加碱预处理对致病微生物去除效果及动力学研究

Inactivation of pathogenic microorganisms by alkaline pretreatment and kinetic analysis

以不同总固体含量（TS）（8％、10％、12％）的粪便污泥为研究对象,采用加碱技术对粪便污泥进行处理,探讨不同pH值（10、12）的碱预处理对4种指示性致病微生物（粪大肠杆菌、沙门氏菌、粪链球菌、蛔虫卵）的灭活效果并对致病微生物的去除过程进行动力学分析,同时通过分析预处理过程中粪便污泥pH值、SCOD和溶解性蛋白质的含量来表征碱预处理对粪便污泥水解的影响.结果表明,加碱预处理初始pH值分别为10、12时,预处理3d后各TS粪便污泥中4种致病微生物均被完全去除,且Weibull动力学模型对微生物去除过程的描述优于一级动力学模型;pH值为10时,粪便污泥SCOD增加了1.84～1.89倍,溶解性蛋白质增加了8.25～9.39倍;pH12时,粪便污泥SCOD值增加了1.90～1.97倍,溶解性蛋白质增加了8.62～9.89倍.

The alkaline pretreatment effect for different TS of faecal sludge （8%, 10%, 12%） to inactive the pathogens （fecal coliforms, Salmonella spp., fecal streptococcus, and helminth eggs） and disintegrate the faecal sludge （SCOD and soluble protein） was studied. The resulting microbial inactivation curves were either described by the Weibull or first-order model and goodness fit of two models was investigated. The results showed that when the pH was 10or 12 at the beginning, four kinds of pathogens were completely removed after three days, and the Weibull model exhibited data of pathogen inactivation more efficiently than the first-order model. When the pH was 10, the SCOD of faecal sludge increased 1.84～1.89times, soluble protein increased 8.25～9.39times. When the pH was 12, the SCOD of faecal sludge increased 1.90～1.97times, soluble protein increased 8.62～9.89times.