基于微生物载体技术的沟渠生态修复治理体系的构建及工程应用

Construction and engineering application of canal ecological restoration and treatment based on microbial carrier technology

为探索微生物载体技术在沟渠生态修复治理中的应用效果,依托西安高新区东干渠生态治理项目,基于微生物载体技术支撑的原位生态修复治理思路,构建了“底质改良+水质调控+生物滤坝+生物绳填料+微纳米曝气系统”的治理体系,开展了东干渠生态修复治理工作。工程实践表明,该治理体系能够显著降低东干渠水体主要污染物质量浓度。COD去除率约为8.30%,NH_(3)-N去除率约为61.24%,TP去除率约为57.77%。连续31 d水质指标监测结果显示,东干渠渠水主要水质指标满足《地表水环境质量标准》(GB 3838-2002)中Ⅳ类水质标准要求。Pearson相关性分析结果表明,东干渠水体COD、NH_(3)-N和TP质量浓度变化规律大致相似,这3项指标之间具有共变趋势。本研究结果可为同类沟渠生态修复治理中的实际应用提供参考。

In order to explore the application effect of microbial carrier technology in canal ecological restoration and treatment,the in-situ ecological restoration supported by microbial carrier technology was used in the ecological management project of Donggan canal,Xi'an High-Tech zone,the treatment system of“substrate improvement+water quality control+biological filter dam+biological rope filler+micro-nano aeration system”was built accordingly.The results of the project showed that the treatment system could significiantly reduce the concentration of main pollutants in water bodies of Donggan canal.The removal rates of COD,NH_(3)-N and TP were about 8.30%,61.24%and 57.77%,respectively.The water quality indicators monitoring results in 31 consecutive days showed that the main water quality indicators of Donggan canal water met the standard of category Ⅳ water quality,in Environmental Quality Standards for Surface Water(GB 3838-2002).The results of Pearson correlation analysis indicated that the mass concentrations of COD,NH_(3)-N and TP presented a roughly similar pattern,and there was a co-variation trend among these three indexes.The results of this study can provide a reference for the practical application of similar canal ecological restoration and treatment.