高铁酸钾对剩余污泥厌氧发酵性能的影响

Effect of potassium ferrate on anaerobic fermentation performance of waste activated sludge

为了研究高铁酸钾(PF)对剩余污泥厌氧发酵性能的影响,将不同剂量的PF投加至剩余污泥厌氧发酵系统,分析污泥溶液化率、污泥分解率、短链脂肪酸(SCFAs)、蛋白质、多糖、生物酶等指标,考察PF对污泥厌氧发酵的作用机理。结果表明,PF能够有效提高污泥水解酸化性能,且污泥水解酸化性能随着PF投加量(0~160 mg/mg)的增加而增强,PF投加量为160 mg/mg的发酵系统中,发酵末期蛋白质、多糖、SCFAs分别为552.17、355.39、914.30 mg/L,分别是PF投加量0 mg/mg发酵系统的2.7、4.6、8.3倍。适当浓度的PF能够提高蛋白酶、α-葡萄糖苷酶、碱性磷酸酶和脱氢酶活性,但是PF抑制酸性磷酸酶活性。同时,PF能够明显提高SCFAs中乙酸的比例,乙酸质量分数最高可达到57.81%。可见,PF不仅能提高污泥厌氧发酵性能,同时能够优化产酸类型。

In order to investigate the effect of potassium ferrate(PF) on anaerobic fermentation performance of waste activated sludge(WAS),the PF of different dose was added into the fermentation systems. Different indicators including the WAS solubilization rate and disintegration degree rate, short chain fatty acids(SCFAs),protein, polysaccharide, hydrolase activity were analyzed in the anaerobic fermentation process to study the mechanism of PF for the WAS anaerobic fermentation. Results showed that the PF effectively enhanced the WAS hydrolysis acidification function, which increased with PF dose(0-160 mg/mg). The production of protein, polysaccharide and SCFAs appeared in the 160 mg/mg fermentation system were 552.17,355.39 and 914.30 mg/L in final fermentation, respectively, which were 2.7,4.6 and 8.3 times of the 0 mg/mg fermentation system. The study also found that appropriate concentration of PF could enhance the activity of protease, α-glucosidase, alkaline phosphatase and dehydrogenase, but declined the activity of acid phosphatase. At the same time, PF could significantly increase the proportion of acetic acid with the maximum mass fraction being 57.81%. Therefore, PF not only could enhance the sludge fermentation performance, but also optimize the type of acid produced.