Evaluation of Effect of Seeding on the Reaction Rate of Thermophilic Composting
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概要
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Effects of seeding on the thermophilic composting of organic waste were examined by measuring the changes in CO<SUB>2</SUB> evolution rate, conversion of carbon, pH value, and microbial succession in the composting reaction using a commercial dog's food as raw material.<BR>Time courses of the above values for six experimental runs inoculated with different seeding materials which contain different kinds and concentration of microorganisms were grouped into two substantially different patterns. One was of a successful composting, in which the CO<SUB>2</SUB> evolution rate and conversion of carbon were large and the pH value gradually increased to around 8.5 with the progress of reaction. The other was of unsuccessful composting, where the pH value dropped from the initial level of 7 to a low level of 5 at the early stage of reaction and never rose up. The organic matter decomposition was discontinued at a low level of carbon conversion because of inhibitory effect on the microbial growth at the low pH level. In such case, however, the organic matter decomposition could be promoted by adjusting the initial pH value at the higher level in order to avoid the pH value dropping to the low level. The analysis of microbial succession indicated that the kind of microorganisms on seeding was more important than the total number of microorganisms for successful composting.
- 一般社団法人 廃棄物資源循環学会の論文