Adding calcium oxide combined with calcium peroxide for strengthening rapid biological drying of dairy cattle manure.

This research explored effects of adding calcium oxide (CaO) and calcium peroxide (CaO2 ) in the rapid biological drying of dairy cattle manure. Using the static aerobic composting system, the composting experiment was carried out by means of natural ventilation combined with composting piles turned. In the presence of the CaO and CaO2, the temperature rose faster and reached the high temperature fermentation stage in advance 4-6 days during the compost. At the end of compost, the water content of CaO and CaO2 (cont.) group was decreased to 23.5% significantly. However, the diversity in four experiment group piles had little difference at the end of the compost, which only had some changes in the process of compost. In a word, it was CaO and CaO2 that would shorten the composting time, extend the high temperature stage, provide sufficient oxygen to meet the demand of the growth of aerobic microorganisms, had a good effect on dairy manure rapid drying and provided a new idea for dairy manure efficient treatment.

Author(s): Guangfei Qu, Yingying Cai, Kang He, Haijun Gao, Ruosong Xie, Xiaotian Chen, Ping Ning

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