微生物强化MBR工艺剩余污泥的好氧消化过程  

Improving efficiency of MBR sludge using microorganisms in aerobic digestion process

作　　者：李再然[1] 宋英豪[1] 贾立敏[1] 王焕升[1] 刘茹[2] 熊娅[3] 苏本生[1] 

机构地区：[1]北京化工大学高新技术研究院,北京100029 [2]环境保护部南京环境科学研究所,南京210042 [3]中国地质大学环境科学与工程系,北京100083

出　　处：《环境工程学报》2015年第4期1989-1994,共6页Chinese Journal of Environmental Engineering

基　　金：国家"863"高技术研究发展计划项目(2014BAC04B01)

摘　　要：为了考察原位污泥减量技术产生的长污泥龄污泥好氧消化可能性,以某污水处理厂MBR工艺产生的剩余污泥为研究对象(污泥龄为60 d),将实验筛选得到的强化效果最佳的3种菌种(分别为B4、H4和N2)分别投加到MBR剩余污泥好氧消化反应器中。经过58 d的好氧消化后,投加B4、H4和N2的3个反应器MLSS消解率分别比污泥对照提高了13.2%、11.7%和6.2%,其中投加B4菌种MLSS消化效率提高最多。MLVSS消解率分别比污泥对照提高18.8%、20.0%和11.0%。研究表明原位污泥减量技术产生的长污泥龄污泥具有污泥好氧消化的可能性,同时筛选出来的3种菌种在消化过程中有明显的强化效果。随着消化反应的进行到52 d,反应器中出现大量的硝酸盐氮和总磷的积累。观察反应过程中氨氮、硝酸盐氮、p H和总磷的变化,大量的硝酸盐存在时诱导以硝酸盐为电子受体的反硝化除磷的进行。在消化过程中,磷溶出情况取决于污泥的水解程度,投加菌种加速了总磷溶出和提高了污泥的水解程度。同时投加菌种强化好氧消化显著降低污泥的SVI,投加菌种在强化好氧消化过程中能更多地消耗污泥中有机物,进而提高消化效率。In order to investigate the aerobic digestion ability of the long-age sludge,which was produced in the in-situ minimization process,MBR excess sludge aged sixty days was selected as the subject. There were three kinds of microorganisms with the maximum digestion which were named B4,H4 and N2,respectively. They were employed in the aerobic digestion. After 58 days,the mixed liquid suspended solids( MLSS) digestion efficiency of the three aerobic digestion reactors increased by 13. 2%,11. 7% and 6. 2% than the sludge control,respectively when B4,H4 and N2 were added respectively into the reactors. Dosing the bacteria B4 had the best digestion of MLSS. And the mixed liquid volatile suspended solids( MLVSS) digestion efficiency increased by 18. 8%,20. 0%,and 11. 0%,respectively. The results indicated that the aerobic digestion ability of the long-age sludge produced by the in-situ minimization process was existed. A significant positive effect of microorganisms in the digestion process can be found. A lot of nitrate and total phosphorus was accumulating at the 52 th day in the aerobic digestion reactors. The analysis of NH+4-N,NO-3-N and p H indicated that the large number of nitrate induced the process of denitrifying phosphorus removal with the nitrate as the electron acceptor. The hydrolysis degree of sludge influenced the dissolution of total phosphorus. Dosing bacterial would accelerate dissolution of total phosphrous and inhance the hydrolysis of sludge. Moreover,the screened microorganisms can reduce the sludge volume index( SVI) of the sludge during the aerobic digestion,the bacteria consumed more organic matter to enhance efficiency of digestion.

关 键 词：微生物强化 好氧消化 污泥减量 污泥沉降性能 MBR剩余污泥 

分 类 号：X703.1[环境科学与工程—环境工程]