聚氨酯固定高效优势耐冷菌处理低温生活污水

Preponderant psychrotrophs immobilized on PU foam to treat low temperature domestic wastewater

为确保寒冷地区污水生物处理系统的运行效能,以生活污水为研究对象,以聚氨酯泡沫为载体固定高活性耐冷菌,通过实验室小试,考察活性污泥法与生物接触氧化法联用的内循环复合生物反应器处理低温污水的效果及主要影响因素.结果表明,该工艺解决了由于冬季水温低出水难以达标排放的问题.系统对COD、BOD5和总磷的平均去除率分别为86.66%、90%和89.67%;系统HRT为10 h,活性污泥法处理单元与生物接触氧化法处理单元的DO分别保持在2.0～4.0 mg/L和4.0～8.0 mg/L,污泥负荷为0.25～0.30 kgCOD/(kgMLSS.d),可以使系统出水在冬季达到一级B排放标准.

To guarantee the efficiency of biotreatment of domestic wastewater in chilly season, low temperature domestic wastewater was studied in laboratory by selecting out and immobilizing efficient preponderant psychrotrophs on polyurethane foams. The effect of internal circulation compound bioreactor （ICCBR） process which is a combination of activated sludge and biological contact oxidation, on treatment of low temperature domestic wastewater was analyzed and the factors affecting ICCBR process were investigated. Results show that ICCBR process can overcome the problem that effluent is always difficult to reach the discharge standard due to the low temperature in winter. The average removal rates of ICCBR process of COD,BOD5 and TP are 86. 66%, 90% and 89. 67%, respectively. While hydraulic retention time （HRT） of the system is 10h, dissolved oxygen concentrations of activated sludge process unit and biological contact oxidation unit are kept at 2. 0 -4. 0 mg/L and 4. 0 - 8. 0 mg/L respectively ; the sludge loading is kept at 0. 25 -0. 30 kgCOD/（kgMLSS · d） ; the systemic effluent can achieve the first-degree B of pollutants discharge standard for municipal wastewater treatment plant in winter.