基于化学和毒性分析的焦化废水生物处理技术的比较分析

CHEMICAL AND TOXICITY ANALYSIS-BASED TECHNICAL COMPARISON OF BIOLOGICAL WASTEWATER TREATMENT PROCESSES

采用传统的活性污泥(CAS)和新型生物处理技术垂直折流生化处理技术(VTBR)对实际焦化废水进行了试验室处理研究,从COD、挥发酚、有机组分等化学指标和生物毒性指标对2种工艺的处理效果进行了比较评价。结果表明,发光细菌为受试生物的毒性试验,以发光强度抑制率表征VTBR、CAS出水的毒性分别为-21.2%±9.8%、12.1%±23.7%;以藻类为受试生物的毒性试验,VTBR和CAS出水对小球藻在24 h和48 h的生长抑制率无明显差异;VTBR对废水的COD、挥发酚及毒性有机物的处理效果均优于CAS,这也表明VTBR可以作为传统生物处理过程的替代工艺之一,用来解决传统生物处理工艺对毒性去除效果不理想的问题,进而减少生化出水对接受水体的生态风险。

Conventional activated sludge （CAS） and vertical tubular biological reactor （VTBP,） as novel biological treatment technique were set-up in lab-scale to treat the industrial coking wastewater. To evaluate their performances, both chemical indexes （e.g. COD, volatile phenol and organic compounds） and biological toxicity indexes were analyzed. The bio-toxicity tests with Photobacterium phosphoreum showed that the bioluminescence inhibition of VTBR effluent was -21.2%~9.8%, while that was 12.1%~23.7% for CAS effluent. The growth inhibition tests with ChloreUa pyrenoidosa showed that there were no obvious differences between CAS and VTBR effluents. It showed that VTBR had better performance in COD, volatile phenol and organic compounds removal than CAS, which suggested that VTBR could be used as alternative of conventional biological treatment process aiming to reduce the potential ecological risk of effluents to the receiving water body.