Ultra high temperature aerobic composting processin treating municipal sludge
XUE Zhao-jun1, ZHOU Guo-ya2, YU Xiao-feng2, WANG Hong-chun2, WANG Yao-yuan2, ZHENG Da-wei2, JIA Fang-xu1, HUANGYu1, WANG Shu-ying1, PENG yong-zhen1
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. Penyao Environmental Protection Co. Ltd., Yixing 214205, China
The dynamic law of temperature, moisture, ammonium ion, ammonia, bacteria abundance, volatile solid(VS) and seed germination index(GI) was studied during the ultra high temperature (~80℃) aerobic composting process. Meanwhile, the translocation of microbial community structure was revealed by high-throughput sequencing technology. The results showed that the average temperature in composting process remained above 70℃ and the maximum value was 82℃. Moisture and VS were decreasing from 44.17% to 31.94% and 45.08% to 40.25% during composting process, respectively. Noticeable volume (40.95%) and mass (50.23%) reduction was acquired. The abundance of total bacteria has declined dramatically in the first cycle and then maintained a stable level. The concentration of NH4+-N was varied between 8.80 and 11.66mg/gSS. The obvious facilitation of seed germination was verified at 75 times diluted liquid extract. High-throughput sequencing results showed that above 93% of bacterial cells were lysed after composting process. The functional bacteria was belonged to phyla of Firmicutes (genera of Saccharomonospora, Bacillus, Geobacillus and Oceanobacillus) and Actinobacteria (genera of Actinomaduraand Thermobifida), which account for 83.09% of the total bacteria abundance. Finally, the stable and odorlesscompost product was achieved.
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