曝气生物滤池处理含氟苯酚化工废水

Treatment of Fluorophenols Wastewater by Biological Aerated Filter

采用曝气生物滤池工艺对含氟苯酚工业废水进行处理研究,主要考察了气水比、水力负荷、进水pH对处理效果的影响.氟苯酚和可吸附有机氟去除率随着气水比升高而增大,但气水比达到6:1后又降低,最佳气水比为6:1.随着水力负荷增大,有机物去除率减小,确定最佳水力负荷为0.58 m3/(m2·h).进水pH在5.0～9.0范围内,BAF对氟苯酚的去除率都在90%以上,当 pH达到9.5时去除率急剧降低到30%左右.当进水浓度为40 mg/L,气水比为6:1,水力负荷为0.58 m3/(m2·h),pH 6.5,出水效果稳定,出水氟苯酚、可吸附氟代有机物、氟离子含量均达到了<污水综合排放标准>(GB8978-96)一级标准.氟苯酚生物降解符合一级动力学.

Study on the treatment of fluorophenols wastewater by biological aerated filter was systematically conducted. The influence of hydraulic loading, ratio of gas to liquid, and pH value to the process was discussed. The removal rates of fluorinated phenol and absorbable organic halogen increased accompanied with increasing of ratio of gas to liquid, then decreased when the ratio of gas to liquid reached 6： 1. The removal rate of organic compounds decreased when the hydraulic loading increased, the optimal hydraulic loading of 0.58 m^3/ （m^2 ·h） was fixed. When the pH value of influent was 5.0-9.0, the removal rate was up to 90%, while the removal rate decreased sharply to 30% when the pH value of influent was 9.5. Under the conditions that the ratio of gas to liquid was 6： 1, the hydraulic loading was 0.58 m^3/ （m^2 · h） and the pH value was 6.5, the average concentration of fluorophenols, absorbable organic halogen and fluoride ion could meet the requirement of Class A of Integrated Wastewater Discharge Standard （GB8978-96） .