COMPOSTING PROCESS WITH PASSIVE (NATURAL) AERATION

Abstract

Municipal solid waste (MSW) treating technologies used popularly in Vietnam are landfills, whereas medical waste is usually treated by incinerators. Due to the disadvantages such as: large invest-ment and operational cost, high capital in case of small scales, producing secondary waste like exhaust gas from landfills and leachate that needs collecting and treating properly. Therefore, application of biotechnology based on microorganism’s aerobic decomposing process has opened a new potential way in treating MSW. However, the actual experience of composting facilities that apply aerobic decomposing process with active aeration (forced aeration) show that the efficiency is not high, energy cost is large and some problems with leachate. The research has successfully applied the composting technology with passive or natural aeration in order to treat MSW in small scale and the operational cost is pretty low. The research has also determined that the decrease of volume is 81,25%, the decrease of weigh is 75%; the rate of raw compost and original MSW after 28 days is 25% and the rate of compost after 56 days is