单过硫酸氢钾复合盐对剩余污泥厌氧发酵的影响

Effect of potassium peroxymonosulfate on waste activated sludge anaerobic fermentation

为了研究单过硫酸氢钾复合盐（PMS）对剩余污泥厌氧发酵的影响,将不同剂量的PMS投加至剩余污泥厌氧发酵系统中,分析污泥溶液化率、污泥分解率、可挥发性脂肪酸（SCFAs）、蛋白质和多糖、水解酶、发酵污泥毛细吸水时间（CST）及可挥发性悬浮固体浓度（MVLSS）等指标.研究发现,在污泥中投入适量的PMS能够有效地促进污泥水解酸化,提高污泥减量率.结果表明,当PMS为0.04~0.08 mg/mg时污泥发酵性能最佳,水解酸化性能相近.当PMS大于0.08mg/mg时,污泥发酵性能下降,且该条件下药剂消耗成本较高,不利于发酵系统运行.研究同时发现,PMS能够显著提高SCFAs中乙酸的比例,乙酸比例最高可达到75.55%,同时降低丙酸比例,丙酸比例最低可达到0.92%.

In order to investigate the effect of potassium peroxymonosulfate（ PMS） on the waste activated sludge（ WAS） anaerobic fermentation,the PMS of different dose was added into the fermentation systems. Different indicators,such as the WAS solubilization rate,disintegration degree rate,short chain fatty acids（ SCFAs）,protein,polysaccharide,hydrolase,capillary suction time（ CST）of WAS and volatile suspended solid（ MLVSS） concentration were analyzed in the anaerobic fermentation process. It is found that the appropriate PMS effectively enhances the WAS hydrolysis acidification function and sludge reduction. The results showthat when the PMS is 0. 04 to 0. 08 mg / mg,the fermentation performance of WAS is the best and they have a similar hydrolytic acidification performance. However,the fermentation performance of WAS is reduced and the reagent cost is increased when the PMS is higher than 0. 08 mg / mg. It is not beneficial to the fermentation system operation. At the same time,it is found that the PMS can significantly increase the proportion of acetic acid to the maximum of 75. 55%,and decline the proportion of propionic acid to the minimum of 0. 92% in SCFAs.