溶气气浮工艺深度除磷的设计研究--以安宁市沙占河流域治理为例

Design Research of Deep Phosphorus Removal by Dissolved Gas Air Flotation Process--Take Anning City Shazhan River Basin Management as an Example

针对当前安宁市沙占河流域居民生活污水、畜禽养殖废水、种植废水及众多工矿企业废水的无序排放,垃圾随意堆放,造成河流流域水质严重破坏,特别是总磷(TP)年均值为1.72 mg/L,远高于《地表水环境质量标准》(GB3838-2002)Ⅴ类水质标准。本文采用模拟烧杯混凝实验,采用FeCl_(3)·6H_(2)O、聚合氯化铝(PAC,有效浓度为0.6%)及CaCl_(2)三种混凝药剂进行混凝烧杯实验;最终确定出最优混凝剂为有效浓度0.6%PAC;将该混凝剂与气浮沉淀一体机配合使用;对流域总磷含量为2.5mg/L的进水进行处理,最终处理后出水的总磷含量为0.2mg/L达到《地表水环境质量标准》(GB3838-2002)的Ⅲ类水质标准;因此,浓度为0.6%PAC运用于溶气气浮工艺能有效提高系统对沙占河流域中的总磷的去除效果。

The disorderly discharge of residential sewage,livestock and poultry breeding wastewater,planting wastewater,and wastewater from many industrial and mining enterprises in Shazhan River Basin of Anning City,as well as the random dumping of garbage,caused serious damage to the water quality of the river basin,especially the annual average of total phosphorus(TP)is 1.72 mg/L,much higher than the"Surface water Environmental Quality Standard"(GB3838-2002)Class V water quality standard.Aiming at theses problems,this paper carried out simulated beaker coagulation experiment by using three coagulants FeCl_(2)·6H_(2)O_(2),polyaluminum chloride(PAC,effectiveconcentration 0.6%)and CaCl_(2).Finally,theoptimal coagulant was determined to be effective concentration of O.6%PAC.The coagulant is used in combination with the air-flotation and precipitation all-in-one equipment to treat the effluent water with a total phosphorus content of 2.5mg/L,after treatment,the total phosphorus concentration of the final treated effluent was O.2 mg/L,which met the"Surface water Environmental Quality Standard"(GB3838-2002)class II water quality standard.Therefore,PAC with effective concentration of 0.6%can effectively improve the removal efficiency of total phosphorus in Shazhan River basin by coagulation-air flotation process.