Review
Engineering, Environmental
Nam-Hoon Lee, Sang-Hoon Song, Min-Jung Jung, Ran-Hui Kim, Jin-Kyu Park
Summary: This study outlines the dynamics of N2O in solid waste landfills and its emissions. N2O is mainly generated through denitrification and to a lesser extent, nitrification in anaerobic landfills. Landfill leachate treatment processes also contribute to significant N2O emissions. Bioreactor landfills emit more N2O than traditional anaerobic landfills due to various pathways such as NH2OH oxidation, nitrifier denitrification, and heterotrophic denitrification. Factors like C/N ratio, NH3 oxidation rate, redox conditions, and temperature affect these processes. Addressing N2O emissions from landfills is crucial for an integrated nitrogen management strategy.
ENVIRONMENTAL ENGINEERING RESEARCH
(2023)
Article
Engineering, Environmental
Yi Wang, Binjuan Li, Furong Xue, Wenhuai Wang, Xiaozhong Huang, Zhen Wang
Summary: This study investigated the performance of a continuous tower biofilter reactor (TBFR) with a large height-to-diameter ratio of 13 in treating landfill leachate. The results showed high removal rates of total nitrogen and chemical oxygen demand, with optimal reaction conditions in different zones along the reactor. The TBFR demonstrated effective treatment of landfill leachate by creating distinct aerobic and anaerobic zones in a single reactor.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Article
Environmental Sciences
L. M. L. K. B. Lindamulla, N. K. R. N. Jayawardene, W. S. M. S. K. Wijerathne, M. Othman, K. G. N. Nanayakkara, K. B. S. N. Jinadasa, G. B. B. Herath, V Jegatheesan
Summary: This study describes the collection and characterization of landfill leachate from different climatic zones in Sri Lanka. Membrane bioreactors (MBRs) with different configurations were used to treat the leachate, and the optimal operating conditions for the treatment were determined. The study highlights the capabilities of MBR in treating landfill leachate.
Article
Environmental Sciences
Junliang Gao, Rui Wang, Yilin Li, Huimin Huang, Xiaomei Su, Zijing An, Wenjun Yin, Lizhen Yang, Liang Rong, Faqian Sun
Summary: The effect of two aeration modes in the aerobic phase on nitrogen removal and N2O emission in treating landfill leachate was compared. Increasing dissolved oxygen showed positive effects on nitrogen removal and minimized N2O emission. However, high dissolved oxygen concentration reduced nitrogen removal and led to high N2O emission.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Environmental
Yanwu Zhou, Juan Zhou, Jianheng Yu, Xia Huang, Xiaojun Niu, Yiu Fai Tsang
Summary: The landfill leachate has been successfully treated using an anaerobic-anoxic-oxic (A(2)/O) system at the Datansha Wastewater Treatment Plant in Guangzhou, for almost five years. The operating conditions with a hydraulic retention time of 11 hours, dissolved oxygen of 3 mg/L, mixed liquid return ratio of 200%, and sludge return ratio of 80% resulted in the highest removal efficiencies for chemical oxygen demand (COD), ammonium-nitrogen (NH4+-N), and total nitrogen (TN). Compared to the previous A(2)/O system, the COD, NH4+-N, and TN removal efficiencies increased by 5.6%, 9.8%, and 5.3% respectively. The average effluent concentrations were all below the standard discharge limits in China.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2023)
Article
Environmental Sciences
Jingang Qiu, Xiyao Li, Yongzhen Peng, Hao Jiang
Summary: This study established a two-stage combined process of partial nitrification-Anammox (PNA) and partial denitrification-Anammox (PDA) for advanced nitrogen removal from landfill leachate. The system achieved high nitrogen removal efficiency (NRE), with PNA and PDA contributing significantly. The study provides valuable insights for the practical application of PNA-PDA processes in landfill sites.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Yi Wang, Wen-Huai Wang, Heng Zhang, Fei-Long Yan, Jia-Jun Li
Summary: The study found that successful removal of organic matter and nitrogen can be achieved in wetlands with partial-area aeration by using intermittent aeration strategy, which can also enhance the conversion rate of ammonia nitrogen, maintain a stable dissolved oxygen concentration, and ensure the accumulation rate of nitrite.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Engineering, Environmental
Fangzhai Zhang, Yongzhen Peng, Zihui Liu, Yongwang Liu, Li Zhao
Summary: A novel fermentation-based double denitrification bioprocess successfully combined fermentation and denitrification, treating high ammonia wastewater efficiently with nitrogen removal and sludge reduction.
Article
Microbiology
Rossana Petrilli, Attilio Fabbretti, Alex Cerretani, Kathleen Pucci, Graziella Pagliaretta, Matteo Picciolini, Valerio Napolioni, Maurizio Falconi
Summary: The production of leachate, a liquid formed by rainwater percolation through waste, has led to serious problems in municipal wastewater treatment plants due to its high levels of toxic ammonia. In this study, a metagenomic approach based on next-generation sequencing was used to analyze the microbial composition of sludge in a wastewater treatment plant in Italy. Through enrichment experiments, a minimal bacterial community capable of degrading high concentrations of ammonium in leachate was identified. Further analysis revealed that certain bacterial families were responsible for ammonia oxidation and three bacteria genera were capable of nitrification coupled with denitrification. These findings provide a foundation for optimizing microorganism mixtures for the biological removal of ammonia in leachate.
Article
Green & Sustainable Science & Technology
Weifeng Deng, Litao Wang, Lang Cheng, Wenbo Yang, Dawen Gao
Summary: This paper reviewed the recent advances of anammox based processes for mature landfill leachate treatment and suggested some improvements to enhance the process efficiency.
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
Engineering, Chemical
Irina Schneider, Ivaylo Yotinov, Nora Dinova, Bogidara Geneva, Elmira Daskalova, Stilyana Lincheva, Yana Topalova
Summary: This study compared the denitrification and nitrification processes during landfill leachate treatment in a wastewater treatment plant in Sofia City, Bulgaria. The results showed that denitrification was the critical process in the technology based on D/N, while nitrification processes were accomplished with high intensity. D/N could be optimized and controlled using specific wastewater treatment technology parameters and indicators.
Article
Engineering, Environmental
Zhaozhi Wang, Hao Jiang, Yayi Wang, Yongmei Li, Haoran Liang, Ying Yan, Yongzhen Peng
Summary: In this study, a low-carbon/nitrogen mature landfill leachate treatment process was developed using cofermentation liquid of corn straw and excess sludge. This process achieved efficient nitrogen removal and sludge reduction.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Agricultural Engineering
Hao Jiang, Xiyao Li, Fangzhai Zhang, Zhong Wang, Shang Ren, Jingang Qiu, Shuying Wang, Yongzhen Peng
Summary: This study established a novel step-draining based partial nitrification-denitrification and Anammox system for advanced nitrogen removal from mature landfill leachate. By separating partial nitrification and denitrification through step-draining, a high nitrogen removal rate was achieved. The NH4+ to NO2- ratio could be easily controlled by adjusting the volume ratio of effluents from the PND reactor. The presence of Brocadia, Kuenenia, and Jettenia in the AMX reactor contributed significantly to nitrogen removal.
BIORESOURCE TECHNOLOGY
(2022)
Review
Biotechnology & Applied Microbiology
Lea Issa, Olga El Kik, Mutasem El-Fadel
Summary: This paper provides a critical review on the progress and application of anaerobic MBR (AnMBR) technology for treating landfill leachate. The technology enhances biomass retention and produces renewable energy in the form of methane biogas, reducing aeration and sludge handling costs. The paper evaluates its performance and addresses potential limitations, such as fouling and inhibitory factors that may affect microbial communities. It proposes a comprehensive experimental program to improve the application of AnMBR technology.
REVIEWS IN ENVIRONMENTAL SCIENCE AND BIO-TECHNOLOGY
(2022)
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.