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Co-composting of flower waste and cattle manure in pilot scale

ZHANG Xiangfeng, WANG Hongtao, ZHOU Huiyu, ZHANG Yian, NIE Yongfeng (Dept. of Environmental Science and Engineering, Tsinghua University, Beijing 100084)  
Co-composting of flower waste and cattle manure were studied in pilot scale. The first stage is aerobic static bed of composting based on temperature feedback and control via aeration rate regulation, which lasted for 20?d the second stage is window composting, of about 40?d. Changes of temperature, water content, pH, organic matter, wet weigh, dry weigh, volume, wet bulk density and dry wet density were studied. Results showed that co-composting of flower waste and cattle manure, using aerobic static bed based temperature feedback and control via aeration rate regulation, could stabilize organic matter and removal water rapidly. At first stage, the pile was insulated and temperatur of 55℃ or above was maintained for 10?d. The highest temperature was up to 69℃. Which was high-enough to kill pathogens. during the process of composting, water content of pile decreased from 70% to 32.4%. The accumulated removal of water is about 87.4%. Organic matter was degradeted from 73% to 57%.The accumulated degradation of organic matter was about 87.4%.The decreases of wet weigh,dry weigh and volume of pile were about 72.7%,38.7% and 55%.The value of pH increased to about 8.0 quickly at the beginning and was kept till the end of first stage.It returned to about 7 at the end of second stage.
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