摘要:
本文以实际的食堂废水为处理对象，对比考察了在不同的水力停留时间(6 h、8 h、10 h)条件下，膜生物反应器(MBR)和生物接触氧化(BCO)两种工艺对食堂废水的净化效能。试验结果表明：两种工艺对食堂废水均有较好的净化效能，其中MBR工艺出水和BCO工艺出水中动植物油浓度最低为16.4 mg/L和68.9 mg/L，动植物油的去除率分别可达99.5和%97.8%；COD的去除率均在90%以上，其出水COD浓度最低为15.7 mg/L和21.3 mg/L；两种工艺对NH3-N的去除率差异不大，出水NH3-N浓度在1 mg/L以下；TP去除率均在80%以上，出水TP浓度在0.4 mg/L左右。TN的去除率不够理想，仅为20%左右。在不同的HRT下，两种组合工艺对NH3-N和TN的去除率差异不大，而TP在高HRT条件下的去除率不稳定，因此确定MBR和BCO两种工艺较为适宜的HRT为6 h。
In this paper, the actual
canteen wastewater was treated with membrane bioreactor (MBR) and biological
contact oxidation (BCO), and the treatment efficiency of canteen wastewater at
different hydraulic retention time (6 h, 8 h, 10 h) was studied. The experimental
results showed that both kinds of the two combined processes have good
purification efficiencies to canteen wastewater. The animal and plant oil
concentrations in the effluent of MBR and BCO process were 16.4 mg/L and 68.9 mg/L;
the removal rates of animal and plant oil can reach 99.5% and 97.8%. The
removal rates of COD were both above 90%, and the effluent COD concentration
was at 15.7 mg/L and 21.3 mg/L. There was no big difference in the removal of NH3-N
in the two kinds of combined process, and the NH3-N concentration in the
effluent was below 1 mg/L. The removal rate of TP was above 80% and the TP concentration
in the effluent was about 0.4 mg/L. The removal rate of TN was not ideal, only
about 20%. In different HRT conditions, there was no big difference in NH3-N and
TN removal rate in the two kinds of combined process, but the removal rate of TP
in high HRT condition was unstable. Therefore, the more suitable HRT of MBR
process and BCO process was determined at 6 h.