Article
Engineering, Environmental
Xiangyu Yang, Qiang He, Fucheng Guo, Xiaohui Sun, Junmao Zhang, Yi Chen
Summary: The study found that while CBNs have minimal impacts on the removal of chemical oxygen demand and total phosphorus, they significantly affect nitrogen removal efficiency; among different CBNs, multi-walled carbon nanotubes have the greatest impact on nitrogen removal; CBNs also induce excessive production of reactive oxygen species, confirming their biotoxic effects on wastewater treatment systems.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Ecology
Yumei Luo, Quan Chen, Fan Liu, Can Dai
Summary: This study found that the diversity of plant communities in constructed wetlands is closely related to plant growth and nutrient removal capacity. Plant communities with diverse growth forms showed higher removal capacity for nitrogen and phosphorus, while monocultures or combinations of the same type of plant did not perform as well. Plant roots played a crucial role in nutrient consumption. Large plants showed a greater increase in biomass in polyculture environments, which greatly enhanced the absorption and assimilation of nitrogen and phosphorus.
FRONTIERS IN ECOLOGY AND EVOLUTION
(2023)
Article
Environmental Sciences
Yuru Wang, Zhenxin Shang, Wei Lan, Shuang Liang, Xinsheng Kang, Zhen Hu
Summary: This study used peat and intermittent aeration to enhance nitrogen removal efficiency in magnesia-containing constructed wetlands, resulting in improved plant growth and microbial abundance, and reduced global warming potential.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Environmental Sciences
Jucimara Andreza Rigotti, Joana Postal Paqualini, Lucia Ribeiro Rodrigues
Summary: Constructed floating wetlands are widely used globally for water treatment and quality improvement. This study found that Typha domingensis showed superior root growth compared to Schoenoplectus californicus in a floating structure without growth substrates. Additionally, the adaptation of both species to the floating structure was successful, with Typha domingensis demonstrating higher nutrient removal efficiency in the final synthetic effluent solution. The establishment period of the macrophytes varied between species and played a significant role in increasing nutrient removal rates and root growth.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Agricultural Engineering
Xiaoying Mu, Songhe Zhang, Xin Lv, Yu Ma, Ziqiu Zhang, Bing Han
Summary: The impacts of water flow and low temperature on nutrient removal in constructed wetlands are complex and temperature and water flow have different effects on water quality nutrient removal. Co-occurrence network analysis revealed changes in microbial community composition.
BIORESOURCE TECHNOLOGY
(2021)
Article
Environmental Sciences
Juan Xu, Xinxing Huang, Pei Luo, Miaomiao Zhang, Feng Liu, Runlin Xiao, Jinshui Wu
Summary: This study investigated the effects of aquatic macrophyte debris on nitrogen removal and microbial communities in constructed wetlands. The addition of plant debris did not change the average removal efficiency of ammonium (NH4+-N) and total nitrogen (TN), but showed significant differences over time. The decomposition of plant debris released NH4+-N and organic nitrogen, which affected nitrogen removal and increased denitrification activities.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Ecology
Valentina Carrillo, Yannay Casas-Ledon, Patricio Neumann, Gladys Vidal
Summary: This study examines the impact of different plant culture systems and seasonal variations on constructed wetlands. The results show that polycultures in wetlands reduce nutrient input, but have a greater global warming impact compared to monocultures. Seasonality also affects environmental performance, with better results observed in the cold season. These findings provide valuable insights for improving environmental performance and developing strategies for constructed wetlands.
ECOLOGICAL ENGINEERING
(2023)
Article
Engineering, Environmental
Yifei Wang, Dongpeng Li, Xinshan Song, Xin Cao, Chenteng Gao, Zhongshuo Xu, Wei Huang, Yuhui Wang
Summary: This study investigates the enhancement of nitrogen removal by using a manganese-carbon carrier in conjunction with biological denitrification. The results show that the use of manganese-amended constructed wetlands significantly improves the removal efficiency of total nitrogen and phosphorus. This is achieved by the direct reduction of nitrate by manganese and the generation of inorganic electron donors for denitrification. Furthermore, the addition of manganese-containing substrates alters the microbial community structure and improves electron utilization.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Environmental Sciences
Shaoyong Lu, Tao Zou, Pan Qin, Xuan Zhang, Guoqiang Wang, Yuchun Qin, Quan Wang
Summary: This study investigated the removal effect and mechanism of dichlorvos (DDVP) in lab-scale vertical flow constructed wetlands (VFCWs). The results showed that VFCWs can remove DDVP with an average removal efficiency of 94%-95% in long-term operation. In addition, VFCWs also exhibited significant removal efficiency for soluble phosphate (SRP) and total phosphorus (TP) at 48.60%-64.10% average removal efficiency, and the presence of DDVP enhanced the nitrogen removal effect of CWs. High-throughput sequencing and proteomic analysis revealed the microbial and plant root proteins involved in the removal process of DDVP in VFCWs. Overall, the use of VFCWs for treating organic phosphate wastewater shows promising prospects.
Article
Engineering, Environmental
Xu Zhang, Peixun Guo, Xiaotong Yang, Xingjie Yao, Haibing Cong, Bing Xu
Summary: Improper disposal of abandoned plant materials and wastewaters with a low C/N ratio can lead to environmental issues. The utilization of plant materials as external carbon sources in constructed wetlands (CWs) shows promise in recovering plant resources and promoting nitrogen removal in wastewater treatment. This research investigated three types of deciduous leaves and found that they effectively released organic carbon and enhanced nitrogen removal in CWs. The findings suggest that using abandoned plant materials as external carbon sources in CWs has tremendous application potential and can significantly improve nitrogen removal efficiency.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Environmental Sciences
Siqi Gao, Yanyu Song, Changchun Song, Xianwei Wang, Chao Gong, Xiuyan Ma, Jinli Gao, Xiaofeng Cheng, Yu Du
Summary: Peatlands, as a carbon and nitrogen pool in the world, are highly sensitive to environmental changes. This study examined the effects of nitrogen addition on the growth characteristics, community structure, and nutrient dynamics of peatland plants in a permafrost area. The results showed that nitrogen addition could affect the plant community structure by influencing plant growth characteristics. Furthermore, long-term nitrogen addition could alleviate nitrogen limitation to some extent but exacerbate phosphorus limitation.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Ecology
V. Carrillo, G. Gomez, G. Vidal
Summary: In this study, phosphorus uptake by common and ornamental plants in pilot-scale horizontal subsurface flow constructed wetlands (CWs) with monocultures and polycultures was investigated. The results showed that the cold season had better performance, with higher phosphorus uptake by ornamental plants in the polyculture.
ECOLOGICAL ENGINEERING
(2022)
Article
Agricultural Engineering
Tongtong Zhou, Jiangong Liu, Zhiyang Lie, Derrick Y. F. Lai
Summary: This study investigated the effects of different carbon substrates on the treatment efficiency of hydroponic wastewater using vertical flow constructed wetlands. The addition of sucrose and common reed litter improved the removal of nitrogen and phosphate, and the common reed litter also reduced the emission of greenhouse gases.
BIORESOURCE TECHNOLOGY
(2022)
Article
Engineering, Environmental
Ruigang Wang, Xin Zhao, Tiecheng Wang, Zizhang Guo, Zhen Hu, Jian Zhang, Shubiao Wu, Haiming Wu
Summary: The utilization of natural ores and mine waste as substrate in constructed wetlands can enhance nutrient removal performance. However, the potential negative environmental effects of contaminants leached from mine waste are not well understood. This study investigated the long-term feasibility and key removal mechanisms of different constructed wetlands using three types of mine waste as substrates. The results showed that the addition of mine waste increased the removal of total phosphorus and total nitrogen. The higher removal of phosphorus is mainly attributed to the strong binding mechanism of phosphate with the leached oxides and hydroxides of manganese, iron, and/or aluminum. Moreover, the integration of mine waste in constructed wetlands stimulated biofilm establishment and enriched the relative abundance of key functional genes related to the nitrogen cycle.
Article
Environmental Sciences
Yuannan Long, Zhenyu Zhou, Xiaofeng Wen, Jianwu Wang, Ruihao Xiao, Wenming Wang, Xiwei Li, Xu Lai, You Zhang, Chaoping Deng, Jinsong Cao, Lingshi Yin
Summary: This study investigated the removal of microplastics (MPs) in a constructed wetland wastewater treatment plant (WWTP) in Changsha. The results showed that the MPs removal efficiency was highest in the primary treatment stage. The combination of bio-pond and constructed wetland reduced the MPs removal efficiency. The most common shape and type of MPs in the wastewater were fibers, polyethylene, and polystyrene.
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)