Abstract:

In order to study the performance of electroosmotic dewatering process in high salinity organic pharmaceutical wastewater sludge and further understand the electroosmotic dewatering process of chemical sludge, the deep dewatering of filtrating dewatered high salinity organic pharmaceutical wastewater sludge by electroosmotic technology was investigated in this study. The effects of initial pH value on moisture content, current, conductivity, pH, zeta potential and energy consumption of the anode and cathode sludge during the electroosmotic dewatering process were evaluated, and the feasibility of electroosmotic dewatering process of high salinity organic pharmaceutical wastewater sludge was verified. The mechanism of electroosmotic dewatering of chemical sludge was discussed. The results showed that when the pH values of sludge cake was 2,3 and 4, respectively, zeta potential was positive, and electroosmotic flow was reversed, so it was unable to dehydrate. When pH increased to 5, zeta potential became negative, electroosmotic flow was removed from the cathode, and the moisture content of sludge was decreased from 53.2% to 44.8%. However, the dewatering amount decreased when the pH increased to 6. The conductivity of sludge decreased with the pH increasing. When the pH was 5, the initial current reached the maximum value. When the moisture content of sludge decreased to 45.5% after dewatering for 15min, the energy efficiency was the highest.

Key words: pharmaceutical wastewater, chemical sludge, electro chemical, electro-osmotic dewatering, moisture content

摘要：

为研究高盐高有机制药废水污泥的电渗透脱水效果，深入认识化学污泥的电脱水过程，本文采用电渗透高干脱水技术对经抽滤脱水的高盐高有机制药废水化学污泥进行深度脱水，考察了泥饼初始pH的改变对污泥电渗透高干脱水过程中阴阳极污泥的含水率、电流、电导率、pH、zeta电位与能耗的影响，验证了对高盐高有机制药废水污泥实行电渗透高干脱水的可行性，解析了化学污泥电渗透脱水过程的机制。结果表明，泥饼pH为2、3、4时，zeta电位为正值，电渗流反向流动，无法脱水；pH增至5时，zeta电位为负值，电渗流从阴极脱除，污泥含水率从53.2%降至44.8%，脱水效果最好；但pH增至6时，脱水量有所降低。污泥电导率随pH的增加而降低。pH为5时初始电流最大。脱水15min时，即污泥含水率降至45.5%时，能源利用率最高。

关键词: 制药废水, 化学污泥, 电化学, 电渗透脱水, 含水率