新型气浮设备去除污水厂二沉池出水TP和SS中试

Removal of TP and SS from Effluent of Secondary Sedimentation Tank with Novel Air Flotation Equipment

采用自主设计研发的新型气浮设备对北方某市污水厂二沉池出水进行深度处理,考察了混凝剂种类、水温、回流比、表面负荷等对去除TP和SS的影响。结果表明,在一定的表面负荷和回流比下,二沉池出水经新型气浮设备处理后TP浓度低于0.3 mg/L,且不受温度影响。在仅投加PAC时,该设备即可维持出水SS低于20 mg/L。相较于高效沉淀池,采用气浮处理二沉池出水的运行费用低,经济效益好,可作为城市污水厂深度处理工艺。

A novel air flotation process was developed and used for advanced treatment of the effluent from the secondary sedimentation tank of the municipal wastewater treatment plant. The effects of coagulant type, water temperature, reflux ratio and surface load on the removal of TP and SS in the novel air floatation equipment were investigated. The results showed that the effluent concentration of TP was lower than 0.3 mg/L after the advanced treatment, and the TP concentration in effluent was stable and was not affected by the temperature. The novel air floatation equipment could reduce SS and maintain the effluent SS below 20 mg/L by only adding PAC. Moreover, compared with high-efficiency sedimentation tanks, the novel air flotation process had low operating costs and good economic benefits.