| 反硝化细菌、硝酸钙和锆改性沸石联用对底泥中氮磷迁移转化的影响及硝态氮释放风险评估 |
| 摘要点击 2027 全文点击 810 投稿时间：2020-08-16 修订日期：2020-09-08 |
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| 中文关键词 底泥 反硝化细菌(DB) 硝酸钙(CN) 锆改性沸石(ZZ) 氮磷迁移转化 释放风险 |
| 英文关键词 sediment denitrifying bacteria (DB) calcium nitrate (CN) zirconium-modified zeolite (ZZ) transport and transformation of nitrogen and phosphorus releasing risk |
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| 中文摘要 |
| 本文考察了基于反硝化细菌、硝酸钙和锆改性沸石的组合技术（CN+DB+ZZ）对底泥中氮磷迁移转化的影响，并探讨了该技术的硝态氮释放风险.结果发现，单一的硝酸钙处理（CN）虽然可以有效地抑制底泥中磷的释放，但是会造成上覆水体的氨氮和硝态氮污染.硝酸钙和反硝化细菌联合处理（CN+DB）尽管可以有效地抑制底泥中磷的释放，并降低上覆水体的硝态氮二次污染风险，可是却无法有效地控制底泥中氨氮的释放.硝酸钙和锆改性沸石联合处理（CN+ZZ）虽然可以有效地抑制底泥中磷和氨氮向上覆水体的释放，但却会造成上覆水体硝态氮的二次污染.CN+DB+ZZ组合处理技术不仅可以有效地控制底泥中磷的释放，而且可有效降低底泥中氨氮的释放速率，并且与CN和CN+ZZ技术相比还可降低上覆水的硝态氮二次污染风险.CN+DB+ZZ组合技术对底泥中磷与铁同步释放的抑制、对底泥中氧化还原敏感态磷的削减、以及对底泥吸附磷酸盐和氨氮能力的增强，对于其控制底泥中磷和氨氮的释放是至关重要的.以上结果说明，CN+DB+ZZ组合技术是一种非常有希望的用于控制水体底泥中磷和氨氮释放的方法. |
| 英文摘要 |
| In this work, the influence of an integrated method based on calcium nitrate, denitrifying bacteria, and zirconium-modified zeolite (CN+DB+ZZ) on the transport and transformation of nitrogen (N) and phosphorus (P) in sediments was investigated, and the risk of nitrate release from the calcium nitrate-injected sediment was evaluated. The effects of the single calcium nitrate injection (CN), calcium nitrate, and denitrifying bacteria combined treatment (CN+DB) and the combined treatment using calcium nitrate injection and zirconium-modified zeolite capping (CN+ZZ) on the mobilization of N and P in sediment were compared, and the nitrate releasing risk of these methods was also evaluated. The results indicated that although CN treatment could effectively control the P release from the sediment, this method could not effectively control the release of ammonium-nitrogen from sediment and has a high risk of releasing nitrate-nitrogen. The CN+DB combined method not only could effectively control the liberation of sedimentary P but also reduce the risk of nitrate-nitrogen release from the calcium nitrate-injected sediment compared with the single CN method. However, the CN+DB combined method could not effectively control the release of ammonium-nitrogen from the sediment. The CN+ZZ combined treatment not only could effectively prevent the release of sedimentary P but could also greatly reduce the release of ammonium-nitrogen from the sediment. However, the CN+ZZ combined method could result in a substantial release of nitrate-nitrogen from the calcium nitrate-injected sediment. The CN+DB+ZZ combined technology could effectively control the release of P from sediment as well as greatly reduce the risk of ammonium-nitrogen release from the sediment. Furthermore, the CN+DB+ZZ combined method resulted in a significant reduction of nitrate-nitrogen released from the calcium nitrate-injected sediment compared with the CN and CN+ZZ treatment methods. The prevention of the dissolution of the P-bound iron oxide/hydroxide in the sediment, the reduction of redox-sensitive P in sediment, and the improvement of the phosphate and ammonium adsorption abilities of sediment by the CN+DB+ZZ combined method is critical to control the release of phosphorus and ammonium-nitrogen from sediment using this method. Results of this study reveal that the CN+DB+ZZ combined technology could be a promising method for the control of phosphorus and ammonium-nitrogen release from sediments. |
