基于小球藻的BCO-SBBR系统处理猪场沼液的研究

Treatment of Piggery Biogas Slurry by BCO-SBBR Based on Chlorella

养猪场沼液含有高浓度的氮、磷以及有机物,且C/N值低、碳氮比失衡,处理难度很大。采用生物接触氧化/序批式生物膜反应器系统(简称BCO-SBBR)以猪场沼液培养小球藻,探讨其对猪场沼液的处理效果。结果表明:进水COD、NH+4-N、TN、TP浓度分别为1 926、878.24、895.06、91.05 mg/L,相应的出水浓度分别为1 194、239、241.27、33.67 mg/L,去除率分别达到38%、72.8%、73%、63%。处理后出水的C/N值提高到5,更适宜微生物生长,有利于改善后续生物处理设施的去除效果。

It is difficult to treat piggery biogas slurry due to its high concentrations of nitrogen, phosphorus and organic matter, low C/N ratio and imbalance of carbon/nitrogen ratio. The biological contact oxidation/sequencing batch biofilm reactor （BCO-SBBR） system was used, ChloreUa was cultured in piggery biogas slurry, and the treatment effect of piggery biogas slurry was investigated. The results showed that when the influent concentrations of COD, NH4^＋ - N, TN and TP were 1 926 mg/L, 878.24 mg/L, 895.06 mg/L and 91.05 mg/L, respectively, the corresponding effluent concentrations were 1 194 mg/L, 239 mg/L, 241.27 mg/L and 33.67 mg/L, respectively, and the removal rates were 38%, 72.8%, 73% and 63%, respectively. As a result, the C/N ratio of the treated wastewater was increased to 5, which was more suitable for microbial growth and advantageous to improve the efficiency of the subsequent biological treatment facilities.