Effects of Different Nitrogen Sources on The Treatment of Oyster Shells by Composting with Corn Starch Cake
In order to investigate the effect of composting treatment on oyster shells and explore the im-pact of various nitrogen sources on the composting process of corn starch cake and the degree of compost matu-rity in treating oyster shells,this study utilized oyster shell powder and corn starch cake as raw materials,soy-bean meal and urea as different nitrogen sources.Three treatment groups were established:CK(corn starch cake+soybean meal),DP(corn starch cake+soybean meal+oyster shell)and NS(corn starch cake+urea+oyster shell).A 35-day fermentation experiment was conducted in order to evaluate the effects.The results showed that the addition of oyster shell in the composting process resulted in slightly lower temperatures com-pared to the CK group,but the highest temperatures in both treatments were above 60 ℃.The pH values ranged from 6.79 to 7.94,and the electrical conductivity(EC)was less than 4 mS·cm-1,indicating that the ad-dition of oyster shell did not have a negative impact on the physicochemical properties of composting.At the end of composting,the maximum GI in the DP treatment group was 104％;compared with the CK group,the total humic acid content increased by 17.64％,the cumulative ammonia emissions decreased by 34.55％,and the effective calcium content increased by 37.39％.In summary,the results showed that composting oyster shells with soybean meal as nitrogen source was beneficial to composting promotes nitrogen retention,increases the content of available calcium,and improves the quality of compost products.The results of this study can provide favorable reference for the process parameters of treating oyster shells through composting.
万方数据
维普
