污泥臭氧化对MBR运行效能的影响

Influence of sludge ozonation on MBR performance efficacy

结合MBR和污泥臭氧化各自的优点,开展了化学法和生物法相结合的污泥减量技术研究,对污泥臭氧化的特点及其对MBR运行效能的影响进行了考察.实验表明,污泥细胞的溶解随着臭氧投加量的增加而改善,但当投加量大于0.16mg/mgMLVSS时,污泥混合液的性状(MLVSS、SCOD)变化趋缓.在最佳的投加量下,53.1%的MLVSS被臭氧溶解,而SCOD和TN分别升高1287,143.9mg/L.臭氧对有机物的氧化使得液相中的C/N比仅为8.6.通过3个MBR系统[污泥臭氧化的数量分别为进水流量(Q)的0、0.5%和1%]的平行运行,结果显示,臭氧化能够显著降低系统的污泥产率(0.5%Q和1%Q系统的污泥产率仅为0.17,0.12kgMLSS/kgCOD,较0Q系统分别下降了29%和50%),同时不对硝化和有机物的去除作用产生明显的影响,系统出水水质良好.

The technical study of sludge reduction of combining the chemical method with biological method was developed, with integrating the merits of MBR and sludge ozonation. The characteristics of sludge ozonation and its influence on MBR performance were investigated. The solubilization of sludge cell improved with the increase of ozone dose, but the properties of mixed sludge liquor （MLVSS, SCOD） changed slowly when the dose was above 0.16mgO3/mgMLVSS. Under the optimal dose, 53.1% of MLVSS was solubilized by ozone; while SCOD and TN raised 1287 and 143.9mg/L, respectively. The ratio of C/N in liquor phase was only 8.6 due to the oxidation of organic by ozone. Through parallel running of three MBRs systems （amounts of sludge ozonation were 0, 0.5% and 1% of influence flow rate respectively）, ozonation could reduce markedly the sludge production rate of the system （the sludge production rate of 0.5%Q and I%Q systems were only 0.17 and 0.12kgMLSS/kgCOD, with reduction of 29% and 50% respectively in comparison with the OQ system）; meanwhile, no obvious influence was observed on nitration and organic removal, the outflow water quality of the system was good.