolic pathway analysis revealed the increase in functional gene abundance and specific conversion mechanisms in the PPMD system with the increase of HRT.
ENVIRONMENTAL RESEARCH
(2023)
Article
Ecology
Alexander M. Cancelli, Frank A. P. C. Gobas
Summary: A mechanistic model was developed to assess the removal efficiency of pollutants in a wetland system, particularly in oil sands process-affected water (OSPW). The model simulated wetland mechanisms of chemical removal and showed that sustained wetland treatment is feasible. It is a helpful tool to evaluate the feasibility of treatment systems and to assess trade-offs in wetland design and operation.
ECOLOGICAL ENGINEERING
(2024)
Article
Ecology
Prakash Singh Thapa, Hiromu Daimaru, Seiji Yanai
Summary: This study assessed the vegetation recovery and erosion condition in a landslide area in central Japan. The results show that the upper slope, where reforestation activities were implemented, has seen significant vegetation recovery and no significant erosion, while the lower slope lacks vegetation and has experienced continued erosion.
ECOLOGICAL ENGINEERING
(2024)
Article
Ecology
Mike Jerauld, Forrest Dierberg, Thomas DeBusk, Scott Jackson, Kevin Grace, John Juston
Summary: The Everglades Stormwater Treatment Areas (STAs) are constructed wetlands built to remove phosphorus (P) from agricultural and urban runoff in support of Everglades restoration. Research shows that the levels of calcium (Ca) and alkalinity (Alk) have an impact on phosphorus removal in these wetlands.
ECOLOGICAL ENGINEERING
(2024)
Article
Ecology
Kalindhi Larios, Stefan Gerber, Rafael Munoz-Carpena, Patrick Inglett, K. Ramesh Reddy, Michael Chimney
Summary: This study modeled the phosphorus biogeochemical dynamics in one of the best performing Everglades treatment wetlands and found that the complexity of the hydrological system significantly affected the simulated water column P concentration. The modeling tool developed in this study can guide future data collection and optimization efforts for treatment wetlands in the Everglades.
ECOLOGICAL ENGINEERING
(2024)
Article
Ecology
Jing Hu, Benjamin Baiser, R. Thomas James, K. Ramesh Reddy
Summary: This study examined the long-term phosphorus retention in Stormwater Treatment Areas (STAs) and identified the factors influencing their performance. The results showed that the operational performance of STAs improved over time. There were notable differences among individual STAs, with the co-precipitation of phosphorus with calcium playing a critical role in one of the STAs. This highlights the complexity of phosphorus removal in STAs and the need for site-specific management strategies.
ECOLOGICAL ENGINEERING
(2024)
Article
Ecology
Odi Villapando, K. R. Reddy, J. King
Summary: The biogeochemical response to different flow conditions within two parallel flow-ways in Everglades Stormwater Treatment Area (STA)-2 was studied. It was found that there was a gradual decrease in the total phosphorus (TP) concentration from inflow to outflow for both emergent aquatic vegetation (EAV) and submerged aquatic vegetation (SAV) dominated systems, with EAV showing a higher reduction rate. Significant increase in TP concentration was observed in the SAV system under no flow condition, possibly due to the production of particulate phosphorus (PP) through various mechanisms.
ECOLOGICAL ENGINEERING
(2024)