黄河兰州段湿地景观水体净化处理及循环再生利用研究

黄河流域仅短期内抑制污染物，无法彻底分解污染物，导致水体净化和循环再利用效果差，提出黄河兰州段湿地景观水体净化处理及循环再生利用方法。通过种植旱伞草与鸢尾等植物，添加65%炉渣、25%砖块、10%砾石的填料，布设湿地景观，净化处理水体；利用厌氧池与缺氧池等一系列装置分解废水污染物，完成水体循环再生利用。试验表明，布设黄河兰州段湿地景观，有效净化处理水体内的化学需氧量、总磷、硝态氮，夏季指标的去除率高于冬季；布设黄河湿地景观，有效净化处理水体内的氨氮，冬季氨氮去除率高于夏季。水力负荷对化学需氧量、总磷的净化处理效果影响小；水力负荷越小，硝态氮的净化效果越佳；当水力负荷超过10 m3/（m2〖KG-*2〗·〖KG-*3〗d）时，氨氮的净化效果越佳。

Study on purification and recycling of wetland landscape water in Lanzhou Section of the Yellow River

The Yellow River basin can only inhibit pollutants in a short period of time,and cannot completely decompose pollutants,resulting in poor water purification and recycling.Therefore,the methods of purification and recycling of wetland landscape water in Lanzhou section of the Yellow River are proposed.The wetland landscape is arranged to purify and treat the water body by planting plants such as dry umbrella grass and iris,adding 65% slag,25% bricks and 10% gravel as fillers.A series of devices such as anaerobic tank and anoxic tank are used to decompose wastewater pollutants and complete water recycling.The experiment shows that the wetland landscape in Lanzhou section of the Yellow River can effectively purify the chemical oxygen demand,total phosphorus and nitrate nitrogen in the water body.The removal rate of indicators in summer is higher than that in winter.The Yellow River wetland landscape is arranged to effectively purify and treat the ammonia nitrogen in the water body.The ammonia nitrogen removal rate in winter is higher than that in summer.Hydraulic load has little effect on COD and TP purification.The smaller the hydraulic load,the better the purification effect of nitrate nitrogen.When the hydraulic load exceeds 10 m3/（m2〖KG-*2〗·〖KG-*3〗d），the purification effect of ammonia nitrogen is better.