Article
Engineering, Environmental
Olga P. Koutsou, Michail S. Fountoulakis, Christos Matsoukas, Nikolaos M. Fyllas, Athanasios S. Stasinakis
Summary: This study investigated the factors affecting N2O emissions from constructed wetlands and developed a statistical formula to estimate N2O emission factors (EFs). The application of the formula to Greek settlements predicted a significant reduction in N2O emissions if constructed wetlands were used instead of conventional wastewater treatment plants.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Engineering, Environmental
Yingmu Wang, Shikang Xie, Jian Zhou, Gongduan Fan, Lei He, Xing Fan, Shi Chen, Jun Yang, Junge Xu, Qiang He
Summary: This study developed three electrochemically integrated horizontal flow constructed wetlands (E-HFCWs) for nutrients removal from wastewater treatment plants (WWTPs) effluent with different S/N ratios. The results showed that the removal percentages of PO43-, NO3--N and TN did not differ significantly as S/N ratios altered. The sulfur cycle played a crucial role in improving nitrogen removal stability in E-HFCWs. Furthermore, the higher S/N ratio groups allowed significantly lower N2O accumulation, which was in line with the concept of carbon neutral. Metagenome analysis demonstrated the significant role of sulfur cycle in stable autotrophic denitrification performance in E-HFCWs.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Environmental Sciences
Junyu Huo, Xiaojin Hu, Shiyi Cheng, Huijun Xie, Zhen Hu, Haiming Wu, Shuang Liang
Summary: This study found that biochar, zeolite, and pyrite were more effective substrates compared to traditional gravel for improving nitrogen removal efficiency and reducing N2O emissions in constructed wetlands.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Engineering, Chemical
Songsong Chen, Yuncai Wang, Limin Ma
Summary: This study investigates the carbon and nitrogen isotope fractionation characteristics during the degradation of atrazine in a constructed wetland. The observed isotope parameters are consistent with those observed in the cultivation of specific strains, indicating similarities in the biodegradation pathway and mechanism. However, variations in carbon and nitrogen isotope fractionation across different phases may lead to over- or underestimation of atrazine biodegradation extent. The accuracy of estimation improves when using the enrichment factor derived from batch cultivation of pore water. This study advances the application of compound-specific stable isotope analysis in tracking atrazine biodegradation in ecosystems, emphasizing the importance of carefully selecting and applying the enrichment factor for quantifying intrinsic biodegradation.
Article
Environmental Sciences
Yuanyuan Liu, Min Xi, Yue Li, Ziwei Cheng, Sen Wang, Fanlong Kong
Summary: The study found that pretreating iris roots with SA and Ca2+ can enhance salt tolerance and improve the efficiency of CWs in treating saline wastewater. This treatment led to increased growth, photosynthetic pigments, Pro content, enzyme activities, and K+ content in the iris plant. RNA-seq analysis showed up-regulation of various genes related to hormone signaling, potassium ion transport, oxidative stress, and photosynthesis after pretreatment.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Article
Environmental Sciences
Hui Zhu, Xiangfei Yu, Yingying Xu, Baixing Yan, Gary Banuelos, Brian Shutes, Zhidan Wen
Summary: The study found that the macrophyte species Canna indica outperformed other species for CP and TCP removal in SSBCWs. Mass balance calculation revealed the fate of CP in SSBCWs, primarily being residue in water, alkaline hydrolysis, microbial degradation, substrate adsorption, and macrophyte uptake. The addition of Fe-C increased CP removal percentage and decreased TCP concentration in the effluent.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Biotechnology & Applied Microbiology
Songsong Chen, Limin Ma, Guodong Yao, Yuncai Wang
Summary: This study demonstrated the effectiveness of using a mixed culture of atrazine-degrading bacteria to improve atrazine removal in constructed wetlands. The results showed that atrazine was primarily degraded through a hydrolysis pathway mediated by microorganisms. Stable isotope analysis supported the findings, showing that 90% of atrazine was removed biologically.
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
(2023)
Article
Engineering, Environmental
Xiangyu Yang, Fucheng Guo, Tao Liu, Qiang He, Jan Vymazal, Yi Chen
Summary: This study investigated the impacts of engineered nanomaterials (ENMs) on ammonia-oxidizing microorganisms (AOMs) in constructed wetlands (CWs). It was found that the abundance and contribution of AOA increased under exposure to ENMs, but AOB remained the primary executant of ammoxidation.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Environmental Sciences
Salvador Sanchez-Carrillo, Jaime Garatuza-Payan, Raquel Sanchez-Andres, Francisco J. Cervantes, Maria Carmen Bartolome, Martin Merino-Ibarra, Frederic Thalasso
Summary: Varied methane production and emissions in mangroves can be explained by methane inhibition and oxidation. This study in mangrove forests affected by shrimp farm disturbance found that an increase in refractory organic matter shifted the main methanogenesis pathway to CO2 reduction. Isotope-mass balance approach revealed that methane was mainly oxidized through anaerobic oxidation of methane coupled to sulfate reduction.
Article
Green & Sustainable Science & Technology
Manping Zhang, Jung-Chen Huang, Shanshan Sun, Muhammad Muneeb Ur Rehman, Shengbing He, Weili Zhou
Summary: The study explored potential solutions to the deteriorating water quality in the Yangtze River estuary, and found that the use of tidal wetland mesocosms can improve nitrogen removal performance and greenhouse gas emissions, particularly through the contribution of nitrification. The results provide a sustainable solution to the water pollution problem in the Yangtze River estuary.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Water Resources
Spencer J. Chad, S. Lee Barbour, Jeffrey J. McDonnell, John J. Gibson
Summary: This study was conducted in the Athabasca Oil Sands Region in Canada, with a focus on establishing inventories of site-wide water isotope signatures and developing a conceptual model for understanding temporal variations in the water balance. The study provides foundational evidence for monitoring and improving industrial water use efficiency and management.
JOURNAL OF HYDROLOGY-REGIONAL STUDIES
(2022)
Article
Environmental Sciences
Lei Huang, Haifeng Xiong, Chunli Jiang, Jinke He, Wanlin Lyu, Yucheng Chen
Summary: Constructed wetlands (CWs) with biochar addition showed enhanced removal rates for NH4+-N, total nitrogen, and chemical oxygen demand, while reducing N2O emissions. Nitrous oxide (N2O) emission was mainly contributed by nitrification, denitrification, and simultaneous nitrification and denitrification processes. Adding biochar resulted in significant reduction rates for these processes. The relative abundance of nitrogen-transforming microbes increased after biochar addition, promoting nitrogen removal and reducing N2O emissions. Functional gene copy number and enzyme activity responsible for nitrogen conversion were increased with biochar addition, facilitating efficient NH4+-N oxidation and nitrite elimination, thus reducing N2O emissions.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Environmental Sciences
Keryn Roberts, Michael Grace, Perran Cook, Dirk Erler, Wei Wen Wong
Summary: The effectiveness of nitrogen removal in wetlands depends on biological processes. Isotopic fractionation factors were measured to evaluate nitrogen transformation processes in two urban water treatment wetlands. Differences in sampling conditions, such as rainfall patterns and light availability, affected the removal capability of the wetlands. Nitrate removal was influenced by overall nutrient inputs, residence time, and water temperature.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Forestry
Yi Jia, Guanghui Lv, Hailili Guligena, Li Qin, Zhengbing Peng, Ruxianguli Abudureheman, Ruibo Zhang
Summary: This study found significant correlations between the stable carbon isotopes (d(13)C) in Larix sibirica and Picea schrenkiana tree rings and climate factors. Relative humidity had a greater impact on stable carbon isotopes fractionation in Larix sibirica, while temperature, precipitation, and other factors had a more complex influence on Picea schrenkiana. This research is important for understanding past and future climate change, developing effective mitigation and adaptation strategies, and informing forest management in arid regions.
Article
Ecology
Khaled Amiri, Naceur Eddine Bekkari, Abd Errezak Debbakh, Warda Chaib
Summary: This study aims to compare the evapotranspiration rates in two experimental vertical flow subsurface constructed wetlands and provides the crop coefficient for different macrophytes. The results show that the planted lysimeters have higher cumulative ET values compared to unplanted ones, and the P. australis bed has higher accumulated ET values than the T. latifolia bed.
ECOHYDROLOGY & HYDROBIOLOGY
(2022)
Article
Engineering, Environmental
Hongjie Zhu, Zhihao Chen, Youyou Hu, Lingxuan Gong, Dandan Li, Zhengkui Li
JOURNAL OF HAZARDOUS MATERIALS
(2020)
Article
Environmental Sciences
Bangjing Ding, Wenqi Luo, Yunbin Qin, Zhengkui Li
SCIENCE OF THE TOTAL ENVIRONMENT
(2020)
Article
Environmental Sciences
Yunbin Qin, Zhihao Chen, Bangjing Ding, Zhengkui Li
ENVIRONMENTAL POLLUTION
(2020)
Article
Engineering, Environmental
Hongjie Zhu, Lingxuan Gong, Zhihao Chen, Youyou Hu, Zhengkui Li
JOURNAL OF HAZARDOUS MATERIALS
(2020)
Article
Environmental Sciences
Bangjing Ding, Hui Zhang, Wenqi Luo, Siyu Sun, Fan Cheng, Zhengkui Li
Summary: The study investigated the distribution of nitrogen loss pathways in different layers of paddy soil in southeastern China, revealing differences in the activities of anammox and Feammox in different soil layers. Denitrification was identified as the main nitrogen loss pathway in the surface soil, while Feammox became significant in the 20-40 cm depth.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Engineering, Environmental
Siyu Sun, Youyou Hu, Mengshan Xu, Fan Cheng, Hui Zhang, Zhengkui Li
Summary: Metal-organic frameworks have been widely used as photocatalytic materials. A novel photocatalyst HSO3-MIL-53(Fe) was successfully synthesized in this study and applied for the removal of CBZ and IBP, showing significant enhancement in photocatalytic efficiency under alkaline conditions.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Agricultural Engineering
Fan Cheng, Hui Zhang, Siyu Sun, Zhengkui Li
Summary: A two-chamber microbial photoelectrochemical cell (MPEC) with a denitrification biocathode and an alpha-Fe2O3/P3HT photoanode was established for nitrate removal from low carbon sources wastewater and simultaneous ibuprofen degradation. The results showed that the average NO3--N removal in the biocathode reached 96.56% when the COD/NO3--N was 0.75. Heterotrophic and autotrophic denitrification contributed 21.47% and 78.53% respectively. High-throughput sequencing revealed the dominance of Bacillus, Thermomonas, and Hydrogenophaga bacteria in the cooperative denitrification biocathode. Functional gene analysis showed the highest abundance of denitrification-related genes in the cooperative denitrification biocathode. The photocatalytic degradation efficiency of ibuprofen in the anode chamber was 67.95%.
BIORESOURCE TECHNOLOGY
(2022)
Article
Environmental Sciences
Youyou Hu, Siyu Sun, Mengshan Xu, Jialin Guo, Zhengkui Li
Summary: Through a series of experiments, it was found that the addition of pyridine organic ligands can improve the catalytic activity and accelerate the oxidation of sulfamethoxazole (SMX) in the peroxymonosulfate (PMS) system. The enhanced effect is attributed to the highly oxidative intermediate manganese species (Mn(V)). The oxygen transfer oxidation pathway and N radical coupling pathway both contribute significantly to the oxidation of SMX. This research provides insights into the formation of high-valent manganese species and offers a potential strategy for using low-concentration Mn(II) in wastewater treatment.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Youyou Hu, Siyu Sun, Jialin Guo, Fan Cheng, Zhengkui Li
Summary: A low-cost catalyst, PMCN, is developed using an in situ anchoring strategy for peroxymonosulfate (PMS) activation in environmental remediation. PMCN exhibits high PMS adsorption and sulfamethoxazole (SMX) removal efficiency. The study proposes a dual nonradical pathway dominated by high-valent manganese oxygen species and electron transfer. PMCN also shows excellent pH anti-interference ability and good reusability.
Article
Environmental Sciences
Bangjing Ding, Zhengkui Li, Miaomiao Cai, Mingzhu Lu, Wenzhi Liu
Summary: This study investigated the seasonal activities of anammox and Feammox in farmland soils and found that Feammox contributed more to anaerobic NH4+ loss than anammox. The factors controlling these processes include N availability, soil moisture content, and iron ion concentration.
Article
Environmental Sciences
Hui Zhang, Fan Cheng, Siyu Sun, Zhengkui Li
Summary: The distribution and diversity of comammox microbial community in different ecosystems were investigated in this study, revealing higher abundance in summer and farmland soils. The study also found a negative correlation between the abundance of comammox A and pH and NH4+ concentration.
ENVIRONMENTAL RESEARCH
(2022)
Article
Environmental Sciences
Yuecheng She, Xin Qi, Xiaodong Xin, Yanqing He, Wei Wang, Zhengkui Li
Summary: Microbial mechanisms play a crucial role in nitrate reduction in sediments of aquaculture ponds, with denitrification being the dominant process. The activities and composition of microbial communities in aquaculture ponds are influenced by the availability of carbon and nitrogen substrates, while autotrophic denitrifiers control the microbial network in natural freshwater sediments.
ENVIRONMENTAL RESEARCH
(2023)
Article
Green & Sustainable Science & Technology
Wei Wang, Youyou Hu, Xin Qi, Yanqing He, Yuecheng She, Zhengkui Li
Summary: This study analyzed the molecular biological mechanisms of Feammox and NDFO in the iron-nitrogen cycle, as well as the endogenous and exogenous factors affecting nitrogen removal. The results showed that the changes in nitrogen cycle function genes were synchronized with the changes in microbial genera. Optimizing environmental factors such as pH, organic carbon, and extracellular electron shuttles improved nitrogen removal efficiency. This research provides a new perspective and practical support for nitrogen pollution removal in natural ecosystems or wastewater treatment systems.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Environmental Sciences
Yanqing He, Yuecheng She, Xin Qi, Hui Zhang, Wei Wang, Zhengkui Li
Summary: This study investigated the distribution and diversity of comammox Nitrospira in riparian wetland ecosystems around Taihu Lake. The results showed that the community structure of comammox Nitrospira exhibited spatial and temporal heterogeneity, and total carbon and pH were the main environmental factors driving niche differentiation between comammox Nitrospira and canonical nitrifiers. In conclusion, three ammonia oxidizers were widely distributed in riparian wetland ecosystems around Taihu Lake, with canonical nitrifiers being more competitive and comammox Nitrospira preferring oligotrophic conditions.
JOURNAL OF SOILS AND SEDIMENTS
(2023)
Article
Chemistry, Applied
Wei Xiao, Peiyi Shi, Zhengkui Li, Chong Xie, Jian Qin, Huijuan Yang, Jingjing Wang, Wenbin Li, Jiujun Zhang, Xifei Li
Summary: By diluting high-concentration ether electrolytes with a non-solvating fluorinated ether, the research team successfully regulated the formation/evolution of solid electrolyte interphases (SEI) on phosphorus/carbon (P/C) anodes. This resulted in improved electrode performance, including reversible capacity, capacity retention rate, and rate capability. This research provides important insights for the development of high-performance potassium-ion batteries.
JOURNAL OF ENERGY CHEMISTRY
(2023)