Article
Environmental Sciences
Yajun Wu, Mengze Gao, Xudong Zhang, Yunda Zhang, Jiawei Ji
Summary: This study investigated the effect of initial water content on the dewatering characteristics of freeze-thaw (F/T) preconditioned landfill sludge. The results showed that higher initial water content led to greater improvement in dewatering performance after F/T preconditioning. When the initial water content exceeded 85%, the sludge particles experienced increased cracking, releasing bound water and further reducing the water content.
ENVIRONMENTAL RESEARCH
(2023)
Article
Environmental Sciences
Yang Xu, Yajun Wu, Xudong Zhang, Guang Chen, Yunda Zhang, Jiawei Ji
Summary: Globally, there is a large accumulation of landfill sludge (LS) that requires urgent reduction and dewatering. A new method called freeze-thaw combined with step vacuum preloading (F/T-SVP) is proposed to address pollution and clogging issues caused by chemical conditioning combined with traditional vacuum preloading (TVP) in treating LS. Experimental study comparing TVP and SVP showed that F/T-SVP effectively improved drainage and consolidation of LS by avoiding clogging and achieving a more compact structure.
ENVIRONMENTAL RESEARCH
(2023)
Article
Engineering, Environmental
Linxin Yin, Yao Guo, Zhicong Wang, Yaqi Shan, Peigao Duan, Chao Wang
Summary: This study proposed a new method named steam explosion (SE) coupled freeze-thaw (F-T) for enhancing the deep dewatering of municipal sewage sludge (MSS). The results showed that SE/F-T could effectively break the sludge gel-like structure and flocculate small sludge particles. The analysis also revealed that SE/F-T was conducive to decomposing extracellular polymer substances (EPS) and transforming and accumulating organic matter in sludge.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Engineering, Geological
Yang Xu, Yajun Wu, Xudong Zhang, Guang Chen
Summary: This study proposed a freeze-thaw process with vacuum preloading via prefabricated horizontal drains (PHDs) to address the problems of pollution, deformation, and blockage commonly associated with the traditional chemical vacuum preloading method for landfill sludge (LS). Experiment results showed that the water discharge and settlement of PHDs were higher than those of prefabricated vertical drains (PVDs), and PHDs achieved a greater volume reduction ratio. The study also revealed that PHDs had a high consolidation degree, mainly with micropores and mesoporous distribution.
INTERNATIONAL JOURNAL OF GEOMECHANICS
(2023)
Article
Engineering, Chemical
Umme Salma Rima, Nicholas Beier, Ahlam Abdulnabi
Summary: It is crucial to combine multiple technologies to maximize post-depositional dewatering, as centrifuge technology alone may not provide the required strength for incorporating fine tailings into dry landform reclamation. Additionally, promoting seasonal weathering effects can further enhance dewatering processes.
Article
Environmental Sciences
Jiajia Zhou, Jiaqing Xiong, Junguo Zhu, Xiaofei Xie, Junjie Ni, Yanzheng Liu, Xiangjun Wang
Summary: This study investigates the effects of freeze-thaw cycles (FTCs) on the performance of bioretention cells. The results show that FTCs significantly impact the removal efficiency of nitrogen pollutants in bioretention cells, while having minimal effect on phosphorus. Wood chips are found to be more suitable for efficient removal of nitrogen pollutants under FTCs. These experimental findings provide valuable reference for the construction of bioretention cells in cold regions.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Materials Science, Paper & Wood
Weihua Qin, Xiaolin Zhu, Chang Liu, Feng Lin
Summary: The effects of pressure, dewatering time, and sludge cake thickness on the dewatering of wastewater sludge were analyzed using the response surface method with the addition of CaO and FeSO4. The study found that increasing pressure and dewatering time improved the dewatering efficiency, while a thinner sludge cake resulted in better dewatering effect. The water content of the sludge could be influenced by the changes in these parameters. The response surface analysis showed a high significance and good correlation, with the increase in pressure and compression time enhancing the dewatering efficiency of the sludge.
Article
Construction & Building Technology
Jun He, Lei Zhang, Chi Zhang
Summary: The technique of solidifying sewage sludge with SR, GGBS, and QL shows good durability against dry-wet and freeze-thaw cycles. The UCS initially increases, then decreases to some extent with cycles, but remains higher after seven dry-wet cycles or ten freeze-thaw cycles. The main products detected in the solidified sludge are ettringite, hydroaluminite, and C-S-H, contributing to high UCS values and good durability.
ADVANCES IN CIVIL ENGINEERING
(2021)
Article
Engineering, Environmental
Yang Xu, Yajun Wu, Xudong Zhang, Guang Chen
Summary: A large amount of landfill sludge (LS) has accumulated worldwide, requiring deep dewatering and volume reduction. An in-situ treatment method combining freeze-thaw and vacuum preloading was proposed to address this issue. By studying the consolidation properties and microstructure of LS after different preconditioning methods, the vacuum consolidation principle was explored, showing significant changes in permeability, consolidation coefficient, and microstructure of LS after conditioning.
Article
Materials Science, Multidisciplinary
Zhang-qing Xuan, Zhi-min Sun, Jun-guang Wang, Wei-ji Sun, Bing Liang, Zheng Ma
Summary: This study investigates the mesoscopic damage and creep evolution characteristics of rock through freeze-thaw cycle experiments, nuclear magnetic resonance, and triaxial compression creep experiments. A nonlinear fractional damage creep model considering the number of cycles and temperature difference is proposed. The experimental results show significant effects of the number of cycles and freezing temperature on the creep deformation and steady-state creep rate of shale.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Engineering, Geological
Xudong Zhang, Dewei Du, Yajun Wu, Peng Ye, Yang Xu
Summary: The current treatment method for urban sludge is primarily sludge landfill, which requires the water content of the sludge to be less than 60%. Therefore, there have been various methods proposed by researchers to reduce sludge water content. The combination of freeze-thaw and chemical conditioning, along with vacuum pressure and vertically inserted drainage board, has been proven to be an effective method for reducing the moisture content of landfill sludge.
Article
Green & Sustainable Science & Technology
Xudong Zhang, Peng Ye, Yajun Wu, Manabu Fujii, Akihiro Takahashi, Yaoyi Wang
Summary: This study investigates the influence mechanism of different refrigerating temperatures on the physical-mechanical properties of sludge treated by freeze-thaw method. The results show that the freeze-thaw treatment leads to the gathering of sludge particles, decrease in compressibility and void ratio, increase of permeability coefficient and consolidation coefficient, and improvement in shear performance.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Environmental Sciences
Renjie Chen, Xiaohu Dai, Bin Dong
Summary: Hydrothermal treatment is a promising method for the sustainable treatment of municipal sludge, improving dewaterability and recovering biofuels, nutrients, and materials. This review summarizes the impact of different treatment temperatures on sludge dewaterability and product characteristics, and proposes an integrated sludge treatment system.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Review
Environmental Sciences
Yankai Liang, Rui Wang, Wenquan Sun, Yongjun Sun
Summary: This article analyzes the composition and properties of municipal sludge and examines the factors affecting its dewatering performance. It introduces various chemical conditioning methods and systematically analyzes the principles and applications of existing sludge conditioning technologies. It emphasizes the importance of developing a more appropriate combination of sludge conditioning and dewatering processes and optimizing the dewatering process by developing new efficient and environmentally friendly sludge conditioning agents.
Article
Engineering, Chemical
Qiyun Feng, Kangying Guo, Yue Gao, Beibei Liu, Qinyan Yue, Weijie Shi, Chunhui Feng, Jizhu Zhou, Guorui Wang, Baoyu Gao
Summary: This study optimized the preparation conditions of polysilicate ferric, polysilicate aluminum ferric, and polysilicate aluminum ferric magnesium and investigated their performance in sludge dewatering pretreatment. The results showed that polysilicate improved sludge dewatering performance through adsorption bridging effect and charge neutralization.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Environmental Sciences
Elizabeth Alvarez-Chavez, Stephane Godbout, Mylene Genereux, Caroline Cote, Alain N. Rousseau, Sebastien Fournel
Summary: This study evaluated the effect of alternative filtering materials and bed aeration on the retention of nutrients and fecal bacteria in woodchip bedded stand-off pads for cows. The results showed that the alternative biofilters were more efficient in removing COD, SS, TN, and NO3-N, while conventional biofilters were more efficient for PO4-P removal. Aeration did not have a significant effect under the tested temperature conditions.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2024)
Article
Environmental Sciences
Yike Zhang, Zengyi Ma, Zhuoting Fang, Yuandong Qian, Zhiping Huang, Yilong Ye, Jianhua Yan
Summary: This study investigates the application of oxygen enrichment melting technology in the melting of municipal solid waste incineration fly ash. The results demonstrate that oxygen enrichment technology can reduce energy consumption and operating costs, as well as decrease pollution emissions.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2024)
Article
Environmental Sciences
Liangang Xiao, Mingkai Leng, Philip Greenwood, Rongqin Zhao, Zhixiang Xie, Zengtao You, Junguo Liu
Summary: This study investigates the effects of grazing exclusion on soil organic carbon (SOC) accumulation and vegetation recovery. It finds that grazing exclusion can increase the potential for SOC accumulation, and higher annual precipitation is positively correlated with SOC accumulation.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2024)
Article
Environmental Sciences
Beatrice Cantoni, Jessica Ianes, Beatrice Bertolo, Selena Ziccardi, Francesco Maffini, Manuela Antonelli
Summary: This study evaluates the performance of ozonation and adsorption as in-series processes compared to standalone processes for the removal of Contaminants of Emerging Concern (CECs) in drinking water. The combination of both processes proves to be more effective than adsorption and ozonation alone. Ozonation improves the adsorption performance of poorly-oxidizable CECs but worsens that of well-oxidizable compounds. This research highlights the importance of considering both processes in the removal of CECs in drinking water treatment plants.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2024)
Article
Environmental Sciences
Dan Li, Bingjun Liu, Yang Lu, Jianyu Fu
Summary: A new Standardized compound Drought and Saltwater intrusion Index (SDSI) was developed to detect changes in the severity of CDSEs in six estuaries. The study found that saltwater intrusion plays a dominant role in influencing SDSI severity, and CDSEs vary in frequency, duration and severity among different estuaries.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2024)
Article
Environmental Sciences
Yong-Qiang Li, Rui Sun, Chong-Miao Zhang, Zi-Xuan Liu, Rui-tao Chen, Jian Zhao, Hua-dong Gu, Huan-Cai Yin
Summary: In this study, an electron beam excitation multi-wavelength ultraviolet (EBE-MW-UV) system was established and found to have significantly higher microbial inactivation effects compared to single-wavelength UV-LEDs in water. Mechanism analysis revealed that EBE-MW-UV damaged microbial DNA and proteins, and generated additional reactive oxygen species, leading to microbial inactivation.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2024)
Article
Environmental Sciences
Kaili Ma, Xinxin Han, Qiujuan Li, Yu Kong, Qiaoli Liu, Xu Yan, Yahong Luo, Xiaopin Li, Huiyang Wen, Zhiguo Cao
Summary: This study reveals that the use of a tryptophan-degrading microbial consortium (TDC) can enhance the hydrolysis efficiency of waste activated sludge (WAS), increasing the yield and quality of short chain fatty acids (SCFAs) and improving the solubilization and release of organic substances from WAS.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2024)
Article
Environmental Sciences
Ling Xiong, Rui Li
Summary: Incorporating Ecosystem Service Value (ESV) into land use planning can provide informed land management decisions. This study evaluates the ESV of Guizhou Province in China's karst region. The results show an increase in total ESV over the past two decades due to ecological restoration projects.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2024)
Article
Environmental Sciences
M. Geetha Jenifel
Summary: This article discusses the importance of water and the pollution of freshwater resources, and introduces the use of machine learning models and blockchain technology to predict and protect water quality.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2024)
Article
Environmental Sciences
Stanslaus Terengia Materu, Taotao Chen, Chang Liu, Daocai Chi, Meng Jun
Summary: The study showed that H2SO4-modified biochar can reduce P leaching, increase soil available P, and enhance plant P uptake in alternate wetting and drying irrigation systems. Biochar additions B20A and IAWDB20A-M were effective in improving yield, reducing P leaching, and increasing APB.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2024)
Article
Environmental Sciences
Amir Nouri, Ali Akbar Zinatizadeh, Sirus Zinadini, Mark Van Loosdrecht
Summary: This study focuses on the development of an air-lift bio-electrochemical reactor (ALBER) with a continuous feeding regime to enhance nitrogen removal from synthetic wastewater. The effect of temperature, hydraulic retention time (HRT), N -NH+4 /TN ratio, and current density on the reactor performance was investigated, and the ALBER achieved a maximum TN removal of 73%. The results suggest that the ALBER has potential for treating industrial wastewater at low temperatures.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2024)
Article
Environmental Sciences
Peifang Wang, Guoxiang You, Yang Gao, Juan Chen, Xun Wang, Chao Wang
Summary: This study investigated the ecological processes of microbial communities and N- and P-transformation processes in multistage agricultural drainage ditches. The results showed that the microbial communities were co-shaped by agricultural practices and ditch size, which further governed the N and P removal performance.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2024)
Article
Environmental Sciences
Xiaofeng Niu, Huan Wang, Tao Wang, Peiyu Zhang, Huan Zhang, Hongxia Wang, Xianghong Kong, Songguang Xie, Jun Xu
Summary: Microorganisms play a critical role in maintaining ecosystem balance, and environmental stressors can affect the assembly processes of microbial communities. The study found that different stressors have opposite effects on microbial community assembly in water and sediment, and warming has different influences compared to herbicides and nutrients.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2024)
Article
Environmental Sciences
Yuqing Tan, Qiming Cheng, Fengwei Lyu, Fei Liu, Linhao Liu, Yihong Su, Shaochun Yuan, Wenyu Xiao, Zhen Liu, Yao Chen
Summary: The exacerbation of global warming, extreme weather events, and rapid urbanization have led to increased flooding in urban areas. China has adopted sponge city as an efficient means of preventing and controlling urban floods. Using a SWMM-FVCOM model, the hydrological reduction and control effect of sponge city construction (SPCC) within a university campus were evaluated. The study found that implementing SPCC effectively mitigates surface runoff and reduces the severity of urban flooding. However, the efficacy of runoff control decreases with longer rainfall return periods.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2024)
Article
Environmental Sciences
Zhonghan Chen, Qiuyan Li, Shibo Yan, Juan Xu, Qiaoyun Lin, Zhuangming Zhao, Ziying He
Summary: Tidal rivers are important biochemical reaction channels, receiving carbon from wastewater and agricultural drains, affecting CO2 emissions. Through modeling and data analysis, researchers explored carbon distribution, emissions, and greenhouse effects, emphasizing the potential of river management to change global CO2 emissions under climate change.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2024)