SBR法处理苯胺黑药废水及其降解机理

Treatment of Aniline Aerofloat Wastewater with SBR System and Its Biological Catabolic Mechanism

为了探讨苯胺黑药废水的生物降解效果及其降解机理,采用SBR工艺对模拟苯胺黑药废水进行了小试处理研究,并采用高效液相色谱对处理过程中的中间产物进行了分析。试验结果表明,该小试工艺经过40 d的启动调试基本达到稳定运行,具有比较好的苯胺黑药处理效果,COD去除率达到64.3%,苯胺黑药的降解率为93.4%,有望用于含该类污染物的矿山浮选废水的处理。降解过程中pH从5.83升到6.60再降到6.17,其变化可能是降解过程中生成的硫氰根离子和苯胺引起的;苯胺黑药在生物降解过程中生成两种主要一级产物:苯胺和1种在好氧条件下难被生物降解的物质,该物质是造成出水COD值较高的主要原因,苯胺最终被进一步生物降解掉。

ObjectiveThis study aimed to investigate the biodegradation effect and biodegradation mechanism of aniline aerofloat wastewater. MethodSmall-scale processing of simulated aniline aerofloat wastewater was carried out with SBR （Sequencing Batch Reactor） system; intermediate products in the process were analyzed using high-performance liquid chromatography. ResultAccording to the experimental results, the small-scale process was basically stably operated after 40 days of activation and regulation, leading to relatively ideal degradation effect on aniline aerofloat, the COD removal efficiency reached 64.3% , degradation rate of aniline aerofloat reached 93.4%, which could be applied in the treatment of mine flotation wastewater containing such pollutant. During the degradation process, pH increased from 5.83 to 6.60 and then dropped to 6.17, which might be caused by the thiocyanate ions and aniline generated in the degradation process. Aniline aerofloat mainly produced two preliminary products during the biodegradation process： aniline and a substance that was difficult to be biodegraded under aerobic conditions, which was the main reason for the relatively high COD value in effluent. Furthermore, aniline was eventually biodegraded. ConclusionThis study provided basis for the development of biological treatment of flotation wastewater in China and showed great significance for the improvement of ecological environment around the mines.