Volume No. 3 Issue No.: 1 Page No.: 51-61 July-Sept 2008

 

VERMICOMPOSTING OF MUNICIPAL AND AGRICULTURAL SOLID WASTE WITH SEWAGE SLUDGE

 

M. Lokeshwari*1 and C. Nanjunda Swamy2

1. Ph. D Research Scholar, P.E.T. Research Centre, Mandya, Karnataka, India.
2. Prof. and Head, Department of Civil Engineering, Dr. AIT, Bengaloru, India.

 

Received on : January 2, 2008

 

ABSTRACT

 

The studies were conducted on municipal, agricultural and mixed solid waste. Sewage sludge was mixed with each of the above said waste in different proportion, to compare the technical viability of an integrated system of composting. Waste were mixed in 0%, 10%, 20%, 30% proportion with the sewage sludge, collected from waste water treatment plant. It was allowed to decompose for about 20 days aerobically and then transferred to vermipits. Chemical analysis of sample shows the significant decrease in carbon content and good amount of N, P, K content in the final compost. Pre-aerobic decomposition for 20 days followed by vermicompost reduces the overall time required for composting (30 days), when compared to windrow composting, which requires about 80 days to get the final product. Hence vermicomposting can be suggested as a better method of solid waste treatment, which is one of the major issues now a day. Mixing of sewage sludge with the wastes show increase in nutrient content beside solves the problem of sludge disposal.

 

Keywords : Municipal solid waste, Sewage sludge, Aerobic decomposition, Vermipits.

 

 

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