混凝预处理大豆蛋白废水实验研究

Pretreatment of soybean protein wastewater by coagulation

大豆蛋白废水是一种较难处理的高浓度有机废水,为降低后续生物处理单元的负荷,本研究选取多种混凝剂,如硫酸铝、氯化铁、聚合氯化铝(PAC)、聚合硫酸铁(PFS)、四氯化钛和造纸污泥絮凝剂(PSF)等,采用混凝工艺对其进行了预处理,并对处理效果进行了对比,同时应用聚二甲基二烯丙基氯化铵(PDMDAAC)、聚丙烯酰胺(PAM)和浒苔等做助凝剂分析了预处理效果.结果表明,PAC为混凝剂,PAM为助凝剂,投加量分别为0.3g/L和10mg/L时,既能取得较好的混凝预处理效果,也较符合实际应用要求.

As a kind of concentrated organic wastewater, soybean protein wastewater is difficult to be safely disposed. In order to reduce organic loading of the subsequent bio-treatments, Al2（SO4）3, FeCl3, PAC, PFS, TiCI4 and flocculant synthetized by paper mill sludge （PSF） were utilized as coagulants for pretreatment by of soybean protein wastewater. The application and performance of PDMDAAC, PAM and enteromorpha as coagulant aids were also examined in this research. Experimental results showed that efficient coagulation performance could be achieved by PAC as coagulant and PAM as coagulant aid at dosages of 0.3g/L and 10mg/L, respectively.