An Aerated Biofilter for Treating Petrochemical Wastewater

摘要

The biofilter is one of the most important biological processes applied to treat wastewater. Research on a pilot-scale biofilter treatment of petrochemical wastewater was performed. The volume of biofilter was 1.2 L. In the experiment, the performance is measured with activated carbon, zeolite, and architecture ceramics and engineering ceramics being respectively filled in the biofilter. Hydraulic retention time (HRT), the rate of gas flow, organic loading of influent were examined in the experiment. Experimental results also showed that the optimum process conditions are follows: HRT D 1.5 hr, rate of gas flow 0.29 L/min, and organic loading of 0.74– 1.85 kg/(m~3 d). The result showed that the biofilter system exhibits a good effect on chemical oxygen demand (COD), NH3-N (ammonia nitrate) and turbidity removal, when engineering ceramics is used as packing bed of biofilter. The effluent quality can meet the standard for wastewater use.