生物滤池A/O工艺处理焦化废水研究

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NH⁺₄-Ｎ分别约2?000 mg/L和260 mg/L.在HRT为60　h时,COD和NH⁺₄-Ｎ平均去除率分别达到了87.0%和91.6%,最佳条件下出水NH⁺₄-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10?000～30?000相对分子质量范围,且含有—OH、CO、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、NH⁺₄-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.

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

Coking wastewater was treated by A/O process of biological filter with a special kind of carrier. The wastewater contained much more phenolic compounds with about 2000 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 and 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.