Review
Engineering, Environmental
Ruth Stephenson, Craig Sheridan
Summary: Accurate modelling of constructed wetlands is crucial for their effective use in wastewater treatment. The modelling technique used depends on the goal of the model, and the time contaminants spend in the system is highly dependent on the hydraulic behaviour of the wetland, which can be quantified through tracer studies.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Article
Engineering, Civil
Wangzi Zhou, Bin Dong, Jinzhong Yang, Jinling Wang
Summary: In tracer experiments of surface flow constructed wetlands, a method for correcting RTD data and index values affected by tracer release duration was proposed to improve accuracy. Correction of hydraulic indexes can use analytical formulas, while RTD correction requires an RTD model or a smoothing algorithm. The effectiveness of the correction method was validated, and the impact of tracer release duration on RTDs and hydraulic indexes was analyzed without correction.
JOURNAL OF HYDROLOGY
(2021)
Article
Ecology
Alessandro Sacco, Giuseppe Luigi Cirelli, Delia Ventura, Salvatore Barbagallo, Feliciana Licciardello
Summary: The study evaluated a combined approach for assessing clogging occurrences in horizontal subsurface flow constructed wetlands, showing that clogging was in the initial stages of development.
ECOLOGICAL ENGINEERING
(2021)
Article
Environmental Sciences
Tanveer Saeed, Md Jihad Miah, Tanbir Khan
Summary: This study examined the removal performance of organics and nutrients in intensified constructed wetlands, specifically tidal flow-based microbial fuel cell (MFC) and tidal flow wetlands receiving municipal wastewater. The results showed high removal rates for ammonia nitrogen, total nitrogen, phosphorus, chemical oxygen demand, and biochemical oxygen demand under different flood periods and media variations, with TN removal reaching the highest percentage under 24-h flood periods. Tidal flow-based MFC wetlands outperformed tidal flow wetlands in TN removal due to supplementary electron production through fuel cell-based organics degradation kinetics.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Environmental Sciences
Erno Dittrich, Mihaly Klincsik, David Somfai, Anita Dolgos-Kovacs, Tibor Kiss, Anett Szekeres
Summary: The study discovered that conventional models cannot accurately describe the internal transport processes of HSFCW-Cs, and proposed a more accurate fitting method; this is significant for planted HSFCW-Cs and may pave the way for better process descriptions.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Environmental Sciences
Ruth Stephenson, Craig Sheridan, Uwe Kappelmeyer
Summary: Understanding the flow behaviour and accounting for time in constructed wetlands is crucial for modelling and design. Adding a tracer into the feed of a wetland helps researchers understand fluid flow, but conservative tracers may pose disposal problems. This study investigated the use of a non-conservative degradable tracer, benzoate, and developed a curve-shift technique to account for its degradation, with comparisons to a known conservative tracer, uranine.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Agricultural Engineering
Quan Zhang, Yongqiang Yang, Fanrong Chen, Lingling Zhang, Jingjun Ruan, Shijun Wu, Runliang Zhu
Summary: The addition of zeolite significantly enhanced nitrogen removal efficiency in the tidal flow constructed wetlands, leading to promising results in treating black and odorous water bodies. TFCW-Z demonstrates high performance, low footprint, and low maintenance cost, making it a competitive alternative for water treatment.
BIORESOURCE TECHNOLOGY
(2021)
Review
Ecology
Sofiane El Barkaoui, Laila Mandi, Faissal Aziz, Massimo Del Bubba, Naaila Ouazzani
Summary: This study critically reviews the latest literature on the integration of biochar in constructed wetlands for wastewater treatment. The review found that the quality of biochar is influenced by the conditions of its preparation, and the quality of biochar affects its treatment efficiency in wetlands. The configuration of wetlands and the method of integrating biochar also impact the efficiency of the treatment system.
ECOLOGICAL ENGINEERING
(2023)
Article
Agricultural Engineering
Liandong Zhang, Baoshan Yang, Hui Wang, Shuzhi Wang, Fei He, Wenxue Xu
Summary: The combined effects of substrate types and hydraulic retention time on nutrient removal and microbial co-occurrence networks in vertical flow constructed wetlands were investigated. The zeolite-packed wetlands showed superior removal rates and influenced the abundance and relative abundance of multiple genes in the microbial community. Zeolite-packed wetlands exhibited a strategy of ecological niche sharing, while ceramsite-packed wetlands displayed ecological niche differentiation.
BIORESOURCE TECHNOLOGY
(2023)
Review
Environmental Sciences
Rozi Sharma, Piyush Malaviya
Summary: Textile industries release large amounts of wastewater that can harm ecosystem health. Constructed wetlands are cost-effective and sustainable solutions for treating industrial wastewaters. This review examines recent advances in constructed wetlands for textile wastewater treatment, focusing on the mechanisms involved in contaminant removal and factors influencing system performance. The article also discusses integrated technologies, such as CW-MFCs/algal ponds/sponge iron coupled systems, for enhancing the performance and sustainability of constructed wetlands.
Review
Microbiology
Jianwu Wang, Yuannan Long, Guanlong Yu, Guoliang Wang, Zhenyu Zhou, Peiyuan Li, Yameng Zhang, Kai Yang, Shitao Wang
Summary: Constructed wetlands are a reliable alternative to traditional wastewater treatment technologies, with microorganisms playing a key role in pollutant removal. Advances in molecular biotechnology have enabled the analysis and study of microbial communities in complex environments. The main functional microorganisms in CWs can remove pollutants through various mechanisms, and factors such as heavy metals and antibiotics can significantly impact microbial diversity.
FRONTIERS IN MICROBIOLOGY
(2022)
Article
Engineering, Environmental
Ting Wei, Yaqian Zhao, Jia Guo, Bin Ji, Alvaro Pun Garcia, Abraham Esteve Nunez
Summary: This study developed a novel lightweight substrate (Al-NLS) composed of aluminum sludge and polyurethane, and investigated its effectiveness in constructed wetlands (CWs). Results showed that Al-NLS had favorable adsorption capacities for phosphorus and removal efficiencies for pollutants in real domestic wastewater. It also positively influenced the microbial community. Therefore, Al-NLS can be considered as a new alternative substrate in CWs technology.
JOURNAL OF WATER PROCESS ENGINEERING
(2024)
Review
Environmental Sciences
Basanta Kumar Biswal, Rajasekhar Balasubramanian
Summary: Constructed wetland systems utilizing natural substrates, plants, and microbes have shown to be cost-effective and sustainable for water treatment. This review critically analyzes the recent advances in applying these systems for pollutant removal and discusses key factors influencing their performance. Constructed wetland systems exhibit good performance in removing diverse pollutants through physical, chemical, and biological processes. The review also highlights the need for further research in developing multifunctional constructed wetland systems.
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2022)
Article
Agricultural Engineering
Chang-Qiang Guo, Yuan-Lai Cui
Summary: By integrating first-order kinetics with a hybrid solute transport model, a pollutant degradation model was developed for convenient performance evaluation of wetlands. The improved model showed good consistency with the original model and exhibited satisfactory fit after parameter optimization.
BIORESOURCE TECHNOLOGY
(2021)
Article
Engineering, Environmental
Jun-Feng Wang, Huan-Zhan Zhou, Guan-Hui Tang, Jia-Wei Huang, Hai Liu, Ze-Xiang Cai, Zhang-Wei He, Hui Zhu, Xin-Shan Song
Summary: This study explored the use of hydroxyapatite-gravel media in constructed wetlands (HA CWs) to effectively adsorb fluoride (F) and heavy metals (HMs) and enhance nitrate (NO3--N) reduction. The results showed that HA CWs had significantly higher removal efficiency for F, Cr, As, and NO3--N compared to conventional gravel substrate (CK CWs). HA substrate in CWs promoted the growth of wetland plants and enriched key functional genes related to nitrogen biotransformation, energy metabolism, and metal ion reduction.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Biotechnology & Applied Microbiology
Zhigang Huang, Jiang Zhang, Minmin Pan, Yuhang Hao, Ruichen Hu, Wenbo Xiao, Gang Li, Tao Lyu
Summary: This study proposed a new workflow for biofuel generation from microalgae biomass through lipid extraction and pyrolysis of defatted microalgae residues, and assessed its effects. The results indicated that lipid extraction and pyrolysis temperature had significant impacts on the pyrolysis products, and an optimal pyrolysis temperature was suggested to achieve the twin goals of lowering emission of pollutants and elevating energy products.
BIOCHEMICAL ENGINEERING JOURNAL
(2022)
Article
Environmental Sciences
Rui Xu, Tao Lyu, Lijing Wang, Yuting Yuan, Meiyi Zhang, Mick Cooper, Robert J. G. Mortimer, Queping Yang, Gang Pan
Summary: This study successfully developed an adsorbent made from coal fly ash modified with lanthanum for phosphorus recapture from water. The adsorbent showed high efficiency in phosphorus adsorption and had a minimal impact on the concentrations of other pollutants in water.
Article
Environmental Sciences
Xiqing Wang, Tao Lyu, Renjie Dong, Shubiao Wu
Summary: The study found that the electron transfer capacity (ETC) of HAs increased during anaerobic digestion process at both mesophilic (671-1479 mu mol gHA-1) and thermophilic (774-1506 mu mol gHA-1) conditions. The ETC was positively correlated with bacterial community in hydrolytic and acidogenic phases, but negatively correlated with archaeal community in methanogenic phase. Furthermore, HAs formed under thermophilic conditions had a greater influence on key enzyme activities than those formed under mesophilic conditions.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Green & Sustainable Science & Technology
Gang Li, Ruichen Hu, Nan Wang, Tenglun Yang, Fuzhuo Xu, Jiale Li, Jiahui Wu, Zhigang Huang, Minmin Pan, Tao Lyu
Summary: This study investigated a strategy of adjusting wastewater nutrient composition for microalgae cultivation and biofuel production, resulting in increased biomass production and improved biofuel quality, as well as reduced environmental impacts.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Environmental Sciences
Yuncheng Wu, Wei Tian, Yang Zhang, Wei Fan, Fang Liu, Jiayin Zhao, Mengmeng Wang, Yu Liu, Tao Lyu
Summary: This study investigated the use of novel nanobubble technology and ozone oxidation method to enhance the ozonization of ammonia. The results showed that the use of nanobubbles significantly improved the removal of ammonia compared to the control group, with a higher kinetic rate constant.
Article
Environmental Sciences
Jingjing Du, Yulong Niu, Haiming Wu, Dennis Konnerup, Shubiao Wu, Carlos A. Ramirez -Vargas, Yanqin Yang, Hans Brix, Carlos A. Arias
Summary: Biofilter systems coupled with microbial electrochemical technology can improve the removal performance of pollutants. This study found that using coke as the electroconductive substrate in biofilter systems resulted in better removal of NH4+-N, NO3--N, and PO43--P compared to gravel systems. The presence of silicone tubings also played a crucial role in oxygen supply. The results provide valuable insights for the application of coke in composite matrix systems.
Article
Biodiversity Conservation
Meiqi Yin, Lele Liu, Yiming Wu, Wenyi Sheng, Xiangyan Ma, Ning Du, Pengcheng Zhu, Cui Wang, Zhaojie Cui, Hans Brix, Franziska Eller, Weihua Guo
Summary: This study examines the effects of species and genetic diversity on litter decomposition in coastal wetlands. The results show that higher species and genetic diversity have negative effects on plant litter decomposition.
ECOLOGICAL INDICATORS
(2022)
Article
Engineering, Environmental
Wei Fan, Yuhang Li, Tao Lyu, Jia'ao Yu, Zhen Chen, Peter Jarvis, Yang Huo, Dan Xiao, Mingxin Huo
Summary: Bubble aeration is widely used in water/wastewater treatment, but it consumes a lot of energy due to its low gas utilization rate. The application of micro-nanobubbles (MNB) can significantly increase gas utilization by increasing the relative surface area and gas-liquid mass transfer efficiency. In this study, a dynamic model was developed to describe the bubble behavior in water and provide guidance for upgrading bubble aeration system. The model was validated with experimental data for microbubbles, but further study is needed for nanobubble aeration.
Article
Agronomy
Qiqiong Zhang, Zhongzheng Yan, Yuxin Bi, Ying Lei, Xiaoqing Gao, Xiuzhen Li, Hans Brix
Summary: The purpose of this study was to investigate the influence of the Fe reducing bacterium P. sp. SCSWA09 on the development of Fe plaques and the accumulation and translocation of heavy metals (HMs) in the mangrove plant K. obovata. The results showed that SCSWA09 had the ability to reduce Fe (III) and inoculation with SCSWA09 reduced the levels of Fe plaque production in K. obovata seedlings. Periodic flooding and SCSWA09 inoculation enhanced the crystallinity of Fe (hydr-) oxides, affecting HM absorption and translocation in plants.
Review
Biotechnology & Applied Microbiology
Gang Li, Fuzhuo Xu, Tenglun Yang, Xiqing Wang, Tao Lyu, Zhigang Huang
Summary: Anaerobic digestion technology is considered the most effective method for treating a distiller due to its environmental benefits, resource utilization, and low cost. However, microbial activity poses some limitations to this process. This paper critically reviews the microorganisms involved in the anaerobic digestion of a distiller, particularly focusing on the archaea community. The effects of operating parameters such as pH, temperature, and TAN on microbial activity and the process are discussed. Understanding microbial activity can further enhance the maturity of anaerobic treatment technology for a distiller. Additionally, the synergistic effect of different substrates and recent literature on the use of microorganisms to purify a distiller are briefly discussed for better purification and harm reduction. Further research is needed to explore the interactions between microorganisms and establish the mechanisms of microbial interactions in different environments.
FERMENTATION-BASEL
(2023)
Article
Environmental Sciences
Bangguo Wang, Lijing Wang, Wenxi Cen, Tao Lyu, Peter Jarvis, Yang Zhang, Yuanxun Zhang, Yinghui Han, Lei Wang, Gang Pan, Kaili Zhang, Wei Fan
Summary: This study investigates the feasibility and mechanisms of a chemical-free nanobubble-based AOP for treating organic micropollutants in water. The results show that the oxygen nanobubble AOP has a significantly higher removal efficiency compared to air and nitrogen nanobubbles. The treatment performance is not affected by pH and the presence of ions. Higher initial concentrations of the micropollutant lead to slower treatment processes, but similar removal performance is achieved in the end. The presence of organic matter reduces the removal rate of the micropollutant. The results have practical feasibility for water and wastewater treatment.
ENVIRONMENTAL POLLUTION
(2024)
Article
Ecology
Lele Liu, Yaolin Guo, Yiming Wu, Meiqi Yin, Xiao Guo, Franziska Eller, Christina L. Richards, Hans Brix, Rui-Ting Ju, Weihua Guo
Summary: Within-species genetic diversity is influenced by geography and has cascading effects on biodiversity. This study investigates the genetic structure of the native species Phragmites australis and its invasive competitor Spartina alterniflora. The results show geographical differentiation in genetic structure and an increase in genetic diversity from south to north. The invasive species alters the relationship between the genetic diversity of the native plant and the associated species richness of soil nematodes.
Review
Materials Science, Multidisciplinary
Gang Li, Wenbo Xiao, Tenglun Yang, Tao Lyu
Summary: Microalgae carbon dioxide (CO2) fixation technology is an effective way of environmental protection and resource utilization, which can be combined with wastewater and flue gas treatment, biofuel production, etc., to achieve high economic benefits. However, there are still challenges such as poor photosynthetic efficiency, high input cost, and large capital investment in industrial application. Therefore, further research is needed to improve microalgae carbon sequestration capacity and develop strategies for industrialization.
C-JOURNAL OF CARBON RESEARCH
(2023)
Article
Engineering, Environmental
Tao Lyu, Randy Williams, Benjamin Exton, Robert C. Grabowski
Summary: This study assessed the feasibility of using floating treatment wetlands (FTWs) as a nature-based solution (NbS) for treating propylene glycol-contaminated water and quantified different removal pathways. The results showed that microbial biodegradation and plant uptake were the major pathways for glycol removal, and FTWs were found to be an environmentally friendly and effective NbS for addressing glycol-contaminated water.
WATER SCIENCE AND TECHNOLOGY
(2023)
Article
Environmental Sciences
Othman Al-Mashaqbeh, Layal Alsalhi, Lana Salaymeh, Tao Lyu
Summary: This study investigated the use of nature-based solutions for treating pharmaceutical wastewater in Jordan. A pilot-scale hybrid treatment wetland equipped with local zeolite was employed and achieved high removal efficiencies for various pollutants. The study demonstrated the feasibility of using nature-based solutions for treating pharmaceutical wastewater and highlighted the need for further research to optimize this strategy.
WATER AND ENVIRONMENT JOURNAL
(2023)