生物絮凝吸附/生物接触氧化处理城市污水研究

Experimental Study of Combined Treatment of Municipal Wastewater by Bio-flocculation and Adsorption/Bio-contact Oxidation

通过试验研究了生物絮凝吸附强化一级处理/生物接触氧化法组合工艺处理城市污水的效果,并就污泥负荷对处理效果的影响进行了分析。试验结果表明:在Q=1.5 m3/d,再生池DO=2 mg/L,絮凝吸附池的搅拌强度60 r/min,DO=0.2 mg/L,污泥浓度MLSS=1000 mg/L,污泥回流比为60%,生物接触氧化池的气水比为5:1,系统污泥龄在15 d时,组合工艺对污染物的总体去除效果良好,且稳定可靠,可以使除磷以外的所有指标达到《城镇污水处理厂污染物排放标准》(GB18918-2002)中的一级B标准,其强化一级处理段COD和SS的平均去除率可高达72%和76%,并且对氮也有明显的去除效果,大大减轻了后续处理的负荷。

This experiment studied the effect of bio-flocculation and adsorption intensified primary treatment / bio-contact oxidation for municipal wastewater treatment. The influence of sludge load on the treatment effect also was analyzed. The results show that the removal effect of the combined technique was stable and reliable for the wastewater as a whole under the following conditions： the flux of waste-1.5 m^3/d; recycling basin dissolved oxygen- 2 mg/L. the flocculation and adsorption basin mix intensity-60 revolution per minute with dissolved oxygen-0.2 mg/L; sludge concentration 1 000 mg/L; circumfluence ratio 60% air-water ratio-5： 1; and sludge age-15 days. Except for phosphorus levels, all indices reached first class level B according to GB18918-2002, the norm for effluent concentration discharged from urban wastewater treatment plants. During its intensified primary treatment, the average removal ratio of COD and SS reached 72 and 76 percent, respectively. The remarkable removal effect of nitrogen could reduce greatly the follow-up treatment load.