Enhanced Nitrogen Removal of Steel Rolling Wastewater by Constructed Wetland Combined with Sulfur Autotrophic Denitrification
| Autor: | Xiaohu Lin, Jingcheng Xu, Juwen Huang, Tao Zheng, Danyan Sun, Jie Ren, Yunhui Gu |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Denitrification
constructed wetland Hydraulic retention time advanced treatment 0208 environmental biotechnology Geography Planning and Development TJ807-830 chemistry.chemical_element 02 engineering and technology recycling sulfur autotrophic denitrification 010501 environmental sciences Management Monitoring Policy and Law engineering.material TD194-195 01 natural sciences Renewable energy sources GE1-350 ecological treatment Turbidity 0105 earth and related environmental sciences Lime Environmental effects of industries and plants Renewable Energy Sustainability and the Environment Pulp and paper industry Sulfur 020801 environmental engineering Environmental sciences chemistry Wastewater Constructed wetland engineering Environmental science Sewage treatment steel rolling wastewater |
| Zdroj: | Sustainability Volume 13 Issue 3 Sustainability, Vol 13, Iss 1559, p 1559 (2021) |
| ISSN: | 2071-1050 |
| DOI: | 10.3390/su13031559 |
| Popis: | Constructed wetlands (CWs), an ecological treatment technology, is suitable for advanced treatment, but has an unsatisfying denitrification performance for steel rolling wastewater with low C/N ratio. This study combined sulfur autotrophic denitrification (SAD) with conventional constructed horizontal subsurface flow wetlands to treat steel rolling wastewater, exploring the feasibility of applying SAD to enhance the denitrification performance of CWs. The reactor consists of two sections, one filled with manganese sand and gravel (HFC) and another filled with ceramic, sulfur, and lime (HFSAD). Results showed that HFC had a good performance on removing turbidity, DO, COD, and TP, while the average removal efficiency of total nitrogen (TN) in HFC was just 25.6%. On this basis, HFSAD could remove 45.6% of TN subsequently, whose denitrification rate was 4–6 times as high as that of HFC. Increasing hydraulic retention time could improve removal efficiency of contaminants in HFC and HFSAD in different degrees. The analysis of microbial community structure, observation results of fillers and monitored sulfate all provided proofs for the occurrence of SAD. CWs combined with SAD can be applied in the treatment of steel rolling wastewater with low carbon, which can provide reference for ecological wastewater treatment, water saving, and recycling in iron and steel enterprises. |
| Databáze: | OpenAIRE |
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