气动絮凝强化处理城镇污染河水

为减轻水体污染,缓解环境压力,对典型城镇污染河水进行气动絮凝实验研究。在设定的实验条件下,以某大学中水站格栅后生活污水稀释配制的水样来模拟典型城镇污染河水并作为实验研究对象,以无机高分子聚合物聚合氯化铁铝(PFAC)为絮凝剂,有机高分子聚合物聚丙烯酰胺(PAM)为助凝剂。在此基础上,以浊度、COD、总磷和溶解氧为测定指标,采用连续流的方式进行一系列实验研究。实验结果显示:采用微孔曝气头进行曝气,当混合阶段充气量及絮凝池第一格、第二格充气量分别为1.778 m3空气/m3处理污水量、1.444 m3空气/m3处理污水量和0.622 m3空气/m3处理污水量时,城镇污染河水中污染物的去除效果最佳。其浊度、COD、TP的去除率可分别达93.6%、68.6%和73.5%。此外,在处理效果良好的前提下,沉淀池出水口出水溶解氧含量均能保持在2.29 mg/L左右。

Enhanced treatment of polluted river water in cities and towns by pneumatic flocculation

In order to alleviate the water pollution,ease the pressure on the environment,the experiment of pneumatic flocculation was applied in the polluted river water of typical cities and towns.Under the conditions of setting experiment,the polluted river water of typical cities and towns which was simulated by diluted sewage water from some university’s reclaimed water station grid as study object,inorganic high polymer polymerization ferric chloride aluminum(PFAC) as flocculant agent,organic high polymer polyacrylamide(PAM) as coagulant agent.On this basis,setting turbidity,COD,total phosphorus and DO as index,a series of experiments were conducted in the continuous flow way.The experimental results show that when using microporous aeration,the aeration levels of mixed stage,the first stage of flocculation and the second stage were 1.778,1.444,0.622 m3 air/m3 processing wastewater quantity,respectively,the removal effect of pollutants in sewage water was the best.The turbidity,COD and total phosphorus are 68.6%,93.6% and 73.5%,respectively.Besides,the mode of aeration can keep the dissolved oxygen content of sedimentation tank’s effluent at 2.29 mg/L without influencing the treatment effect.