Article
Engineering, Environmental
Yang Deng, Nan Chen, Weiwu Hu, Haishuang Wang, Peijing Kuang, Fangxin Chen, Chuanping Feng
Summary: In this study, a persulfate-enhanced electro-coagulation system (PECS) was constructed to improve the removal of COD and shorten the settling time of the flocculation precipitates. By using activated persulfate oxidation process, PECS can reduce the aromaticity and complexity of organic matter, generating small molecular-weight organic matter to alleviate the pressure of subsequent treatment of the leachate. The results suggest that PECS could improve the removal of organic matter, increase the COD removal, and shorten the separation time of precipitates under similar treatment costs to conventional processes.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Environmental
Xue Zhang, Huijuan Han, Hongxing Chai, Penghao Gao, Wei Wu, Mengzhao Li, Qingxin Lv, Xianglin Guo, Qingmei Meng, Xinpeng Liu, Peiling Gao
Summary: Wastewater treatment is achieved through the regeneration of resources and energy using pre-treatment technologies. Coagulation pre-treatment of landfill leachate was performed in this study using polymeric iron sulfate (PFS) as a coagulant. The effects of PFS dosing, initial pH, and PAM dosing on the removal of COD, TP, and UV254 from the leachate were evaluated. Response surface methodology (RSM) was used to assess the individual and interactive effects of parameters on COD%, TP%, and UV254%. The optimization results showed significant removal of contaminants in the leachate, with COD%, TP%, and UV254% reaching their maximum values at specific conditions.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Environmental Sciences
M. B. Karagozoglu, F. S. Guney
Summary: This study investigated the removal of organic and inorganic pollutants in landfill leachate using the electro-Fenton process. The results showed that under optimum conditions, the process was able to effectively degrade organic compounds in the leachate, achieving high removal efficiencies.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2023)
Review
Green & Sustainable Science & Technology
Ye Li, Fan Tang, Dan Xu, Bing Xie
Summary: With the increase in municipal solid waste output, landfill leachate treatment has become a major concern. This paper reviews different biological treatment methods, highlighting the higher efficiency of nitrogen removal in processes combined with microorganisms.
Article
Environmental Sciences
Cheng Long, Bin Zhu, Wei Liu, Qixuan Li
Summary: Coagulation combined with the electro-Fe-0/H2O2 reaction was developed to efficiently treat refractory organics in landfill leachate effluent. The optimal conditions were determined, leading to high removal efficiencies of COD and chromaticity. The process effectively degraded humic and fulvic acids and enhanced biodegradability, with a low operating cost.
Article
Environmental Sciences
Anjali Bhagwat, Rajat Kumar, Chandra Shekhar Prasad Ojha, Mukesh Kumar Sharma, Apourv Pant, Babita Sharma, Jai Vir Tyagi
Summary: The leachates from landfills pose a potential contamination risk to surface and groundwater. As the landfill ages, the leachate's pH changes, affecting treatment methods. Ferric chloride is found to be the most efficient coagulant, surpassing Fenton. Switching to ferric chloride or Fenton treatment can significantly reduce operational costs compared to the current method used.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Engineering, Environmental
Emine Can-Guven, Senem Yazici Guvenc, Gamze Varank
Summary: This study investigated a sequential treatment of landfill leachate including coagulation and binary oxidation processes. The research optimized the chemical coagulation process and examined the factors affecting the binary oxidation process to achieve high removal efficiencies. The results showed that the binary processes were more effective than single processes, reaching significant removal efficiencies under optimal conditions.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Article
Environmental Sciences
Siying Sun, Jiabao Ren, Jiale Liu, Liang Rong, Hangli Wang, Yeyuan Xiao, Faqian Sun, Rongwei Mei, Chongjun Chen, Xiaomei Su
Summary: The study found that pyrite-activated persulfate oxidation efficiently removed organic matter from the effluent of a biological landfill leachate treatment system, and subsequent denitrification was also successful. With the optimal parameters, a COD removal efficiency of about 45% and a nitrate removal rate of around 108 mg L-1 d(-1) were achieved.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Environmental Sciences
Aysenur Turan, Mehmet Kobya, Cisel Iskurt, Erhan Gengec, Alireza Khataee
Summary: Landfill leachate treatment in Turkey commonly utilizes a combination of membrane bioreactor (MBR) and membrane treatment using nanofiltration (NF) and/or reverse osmosis (RO). This process yields landfill leachate membrane concentrates (LLMCs) that have high concentrations of contaminants. In this study, two different nanofiltration concentrates of leachate were subjected to coagulation. The most effective pH values for the coagulants were found to be 5.0 for Al3+ and 4.0 for Fe3+, which are lower than the typically recommended pH values due to the presence of humic substances in the wastewater. Among the coagulants analyzed, Fe2(SO4)3.xH2O had the lowest cost.
Article
Environmental Sciences
Yilin Li, Wenjia Zhang, Yun Dai, Xiaomei Su, Yeyuan Xiao, Dan Wu, Faqian Sun, Rongwu Mei, Jianrong Chen, Hongjun Lin
Summary: This study investigated the start-up, influencing factors, and stable operation of partial denitrification for treating biological effluent from landfill leachate. The research found a suitable ratio of nitrate/ammonium for downstream Anammox process, and highlighted the importance of carbon sources, COD/NO3--N ratio, and salinity in partial denitrification.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Environmental
Shaik Nazia, Nivedita Sahu, Veeriah Jegatheesan, Suresh K. Bhargava, Sundergopal Sridhar
Summary: The study integrated UF process and chemical coagulation to treat OILL, achieving significant reduction in TDS, conductivity, turbidity, color and pH values through coagulation by FeCl3 and UF membrane process. FeCl3 coagulant + UF showed the highest removal efficiency for color and turbidity, with the overall process demonstrating advantages of small equipment footprint, economy, environmental safety, low energy consumption, and ease of scale-up for up to 70% water reclamation.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Environmental
Mohini Verma, Shubhrasekhar Chakraborty, Shweta Kumari, Aalok Gupta, Dewanshu Kumar, Jawed Iqbal, J. Rajesh Banu, Arulazhagan Pugazhendi, R. Naresh Kumar
Summary: A laboratory-scale GAC-SBR was used to co-treat landfill leachate and municipal wastewater, and the treatment efficiency was evaluated. Increasing GAC concentration led to better removal of COD and ammonia from leachate. GAC-SBR demonstrated efficient removal of COD and nutrients at a 10-day HRT. Statistically significant differences were observed in the treatments for different leachate:wastewater ratios. Coupled treatment showed potential for co-treatment, but additional physico-chemical processes may be required for further pollutant removal.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2023)
Article
Engineering, Environmental
Mingran Li, Mengnan Zhou, Xia Qin
Summary: This study investigated the electro-Fenton treatment of landfill leachate using an orthogonal experiment to determine the optimal operating parameters. Diluting the leachate with electro-Fenton effluent improved the treatment performance, achieving a significant reduction in COD. The study also found that the treatment effectively decomposed organic matter in the leachate and reduced its humification. Compared to previous studies, this treatment method demonstrated high removal efficiency, low energy consumption, and cost-effectiveness.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Chemistry, Analytical
Tahar Bennama, Abdelkader Elaziouti, Abdelkader Debab
Summary: The biosorption capacity of untreated and chemically treated olive stones for removing COD from landfill leachate was investigated in this study. The results showed that the chemically treated olive stones had higher COD removal efficiency and could be employed as an inexpensive and effective biosorbent for stabilized leachate treatment. These findings also provided baseline information and design assistance for leachate treatment at the Hassi Bounif Sanitary Landfill and other sanitary landfills in Algeria.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY
(2022)
Article
Engineering, Environmental
A. Q. Jaradat, Dua'a B. Telfah, Rabah Ismail
Summary: The study examines the potential of using CES for heavy metals removal from wastewater, comparing its adsorptive attributes to GAC. Results show that under optimal hydrodynamic conditions, using a sand column before the CES column improves the removal efficiency of heavy metals compared to using CES alone.
WATER SCIENCE AND TECHNOLOGY
(2021)
