Article
Engineering, Environmental
Xiuwen Qian, Juan Huang, Chunni Yan, Jun Xiao
Summary: In this study, the introduction of 10-30 mg/L nano zero-valent iron (nZVI) into constructed wetlands (CWs) was found to effectively promote nitrogen removal and increase the activity of nitrogen cycling enzymes. However, high dosage of nZVI inhibited the activity of certain enzymes, highlighting the importance of controlling the appropriate dosage.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Environmental Sciences
Mengqi Li, Jian Zhang, Shuang Liang, Ming Li, Haiming Wu
Summary: This study found that introducing a magnetic field into vertical flow constructed wetlands significantly enhanced the removal of organic compounds and nitrogen. It also had no severe impact on wetland plants but significantly altered the microbial community.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Environmental
Jian Liu, Feng Gao, Mengchun Gao, Yangguo Zhao, Liang Guo, Chunji Jin, Junyuan Ji, Zonglian She
Summary: This study investigated the influence of flow mode, salinity, and depth on the removal and transformation processes of organic matter and nitrogen in tidal flow constructed wetlands. The results showed that down-flow mode was beneficial for COD removal, while up-flow mode improved denitrification and total inorganic nitrogen removal. High salinity decreased NH4+-N removal and led to higher NO2-N accumulation. The composition and abundance of functional bacteria in the wetlands were affected by flow mode, salinity, and depth. Higher abundance of ammonia oxidizing bacteria (AOB) was observed under down-flow mode, while denitrifying bacteria (DNB) enriched in specific depth layers. High salinity inhibited the growth of AOB and nitrite oxidizing bacteria (NOB).
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Green & Sustainable Science & Technology
Qian Wang, Jiewei Ding, Huijun Xie, Derek Hao, Yuanda Du, Congcong Zhao, Fei Xu, Qiang Kong, Baoshan Wang
Summary: The study found that using intertidal wetland sediments as a microbial source for CWs can effectively improve phosphorus removal rates, with bacteria such as phosphorus-accumulating organisms enhancing microbial transformation of phosphorus. However, the addition of IWS increased phosphorus loss via substrate accumulation and decreased phosphorus removal rate via plant uptake.
JOURNAL OF CLEANER PRODUCTION
(2021)
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
Engineering, Environmental
Jie Li, Lin Liu, Yu-Ming Zheng, Lin Ma, Quan-Bao Zhao, Chao-Xiang Liu
Summary: This study found that plants (Phragmites) play a significant role in the anammox-driven wetlands, enhancing the nitrogen transformation. The proportion of anammox process in nitrogen metabolism was estimated to be 45-63% in plant groups. The presence of plants significantly increased the total nitrogen removal efficiency and the abundance of anammox bacteria.
CHEMICAL ENGINEERING JOURNAL
(2023)
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
Engineering, Environmental
Chong Cao, Juan Huang, Chun-Ni Yan
Summary: The addition of silver nanoparticles in constructed wetlands can decrease nitrogen and phosphorus removal efficiency and alter microbial communities. The relative abundances of functional genes related to nitrogen and phosphorus conversion in the upper soil are significantly decreased after the dosing of silver nanoparticles.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Engineering, Environmental
Hong-cheng Wang, Ying Liu, Yu-meng Yang, Ying-ke Fang, Shuang Luo, Hao-yi Cheng, Ai-jie Wang
Summary: Constructed wetlands integrated with sulfur autotrophic denitrification using elemental sulfur as the carbon source have the potential to efficiently remove nitrogen from carbon-limited wastewater. The sulfur autotrophic denitrification process in the SCW enhances nitrate removal efficiency and rate. The combined CW-SCW system allows for simultaneous removal of total ammonia nitrogen and nitrate.
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
Environmental Sciences
Mamta Sharma, Neeta Raj Sharma, Rameshwar S. Kanwar
Summary: Burning surplus agricultural residues is a common practice worldwide, but it leads to emissions and nutrient loss. Constructed wetlands can be a sustainable solution by using these residues as substrates for growing ornamental plants and generating income. This study explored the use of agricultural residues and biochar as substrates in constructed wetlands for growing ornamental plants.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Environmental Sciences
Ning Zhang, Chaoyu Li, Huijun Xie, Yixiao Yang, Zhen Hu, Mingming Gao, Shuang Liang, Kuishuang Feng
Summary: The study demonstrates that enhanced Mn redox cycling in constructed wetlands can improve nitrogen removal efficiency, and using Mn oxides as the matrix can accelerate the nitrogen removal process.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Engineering, Environmental
Luping Zeng, Yunv Dai, Xiaomeng Zhang, Ying Man, Yiping Tai, Yang Yang, Ran Tao
Summary: The co-occurrence network of bacteria in HSSF CW was complex, while both VF and SF CW had simple functional topological structures. The VF CW reduced functional redundancy by niche differentiation, while the SF CW had bacterial niche overlap protecting a single function.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Engineering, Environmental
Yiting Chen, Jun Yan, Mengli Chen, Fucheng Guo, Tao Liu, Yi Chen
Summary: Constructed wetland-microbial fuel cells (CW-MFCs) were built to achieve simultaneous nitrogen removal and electricity generation using wetland plant litter fermentation broths as carbon sources. The addition of fermentation broths significantly improved nitrogen removal and voltage output. The study also identified acetic acid and humic acid in the fermentation broths, which increased the abundance of functional genes associated with nitrogen metabolism and electron transfer.
FRONTIERS OF ENVIRONMENTAL SCIENCE & ENGINEERING
(2022)
Article
Green & Sustainable Science & Technology
Mengni Tao, Zhaoqian Jing, Zhengkai Tao, Hui Luo, Simin Zuo, Yu-You Li
Summary: The addition of corncobs in treating secondary effluent from municipal wastewater treatment plants significantly enhances the denitrification performance and bioelectricity generation in a microbial fuel cell-constructed wetland system. The optimal dosage of corncobs is found to be 70 g/m(2), resulting in the highest nitrate removal and power density. High-throughput sequencing analysis reveals the presence of microorganisms related to organics degradation, and certain functional genera contribute to higher nitrogen removal and bioelectricity generation in the MFC-CW system.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Engineering, Chemical
Jialu Zhang, Xiangfeng Huang, Yongjiao Xiong, Weiwei Zheng, Wanqi Liu, Mengfan He, Lexue Li, Jia Liu, Lijun Lu, Kaiming Peng
Summary: The study utilized bioinspired spider silk to construct a novel superhydrophilic electrospun nanofibrous membrane for highly efficient separation of nanoemulsions, achieving both high oil rejection and high permeate flux. The directional migration and coalescence of nano-sized oil droplets on spindle-knotted structures driven by Laplace force and the rejection of large oil droplets by the superhydrophilic nanofibrous membrane with negligible fouling were crucial in achieving the breakthrough results.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Environmental Sciences
Shuang-Qiang Li, Gen-Dong Li, Kai-Ming Peng, Li-Heng Yang, Xiang-Feng Huang, Li-Jun Lu, Jia Liu
Summary: This study conducted a potting experiment to promote the colonization of Phragmites in Cd polluted, nutrient deprived, and structurally damaged soil using chemical and microbial modifiers. The co-application of Diversispora versiformis and sodium bentonite significantly improved the soil structure and phosphorus utilization of the plant, while reducing the content of cadmium bound by diethylenetriaminepenta-acetic acid. The results showed increased Phragmites height, tillers, and photosynthetic capacity, along with increased abundance of phosphorus-releasing microbial communities and regulation of phosphorus fixation by the plant.
Article
Biotechnology & Applied Microbiology
Lexue Li, Yuyan Zhang, Xiangfeng Huang, Mengfan He, Jia Liu, Lijun Lu, Chen Cai, Kaiming Peng
Summary: The production of microbial biomass, microbial cell properties, and biological function are significantly influenced by different hydrophobic organic compounds (HOCs). This study investigated the metabolic responses in Dietzia natronolimnaea S-XJ-1, a biodemulsifier, when utilizing alkanes and fatty acid esters as HOCs. The transcriptomic analyses revealed the upregulation of ATP-binding cassette transporters and the downregulation of transporters for hydrophilic nutrients and cell division genes, which may explain the lower biomass production in liquid paraffin-cultured S-XJ-1. In addition, the upregulation of genes involved in surface protein biosynthesis, poly-L-glutamine layer, and mycolic acids enhanced the cell-surface hydrophobicity and biodemulsifying activity of liquid paraffin-cultured S-XJ-1. These findings can contribute to the design of more effective biodemulsifiers and deepen our understanding of complex metabolic responses induced by different HOCs.
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
(2022)
Article
Environmental Sciences
Yongjiao Xiong, Xiangfeng Huang, Lexue Li, Wanqi Liu, Jialu Zhang, Mengfan He, Jia Liu, Lijun Lu, Kaiming Peng
Summary: A new approach is proposed to deal with high concentration surfactant stabilized waste nanoemulsions, achieving efficient oil-water separation and wastewater treatment by manipulating the surface charge and morphology of magnetic nanoparticles.
JOURNAL OF ENVIRONMENTAL SCIENCES
(2022)
Article
Engineering, Environmental
Chen Cai, Xiangfeng Huang, Xiaohu Dai
Summary: Centralized sludge treatment plants (CSTPs) are important hotspots for antibiotic resistance genes. The treatment process significantly affects the abundance of intracellular and extracellular ARGs, and there is no significant difference in composition between iARGs and eARGs in CSTPs. Additionally, there are relationships between certain resistance mechanisms and functional traits, suggesting that ARGs may be involved in the physiological process of microorganisms in sludge treatment.
Article
Environmental Sciences
Jing-Cheng Xu, Li-Heng Yang, Jing-Xi Yuan, Shuang-Qiang Li, Kai-Ming Peng, Li-Jun Lu, Xiang-Feng Huang, Jia Liu
Summary: Coupling surfactants with in situ chemical oxidation (ISCO) technology improves the desorption and solubilization efficiency of NAPL contaminants, but the complex interactions among surfactants, oxidation systems, and NAPLs have not been fully understood. This review provides a comprehensive overview on the effects of surfactants on oxidation systems and NAPL degradation behavior.
Article
Green & Sustainable Science & Technology
Xia Zhao, Xiang-Feng Huang, Zhi Wang, Kai-Ming Peng, Li-Jun Lu, Jia Liu
Summary: Modified bentonite (MB) with carboxyl and hydroxyl groups on a coverage film was successfully prepared and used for the removal of Cd2+ and Pb2+. The adsorption mechanism of MB for Cd2+ and Pb2+ was determined by analyzing multiple kinetics and isotherms. Additionally, MB exhibited good permeability control in high-concentration heavy-metal solution.
JOURNAL OF CLEANER PRODUCTION
(2022)
Review
Engineering, Environmental
Jia Liu, Wen-yan Li, Hong-xin Chen, Shuang-qiang Li, Li-heng Yang, Kai-ming Peng, Chen Cai, Xiang-feng Huang
Summary: This review discusses the stabilization mechanisms of nanoparticle-stabilized surfactant foam (NP-SF) and the effects of nanoparticle properties on foam stability. Different types of nanoparticles, such as SiO2 and nano zero-valent iron, have been used to stabilize foam for remediation of petroleum-contaminated soils. Additionally, the efficiency and recyclability of Al2O3/Fe3O4 nanoparticles in diesel and crude oil remediation can be enhanced by applying a magnetic field. This review provides a theoretical basis and practical guidelines for developing functional NP-SF for remediation of petroleum-contaminated soils.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Environmental Sciences
Shuangqiang Li, Shanqing Chi, Caiqiang Lin, Chen Cai, Liheng Yang, Kaiming Peng, Xiangfeng Huang, Jia Liu
Summary: This study demonstrates that the combination of agricultural biochar and arbuscular mycorrhizal fungi can promote the growth of Phragmites in structurally damaged and nutritionally imbalanced littoral zone soils. Biochar improves soil porosity and phosphorus availability, while the addition of fungi enhances the plant's photosynthetic rate and biomass. In addition, microbial co-occurrence network analysis reveals the significance of this combination in phosphorus utilization in the rhizosphere soil.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Environmental
Zhangsong Jiang, Xiangfeng Huang, Qiaofeng Wu, Mi Li, Qili Xie, Zuwen Liu, Xiaoming Zou
Summary: In this study, the adsorption characteristics of 10 sulfonamide drugs on polyamide were analyzed, and significant structural effects were observed. The results revealed that the octanol-water partition coefficients and the valid adsorption energies between polyamide and sulfonamide drugs are vital in understanding the structural effects. Additionally, the density functional theory results demonstrated that different adsorption energies were engendered by varying configurations and interactions.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Xiaojing Ni, Xiangfeng Huang, Ru Guo, Jinhui Wang, Kaiming Peng, Wei Zhang, Yuyu Zhu, Weilan Yang, Liya Wang, Chen Cai, Jia Liu, Erwu Liu
Summary: This study proposes a new approach to explore the water-energy-carbon (WEC) nexus of wastewater treatment plants (WWTPs) using a Water-Energy-Carbon Coupling Index (WECCI) and a four-quadrant clustering (FQC) method. The analysis of operational data from a WWTP in southern China reveals that the WECCI increased after the first standard upgrade and decreased after the second standard upgrade, indicating unexpected changes in overall performance. The FQC method shows that a majority of the operation data are concentrated in the WEC best synergy zone after the first standard upgrade, while a significant percentage are concentrated in the low carbon trade-off zone after the second standard upgrade. These findings highlight the importance of WECCI and FQC as tools for quantitatively assessing the integrated performance of WWTPs and understanding the complex WEC mechanisms, facilitating the transition of WWTPs towards carbon neutrality.
RESOURCES CONSERVATION AND RECYCLING
(2023)
Review
Engineering, Environmental
Xiang-Feng Huang, Jing-Xi Yuan, Xia Zhao, Shuang-Qiang Li, Li-Heng Yang, Wen-Yan Li, Kai-Ming Peng, Chen Cai, Jia Liu
Summary: This review discusses the adsorption characteristics of carbocatalysts to persulfate (PS) and organics, and the influences of carbon adsorptive properties on PS activation pathways. The cycle of adsorption and oxidation on carbocatalysts increases the reaction stoichiometric efficiency (RSE) and kinetic rate (kobs) of PS-AOPs. The surface and structure characteristics of carbocatalysts are investigated, which are responsible for the behaviors of adsorption and activation. Optimization strategies of carbocatalysts are proposed to decrease the inhibition of co-existing organics and external substances in actual wastewater.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Mechanical
Xiangfeng Huang, Lincong Chen, Yichao Gao
Summary: The present study investigates the nonlinear random vibration of deep-water piers under horizontal seismic excitation. The stochastic dynamic model of the pier is formulated, and the equations for the amplitude envelope and the conditional reliability function are derived. Numerical discussions are conducted to analyze the effects of various factors on the system response and first-passage failure. The results show that increased excitation intensity, mass ratio, immersion ratio, and hydrodynamic effect amplify the response and reduce the reliability of the deep-water pier system. The findings of this study provide valuable insights for the optimal seismic design of deep-water piers.
PROBABILISTIC ENGINEERING MECHANICS
(2023)
Article
Engineering, Chemical
Weiwei Zheng, Jingcheng Xu, Liya Wang, Jialu Zhang, Wenhai Chu, Jia Liu, Lijun Lu, Chen Cai, Kaiming Peng, Xiangfeng Huang
Summary: This study successfully separated micro-/nano-paraffin in water emulsions stabilized by SDS using a electric field and superhydrophilic fibrous membranes, achieving improved flux and oil removal efficiency.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Engineering, Chemical
Lexue Li, Mengfan He, Kaiming Peng, Jia Liu, Lijun Lu, Xiangfeng Huang
Summary: A novel magnetically oscillatory fluidized bed (MOFB) was developed for cost-effective and continuous emulsion separation, using reusable micron-sized magnetic particles (MMPs) and a low-energy electromagnetic field. The MOFB showed excellent separation efficiency and a higher treatment capacity for emulsified oil compared to conventional methods. The study provides insights into the design of a novel magnetic separator for continuous emulsion separation and promotes technological evolution toward economically competitive separation methods.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
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)
