Article
Biotechnology & Applied Microbiology
Xuan Zheng, Xing Liu, Hang Yang, Lu Du, Xinxi Fu, Dandan Guo, Yonghua Chen
Summary: This study prepared macroporous zeolite balls (MZ) using the pore construction technique and investigated their influence on the structure and function of microbial community in tidal flow constructed wetlands (TFCWs). The results showed that MZ had a porous morphology and improved the removal rate of NH4+-N. BugBase phenotypic and FAPROTAX prediction results revealed that MZ had a wider ecological niche and supported the coexistence of aerobic and anaerobic bacteria on its surface. The key denitrification functional bacteria were identified as Massilia, Pseudarthrobacter, Hydrogenophaga, Acidovorax, and Pseudomonas. This study is beneficial for enhancing the purification efficiency of constructed wetlands.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2023)
Article
Biotechnology & Applied Microbiology
Xuan Cuong Nguyen, Quang Viet Ly, Jianxin Li, Hyokwan Bae, Xuan-Thanh Bui, Thi Thanh Huyen Nguyen, Quoc Ba Tran, Thi-Dieu-Hien Vo, Long D. Nghiem
Summary: Through data mining and machine learning models, it was found that six input features including ammonium, total nitrogen, hydraulic loading rate, filter height, aeration mode, and types of inlet feeding have significant influences on ammonium removal rate in subsurface constructed wetlands (SCW). The Cubist algorithm emerged as the optimal model with the highest predictive accuracy.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2021)
Article
Engineering, Environmental
Katherine Lizama-Allende, Jose Ayala, Ignacio Jaque, Pablo Echeverria
Summary: A laboratory-scale horizontal subsurface flow constructed wetland system was used to treat highly acidic, arsenic and metal-rich water. The system showed high efficiency in arsenic, iron, and lead removal throughout the experiment, with limestone recommended over zeolite as the wetland medium due to its pH adjustment capacity. Plant uptake had minimal contribution to pollutant removal.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Agronomy
Anita Jakubaszek
Summary: The study found that young plants in the rapid growth stage contain the highest levels of total nitrogen and total phosphorus, while the leaves of common reeds have a higher capacity for nitrogen phytoaccumulation. The surface layer of the filtration material in constructed wetland beds has the highest content of total nitrogen and total phosphorus, with accumulation decreasing with depth and outflow direction of sewage.
Article
Agricultural Engineering
Zhongshuo Xu, Wenwen Qiao, Xinshan Song, Yuhui Wang
Summary: The study showed that vertical flow constructed wetlands using natural pyrite as substrate can enhance nitrate removal efficiency and promote heterotrophic denitrification to avoid nitrite accumulation. Additionally, the growth of plants in wetlands, particularly Canna indica, was better in wetlands using pyrite as substrate. High-throughput sequencing revealed differences in denitrifying bacteria, iron oxidation and reduction microorganisms, and rhizosphere microorganisms in the wetlands.
BIORESOURCE TECHNOLOGY
(2021)
Review
Environmental Sciences
Hui Zhong, Ning Hu, Qinghua Wang, Yucheng Chen, Lei Huang
Summary: Constructed wetland is a cost-effective and environmentally friendly technology for contaminated water treatment. However, substrate clogging is a major challenge in its long-term operation. This study reviews the effects of substrates on clogging and provides recommendations for substrates that can alleviate clogging, aiming to enhance the stable operation and technical level of constructed wetlands.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Dandan Xu, Benhang Li, Xudan Dou, Li Feng, Liqiu Zhang, Yongze Liu
Summary: The study found that the final removal efficiency of SMX in the constructed wetland filled with Mn ore substrate (M-CW) was 48.4%, which was 39.6% higher than that in the constructed wetland filled with gravel substrate (G-CW). According to the mass balance calculation, the total loss of SMX in M-CW caused by oxidation and biodegradation accounted for 33.0% of the total input, while in G-CW, biodegradation accounted for 13.0% of the total input. The substrate adsorption in M-CW and G-CW accounted for 15.0% and 7.0% of the total input, respectively.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Guangming Xu, Yue Li, Weihao Hou, Sen Wang, Fanlong Kong
Summary: This study established four constructed wetlands (CWs) and found that using manganese ore substrate can increase the removal efficiency of COD, TN, TP and reduce greenhouse gas emissions, especially CH4 emissions. High-throughput sequencing results showed significant differences in microbial community diversity and richness among different substrates.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Review
Engineering, Environmental
Deepti Negi, Shelly Verma, Swati Singh, Achlesh Daverey, Jih-Gaw Lin
Summary: Constructed wetland is a sustainable eco-technology for remediation of contaminants, but its nitrogen removal efficiency is unsatisfactory. Anammox, an eco-friendly technology, can be integrated into constructed wetlands to overcome the shortcomings.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Environmental
Zihui Yao, Yongxiang Ren, Bin Li, Ge Bai, Siqi Zhao, Lei Yang, Yanbin Chi
Summary: Nitrogen loading directly affects plant metabolism, morphogenesis, and rhizosphere effect, thereby influencing the pollutant removal performance of constructed wetlands. Different nitrogen loading standards in design specifications around the world result in significant variations. This study investigated the physiological responses and pollutant removal characteristics of Canna indica under different nitrogen stresses (NSs) in subsurface flow constructed wetlands (SFCWs).
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Environmental Sciences
Yinuo Zhu, Lijuan Cui, Jing Li, Rumiao Wang, Jan Vymazal, Wei Li, Yinru Lei, Manyin Zhang, Ting Hao, Jiaming Wei
Summary: Constructed wetlands (CWs) are efficient technologies for wastewater treatment and water resource reuse. A study evaluating the performance of an integrated CW over ten years found consistent removal rates of TN and TP, with higher bacterial richness and diversity in summer and autumn. Microorganisms related to denitrification and dephosphorization played a significant role in the bacterial community, with Pseudomonas abundance positively correlated with TN and TP removal rates.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Agriculture, Multidisciplinary
Mercedes Guerrero-Brotons, Nuria Perujo, Anna M. Romani, Rosa Gomez
Summary: Proper bed substrate selection is crucial for the performance of constructed wetlands, especially when treating drainage water with high nitrogen and low carbon and phosphorus concentrations. In a field-scale pilot plant, adding a carbon-rich substrate such as soil or biochar increased phosphorus availability in beds. Beds with soil displayed higher microbial density and activity, as well as better plant growth compared to gravel. These findings highlight the importance of selecting suitable substrates for treating irrigated agricultural water.
AGRICULTURE ECOSYSTEMS & ENVIRONMENT
(2024)
Article
Engineering, Environmental
Jing Lu, Mingming Wang, Jun Wei, Lingwei Kong, Bin Yang, Gaoming Wu, Lecheng Lei, Zhongjian Li
Summary: An electrolysis-integrated constructed wetland using pyrite as filler was developed in this study. Synergistic effects of pyrite filler and electrolysis process were observed, leading to improved phosphorus and nitrogen removal. Additionally, acidification caused by water electrolysis inhibited nitrification process and desorption of phosphorus.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Xiangzheng Li, Lulu Zhou, Lin-Lan Zhuang, Jian Zhang, Mengting Li, Yanan Yang
Summary: In this study, partially unsaturated constructed wetlands (CWs) filled with biochar (C) and/or iron shavings (Fe) were proposed to improve the efficiency of ammonia oxidation and denitrification. The results showed that the addition of Fe-C combination significantly enhanced the removal of total nitrogen and total phosphorus compared to traditional CWs, while reducing the toxicity to plants.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Green & Sustainable Science & Technology
Rongzhen Wang, Xinwen Zhang, Shuya Yang, Zhenghe Xu, Chengye Feng, Fangxing Zhao
Summary: This study designed a novel hybrid constructed wetland with sulfur-siderite filler and drop aeration to enhance nitrogen removal. The results showed that the TN removal rate increased significantly, with sulfur autotrophic denitrification as the dominant pathway. Compounds generated during nitrogen removal acted as trace elements, promoting the growth of wetland plants.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Environmental Sciences
Duo Xu, Yan Xia, Zhaoxin Li, Yonggang Gu, Chunhua Lou, Hao Wang, Jinlong Han
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2020)
Article
Environmental Sciences
Hao Wang, Lei Zhang, Yang Tian, Yang Jia, Guozhu Bo, Litao Luo, Lin Liu, Guoyuan Shi, Fuping Li
Summary: The study found that the CW-MEF system can effectively degrade nitrobenzene and aniline in wastewater, with different power generation capacities in different stages. High-throughput sequencing analysis revealed differences in bacterial composition in different sludge layers.
Article
Environmental Sciences
Jia Wang, Zhinian Yang, Hao Wang, Shuangrong Wu, Huan Lu, Xingguo Wang
Summary: The study demonstrated that the novel Up-flow Blanket Filter (UBF) reactor showed efficient degradation of antibiotic wastewater, with the combined packing UBF reactor exhibiting the best removal efficiency and performance. The reactor fillers in the combined packing had better biofilm adhesion and abundant element components compared to other fillers.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Duo Xu, Hao Wang, Dongyun Han, Aiting Chen, Yunxia Niu
Summary: The study found that the thermal discharge from power plants led to an increase in water temperature in the reservoir, significantly impacting the structure of phytoplankton communities, especially during the cold season. The research also showed that the thermal effect caused an increase in the number of Bacillariophyta in the reservoir, and other environmental parameters were also affected.
ENVIRONMENTAL POLLUTION
(2021)
Article
Environmental Sciences
Jinlong Han, Yue Yin, Duo Xu, Hao Wang, Shuang Yu, Dongyun Han, Yunxia Niu, Runyu Xu
Summary: The experiment demonstrated that Vallisneria natans and Ceratophyllum demersum have nearly 100% inhibition effect on Microcystis aeruginosa, which can be reflected through oxidative damage analysis. Gas chromatography-mass spectrometry analysis revealed that secondary metabolites produced by V. natans and C. demersum can effectively inhibit M. aeruginosa.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Environmental Sciences
Hao Wang, Duo Xu, Jinlong Han, Runyu Xu, Dongyun Han
Summary: The experimental results showed that the co-system of subsurface flow constructed wetland and water-source heat pump achieved high removal efficiencies of pollutants, especially in COD, NH3-N, and TP. The optimal removal efficiency was achieved when the pH was 6-7.5 and hydraulic retention time was 4 days.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Yunxia Niu, Yue Yin, Runyu Xu, Zhinian Yang, Jia Wang, Duo Xu, Yue Yuan, Jinlong Han, Hao Wang
Summary: In this study, a stable Ti/SnO2-RuO2 anode was prepared successfully and used for the degradation of low concentration CFX using green and sustainable electrocatalytic oxidation technology. The effects of various parameters on the degradation efficiency were discussed, and the optimal conditions for CFX removal were identified. The electrochemical analysis and Fourier transform infrared spectroscopy provided insights into the degradation efficiency and process.
Article
Environmental Sciences
Chunpeng Leng, Yunxia Niu, Yunlong Zhou, Zhinian Yang, Yue Yuan, Fuping Li, Hao Wang
Summary: This study explored the removal of organic matter from wastewater using coated electrodes. The effects of varying current densities and pH in a low concentration range on the removal of organic substances, COD, and NH3-N were investigated. The results showed that the optimal removal efficiency of NH3-N and COD was achieved at an electric current density of 8-10 mA/cm(2), mild alkaline or neutral pH, and an electrolysis time of around 30 minutes. The preparation process of the coated electrode and the degradation mechanism of organic matter in wastewater were also investigated, with the titanium-based ruthenium coated electrode identified as the most suitable for practical application.
POLISH JOURNAL OF ENVIRONMENTAL STUDIES
(2022)
Article
Engineering, Chemical
Yunxia Niu, Zhinian Yang, Jia Wang, Yunlong Zhou, Hao Wang, Shuangrong Wu, Runyu Xu
Summary: This research investigated the use of two metal additives on a titanium substrate to create suitable coating materials for the degradation of PFOA in sewage. Three different compound materials were compared to determine their efficiency in removing PFOA under different electrolytic conditions. The Ti/SnO2-ZnO material was found to be the most suitable anode for this purpose. Various factors, including pH, current density, and initial concentration, were shown to affect the degradation efficiency. The stability of the electrode was also evaluated, and the degradation mechanism and pathways of PFOA were analyzed.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Engineering, Chemical
Runyu Xu, Zhinian Yang, Yunxia Niu, Duo Xu, Jia Wang, Jinlong Han, Hao Wang
Summary: In this study, the mixed pollutants of microplastics and heavy metals were effectively removed from the secondary effluent of a wastewater treatment plant using an interpenetrating bipolar plate electrocoagulation (IBPE) reactor. The experimental process showed high removal efficiency for both heavy metals and microplastics. The optimization of removal efficiency was achieved with specific current density, initial pH, and reaction time. Mathematical models and pseudo-voltammetry curve analysis provided insights into the changes in removal rate over time and the complexation forms of heavy metals and surface groups of microplastics. The results suggested that IBPE could be a valuable clean technology for simultaneously removing microplastics and heavy metals from wastewater.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Biotechnology & Applied Microbiology
Guangze Li, Huiyuan Zhong, Yong Yang, Li Zhu, Xiao Liu, Hao Wang
Summary: This paper studied the impact of modified kaolin on the dewatering performance of sludge and focused on the molecular composition and transformation of extracellular biological organic matter and supernatant dissolved organic matter during the conditioning process. The results showed that modified kaolin significantly improved the sludge dewatering performance by breaking the structure of sludge floc and promoting the release of bound water.
BIOCHEMICAL ENGINEERING JOURNAL
(2022)
Article
Environmental Sciences
Jinlong Han, Yufei Xu, Duo Xu, Yunxia Niu, Lei Li, Fuping Li, Zhaoxin Li, Hao Wang
Summary: The effects of reclaimed water containing ofloxacin (OFL) and ciprofloxacin (CIP) in antibiotics polluted natural soil (APNS) were investigated. The experiment showed that OFL and CIP were mainly adsorbed and degraded at 30 cm, and their concentration increased with depth due to desorption from APNS. Changes in replenishment water concentration significantly affected OFL and CIP in pore water and soil. Soil microorganisms selectively degraded OFL and CIP, with degradation rates of 45.48% and 42.39% respectively. This study provides a reference for future research on the migration of trace organic pollutants under natural conditions.
ENVIRONMENTAL RESEARCH
(2023)
Article
Environmental Sciences
Bin Wu, Duo Xu, Hao Wang, Runyu Xu, Naibing Qin, Jinlong Han
Summary: This study investigates the effect of adding wetland plant-derived biochar to constructed wetlands on the removal of Diclofenac (DFC). The results show that optimal removal is achieved at specific initial DFC concentration, pH, and hydraulic retention times. Additionally, the study reveals that DFC concentration influences the variation of microbial communities.
ENVIRONMENTAL RESEARCH
(2022)
Article
Biochemistry & Molecular Biology
Chunpeng Leng, Yonggang Yuan, Zhiyu Zhang, Qiushi Shi, Fuping Li, Hao Wang
Summary: A constructed wetland-coupled microbial fuel cell system was built to treat wastewater and generate electricity. The optimal phosphorus removal and electricity generation were determined by comparing different substrates, hydraulic retention times, and microorganisms. The mechanism of phosphorus removal was analyzed and it was found that adsorption and chemical reactions play a crucial role. The selection of electrode materials, matrix, and system structure should be considered to improve the power generation capacity and phosphorus removal in the system.
Article
Environmental Sciences
Jia Wang, Yonggang Gu, Hao Wang, Zhaoxin Li
Summary: This study investigates the feasibility of using the slope wetland system (SWs) to improve polluted river water. Results show that mixed fillers are more effective than gravel fillers in removing pollutants, with a 5% improvement in treatment indexes. Extended hydraulic retention time (HRT) is beneficial for pollutant removal in SWs. Analysis indicates that physical adsorption is the main form of pollution removal, and enrichment of microorganisms with dominant bacteria against polluted river water is observed in the device packing.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
