添加牛粪对蚯蚓处理污泥的影响

Influence of cow dung addition on sewage sludge treatment by earthworms

采用4个相同的塑料装置,将等量的污泥、EM菌、蚯蚓及不同量的牛粪装入其中并混匀后,通过60 d的培养实验,借助对污泥含水率、pH、TP、TOC和TN的监测及蚯蚓生存状况的考察,探究添加牛粪对蚯蚓处理污泥的影响。结果表明:添加牛粪可以抑制污泥含水率的增加,但不同牛粪添加量对污泥含水率的影响无一定规律性;与初始TP相比,1#~4#中污泥TP增长率分别为81%、97%、56%和102%,除3#外,污泥TP增幅随牛粪添加量的增加而增大;因生物作用,1#~4#污泥TOC均呈下降趋势,1#~4#中污泥TOC分别下降了13.6%、22.4%、21.7%和16.1%;1#~4#污泥TN变化与牛粪添加量的变化之间无明显规律。污泥中添加牛粪,对蚯蚓健康有益。

In order to investigate the effect of cow dung on vermicomposting,4 identical plastic equipments were applied to distinguish the sewage sludge containing different ratios of cow dung.At the same time,equal EM and earthworms were added in each of equipments.The data of moisture,pH,TP,TOC,TN in sludge and reproduction of earthworms were analysed during 60 days.Based on the data,the influences of earthworms on sewage sludge were investigated.The results indicated that adding cow dung could limit the moisture content increasing.But moisture content didn't change in line with the quantities of cow dung.Compared with initial TP of 1#~ 4#,the final TP of 1#~ 4#increased 81%,97%,56% and 102%,respectively.The growth rates of TP increased with the quantities of cow dung except 3#.Due to the biodegradation in sludge,the percentage of TOC decreased in 1#~ 4#,and the decreasing rates of TOC were 13.6%,22.4%,21.7% and 16.1%,respectively.There was no obvious regularity between TN and the ratios of cow dung in 1#~ 4#.Adding cow dung in sludge is benefit to earthworms' health.