Experimental Study on the Plasticizer Wastewater Treatment by UASB-A/O Process

摘要

Plasticizer wastewater of high concentration was experimentally studied by the process of pretreatment of acidification demulsion and Fe-C micro-electrolysis and combined process of UASB and A/O aiming at the CODcr removal in this work. The result showed that the CODo removal rate of pretreatment process arrived at 56.2% after Fe-C micro-electrolysis reaction of 160 min on the optimal condition of pH 3.5 of acidification demulsion and 1:1.2 of the Fe/C ratio, and meanwhile improved the biodegradability of wastewater. On the other hand, UASB-A/O process could afford 80-85% of the COD_(Cr)- removal rate under the optimized condition of temperature 30-35 °C, HRT 48h, pH 6.5 for UASB and HRT of aerobic zone 10-12 h, DO of about 3mg/L for A/O basin. The whole system could run at the total COD_(Cr) removal rate of 94.53-96.36%, and the system effluent COD_(Cr) was 500 mg/L or less.