滇池人工湿地系统进水前处理的研究

目的]为减轻人工湿地堵塞状况。方法]采用硅藻土与助凝剂(PAM)复配对滇池湿地系统2类不同入水进行预处理,最后给出相关经济性分析。结果]结果表明:在目前海河水和福保村生活污水的水质条件下,当硅藻土的投加量应达到120 mg/L,PAM投量为0.3 mg/L时,出水TP达到一级B的1 mg/L要求(GB18918-2002),而当硅藻土投加量为40 mg/L时,出水SS达到一级B 20 mg/L的要求。入水经过前处理,使得最大限度减轻了是湿地系统后续潜滤池堵塞隐患,保证高负荷湿地系统连续运转。结论]改性硅藻土前处理技术可利用较少的投资和运行费用达到降低后续湿地堵塞压力,且处理所得污泥可回收利用,毒性远低于铁盐铝盐产生的化学污泥,是符合我国国情的前处理技术。

Results and Analysis of Influent Water Pretreatment in Artificial Wetland System of Dianchi Lake

Objective] The aim of the research was to alleviate the clogging status of artificial wetland.Method] 2 kinds of different water-entry in wetland system of Dianchi lake were pretreated by combining diatomite with coagulant aid(PAM).Finally the relative economic analysis was given.Result] Under present water quality conditions of Haihe River water and the domestic sewage in Fubao village,TP of effluent water reached Class I-B demand(1 mg/L ) of GB 18918-2002 when the adding amount of diatomite should reach 120 mg/L and the adding amount of PAM was 0.3 mg/L.SS of effluent water reached Class I-B demand(20 mg/L) when the adding amount of diatomite reached 40 mg/L.Influent water pretreatment alleviated hidden clogging troubles of subsequent potential filter pools in wetland system to the maximum extend and ensured the continuous running of high-load wetland system.Conclusion] Pretreatment technology with modified diatomite can reduce the clogging pressure of subsequent wetland by less investment and operation cost.And the gained sewage sludge from treatment can be recycled and its toxicity was greatly lower than that of chemical sewage sludge produced by ferric salt and aluminium salt,which was the pretreatment technology in accordance with Chinese actual conditions.