生物滤池A/O工艺处理焦化废水研究

Study on Treatment of Coking Wastewater by A/O Process of Biological Filter

采用具有特定载体的生物滤池A／O工艺处理焦化废水．废水含有高浓度酚类化合物，COD和NH4^＋ -N分别约2000mg/L和260mg／L．在HRT为60h时，COD和NH4^＋ -N平均去除率分别达到了87．0％和91．6％，最佳条件下出水NH4^＋ -N浓度达到了国家一级排放标准．生物滤池A／O工艺高效去除了原水中小分子质量的酚类化合物，出水中有机物主要分布于10000～30000相对分子质量范围，且含有--OH、C--O、C--O等官能团和苯环结构．由于载体的支持和保护作用，大量微生物固定于载体的表面和内部，实现了COD、NH4^＋ -N和TN的同时去除．生物滤池A／O系统具有运行稳定、抗冲击等优点．

Coking wastewater was treated by A/O process of biological filter with a special kind of cartier. The wastewater contained much more phenolic compounds with about 2 000 mg/L of COD and 260 mg/L of NH4^＋ -N. The A/O system could achieve average removal efficiencies of 87.0% and 91.6% for COD and NH4^＋ -N, respectively, when HRT was 60 h. The NH4^＋ -N in the effluent could meet the first level of National Discharge Standard at optimal operation condition. The phenolic compounds with low molecular weight could be fully biodegraded by A/O system. The organic compounds in the effluent were in the relative molecular weight range of 10 000 - 30 000 and contained --OH, C--O , C--O and phenyl group. Based on the support and protection of the carrier, a great number of microorganisms adhered arid immobilized on the outer and inner surface of carrier, which contributed to a simultaneous removal of COD, NH4^＋ -N and TN. The A/O system biological filter showed a characteristic of steady performance and resistance ability during the operation period.