组合表面流湿地处理化工区污水厂尾水的工艺设计

Process design of combined surface flow wetland to treat tail water from wastewater treatment plant in chemical industry park

采用“配水曝气区-砾石滩-芦苇区1-水生植物区-芦苇区2”的组合表面流湿地处理化工区污水厂尾水。工程正式运行以来,水质净化效果方面,湿地出水中化学需氧量(COD)、氨氮(NH_(3)-N)、总氮(TN)、总磷(TP)分别为(28.9±5.82)、(0.195±0.093)、(2.83±1.00)、(0.145±0.055)mg/L,去除率分别为(12.62±12.74)%、(20.70±21.11)%、(49.53±13.05)%、(44.52±14.55)%;COD主要在砾石滩去除,NH_(3)-N、TN、TP主要在芦苇区2去除;氯化物质量浓度3 200 mg/L时,湿地仍能正常运行。生态效应方面,人工湿地昆虫种类超过60种,鸟类种数接近35种,生物多样性显著提高。

The treatment of tail water from wastewater treatment plant in chemical industry park was carried out using combined surface flow wetland of“water distribution and aeration zone-gravel zone-No. 1 reed zone-aquatic plant zone-No. 2 reed zone”. Since formal operation,in terms of water purification effects,the average concentration of COD,NH_(3)-N,TN and TP in the effluent water were(28.9±5.82)mg/L,(0.195±0.093)mg/L,(2.83±1.00)mg/L and(0.145±0.055)mg/L respectively,the average removal rates were(12.62±12.74)%,(20.70±21.11)%,(49.53±13.05)% and(44.52±14.55)% respectively. COD was mainly removed in the gravel zone,while NH_(3)-N,TN,TP were mainly removed in the No. 2 reed zone. Wetland could run normally when the chloride concentration was 3 200mg/L. In terms of biological effect,there were more than 60 species of insects,and close to 35 species of birds in the wetland. The biodiversity was significantly improved.