Performance Analysis of Homebiogas 2.0 Plant and Comparison with GGC Modified Model

Abstract

Homebiogas is a tubular shaped biodigester. The size in research is of 2 cubicmeter. Its digester chamber of size 1200 liters and gas bag of size 800 liters. Homebiogas system has two different compartments, one for digester chamber and another for gas chamber. Pressure for the produced biogas have been created through dead load (Sand bags) placed on the pocket of gas bag. There has been mixed feeding. During experiment cow manure as well as kitchen waste like rice, vegetables, fruit waste, leamon, citrus food and bread was fed to the system. After the system has been stabilized if the input material was only kitchen waste, there has been decrease in pH. So there need to be added cattle manure in order to neutralize the pH. The average gases produced per day have been 201 liters. Homebiogas 2.0 can replace 3.064kg of LPG per month or 37.488kg of LPG per year. Biogas composition has been in good range with methane concentration of 58.1%, carbon dioxide with 37.1% and rests other gases. Energy produced per day has been 1.308kWh. A total solid of inlet and outlet is 44.72 and 12.72 mg/g. The volatile solid of inlet and outlet have been 38.31 and 9.8 mg/g. Percentage reduction in TS and VS have been 71.56% and 74.2% respectively. There have been higher reductions in TS and VS for food waste when anerobically digested with cow manure. Volatile solid had been 85.66% of total solid for feedstock material. When the feedstock was digested anaerobically, outlet slurry has been 77.044% of TS. Co digestion gives higher degradation rate as compared to monodigestion. The biogas produced from homebiogas has been 0.419 m3 /kg of TS and 0.471 m3 /kg of VS. Nitrogen, Potassium and Phosphorus of feedstock has been 0.27%, 0.1%, 0.06% respectively and outlet slurry have been 0.19%, 0.09%, 0.04% respectively. There have been slightly decreases in the value of the NPK because formation of ammonia gas through formation of ammonium ion. Gas output from the HBG 2.0 was 0.44 times the output of GGC modified of 6m3 . Gas output from the HBG 2.0 has been 8.375L/hour. There need to be used Greenhouses, Compost heap and hot water during colder climate. Using Greenhouses, Compost heap and hot water we can increase the output from the system.