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| Nitrogen removal of wastewater with low C/N ratio by straw and steel slag mixed fillers |
| Received:November 14, 2023 |
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| KeyWord:straw;steel slag;nitrogen removal;denitrification process |
| Author Name | Affiliation | E-mail | | GE Guanhua | Key Laboratory of Cultivated Land Conservation in Middle and Lower Yangtze River, Ministry of Agriculture, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China | | | PAN Daxin | Green Industry Investment Co. Ltd., China Construction Third Bureau, Wuhan 430058, China | | | ZHENG Yong | Kunming Engineering Corporation Limited of Power China, Kunming 650051, China | | | XIONG Xingjun | Kunming Engineering Corporation Limited of Power China, Kunming 650051, China | | | LIN Shan | Key Laboratory of Cultivated Land Conservation in Middle and Lower Yangtze River, Ministry of Agriculture, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China | | | WANG Yan | Key Laboratory of Cultivated Land Conservation in Middle and Lower Yangtze River, Ministry of Agriculture, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China | windy@mail.hzau.edu.cn | | HU Ronggui | Key Laboratory of Cultivated Land Conservation in Middle and Lower Yangtze River, Ministry of Agriculture, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
Kunming Engineering Corporation Limited of Power China, Kunming 650051, China | |
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| Abstract: |
| To investigate the impact of crop straw and steel slag on nitrogen removal from low carbon-to-nitrogen ratio（C/N）sewage, this study employed wheat straw（W group）, rice straw（R group）, wheat straw + steel slag（WF group）, and rice straw + steel slag（RF group） as packing materials in an anaerobic circulation system for treating sewage. The effectiveness of these six different packing systems in removing nitrate nitrogen（NO3--N）was evaluated. The results demonstrated that the NO3--N removal rates for the W, R, WF, and RF groups were 94.99%, 86.70%, 98.75%, and 94.70% respectively. Compared with the WF and RF groups which utilized mixed packings of straw and steel slag, the pure straw packing systems（W and R groups）exhibited higher rates of NO3--N removal but resulted in elevated concentrations of dissolved organic carbon（DOC）during the treatment process. The presence of iron-containing compounds released from the steel slag in both WF and RF groups facilitated organic matter consumption, thereby maintaining a lower DOC concentration level throughout the treatment process to prevent potential secondary pollution caused by high DOC concentration. After comprehensive consideration, the utilization of a wheat straw + steel slag mixed filler could effectively prevent secondary pollution in the process of nitrogen removal while maintaining efficient nitrogen removal, making it more suitable for practical applications in low C/N ratio sewage treatment. |
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