Life cycle environmental and economic assessment of human night soil based Malaprabha biogas plant

India's inadequate faecal sludge management continues to be a source of concern and to tackle this prob-lem Dr. S. V. Mapuskar has proposed "Malaprabha digester" a hygienically safe and environmentally sus-tainable solution. The current research was carried out to evaluate life cycle assessment (LCA) and life cycle cost assessment (LCCA) of human night soil based Malaprabha biogas plant. LCA and LCCA were conducted with impact 2002+ method (with 14 midpoint and 4 damage categories) and present worth (PW) method as mentioned in Bureau of Indian Standards IS 13,174 (1991) part 2 respectively. Herein, the case study pertains to the design of the digester for 890 habitants of a high-rise building (G + 30). The results showed that the system's operational phase mainly contributes to eutrophication, acidifica-tion and ecotoxicity potential whereas, the most detrimental emissions of the construction phase were determined by the use of cement, steel and PVC materials. Since the emission of methane during anaer-obic digestion can be fully trapped in the Malaprabha digester, it can assist in enhancing greenhouse gas sinks. Moreover, Economic assessment of this on-site treatment of night soil represents monitory benefits by replacing cooking gas (LPG) with biogas for 30 min per day per family. Thus, by utilizing Malaprabha digester as a source of biogas, dependency on fossil fuels is being reduced in a sustainable way and costs would be saved for the construction of the septic tank.Copyright (c) 2022 Elsevier Ltd. All rights reserved.Selection and peer-review under responsibility of the scientific committee of the Sustainable Materials and Practices for Built Environment.