超声强化好氧堆肥结合蚯蚓处理污泥过程中有机碳的动力学研究

Study on the Kinetics of Organic Carbon in Sludge by Ultrasonic Enhanced Aerobic Composting and Vermin Composting

有机碳的变化能反映好氧堆肥及蚯蚓处理这两个过程中污泥有机物的分解情况。将城镇污水处理厂剩余污泥通过超声强化10 min,研究4种不同的污泥混合比例,在蚯蚓放养密度为80 g/kg的条件下,好氧堆肥结合蚯蚓处理污泥过程中有机碳的变化规律。结果显示:经过超声强化的污泥,有机碳的分解率高于未经超声强化的污泥;有机碳随着反应时间的增加而逐步下降。好氧堆肥阶段的有机碳分解率高于蚯蚓处理阶段。经超声强化的实验组别有机碳平均分解率为43.36%,其平均降解速率常数k值为0.007 3 d-1。从有机碳的变化趋势来看,使用超声强化好氧堆肥结合蚯蚓处理剩余污泥系统,宜选择的工艺参数是,超声处理时间10min,蚯蚓放养密度是80 g/kg,混合超声强化污泥量60%。

The changes of organic carbon can reflect the decomposition of organic matters in sludge during the aerobic composting and the vermicomposting processing.The changing rule of the organic carbon was studied under the condition that the excess sludge was enhanced by ultrasonic disintegration for10minutes,there were four different sludge mixture ratio,and the stocking density of earthworm was80g/kg.The results showed that,the organic carbon decomposition rate of the sludge enhanced by ultrasonic disintegration was higher than the one without ultrasonic disintegration and the organic carbon decreased by degrees with the increase of reaction time.The organic carbon decomposition rate during the aerobic composting was higher than that in the vermin composting processing.The organic carbon decomposition rate of the sludge enhanced by ultrasonic disintegration was of43.36%on average and the average value of degradation rate constant k was0.0073d-1.From the point of the change trend of organic carbon,the parameters should be chosen as follows:the time of ultrasonic treatment is10minutes,the stocking density of earthworm is about80g/kg,and the ratio of sludge enhanced by ultrasonic disintegration is about60%.