污泥-石灰高效混合耦合绝热强化技术对污泥微生物活性的抑制机制  

Sludge microbe activity control mechanism of sludge-lime efficient mixing incorporated heat insulation technology

作　　者：蒋建国[1] 宫常修[1] 杜伟[1] 殷闽[1] 李春萍[2] 

机构地区：[1]清华大学环境学院,固体废物处理与环境安全教育部重点实验室,北京100084 [2]北京建筑材料科学研究总院,北京100041

出　　处：《清华大学学报（自然科学版）》2013年第5期642-646,共5页Journal of Tsinghua University(Science and Technology)

基　　金：国家水体污染控制与治理科技重大专项资助项目(2012ZX07301-001)

摘　　要：利用污泥-石灰高效混合设备联合绝热污泥仓制备石灰质量百分数为5%、10%、15%的稳定化污泥,在实验室条件下对细菌总数、大肠菌值进行测定,并对pH值、泥体温度和养护时间等影响因素进行了分析。结果表明:添加石灰后污泥的pH值能够达到12及以上,泥温升高到40～55℃,采用绝热污泥仓对污泥养护处理2h后,泥体温度达到47.6～65.4℃;污泥中添加石灰,可培养细菌总量由原泥平均菌落数2.94×108 CFU/g降低到3.75×104 CFU/g,大肠菌值(MPN值)则由原泥的每克1.19×10-8增加到每克0.137以上;灭菌效果随着石灰投加质量百分数的增加而加强,与较高的石灰投加质量百分数保证较高的pH、获得更高的泥体温度及渗透压有关;保持较高温度情况下对石灰稳定化污泥进行养护处理对石灰的灭菌效果具有促进作用。该技术可以增加污泥的pH、温度,显著降低污泥细菌总量和大肠杆菌数量,相对于单独污泥石灰处理能更好的实现污泥无害化、卫生化的目的。The factors affecting bacteria production,colititre in lime stabilized sludge were investigated for sludge made in thermally insulator sludge-lime mixers with lime mass fraction of 5%,10% and 15%in laboratory tests.The results show that the pH of the lime stabilized sludge can exceed 12at temperatures of 40～55℃.The sludge temperatures reached 47.6～65.4℃after 2hincubation in the insulated sludge container.The results also showed that the cultivable amount of bacteria decreased from 2.94×10 8 CFU.g-1（in the original sludge） to an average of 3.75 × 10 4 CFU / g-1 for application rates of 5%,10% and 15% as the colititre MPN increased from 1.19×10-8 g-1 to 0.137g-1 or more.The sterilizing effect could be enhanced by increasing the lime application rate which increases the pH,temperature and osmotic pressure;thus,the high temperatures improve the sterilization of the lime stabilized sludge.Then,the results show that this method increases the sludge pH and temperature while greatly reduce the amount of cultivable bacteria and colititre to better sterilize the lime compared to a single lime treatment.

关 键 词：石灰稳定化 细菌 大肠菌值 微生物活性 市政污泥 

分 类 号：X705[环境科学与工程—环境工程]