PSAF混凝剂在植物油脂废水处理中的应用

Application of PSAF coagulant in the treatment of vegetable oil wastewater

用煤矸石及硫铁矿烧渣作原料制备了一种高效复合混凝剂聚硅酸铝铁（PSAF），并将其用于植物油脂废水的处理。研究结果表明，在较宽的pH范围内，PSAF混凝剂对废水均有很好的处理效果。在常温下，pH为6．0～7．0，混凝剂的投加量为80mg／L条件下，SS、CODCr和油脂的去除率分别为90．5％、79．7％和84．3％。与传统混凝剂PAC和PPS相比，PSAF混凝剂具有较好的混凝沉降性能。此法具有混凝沉降速度快、破乳性能好、处理废水费用低等特点。还探讨了混凝剂PSAF对油脂废水的混凝沉降机理。

A new type of effective complex coagulant polysilicate aluminum ferric salt（PSAF） was prepared from coal gangue and pyrite slag and used as coagulant in the treatment of vegetable oil wastewater. The results showed that PSAF had a good coagulation effect in the treatment of vegetable oil wastewater in a wide range of pH value. The removal rate of SS, CODCr and vegetable oil was 90.5%, 79.7% and 84.3% respectively in the conditions where tenaperature was normal, pH value was 6.0 - 7.0 and dosage of the coagulant was 80 mg/L. In comparison with the conventional coagulants, such as PAC and PFS, the coagulation performance of PSAF was the best. The remarkable characteristics of this method were higher settlement rate, better emulsion- breaking and lower cost of treatment. The coagulation mechanism of PSAF coagulant in the treatment of vegetable oil wastewater was also discussed.