MBBR-SA工艺处理模拟大豆深加工废水厌氧出水及污泥减量化

针对大豆深加工高浓度有机废水厌氧出水的特点,采用移动床生物膜反应器-沉淀池-厌氧池(MBBR-SA)工艺进行处理,重点考察了其COD去除、脱氮以及污泥减量化的性能。处理前厌氧出水水质参数为COD 1 350～1 851 mg/L、TN 45～73 mg/L和TP 35～55 mg/L。结果表明,经过70 d的运行,在最佳水力停留时间(HRT)1.68 d与最佳回流比0.75条件下,出水平均COD、TN和NH4+-N浓度分别为91.5、12.4和11.4 mg/L,分别达到了《城镇污水处理厂污染物排放标准》二级标准、二级标准和一级B标准,其平均去除率分别为96.0%、87.4%和88.3%;该工艺未排放剩余污泥,其表观污泥产率为0.13,比MBBR降低了43.5%,具有明显的污泥减量化特性。

Treatment of anaerobic effluent from synthetic soybean further processing wastewater and sludge reduction by MBBR-SA process

According to properties of anaerobic effluent from the soybean further processing wastewater, MBBR-Settling-Anaerobic (MBBR-SA) system was designed and operated with the synthetic soybean wastewater which with COD of 1 350~1 851 mg/L, TN of 45~73 mg/L and TP of 35~55 mg/L, the effects of COD removal and nitrogen removal were investigated. During 70 days operation, a good performance was shown in the MBBR-SA system when the optimal hydraulic retention time (HRT) and reflux ratio were 1.68 d and 0.75, respectively. The treated effluent levels of COD, TN, NH₄⁺-N remained below 91.5 mg/L, 12.4 mg/L, 11.4 mg/L, respectively and met Class II standard, Class II standard and Class I B Standard of Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant, respectively. The average removal efficiencies of COD, TN and NH₄⁺-N in effluent were 96.0%, 87.4% and 88.3%, respectively under the optimal operation conditions. The residual sludge was not discharged and the observed sludge yield was 0.13,which reduced by 43.5% than MBBR. Remarkable on-site sludge reduction was realized by MBBR-SA system.