Abstract:

In order to study the mineralization process of organic substances, the composting for kitchen wasting mixed with wheat straw was carried out by static forced ventilation and under the conditions of different C/N ratio as 20, 25, 30, and the activities of Cellulase, Sucrase, Urease and protein enzyme were tested respectively at the different stages of composting. The results showed that the variation trends of temperature was similar for C/N ratio conditions, the temperatures above 40℃ lasted for about 10 days. The Cellulase activities under the conditions of 25C/N and 30C/N were higher than those of 20C/N, and the peaks of enzyme activity were lagged behind of the temperature peaks. Under different C/N conditions, the variation trends of Sucrase activities mainly was similar to each other, and the peaks of enzyme activities was synchronous to the temperature peaks. The peak of Urease activity under condition of 30C/N was appeared earlier than those of other two treatments, and eventually, the Urease activity declined in the last stage of composting. The higher temperature could inhibited the activity of protein enzyme, and its peak under condition of 25C/N was showed later than those of other two treatments. It could be seen from the results that the activities of the same enzymes were different under different nutrition conditions, and they were closely related to the change of organic substances, So they could be as one of the factors for evaluating the compost maturity.