矿化垃圾对剩余污泥厌氧水解、酸化的影响

通过向剩余污泥发酵系统中加入不同剂量的矿化垃圾的方法,探究了矿化垃圾对剩余污泥厌氧水解、酸化过程的影响.结果表明,添加1/3g/g TSS(总悬浮固体)剂量以内的矿化垃圾能显著提高WAS的水解、酸化过程,且矿化垃圾的最佳投加量为1/3g/g TSS,在此条件下,试验组SCOD/TCOD以及最大产酸量(183.45mg COD/g VSS,发酵时间为6d)均高于空白组(79.45mg COD/g VSS,发酵时间为10d).机理研究表明,矿化垃圾能够促进污泥的溶解、蛋白质和多糖的水解以及氨基酸和葡萄糖的酸化.在投加矿化垃圾的反应体系中与水解、酸化有关酶的活性也均高于空白试验组,进一步证实了矿化垃圾能够强化污泥厌氧发酵的水解酸化反应.

Effect of aged refuse on hydrolysis-acidification of waste activated sludge anaerobic fermentation

This paper investigated the effects of aged refuse on the hydrolysis and acidification processes of waste activated sludge (WAS) anaerobic fermentation by adding different dosages of aged refuse. Experimental results showed that significant improvements of hydrolysis and acidification of WAS anaerobic fermentation were achieved within the dosage of 1/3g/g TSS (total suspended solid) and the optimum dosage of aged refuse was 1/3g/g TSS. The ratio of SCOD/TCOD and the short chain fatty acids (SCFAs) production (183.45mg COD/g VSS, 6d) in the presence of aged refuse were largely higher than those in the blank (79.45mg COD/g VSS, 10d). Mechanism study showed that the appropriate inoculation quantity of aged refuse could enhance sludge solubilization, hydrolysis of protein and polysaccharide, acidification of glucose and amino acid. In addition, the key enzymes relevant to hydrolysis and acidification in the presence of aged refuse were much higher than those in blank, which further confirmed that aged refuse could improve hydrolysis and acidification of WAS anaerobic fermentation.