臭氧强化混凝在酵母废水深度处理中的应用研究

摘要

Ozone enhanced coagulation has been used for the advanced treatment of the secondary effluent of yeast wastewater. The results show that when the dosage of O3 is 120 mg/L and FeCl3 0.5 g/L,the COD removing rate is 65.0%. Compared with the experimental results of that having the same dosages ,and the process by coagulation first and then ozonation next,19.2%of COD removing rate can be increased,and 50%or more of chemical sludge yield can be decreased. Compared with the results of the process by coagulation only ,more than 60%of coagulant dosage can be reduced. The wastewater treatment cost of ozone enhanced coagulation per ton is the lowest. When oxygen source is used,the treatment cost is CNY2.5/t. Compared with the treatment costs of the processes by coagulation first and ozonation next and by coagulation only,CNY0.7/t and CNY1.3/t can be reduced,respectively.%采用臭氧强化混凝的方法对酵母废水二级出水进行深度处理，结果表明，臭氧、三氯化铁投加量分别为120 mg/L、0.5 g/L时，COD去除率为65.0%，与相同投加量下先混凝后臭氧氧化的实验结果相比，COD去除率可提高19.2%，化学污泥产生量可减少50%以上；与单独混凝实验相比，可减少60%以上的混凝剂用量。臭氧强化混凝的吨水处理费用最低，采用氧气源时，吨水处理费为2.5元，分别比先混凝后臭氧氧化和单独混凝减少0.7、1.3元/t。