净水型护岸技术的探讨

在我国,污染物含量超标的城市径流雨水排入城市水体的情况比较普遍,已成为影响城市水环境的重要问题.本文提出将净水技术与护岸结构相结合的净水型护岸是一种通过生物-生态技术强化净水功能的生态型护岸.提出了分别用于净化径流雨水和入河污染物的净水箱护岸及净水石笼护岸的技术方案.通过试验分析,探讨了其作为净水型护岸的技术可行性.试验结果表明对于单层净水箱,尽管水力停留时间较短,系统对进水中的氨氮和活性磷的平均去除率都在40%以上,截留后的污水仅在净水箱中停留5d,相对进水浓度而言的氨氮和活性磷累计去除率都在75%以上.对于净水石笼结构可选择芦苇、三棱草和李氏禾等水生植物.

Investigation on water purifying revetment technology

The pollution of urban river due to drained rainfall runoff containing pollutant is an important problem widely happened to cities in China. A new kind of revetment utilizing the ecological technology to enhance the water purfying action, named water purifying revetment, is suggested. The construction is designed in the type of water purifying box or water purifying stone cage, in which plants can grow up and playing the role of purifying the rainfall runoff drained to the urban rivers. Experimental study shows that the average removal ratios of ammonia nitrogen and active phosphorous of influent for monolayer purifying box are higher than 40%, in spite of the retention duration is comparatively short. The accumulated removal ratios of aforesaid pollutions of water stored in box are higher than 75% after 5d. The effectiveness of this kind of revetment is obvious.