Abstract:
This thesis deals with the studies of physico-chemical andbiological changes d.uring compost ing of Bangkok Metropolitanmunicipal wastes. The composting processes are classified into 2phases, the multifloor fermented building with five days activeaction and the open dumping area with 65 days curing action.In physical aspects changes of temperature, moisturecontent and pH were taken in consideration while in chemicalaspects changes in carbon, nitrogen, C/N ratio and organic matterswere considered. In biological aspects , changes of mesophilic ,thermophilic organisms and three enzyme activities, namely; protease,amylase and cellulase were studied during cornposting.The physical and chemical results showed that the averagevalue of initial moisture content was 60% while that of the last daywas 22% and the minimum and maximum temperatures during compostingwere 30 *C and 66-C, respectively. The pH values varied from 5 to 8.The initial C/N and final C/N ratios were 34 and 15, respectively.The values of initial and final organic matters were 65% and 27%,respectively. In biological aspects, the study aimed to find outthe total count numbers of mesophiles and thermophiles by usingsix media, namely; garbage, starch, casein, cellulose, xylan andplate count agar.The microorganism in Bangkok Metropolitan domestic compostcan be classified into mesophile, thermotolerance mesophile a n dthermophile. Amylase enzyme showed the important role duringactive stage while protease enzyme expressed its function duringlate active stage. In curing stage, only cellulase enzyme playedthe important role in degradation of carbon complex molecules.