Article
Green & Sustainable Science & Technology
Clement D. D. Sohoulande, Ariel A. A. Szogi, Jeffrey M. M. Novak, Kenneth C. C. Stone, Jerry H. H. Martin, Don W. W. Watts
Summary: Surface runoff in agricultural watersheds can lead to nitrogen and phosphorus losses from croplands into streams, significantly affecting stream water quality. Instream-constructed wetlands (ICWs) are a low-cost alternative for treating runoff water, but their long-term hydrologic behavior is insufficiently understood. This study used a model to simulate the hydrologic behavior of an experimental ICW and found that precipitation variability has contrasting effects on nitrogen and phosphorus outflows.
Article
Environmental Sciences
Catherine Sullivan, Walter McDonald
Summary: Subsurface gravel wetlands are a type of emerging green infrastructure that effectively manages stormwater by capturing and slowly releasing runoff. This study evaluated the efficiency of a subsurface gravel wetland in treating stormwater with varying pollutant inputs. The results showed significant reductions in volume and peak flow, although nutrient concentrations increased in some cases.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Engineering, Environmental
Jinhui Zhao, Lisha Shu, Mengke Wu, Jiabi Han, Shuyu Luo, Jixian Tang
Summary: Urban waterlogging and poor water quality caused by stormwater runoff are growing problems. A combined permeable concrete pavement and constructed wetland system was developed to treat and reuse stormwater runoff. The system achieved high removal rates for suspended solids, but the effluent did not meet the standards for rainwater reuse in terms of chemical oxygen demand, total nitrogen, and total phosphorus concentrations. Further optimization of aeration in the wetland allowed the system to meet the standards for stormwater reuse.
WATER SCIENCE AND TECHNOLOGY
(2023)
Article
Environmental Sciences
Linh Hoang, James P. S. Sukias, Valerio Montemezzani, Chris C. Tanner
Summary: Nitrogen loading from diffuse agricultural sources is a major water-quality problem worldwide. Constructed wetlands have proven to be effective in treating runoff and drainage from agricultural lands. This study used a catchment-wetland modelling approach to estimate and quantify the nitrogen input loads into a wetland and evaluate its removal efficiency. The results showed that the Owl Farm constructed wetland had a high capacity for nitrate-N removal, with an average removal rate of 61%. However, the efficiency varied with the inflow from the catchment, with higher removal rates during low-flow periods and slightly lower rates during high-flow periods.
Article
Ecology
Rebecca Stott, James P. S. Sukias, Lucy A. McKergow, Robert J. Davies-Colley, Chris C. Tanner
Summary: Monitoring of a constructed wetland receiving episodic pulses of subsurface drainage waters from grazed dairy pastures showed good nitrogen reductions, but moderate increases in median Escherichia coli concentrations. However, intensive monitoring during storm events revealed that the wetland consistently exported E. coli, indicating potential health risks from diffuse agricultural drainage after passage through wetlands.
ECOLOGICAL ENGINEERING
(2023)
Article
Environmental Sciences
Shuting Shen, Zhuofan Geng, Xiang Li, Xiwu Lu
Summary: This study investigated the conversion and removal of different forms of phosphorus (P) in floating treatment wetlands (FTWs). The results showed that the combination of substrate and plants provided stable and efficient phosphorus removal performance in high P conditions, while living plants were important for P removal in low P conditions. Plants promoted the removal of non-reactive P through specific rhizosphere microbial communities.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Zheqi Pan, Minpeng Hu, Hong Shen, Hao Wu, Jia Zhou, Kaibin Wu, Dingjiang Chen
Summary: Increasing evidence suggests that groundwater can contain high dissolved phosphorus concentrations, contributing to potential pollution of surface waters. This study quantified contributions from different sources to riverine phosphorus pollution in an agricultural watershed in eastern China. The study found that groundwater could be a significant source of phosphorus pollution to rivers, emphasizing the importance of controlling groundwater pollution from agricultural lands.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Review
Biotechnology & Applied Microbiology
Yuvaraj Ravikumar, Junhua Yun, Guoyan Zhang, Hossain M. Zabed, Xianghui Qi
Summary: Non-Point Source (NPS) pollution is a critical global problem, leading to excessive supply of organic and inorganic pollutants and changing water quality. Constructed wetlands (CWs) have been gaining attention for their potential in mitigating pharmaceutical contaminants (PCs) in soil and water reservoirs. This paper summarizes the sources, occurrence, fate, and ecotoxicological effects of PCs derived from NPS pollution, discusses the significance of plants and other factors in CWs for efficient removal of PCs, and emphasizes the need for future research to improve the application of CWs.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2022)
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
Ecology
Brad A. Gordon, Christian Lenhart, Heidi Peterson, Joshua Gamble, John Nieber, Dean Current, Ashley Brenke
Summary: The study found that the small wetland received an average of 12.6 m of drainage water, 185 kg of nitrate-nitrogen, and 1.3 kg of total phosphorus annually, and removed 67% of input nitrate-nitrogen over four years. Most nitrate-nitrogen was removed in shallow groundwater flow after infiltration, while phosphorus removal through vegetation harvest was the primary means of removal.
ECOLOGICAL ENGINEERING
(2021)
Article
Environmental Sciences
Fenglin Jin, Zhen Hu, Huaqing Liu, Jixin Su, Jian Zhang, Shuo Wang, Yanhui Zhao
Summary: Substrate clogging is a major challenge in the operation of subsurface flow constructed wetlands (SSF-CWs). This study investigated the impact of substrate clogging on phosphorus (P) accumulation behavior in SSF-CWs. Results showed that increasing clogging degree led to reduced P removal efficiency at low clogging degree, but higher P removal efficiency at high clogging degree. Substrate adsorption was the primary removal pathway in all SSF-CW systems, with higher Fe/Al-P accumulation on the substrate in the highly clogged system.
Article
Ecology
Keit Kill, Linda Grinberga, Jari Koskiaho, Uelo Mander, Outi Wahlroos, Didzis Lauva, Jaan Parn, Kuno Kasak
Summary: With population growth and increased demand for agricultural products, the impact on agriculture, fertilizer use, and land management has become evident. To mitigate the deteriorating water quality in rivers and lakes near agricultural lands, constructed wetlands have been utilized for natural water treatment processes. A study conducted in Finland, Estonia, and Latvia revealed vegetation coverage as the most influential factor in the treatment efficiency of in-stream constructed wetlands.
ECOLOGICAL ENGINEERING
(2022)
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
Ecology
Thivanka Dharmasena, Lloyd H. C. Chua, Natalie Barron, Hongkui Zhang
Summary: By combining sampling and modeling in the constructed wetland in Armstrong Creek, Geelong, the annual pollutant treatment levels can be accurately identified. This approach offers a cost-effective method for evaluating wetland performance based on annual treatment levels.
ECOLOGICAL ENGINEERING
(2021)
Article
Engineering, Environmental
Yanhua Zhuang, Weijia Wen, Shuhe Ruan, Fuzhen Zhuang, Biqing Xia, Sisi Li, Hongbin Liu, Yun Du, Liang Zhang
Summary: This study proposes a real-time measurement method for total nitrogen (TN) by combining sensor detection and intelligent algorithms. The method achieves a monitoring frequency at the minute scale and shows stable data acquisition, high precision, and high monitoring frequency. The method performs well in similar environmental conditions and can still provide acceptable prediction accuracy even with partial variable missing.
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)