曝气生物滤池处理生活污水抗冲击负荷能力及曝气量影响因素探究

Study on the Impact Load Capacity of Domestic Sewage Treatment by Biological Aerated Filter and the Influencing Factors of Aeration Volume

采用厌氧-缺氧-好氧(A^(2)O)+曝气生物滤池(BAF)组合工艺开展生活污水处理实验,通过调整BAF水力负荷、曝气量等方式,探究不同条件下BAF对污水化学需氧量(COD)和氨氮(NH_(4)^(+)-N)的去除效果。实验表明,在一定范围内,适度提升水力负荷有利于BAF提高COD的去除率,大部分情况下氨氮去除率能保持60%以上。短期进水负荷升高的冲击下,BAF的氨氮去除率快速降低,随着水力负荷的恢复,去除率也较快恢复。BAF停曝或曝气量小时,COD和氨氮去除效果不佳,恢复曝气后,去除率恢复较快。组合工艺中,A^(2)O出水对于BAF处理效果起到重要作用,BAF具有硝化作用良好,短期抗冲击能力强的特点,进水负荷、曝气量要保持适当范围,以保证系统良好处理效果。

The combined process of anaerobic-anoxic-aerobic(A^(2)O)+biological aerated filter(BAF)was used to carry out domestic sewage treatment experiments.By adjusting the hydraulic load and aeration rate of BAF,the removal effects of BAF on chemical oxygen demand(COD)and ammonia nitrogen(NH_(4)^(+)-N)under different conditions were investigated.Experiments show that within a certain range,moderate increase in hydraulic load is beneficial to BAF to improve the removal rate of COD,and in most cases,the removal rate of ammonia nitrogen can be maintained at more than 60%.Under the impact of short-term increase of influent load,the ammonia nitrogen removal rate of BAF decreased rapidly.With the recovery of hydraulic load,the removal rate also recovered rapidly.The removal effect of COD and ammonia nitrogen was not good when the aeration or aeration rate of BAF was small,and the removal rate recovered quickly after the recovery of aeration.In the combined process,A^(2)O effluent plays an important role in the treatment effect of BAF.BAF has the characteristics of good nitrification and strong short-term impact resistance.The influent load and aeration rate should be kept in an appropriate range to ensure the good treatment effect of the system.