焦化废水降解优势菌的驯化及其降解特性研究

摘要

We screened six dominant bacteria from activated sludge in aeration pool of coking wastewater treatment unit.Through comparison of the degradation properties of six dominant bacteria to coking wastewater,we successfully obtained a dominant bacterium with strong degradation ability,of which the remov-al rate of COD,volatile phenol,and chromaticity was 75.30%,59.07%,and 45.20%,respectively.The growth curve analysis of the dominant bacterium indicate that the best process parameter of F/M value should between 3 000 kgBOD5·(kgMLSS·d)-1and 60 000 kgBOD5·(kgMLSS·d)-1.The results of single-factor experi-ment and orthogonal experiment show that the effect of each factor on the degradation ability of coking wastewater is temperature,ventilation volume,and wastewater pH value.Under the optimal degradation condi-tions as follows:the wastewater pH value of 7,the temperature of 30 ℃,and the ventilation volume of 0.8 L· min-1,the treatment efficiency of the dominant bacterium to coking wastewater is the best with COD removal rate of 88.14%.%从某焦化废水处理站曝气池的活性污泥中筛选到 6 株优势菌,通过比较 6 株优势菌对焦化废水的降解特性,最终筛选到 1 株具有较强降解能力的菌株,该菌株对焦化废水的COD去除率为 75.30%、挥发酚去除率为 59.07%、色度去除率为45.20%.优势菌生长曲线分析表明,最佳工艺参数 F/M值在 3000~60 000 kgBOD5·(kgMLSS·d)-1之间.单因素实验和正交实验结果表明,各因素对焦化废水降解能力的影响大小依次为:温度>通气量>废水 pH 值,最佳降解环境为废水 pH 值 7 、温度 30 ℃、通气量 0.8 L·min-1,此时,对焦化废水的处理效果最佳,COD去除率达到88.14%.