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| In situ microbial fermentation systems for treating human feces in rural regions with cold and water shortages |
| Received:July 06, 2022 |
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| KeyWord:In situ microbial fermentation system;cold and arid region;resource utilization;rural feces;safety evaluation |
| Author Name | Affiliation | E-mail | | CHEN Zhuobo | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Science, Beijing 100081, China | | | LI Jiabin | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Science, Beijing 100081, China | | | LI Luyao | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Science, Beijing 100081, China | | | LIU Xue | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Science, Beijing 100081, China | | | ZHU Changxiong | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Science, Beijing 100081, China | | | LUO Liangguo | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Science, Beijing 100081, China | | | QI Yuanyi | Zhangye Lanbiao Biotechnology Co., Ltd., Zhangye 734000, China | | | TIAN Lan | Zhangye Lanbiao Biotechnology Co., Ltd., Zhangye 734000, China | | | GENG Bing | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Science, Beijing 100081, China | gengbing2000@126.com |
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| Abstract: |
| We evaluated the treatment efficiencies of human feces using in situ microbial fermentation systems in cold-arid rural regions. Changes in the basic physicochemical properties, nutrient compositions, and microbial abundances of padding were explored, and the safety of waste padding was evaluated. The results showed that when four uses per day occurred, the maximum temperatures in the padding of no. F6 and F7 reached 51.66 ℃ and 50.24 ℃, respectively, in fermentation systems with a volume of approximately 66 L. Furthermore, the microbes in the padding were dominated by bacteria, showing levels of 109 – 1010 CFU · g-1. Changes in the moisture contents in the padding after different number of uses varied, with the trend first increasing and then decreasing. Following the test, the pH and total nutrient and organic matter contents in the padding conformed to the national standard（NY/T 525—2021）. The EC values of the padding were less than 2.48 mS·cm-1, revealing a low salinization risk. The GI values of the padding of systems no. F8, F3, F6, and F7 were > 80%, indicating the maturity of paddings. After the experiments, except for in system no. F1, the fecal coliform levels and mortality of ascaris eggs in the padding aligned with the national standard of GB 7959—2012. |
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