应用解蛋白菌生物预水解剩余污泥

Biological Pre-treatment of Surplus Sludge Using the Protease-secreting Bacteria

本文比较了解蛋白菌——地衣芽孢杆菌在不同接种比(0.17%、0.66%、1.16%和1.65%,以TS比计)条件下,生物菌剂预水解对剩余污泥液化效果和脱水性能的影响规律.结果表明,以地衣芽孢杆菌为接种物进行生物预处理,可以促进污泥胞内物质的溶出,同时促进污泥中蛋白质的溶出和降解,但污泥的脱水性能会有所劣化.发现地衣芽孢杆菌的接种比为1.16%时,溶解性有机物的累积溶出量达到最大值,而继续提高接种比并不会增加溶解性有机物的累积溶出量;同时,在该接种比下,经过129 h的生物预处理,蛋白质与挥发性固体的比值达到最低,为初始值的72%,表明蛋白质的降解量达到最大值.但经过129 h生物预处理,污泥的模化CST值上升为初始值的2倍左右,经过生物预处理后污泥的脱水性能劣化.

The performances of biological pre-treatment were compared at different inoculation ratios of Bacillus licheniformis（ 0. 17%,0. 66%,1. 16% and 1. 65%,TS / TS）,in order to evaluate the influence on sludge liquefaction and its dewaterability. The analysis showed that biological pre-treatment by inoculating Bacillus licheniformis accelerated the dissolution of intracellular materials and increased the degradation of protein,but the sludge dewaterability deteriorated. When the inoculation ratio of Bacillus licheniformis was1. 16%,the cumulative effect of dissolved organic carbon reached its maximum. Keeping increasing the inoculation ratio would not result in any improvement. At an inoculation ratio of 1. 16%,the quantity of protein per volatile solid reached the minimum,which was 72% of the initial value,after 129 hours of digestion,which reflected the maximal degradation rate of protein. But at same time,the value of CST of sludge doubled,which indicated the deterioration of sludge dewaterability.