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| Influence of water content on the maturity and content of microcystin in cyanobacteria composting |
| Received:August 21, 2019 |
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| KeyWord:cyanobacteria;aerobic composting;humus;microcystin |
| Author Name | Affiliation | E-mail | | WANG Jing-jing | School of Resources and Environmental Engineering, Anhui University, Heifei 230601, China | | | DENG Wei | School of Resources and Environmental Engineering, Anhui University, Heifei 230601, China | | | FANG Meng-ying | School of Resources and Environmental Engineering, Anhui University, Heifei 230601, China | | | LI Yu-cheng | School of Resources and Environmental Engineering, Anhui University, Heifei 230601, China | Li-yucheng@163.com | | WU Juan | School of Resources and Environmental Engineering, Anhui University, Heifei 230601, China | | | ZHANG Xue-sheng | School of Resources and Environmental Engineering, Anhui University, Heifei 230601, China | | | WANG Ning | School of Resources and Environmental Engineering, Anhui University, Heifei 230601, China | |
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| Abstract: |
| To explore and optimize the process parameters of decomposition and harmless treatment of cyanobacteria, outdoor composting was conducted, in which rice husk and mushroom residue were used as stuffing. The objective of this study was to analyze the composting speed and degradation of microcystin(MC), where the initial water content(50%, 55%, and 60%)was added during composting. Results showed that the total nutrient content met the requirements of the national industry standard of organic fertilizer after 48 d of composting of cyanobacteria. In addition, the germination index in these treatments was more than 85%. At the end of composting for all three treatments, the humus carbon content decreased by 23.16%, 21.71%, and 19.50%, the humic acid carbon content increased by 69.40%, 60.58%, and 43.89%, and the fulvic acid carbon content decreased by 50.30%, 50.09%, and 40.36%, respectively. In addition, the ratio of humus to fulvic acid was increased by 2.85, 2.94, and 2.23(ranging from 141.27% to 240.81%), respectively. After 48 d of composting, the MC content decreased by more than 95%, and the content was less than 1 μg·kg-1. The trends in the degradation rates of MC-LR were similar to those of MC-RR, but the rate of MC-RR was higher than that of MC-LR under each treatment. In conclusion, the treatment of W50% and W55% is conducive to the formation of humic substances and improved maturity of the stack. In addition, the treatment of W55% showed the best degradation effect on MC during the composting of cyanobacteria. |
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