Biogas production for organic waste management: a case study of canteen’s organic waste in Solid Waste Management Technical Support Center, Lalitpur, Nepal

Abstract

Management of solid waste is one of the major challenges faced by the municipalities. Solid waste mainly comprises of organic waste. Proper management of organic waste helps minimize solid waste problem. This study was carried out to assess the production of biogas from canteen’s organic waste as a solution for management of organic waste in Solid Waste Management Technical Support Centre, Lalitpur using innovative urban biogas plant with capacity 1,275 liters for 48 days. The physicochemical parameters of canteen’s waste and bio-slurry were analyzed. Similarly, volume of biogas, volume of methane and carbon dioxide in biogas produced were measured and CO2 reduction from biogas plant was identified. The average values of physicochemical parameters of canteen’s waste lied within the optimum range for biogas production. The biogas plant produced 22.03 liters/kg of waste and 120.47 liters/day of biogas. The produced biogas contained 48.89% methane and 39.11% carbon dioxide on average. The biogas plant could reduce 3.20 tones of CO2 equivalent per annum from 262.50 kg of waste fed for 48 days. The values of nitrogen, phosphorus and potassium of bio-slurry indicated it as a better fertilizer. Shapiro-Wilk test showed that the p-value of collected data were greater than 0.05 indicating normal distribution. Linear regression between ambient temperature and biogas production showed that the p-value less than 0.05 indicating significant relationship between them (r2=0.08). The estimated return period of the invested money was 9.5 months in kerosene substitution or 9.7 months in firewood substitution or 9.5 months in LPG substitution. Similarly, the estimated average rate of return was 125.26% in kerosene substitution or 123.72% in firewood substitution or 125.01% in LPG substitution. These results indicated that biogas production using innovative urban biogas plant is better solution for organic waste management. Further extensive and large scale research need to be carried out for the optimization of the biogas plant.

Plastic warriors: a study on self-help group’s contribution to economic, social value creation and sustainable development goals (SDGs) in Tamil Nadu, India

“…While international studies corroborate the economic and social dividends reaped by SHG members (Karim and Nigar, 2016; Wahab et al , 2018; Shrestha et al , 2019), a group of researchers challenge these narratives, arguing the lack of compelling evidence supporting SHGs’ tangible upliftment of women’s socio-economic conditions (Desai and Joshi, 2013; Mader, 2015). Contrarily, Kandpal and Saizen (2022) advocate that SHG engagement fosters positive attitudes towards SWM and augments their social capital.…”

“…SHGs in waste management have gained attention, particularly in the developing world (Shrestha et al , 2019; Rahman et al , 2019). SHGs have increased waste collection and recycling in Vietnam and Ghana and created employment while reducing landfill waste in Brazil (Ngoc and Schnitzer, 2009; Miezah et al , 2015).…”