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| Study on regulation of sewage sludge water content by water retaining agent at the initial stage of composting |
| Received:May 18, 2017 |
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| KeyWord:sewage sludge;composting;water-retaining agent;moisture adjustment |
| Author Name | Affiliation | E-mail | | LI Yu-he | Jiangsu Service Center for Agricultural Environment Security, Yangzhou 225127, China | | | HU Wei | Jiangsu Service Center for Agricultural Environment Security, Yangzhou 225127, China | | | QIN Duan-duan | Jiangsu Service Center for Agricultural Environment Security, Yangzhou 225127, China | | | FANG Yu-jing | Jiangsu Service Center for Agricultural Environment Security, Yangzhou 225127, China | | | WANG Xiao-bing | Jiangsu Service Center for Agricultural Environment Security, Yangzhou 225127, China
Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing 210095, China | | | WANG Xiao-zhi | Jiangsu Service Center for Agricultural Environment Security, Yangzhou 225127, China
Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing 210095, China | | | FENG Ke | Jiangsu Service Center for Agricultural Environment Security, Yangzhou 225127, China
Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing 210095, China | fengke@yzu.edu.cn |
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| Abstract: |
| The high water content of sewage sludge could compromise temperature increases during the fermentation process, which is an obstacle for its recycling use. Water retaining agent (WRA) is a new type of functional polymer material, which could absorb up to a thousand times its own weight in water. In the present study, polyacrylamide, which can absorb as much as 75.3 times its own weight of water in the sewage sludge, was used as a common WRA to adjust the initial moisture content of compost piles. To implement the experiment, first, sewage sludge and sawdust were mixed to achieve a carbon (C) to nitrogen (N) ratio of 16:1. WRA was then mixed with compound feedstock at 0.614%, 0.456%, 0.423%, 0.377%, and 0% on a weight basis. In this way, the initial compost pile water contents of 46%, 54%, 56%, 58% and 68%were obtained, respectively. In the composting process, the parameters measured include temperature, pH, electrical conductivity (EC), maturity index (GI) and contents of organic matter, total nitrogen (TN), ammonium-N (NH4+-N), nitrate-N (NO3--N) of the compost piles. The results showed that a suitable moisture condition for the aerobic fermentation of sewage sludge could be created using WRA in the composting. The most appropriate initial moisture content was 54% for optimum compositing, which promoted a temperature increase and the transformation of nutrients during fermentation, and facilitated the formation of good physical and chemical properties of products. Thus, for specific feedstock with known C/N ratios, the required dose of WRA could be calculated to obtain optimum theoretical moisture contents for the subsequent fermentation process. |
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