Article
Green & Sustainable Science & Technology
Radhakrishnan Naresh Kumar, Somya Sadaf, Mohini Verma, Shubhrasekhar Chakraborty, Shweta Kumari, Veerababu Polisetti, Parashuram Kallem, Jawed Iqbal, Fawzi Banat
Summary: The use of novel flocculants in combination with a sequencing batch reactor (SBR) has proven effective in reducing polluted effluents from landfill leachate and municipal wastewater. Co-treatment of landfill leachate with municipal wastewater in SBR, followed by coagulation-flocculation, achieved significant removal of COD, ammonia, nitrate, phosphate, turbidity, and TSS. The combined treatment with the new flocculants successfully met international standards for discharges to inland surface water.
Article
Engineering, Environmental
Vicente Elicio P. S. G. da Silva, Silvio Luiz de Sousa Rollemberg, Andre Bezerra dos Santos
Summary: Aerobic granular sludge (AGS) systems were evaluated for the simultaneous removal of carbon, nitrogen, and phosphorous in leachate treatment. Among the different reactor configurations, the O/An with step-feeding reactor (R4) showed the highest biomass retention, nitrification rate, and removal of COD, total nitrogen, and total phosphorous.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2023)
Article
Agricultural Engineering
Xiaowu Huang, Wenkui Mi, Hiroaki Ito, Yasunori Kawagoshi
Summary: Partial nitritation/Anammox was effectively applied to treat NaCl-amended landfill leachate, achieving robust nitrogen removal at varying salinities. The dynamics of Anammox bacteria were influenced by salinity variations, with different genera exhibiting dominance under different salinity levels. Key factors such as high nitrite affinity and specific functionalities facilitated certain bacteria's dominance in saline environments, enhancing the efficiency of nitrogen removal processes. Co-occurrence networks indicated beneficial symbiotic relationships contributing to the dominance of specific genera.
BIORESOURCE TECHNOLOGY
(2021)
Article
Environmental Sciences
Ahmet Duyar, Vildan Ciftcioglu, Kevser Cirik, Gokhan Civelekoglu, Serhan Urus
Summary: This study recommended coupling of conventional single-stage A/O with moving bed biofilm reactor and membrane bioreactor for landfill leachate treatment. The system achieved efficient removal of COD, nitrogen, and PAEs, with notable presence of various metal elements and important microbial activities in the AnoxMBBR and AeMBR.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
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
Environmental Sciences
Fabio Rohers, Ramon Lucas Dalsasso, Willian Cezar Nadaleti, Marcelo Seleme Matias, Armando Borges de Castilhos Junior
Summary: Several environmental problems in Brazil are caused by accelerated urban and industrial growth, resulting in a variety of urban waste. Landfill waste disposal is still common practice in Brazil. This study proposes an alternative method of physical-chemical treatment using sand filters and activated carbon columns for landfill leachate, showing significant reductions in COD, BOD5, ammonia, and color. The use of activated carbon columns demonstrated excellent performance in removing heavy metals, with limitations found in the length of filtration races.
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
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
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
Environmental Sciences
Peng Wen, Yuyu Huang, Zhongping Qiu, Qibin Li
Summary: The SAARB demonstrated stable removal of organic matter and nitrogen from different landfill leachates, with microbial communities changing significantly after treatment. Microbial abundance and diversity were most affected by the content of refractory organics in the leachate, with Proteobacteria being the dominant microorganism. This study highlights the potential for optimization and application of SAARB in leachate treatment.
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
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
J. J. Gonzalez-Cortes, F. Almenglo, M. Ramirez, D. Cantero
Summary: This study investigates the feasibility of using landfill leachate as an ammonium source for anoxic biodesulfurization, showing promising results with high elemental sulfur production and H2S elimination capacities. The microbial community analysis reveals the presence of Sulfurimonas as the most common genus in the desulfurizing bioreactor.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Dongyun Liu, Jing Xu, Yuan Fang, Yao Du, Lifang Hu, Chengran Fang, Dongsheng Shen, Yuyang Long
Summary: The study investigated the impact of moisture and air on the migration of chloride ions in landfills, finding that water and air significantly influenced the release of chloride ions in leachate. The results showed that continuous release of chloride ions occurs when leachate is recirculated in landfills.
ENVIRONMENTAL TECHNOLOGY
(2022)
Article
Engineering, Environmental
Raquel Greice de Souza Marotta Alfaia, Ronei de Almeida, Kleby Soares do Nascimento, Juacyara Carbonelli Campos
Summary: This study investigates the effects of landfill leachate pretreatment on the performance of NF and RO membranes. The results show that C/F pretreatment can significantly improve the permeate flux and reduce fouling resistance of certain membranes. It is recommended to pretreat the landfill leachate to mitigate membrane fouling.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2023)
Article
Environmental Sciences
Zaidun Naji Abudi, Zhiquan Hu, Bo Xiao, Alkhafaji R. Abood, Nagham Rajaa, Mahmood Laghari
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2016)
Article
Geosciences, Multidisciplinary
Aref Alshameri, Alkhafaji R. Abood, Chunjie Yan, Akhtar Malik Muhammad
ARABIAN JOURNAL OF GEOSCIENCES
(2014)
Article
Green & Sustainable Science & Technology
Alkhafaji R. Abood, Jianguo Bao, Zaidun Naji Abudi, Dan Zheng, Chunlei Gao
CLEAN TECHNOLOGIES AND ENVIRONMENTAL POLICY
(2013)
Article
Environmental Sciences
Alkhafaji R. Abood, Jianguo Bao, Zaidun N. Abudi
JOURNAL OF ENVIRONMENTAL SCIENCES
(2013)
Article
Environmental Sciences
Zaidun Naji Abudi, Zhiquan Hu, Alkhafaji R. Abood, Dongqi Liu, Aiping Gao
WASTE AND BIOMASS VALORIZATION
(2020)
Article
Energy & Fuels
Zaidun Naji Abudi, Zhiquan Hu, Alkhafaji R. Abood
Summary: This study evaluated the anaerobic batch co-digestion of mango leaves and pig manure at 37℃ and found that the addition of pig manure significantly improved methane production from mango leaves. The highest biodegradability and methane yield were obtained at a ratio of 1:3, which was higher than other mixing ratios. The cone model showed a better fit to the experimental data.
BIOMASS CONVERSION AND BIOREFINERY
(2022)
Article
Engineering, Environmental
Jamal S. Makki, Alkhafaji R. Abood, Mohammad H. Al-Umar
JOURNAL OF ECOLOGICAL ENGINEERING
(2019)
Article
Engineering, Environmental
Xiaojian Liu, Bei Wang, Yayun Ma, Xiangyang Zhou, Juan Yang, Yuehui He, Jingjing Tang, Fanyun Su, Wan Yang
Summary: This study proposes a combined process of reduction roasting of herb-medicine residue and oxalic acid leaching to improve the recovery efficiency of lithium from spent lithium-ion batteries. By utilizing the reducing gas produced from the pyrolysis of herb-medicine residue, the layered structure of the cathode powder is destroyed and converted into Li2CO3, Ni, Co, and MnO. Additionally, selective extraction of lithium is achieved using oxalic acid, and the efficiency and kinetics of lithium extraction are improved under the combined action of herb-medicine residue and oxalic acid.
Article
Engineering, Environmental
Muxina Konarova, Nuno Batalha, Gabriel Fraga, Mohamed H. M. Ahmed, Steven Pratt, Bronwyn Laycock
Summary: This study presents a proof of concept for a technology that integrates PET recovery from mixed plastic waste and plastic pyrolysis. By depolymerizing PET into TPA using a low volatility oil as medium, it achieves low-pressure operation and a selective separation and recovery of TPA from the product mix. Full PET conversion and high TPA recovery were achieved, making it an effective solution for processing mixed waste streams and improving the yield and quality of liquid product from thermal pyrolysis compared to untreated feedstock.
Article
Engineering, Environmental
Zhenhua Sun, Jing Li, Xuejiang Wang, Siqing Xia, Jianfu Zhao
Summary: This study investigated the influence of in-situ formed MgFe2O4 on the hydrothermal treatment of swine manure. The results showed that the in-situ formation of MgFe2O4 improved the dehydration and decarboxylation of organic components in swine manure, thereby improving its carbonization degree. Furthermore, it enhanced the stabilization of heavy metals and the retention of phosphorus. MgFe2O4 modified hydrochars exhibited remarkable adsorption capacity for Pb(II) and Cu(II) without any leaching of heavy metals.
Article
Engineering, Environmental
Yijing Jiang, Boyang Leng, Jingxin Xi
Summary: The increased generation of municipal solid waste has had a significant impact on the economy, environment, and public health. The current waste treatment process has limitations. By developing a comprehensive social costing model, this study assesses the impacts of municipal solid waste management throughout its life cycle and provides policymakers with best practices and feasibility information.
Article
Engineering, Environmental
Marina Hernandes de Paula e Silva, Ricardo Coser Mergulha, Jose Geraldo Vidal Vieira, Andrea Brasco Pampanelli, Rodrigo Salvador, Diogo Aparecido Lopes Silva
Summary: This study developed and implemented a self-assessment tool to assist companies in decision-making processes for establishing circular flows based on Lean Manufacturing and Circular Economy principles. The tool utilized a maturity model and was applied to nine companies of varying characteristics. The findings revealed that certain companies showed higher maturity in water-waste and chemical-emissions management, with larger enterprises focusing on these strategies. However, many companies lacked sufficient training and employee awareness prior to seeking cleaner alternatives, and comprehensive actions to manage the product lifecycle were lacking. To address these gaps, the tool provided tailored recommendations for each company to improve their processes, products, and value chain.
Article
Engineering, Environmental
Gamze Dogdu, Turgay Pekdemir, Sanaz Lakestani, Seyda Karabork, Osman Cavus
Summary: This paper presents data on food waste associated with mini size food packaging services, highlighting the difficulties in emptying the food and consumer wastefulness as the main causes. These findings have significant implications for the sustainability of food and relevant packaging.
Article
Engineering, Environmental
Qingxia Li, Xin Kong, Yuxin Chen, Jianan Niu, Jia Jing, Jin Yuan, Yifeng Zhang
Summary: This study investigates how to enhance methane production from food waste after hydrothermal pretreatment. The results demonstrate a significant increase in methane yield when zero-valent iron and magnetite are used together, and high organic loading is favorable for methane production. Microbial diversity analysis further reveals the dominant pathways and metabolic processes involved in methane generation.
Article
Engineering, Environmental
D. H. H. Sim, I. A. W. Tan, L. L. P. Lim, E. T. Lau, B. H. Hameed
Summary: The development of controlled-release fertilizer formulation is important for preventing environmental pollution caused by nutrient leaching and volatilization. This study combined biochar-based fertilizer with encapsulation technology to improve the nutrient release mechanism. Optimal conditions for synthesizing urea-impregnated biochar (UIB) were determined using central composite design, and the release of nitrogen was described by mathematical models. Results showed that encapsulated UIB (EUIB) achieved complete release of nitrogen in water and exhibited improved water retention in sandy-textural soil. Therefore, EUIB derived from peppercorn waste has the potential to be used as a sustainable controlled-release fertilizer for agriculture.
Article
Engineering, Environmental
Yuchuan Wang, Neslihan Akdeniz
Summary: Incorporating biochar into composting systems can increase compost temperatures. This study developed a heat transfer model for a biochar-amended co-composting system and found that biochar increased thermal conductive losses but also enhanced microbial activity, resulting in an overall increase in total heat unit. When biochar was applied on the surface, it mainly functioned as an insulator.
Article
Engineering, Environmental
George Tsalis, Birger Boutrup Jensen, Jessica Aschemann-Witzel
Summary: This paper empirically explores the relationship between retail price promotions and household food waste. The results show that households with a higher proportion of discount food purchases and environmental awareness tend to waste less food, while larger households and those lacking food handling skills tend to waste more food.
Article
Engineering, Environmental
Lukas Friederici, Arne Koch, Patrick Martens, Jana Pantzke, Sebastiano Di Bucchianico, Thorsten Streibel, Christopher P. Rueger, Ralf Zimmermann
Summary: The increasing demand for lightweight materials has led to a rise in fiber-reinforced plastic (FRP) production. However, the properties and compositional range of FRPs pose challenges to recycling strategies. Pyrolysis has emerged as a promising method for separating the fibers from the polymer matrix. This study investigated the pyrolysis process using thermal analysis and high-resolution mass spectrometry, and also assessed the toxicity of the recovered fibers using an in vitro model.
Review
Engineering, Environmental
Devika Kannan, Shakiba Khademolqorani, Nassibeh Janatyan, Somaieh Alavi
Summary: This paper introduces Smart Waste Management (SWM) that applies Industry 4.0 technologies in waste management. A framework called SWM4.0 is developed, which highlights the importance of smart people, smart cities, smart enterprises, and smart factories in achieving successful waste management. The paper also suggests future research directions and managerial implications.