硝酸铈对污泥胞外多聚物及污泥颗粒化的影响

研究发现不同质量浓度硝酸铈对活性污泥的比耗氧速率、增长速度、脱氢酶活性及微生物相产生不同程度的影响,质量浓度为50mg／L时对改善污泥性能有较为明显的作用。以普通活性污泥为接种污泥,葡萄糖和乙酸钠为碳源,在两个SBR反应器内对比污泥颗粒化过程。通过监测EPS组分、污泥疏水性、MLSS、SVI、COD、TN和TP,发现硝酸铈可以促进污泥颗粒化过程。稳定后的含铈颗粒污泥同时具有脱氮除磷作用,COD、TN、TP去除率分别达到95％、80％和85％。

The effect of cerium nitrate on extra-cellular polymeric substances and granulation of activated sludge

Cerium nitrate affects SOUR (specific oxygen uptake rate), biomass growth velocity and biologic phase of activated sludge in various degrees. Results show that cerium nitrate (50mg／L) can greatly improve the quality of sludge. Then, the conventional activated sludge was inoculated with aerobic SBR where glucose and sodium acetate were used as the carbon sources to study the formation of aerobic granular sludge. The composition of extracellular polymeric substances(EPS) and the hydrophobicity of sludge, as well as MLSS, SVI, COD, TN and TP were observed. The results indicate that cerium nitrate could promote the formation of aerobic granular sludge. The removal rates of COD, TP and TN are 95％, 80％ and 85％, respectively.