关键词:

循环曝气生物滤池, 碱渣废水, 炼油厂, 生物处理

Abstract:

The spent caustic wastewater from petroleum refinery contains high concentration sulfide, phenol and oil pollutants.A novel two stage circulating biological aerated filter (CBAF) was used to treat the wastewater after dilution by water and neutralization by H₂SO₄.The factors of dissolved oxygen (DO) concentration, hydraulic retention time (HRT), nutrient, pH value, temperature and backwashing cycle, which affected the treatment efficiency of spent caustic wastewater were investigated.The experimental results showed that the average removal percentages of COD, sulfide, volatile phenol and oil pollutants were 89.3%，99.8%，93.6% and 85.7%， respectively under feasible conditions.The average removal loading rates of COD and sulfide pollutants were 8.37 kg·m^-3·d^-1 and 4.44 kg·m^-3·d^-1, respectively.The experimental results also showed that the CBAF process was a kind of high loading rate, high treatment efficiency, long backwashing cycle and low cost treatment process with a good application prospect for the treatment of spent caustic wastewater from petroleum refinery.

Key words:

循环曝气生物滤池, 碱渣废水, 炼油厂, 生物处理