Abstract:

Two Anaerobic Filter (AF)-Biological Aerated Filter (BAF) systems, one for bioaugmented system and another for control system, were set-up to treat coking wastewater, and the influence of the introduced nitrogenous heterocyclic compounds on the reactor performance was investigated. The results showed that the COD removal efficiency of AF in both bioaugmented and control system was 35% while the BOD₅/COD increased from 0.33 to 0.59 after the treatment of AF in both systems. When 100 mg/L carbazole was introduced to the influent, the COD removal efficiency of the bioaugmented AF remained 35% and BOD₅/COD of the bioaugmented AF effluent decreased to 0.53, while the COD removal efficiency of the control AF declined to 23% and BOD₅/COD of the control AF effluent dropped to 0.45. When 100 mg/L quinoline and 50 mg/L pyridine were introduced to the influent simultaneously, the COD removal efficiency of the bioaugmented AF decreased to 27% and BOD₅/COD of the bioaugmented AF effluent decreased to 0.48, while the COD removal efficiency of the control AF declined to 12% and BOD₅/COD of the control AF effluent decreased to 0.38. Moreover, the removal efficiencies of the introduced carbazole, quinolone and pyridine were 83%, 91% and 88% respectively after bioaugmented AF treatment, while the removal efficiencies of the introduced carbazole, quinolone and pyridine were 57%, 66% and 55% respectively after the control AF treatment. This indicated that the bioaugmented system was more effective to resist the impact of high concentration nitrogenous heterocyclic compounds. The GC-MS analysis of the bioangmented AF effluent indicated that the introduction of nitrogenous heterocyclic compounds led to an increment of the alkane and benzoic esters in the AF effluent. This study revealed the impact of the high concentration of organic compounds on A/O system for treating coking wastewater.

Key words: coking wastewater, nitrogenous heterocyclic compounds, biodegradability, bioaugmentation, AFBAF system

摘要：

采用生物强化及未生物强化厌氧滤池(AF)–曝气生物滤池(BAF)两套反应器处理焦化废水, 并研究外加杂环化合物咔唑、喹啉和吡啶对工艺处理效果的影响。结果表明: 未添加杂环化合物, 两套AF-BAF反应器系统厌氧段COD的去除率均为35%, 厌氧出水可生化性从进水的0.33上升为0.59; 添加100 mg/L咔唑后, 生物强化反应器厌氧段COD去除率仍维持在35%, 出水可生化性变为 0.53, 未生物强化反应器厌氧段COD去除率降为23%, 出水可生化性降为 0.45; 同时添加100 mg/L喹啉和50 mg/L吡啶, 生物强化反应器厌氧段COD的去除率降为27%, 出水可生化性降为0.48, 未生物强化反应器厌氧段COD去除率降为12%, 出水可生化性降为0.38。生物强化有效地提高了反应器对高浓度杂环化合物的耐冲击能力。高效液相色谱结果显示, 外加的咔唑、喹啉和吡啶在生物强化反应器厌氧段的去除率可达83%, 91%和88%, 而在未生物强化反应器厌氧段的去除率仅为57%, 66%和55%。气相色谱–质谱分析表明, 外加杂环化合物导致生物强化反应器厌氧出水烷烃与含苯环酯类物质种类的增加。研究结果揭示了高浓度杂环化合物咔唑、喹啉和吡啶负荷对A/O工艺处理焦化废水效果的影响。

关键词: 焦化废水, 含氮杂环化合物, 可生化性, 生物强化, AF-BAF 工艺