The transformation regularities of carbon, nitrogen and hunic acid during high temperature aerobic composting process
XUE Zhao-jun1, PENG Yong-zhen1, WANG Peng-yao2, ZHOU Guo-ya2, WANG Hong-chun2, JIA Fang-xu1, JING Chao2, WANG Shu-ying1
1. National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China;
2. Pengyao Environmental Protection Co. Ltd., Yixing 214205, China
This paper studied the transformation regularities of key evaluation indicators, such as carbon, nitrogen and humic acid during ultra-high temperature aerobic composting process. The results showed that SCOD increased from 23.18mg/g to 47.49mg/g and then decreased to 30.67mg/g. TOC and TN respectively decreased from 207.45mg/g and 45.40mg/g to 157.86mg/g and 38.23mg/g in the previous seven days and almost remains constant after 35days. In addition, the content of NH4+-N incrased from 9.89mg/g to 14.04mg/g, but the sum of NO2--N and NO3--N (about 0.07mg/g) was less than 2% of TN. The loss of TN was as high as 82.87%, and it mainly attributed to ammonia volatilization. Humic acid increased from 115.12mg/g to 214.11mg/g in previous seven days and alomost remains 154.47mg/g after 21days. Although E4/E6value ranged between 3.49 and 4.23, it showed an increasing trend in total. Hence, it is not suitable for maturity evaluation.
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