The Influence of Temperature, PH Value and C/N Ratio on the Growth and Survival of Earthworm in Municipal Solid Waste

摘要

Earthworms can be used to deal with solid organic waste. Many studies on the effect of temperature, moisture, PH value on the growth, fecundity and survival of earthworm in manure. The study of the influence of the similar parameters is presented in this paper. The growth and mortality of earthworm in municipal solid waste with different temperature (15°C, 20°C,25°C) were studied for 70 days, different PH value (5.1, 5.4, 6.5, 7.2, 8.6) were studied for one day and repeated three times, and different C/N ratio (26, 24, 22, 20, 17, 15) were studied for 15 days and repeated twice. The object of this study is Eisenia fetida, and the raw material is mainly come from China Agricultural University including leftover, vegetable, leaves and so on. The following conclusions have been derived: 1. Earthworm growth correlations were found to be like S shape in different temperature and found that the shortest growth period is 52d at 25°C, the largest growth rate is 0.0138 g per day. 2. A correlation between the growth rate and feed-conversion rate was determined, the largest weight-gain rate and feed-conversion rate at 19.7°C and 21.9°C can be 0.0459 g/g per day, 0.429 g/g per day respectively. 3. The appropriate PH value is 6.5～8.6. The earthworm number decreased obviously if PH value exceeds this range. 4. The material conversion rate is largest when C/N ratio is 20 and in 20°C.5. According to PH value and C/N ratio, the optimal ferment period of municipal solid waste is 18 days, it can satisfy the need of worms.