Abstract
The purpose of this paper is to solve the problem of the waste water produced by pharmaceutical industry. However, the general biochemical treatment system is difficult to meet its processing requirements. As the water intake of regulating tank fluctuates greatly, the amount of coagulant is often added according to the experience in the coagulation pretreatment of pharmaceutical waste water, which makes the quality of coagulation effluent unstable. Based on mathematical model, the waste water treatment process of pharmaceutical factory is taken as an example, while the effect of coagulation as pretreatment process on pharmaceutical waste water treatment is analyzed. Meanwhile, a mathematical model is established to judge the dosage of coagulant to prevent water quality fluctuation of coagulation effluent. The experiment ensures that the effluent quality is stable within a range and reduces the impact on subsequent biochemical systems. The results show that the coagulation effect of waste water with high CODcr and high turbidity is greater than that of low load and low turbidity waste water. In addition, coagulation has a fairly good removal effect for turbidity. Based on the above findings, we concluded that the PAC dosage calculated by the model can stabilize the CODcr value of the condensate effluent in the 1600mg/L-1800mg/L range, and complete the stable mission of the effluent CODcr index.
