Cu2+对好氧颗粒污泥理化特性的影响分析

摘要

In this study, aerobic granular sludge was cultivated in a sequencing batch reactor ( SBR) with glucose and sodium acetate as the carbon sources. The shock-loading effects of varying Cu2+concentrations (0, 1, 3, 5 and 10 mg/L) on the physicochemical characteristics of the aerobic granular sludge were studied. The results show that the physicochemical characteristics of the aerobic granular sludge were affected as the concentration of Cu2+increased from 0 to 10 mg/L. Cu2+ with concentrations of 1 and 3 mg/L had a slight effect on the removal efficiencies of COD and NH+4-N, while Cu2+ with concentrations of 5 and 10 mg/L had a significant effect on the removal efficiencies of COD and NH+4-N. As the concentration of Cu2+ increased, filamentous bacteria in the aerobic granular sludge increased gradually, the concentration of sludge decreased continuously, and the settling property deteriorated rapidly. In addition, a decrease in the density degree, a loosening structure, and polarization of particle size of the aerobic granular sludge were found in the SBR, and the granular sludge disintegrated when the Cu2+concentration was 10 mg/L.%以普通活性污泥为接种污泥,葡萄糖和乙酸钠为碳源,在SBR反应器中培养好氧颗粒污泥,考察不同质量浓度Cu2+(0 mg/L、1 mg/L、3 mg/L、5 mg/L和10 mg/L)冲击作用对好氧颗粒污泥理化特性的影响。结果表明,随着Cu2+质量浓度从0 mg/L上升至10 mg/L,好氧颗粒污泥的理化特性均受到不同程度的影响。质量浓度为1 mg/L和3 mg/L的Cu2+对COD和NH+4-N的去除率影响较小,而质量浓度为5 mg/L和10 mg/L的Cu2+对COD和NH+4-N的去除率影响较大。随着Cu2+质量浓度的增加,好氧颗粒污泥的丝状菌逐渐增多,污泥浓度不断下降,沉降性能急剧恶化；密实度降低,结构越来越松散,粒径出现两极分化的现象,而且在质量浓度为10 mg/L的Cu2+作用下颗粒污泥解体。