Review
Environmental Sciences
Rozi Sharma, Jan Vymazal, Piyush Malaviya
Summary: Floating treatment wetlands (FTWs) are gaining popularity for their ability to remediate wastewater, preserve ecosystem quality, and offer landscape conservation and aesthetic benefits. They can overcome technical challenges in stormwater treatment and enhance system efficiency through understanding hydraulics and other operational parameters.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Flory Mkangombe Kilingo, Zulu Bernard, Chen Hongbin
Summary: This study focuses on the domestic wastewater in the Kibera slum of Nairobi, investigating its characteristics, collection, and treatment. A low-cost sewage treatment technology combining natural plant coagulant and constructed wetland was proposed and tested, showing significant reduction in pollutant concentration and meeting the discharge standards.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(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
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
Engineering, Environmental
Yuying Jing, Martin Krauss, Simon Zschieschang, Anja Miltner, Andrii Butkovskyi, Trine Eggen, Matthias Kaestner, Karolina M. Nowak
Summary: This study investigated the use of superabsorbent polymer (SAP) as a supplement to constructed wetlands (CWs) for enhanced removal of hydrophilic pesticides. The results showed that SAP improved the retention of neutral pesticides in the gel-water phase of w-SAP, while also enhancing the removal of pesticides in lab-scale CWs contaminated by runoff water. Overall, the addition of SAP in CWs led to a significant increase in the removal efficiency of various pesticides, especially hydrophilic ones.
Article
Environmental Sciences
Xue Zhao, Yi Zheng, Feng Quan, Shiyao Hu, Qingping Wu, Meiyu Luo, Yang Gu, Sijie Tang, Jiping Jiang
Summary: This study reveals that road runoff can be a major pollution source of parabens and their metabolites in rapidly growing cities during the wet season. The concentrations in road runoff were comparable to those in treated wastewater and river water and showed a land use pattern of residential > industrial > commercial.
Article
Environmental Sciences
Wenxue Xu, Baoshan Yang, Hui Wang, Shuzhi Wang, Keqin Jiao, Chuanfeng Zhang, Feng Li, Haixia Wang
Summary: This study investigated the nutrient-removal capacity of four vertical-flow constructed wetlands (VFCWs) with different substrates and aeration conditions for synthetic wastewater. The results showed that intermittent aeration significantly enhanced pollutant removal efficiency. VFCW-4 with ceramsite substrate and aeration demonstrated great potential in removing NH4+-N, NO3--N, TN, and COD. The microbial diversity and structure varied with aeration and substrate conditions, and ceramsite substrate combined with intermittent aeration increased the abundance of Acidobacteria, which was conducive to the removal of organic matters.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Ecology
Lorena Aguilar, Leonardo M. Perez, Angel Gallegos, Eva Fores, Carlos A. Arias, Carme Bosch, Maria Verdum, Patricia Jove, Joan de Pablo, Jordi Morato
Summary: The wine industry produces a large amount of wastewater with high levels of organic matter and nutrients. This study used an innovative compact and mobile treatment wetland system with cork as the media to treat the wastewater from a winery. The results showed that intermittent induced aeration improved nitrogen compound removal and stimulated the growth of denitrifying bacteria in the wetland system.
ECOLOGICAL ENGINEERING
(2022)
Article
Agricultural Engineering
Abhishek Soti, Saurabh Singh, Vishesh Verma, Niha Mohan Kulshreshtha, Urmila Brighu, Pradip Kalbar, Akhilendra Bhushan Gupta
Summary: The requirement of large land area limits the adoption of constructed wetlands (CWs) in urban settings with limited land availability. The area calculations for CW design are commonly carried out following Kikuth approach where the removal rate constant (K) is derived from literature. Investigation of secondary data of 82 vertical flow CWs, performed in this study, revealed wide variations in the calculated K values for different pollutants under different environmental and operational conditions, highlighting the importance of incorporating desired pollutant removal levels into customized CW design.
BIORESOURCE TECHNOLOGY
(2022)
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
Environmental Sciences
Md Nuruzzaman, A. H. M. Faisal Anwar, Ranjan Sarukkalige
Summary: The effectiveness of floating treatment wetland (FTW) for metal removal is influenced by nutrient availability in the water, according to a study. The research found that the metal uptake rates of plants in nutrient-rich lake water were slower compared to nutrient-deficient tap water.
Article
Environmental Sciences
Hanhan Huang, Ming Li, Yuanhong Zhou, Jing Zhang, Xinjie Jin, Jian Chen
Summary: This study focused on the common urban greening tree species E. japonicus var. aureamarginatus in the Yangtze River Delta. It found that the tree exhibited some recovery ability during the secondary pollution period, with increased chlorophyll levels, slower degradation of carotenoid, faster accumulation of ASA, lower accumulation of MDA, and reduced activity of SOD. This suggests that plants may develop memory and resistance to recurrent exhaust pollution.
ENVIRONMENTAL POLLUTION
(2023)
Article
Environmental Sciences
A. H. M. Enamul Kabir, Masahiko Sekine, Tsuyoshi Imai, Koichi Yamamoto, Ariyo Kanno, Takaya Higuchi
Summary: This study investigated microplastics pollution in rivers in Yamaguchi Prefecture, Japan, with small-scale rivers found to be highly polluted compared to others around the world.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Linnea Saby, R. Seth Herbst, Jonathan L. Goodall, Jacob D. Nelson, Teresa B. Culver, Emma Stephens, Caroline M. Marquis, Lawrence E. Band
Summary: Nonpoint source (NPS) water quality trading is a market-based approach to improving water quality, but it can increase localized pollutant loadings, especially in rural areas. Virginia's NPS WQT program has enabled thousands of transactions, but its impacts on urban water quality have not been thoroughly assessed. Through simulation, we found that NPS WQT increased phosphorus loading in an urban catchment, especially during years with greater rainfall. In a policy alternative where buyers and sellers are collocated in the catchment, the phosphorus increase from development was completely offset, indicating undervaluation of credits for urban mitigation practices.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Engineering, Environmental
Erika Olson, Christina L. M. Hargiss, Jack Norland
Summary: Little is known about the spatial and temporal changes of Escherichia coli in urban stormwater systems. This project aimed to assess E. coli in urban stormwater detention basins and retention ponds using microbial source tracking (MST). Results showed higher levels of E. coli during rain events in both detention basins and retention ponds.
WATER ENVIRONMENT RESEARCH
(2022)