改良A^2/O-MBBR装置处理城镇河道污水研究

Modified A^2/O-MBBR for Treatment of Urban Riverway Sewage

分别采用2种不同填料的改良A2/O-MBBR中试装置处理深圳市布吉河道污水,考察了该工艺的启动和雨季运行特征。经过一个月的启动运行,2组系统K3和XD填料上附着的生物量分别为14.76和6.18 mg,工艺挂膜成功。雨季的进水SS为14～3 492 mg/L,平均为232mg/L,大量的泥沙进入中试装置导致污泥的MLVSS/MLSS值从0.40降至0.19,SVI从63 mL/g降至23 mL/g。通过减小污泥排放量提高MLSS至4 000～5 000 mg/L,当进水COD为42.1～215.0mg/L时,2组系统出水COD分别为2.7～80.9 mg/L和4.7～87.6 mg/L,平均去除率分别为81.8%和79.1%;当进水氨氮和总氮分别为1.58～20.88 mg/L和5.4～26.2 mg/L时,对氨氮的去除率在98.0%以上,对总氮的去除率均为23.7%。通过投加60 mg/L的甲醇作为外加碳源,可使出水总氮稳定在15 mg/L以下,达到一级A标准。当进水总磷为0.80～6.12 mg/L时,2组系统的出水值分别为0.24～0.92 mg/L和0.26～0.92 mg/L,平均去除率分别为63.6%和67.2%。

Two modified pilot-scale A2/O-MBBRs with different fillers were used for treatment of Buji riverway sewage in Shenzhen City. The start-up of the pilot-scale A2/O-MBBRs and the operation characteristics in rainy season were investigated. The reactors started up successfully after one month, and the biomasses on the K3 and XD fillers were 14.76 mg and 6.18 mg respectively. During the rainy season, the influent SS was 14 to 3 492 mg/L, and the average SS was 232 mg/L. The MLVSS/MLSS ratio decreased from 0.40 to 0.19, and the SVI decreased from 63 mL/g to 23 mL/g due to a lot of silt going into the reactors. The MLSS concentration increased to 4 000 - 5 000 mg/L by reducing sludge dis- charge. When the influent COD was 42.1 to 215.0 mg/L, the effluent COD of the two systems were 2.7 to 80.9 mg/L and 4.7 to 87, 6 mg/L respectively. were 81.8% and 79.1%. When the influent NH4＋ The average COD removal rates of the two systems - N and TN were 1.58 to 20.88 mg/L and 5.4 to 26.2 mg/L respectively, the NH4＋ - N removal rate was above 98.0%, and the TN removal rate was 23.7%. The effluent TN of less than 15 mg/L, which met the first level A criteria, could be achieved by adding 60 mg/L methanol as an external carbon source. When the influent TP was 0.80 to 6.12 mg/L, the effluent TP of two systems were 0.24 to 0.92 mg,/L moval rates were 63.6% and 67.2% respectively. and 0.26 to 0. 92 rag/L, and the average TP re moval rates were 63.6% and 67.2% respectively.