Landfill leachate valorization: A potential alternative to burden off resources and support energy systems. (1st January 2023)

• Record Type: Journal Article
• Authors: Kumar, Smita S.; Kumar, Amit; Malyan, Sandeep K.; Ghosh, Pooja; Kumar, Madan; Kapoor, Rimika; Agrawal, Ajay Kumar; Kumar, Sumit; Kumar, Vivek; Singh, Lakhveer
• Is Part Of: Fuel. Volume 331:Part 2(2023)
• Publication Date: 2023-01-01
• Subjects: MSW Municipal solid waste -- LL Landfill leachate -- MT Million tonnes -- % Percentage -- AD Anaerobic digestion -- DF Dark fermentation -- SCWG Supercritical water gasification -- GHG Greenhouse gases -- N2O Nitrous oxide -- CH4 Methane -- CO2 Carbon dioxide -- VFAs Volatile fatty acids -- TOC Total organic carbon -- MFC Microbial Fuel Cells -- PMFC Plant Microbial Fuel Cells -- H2 Hydrogen -- BOD Biological oxygen demand -- COD Chemical oxygen demand -- TP Total phosphorus -- NO3-N Nitrate-nitrogen -- NH4-N Ammonia-N -- TKN Total Kjeldahl Nitrogen -- TN Total nitrogen -- SS Suspended solids -- CF Carbon felt -- OL Old landfill -- YL Young landfill -- ML Medium age landfill -- mg/L Milli gram per liter -- mM/L/D Milli mol per liter per day -- mL Milli liter -- PD Power density -- V Voltage -- v/v volume/volume -- MEC Microbial electrolysis cell -- C Carbon -- CC Carbon cloth -- CB Carbon brush -- OCV Open circuit voltage -- CD Current density -- EMBR Electrochemical membrane bioreactor -- ACFF Activated carbon fibre felt -- AMBR Anaerobic migrating blanket reactor -- ASBR Anaerobic sequencing batch reactor -- RDF Refuse-derived Fuel; Landfill leachate valorization -- Biogas -- Biological hydrogen -- Supercritical water gasification -- Bioelectrochemical system; Fuel -- Periodicals; Coal -- Periodicals; Coal; Fuel; Periodicals; 662.6
• DOI: 10.1016/j.fuel.2022.125911
• Languages: English
• ISSNs: 0016-2361

Abstract

Graphical abstract: MFC-Microbial Fuel Cells; SFE-Standard free energy; NEY-Net energy yield; COD-Chemical oxygen demand; BOD-Biological oxygen demand. Highlights: Energy valorization from landfill leachate different approaches has been discussed. Biogas production from leachate under thermophilic is higher over mesophilic. Blending waste with optimum LL enhanced biological hydrogen production in dark fermentation. Young age LL is more appropriate for the bioenergy production in MFC. Abstract: Landfilling is the globally adopted, low cost approach for disposing municipal solid waste. Landfilling contributes to environmental deterioration due to the emission of landfill gases especially methane (CH4 ), and release of hazardous organic and inorganic substances in the form of landfill leachate (LL). Proliferation of LL in the environment degrades the quality of soil, groundwater and surface water body (if any) and thus needs to be contained and treated before discharge. A wide range of treatment methods have been used for minimizing the contaminant load of LL. Nowadays stakeholders are moving towards more sustainable waste management practices and are utilizing waste as a resource to produce energy, fuel and other value-added products. However, unfortunately, the energy valorization from LL is lacking and it can fascinate global researchers for the treatment of LL with renewable energy production. Therefore in this study, we reviewed (1) the quality of LL generated from landfilling and its impact on the environment, (2) The energy valorization such as biogas, biological hydrogen, and bio-energy from LL through anaerobic digestion, dark fermentation, and Microbial Fuel Cells, respectively, and (3) Challenges and future prospects of energy valorization from LL. The resources present in leachate such as the organic matter, inorganic substances, and nutrients like N&P, can be converted to energy, and other value-added resources through valorization. LL valorisation can be a potential solution not only to reduce the contaminant load from the natural resources (air, water and soil) but also to utilize the energy resources in the form of either electricity and/or heat and serve as a potential alternative to non-renewable energy. Beside this, the other advantages of valorisation include amelioration of waste malodours and environmental pollution, and reduction of waste volume etc.