Cu^(2+)对好氧颗粒污泥理化特性的影响分析

Analysis of influence of Cu^(2+) on physicochemical characteristics of aerobic granular sludge

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+(0mg/L、1mg/L、3mg/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0mg/L上升至10mg/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1mg/L和3mg/L的Cu2+对COD和NH+4-N的去除率影响较小,而质量浓度为5mg/L和10mg/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。

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.