LI He-nan,SUN Yong-li,HUANG Peng,et al.Redox Characteristics of Urban Water Body and Sediment Improved by Vallisneria natans[J].China Water & Wastewater,2021,37(23):28-33.
苦草改善城市水体及底泥氧化还原特征的研究
- Title:
- Redox Characteristics of Urban Water Body and Sediment Improved by Vallisneria natans
- Keywords:
- Vallisneria natans; black and odorous water body; sediment; oxidation reduction potential (ORP); pollutants reduction
- 摘要:
- 选取典型沉水植物苦草（Vallisneria natans）为研究对象，考察苦草对黑臭水体及底泥的修复效果，以氧化还原电位（ORP）作为重要评判指标进行全程监测,并同步监测水体的溶解氧（DO）、氮、磷及底泥的总有机碳（TOC）、TN等指标。结果显示，苦草对水体及底泥ORP的改善具有明显的昼夜规律，即日间ORP升高，夜间ORP降低；苦草对水体及底泥ORP的提高效果明显，其中水体的ORP可提高35.7%，底泥1、5、10 cm深度处的ORP可分别提高2.8%、19.8%、12.5%；苦草对水体及底泥中污染物的削减及控制释放效果明显，对水体中的腐殖质具有明显削减作用。
- Abstract:
- Remediation of the black and odorous water and sediment by a typical submerged plant Vallisneria natans was investigated. Oxidation reduction potential (ORP) was selected as an important index and monitored during the whole process. In addition, dissolved oxygen (DO), nitrogen and phosphorus concentrations in the water and TOC and TN contents in the sediment were monitored. The ORP of the water and sediment improved by Vallisneria natans showed an obvious day and night variation phenomenon, that was, the ORP increased in daytime and decreased at night. ORP of the water was increased by 35.7%, and ORP at the depth of 1 cm, 5 cm and 10 cm of sediment could be increased by 2.8%, 19.8% and 12.5% respectively. Vallisneria natans had obvious effects on the removal and control of pollutants in water and sediment, and the humus in water was significantly reduced.
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