高效污泥降解菌种的筛选及在污泥堆肥中的效果

从采集的高温样品中分离筛选出4株污泥堆肥菌株,经鉴定,这4株菌均系芽孢杆菌属(Bacillus)。将这4株菌等比例混合制成微生物菌剂,按0、3%、5%和10%的菌剂添加量接种至堆肥体系中,筛选合适的堆肥接种量,并探究其在污泥堆肥中的应用效果。结果表明:添加微生物菌剂的处理组在各项堆肥指标上明显优于空白组,处理组堆体的升温速度、物料水分去除率和最高温度值均高于空白组,堆肥结束时,处理组均完全腐熟,而空白组未达腐熟标准。各处理组中,以3%菌剂添加量的堆肥效果最好,各项指标最佳:堆体最高温度达63 ℃,堆体高于55 ℃的高温可持续4 d,堆肥后种子发芽指数为134.1%。说明筛选配制的微生物菌剂在污泥堆肥中具有一定的应用潜力。

Screening of high efficient sludge degrading strains and their potential in sludge composting

Four sludge composting strains were isolated from high temperature samples, and were classified into the genus of Bacillus. These strains were mixed in the same proportion as microbial inoculum, and were added to the composting system to study the suitable microbial inoculum concentration and application potentials in sludge composting. The results showed that the temperature rising rate, water content decreasing rate and the maximum temperature of those treatments with inoculation were higher than the control (treatment without inoculation). The inoculated treatments completely maturated, while the control did not reach maturity standard. When the inoculating amount was 3%, the effect was the most obvious, as the maximum temperature was 63 ℃, the high temperature above 55 ℃ lasted for 4 days, and the seed germination index was 134.1% after composting. These results suggested that the proposed microbial inoculum had potential in sludge composting.