Performance Analysis of Technology for Economic Development (TED) Model Biogas Plant and Comparison with Modified GGC-2047 Model Biogas plant

Abstract

TED model biogas plant is a fixed dome type digester. The size of the plant is 20 m3 having digester volume 12 m3 and gaseous volume 8 m3 . There has been mixture of feeding. During the study cow manure, human waste and kitchen waste like rice, fruits, vegetables, eggs, pickles, vegetables etc. was fed into the system. The digester was fed with 84 kg mixed waste per day on average generated from the school. The average gases produced per day have been 5425 liters. The plant is able to save nearly 5 cylinder of LPG per month. The recorded burning time for this amount of gas production is 9- 11 hours per day in a stove of size 0.25m3 . The total solid of inlet feedstock and outlet slurry is 14.58% and 8.13%. The volatile solids of the inlet feedstock and outlet slurry have been 78.59% and 48.98%. Percentage reduction in TS and VS have been 44.24% and 37.71% respectively. The average pH of the outlet is found to 7.1 which is around neutral. It is found to have higher reduction in TS and VS when the kitchen waste and cow manure is co-digested anaerobically. The biogas produced from the plant has been 1.01 m3 /kg of TS and 0.22 m3 / kg of VS. Nitrogen, Potassium and Phosphorus of feedstock has been 0.37%, 0.25%, 1.54% respectively and outlet slurry have been 0.17%, 0.03%, 0.68%. The plant could reduce 12.027 Tonnes of CO2 equivalent. There have been slightly decreases in the value of the NPK because formation of ammonia gas through formation of ammonium ion. Financial analysis shown that the plants must get subsidized in order to get profitability.