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| Effects of the additive ratio and aeration rate on sludge composting with airflow film |
| Received:October 28, 2021 Revised:January 17, 2022 |
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| KeyWord:sludge composting;air-flow film;additive ratio;aeration rate;nitrogen;three-dimensional fluorescence spectroscopy |
| Author Name | Affiliation | E-mail | | QIN Wei | Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | JIANG Xinru | Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China | | | LIU Minggang | Sichuan Environmental Protection Industry Group Limited Company, Chengdu 610041, China | | | LIU Yang | Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China | | | WANG Jialing | Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | JI Gaosheng | Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | XU Lishan | Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China | | | YAN Zhiying | Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China | yanzy@cib.ac.cn |
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| Abstract: |
| To explore and optimize the process parameters of airflow film composting of sludge, garden waste and maize stalks were used as additives, and through the analysis of the physicochemical indicators during the composting process and the three-dimensional fluorescence spectra of dissolved organic matter, the effects of three levels of aeration rate on nitrogen changes under three different additive ratios were studied. Compared with other piles, when the ratio of additive was 7:3:1(sludge:garden waste:maize stalks), and the aeration rate was 0.9 m3·h-1, the total nitrogen content of the pile increased by 9.65%. The relative fluorescence intensity of humic acid substances increased by 76.62%. Under these conditions, the nitrogen migrated most to the stable and available nitrogen-containing substances, and demonstrated the best composting effect. This study showed that the larger the quantity of additives added, the longer the high-temperature phase was maintained, and the better the harmless treatment effect, although the maturity effect was poorer. The aeration rate has greater impact on the stable transfer of nitrogen during the composting, and proper aeration rate can lead nitrogen transfer in a favorable direction. |
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