Effects of pH on the production of short-chain fatty acids from waste activated sludge enhanced by potassium peroxymonosulfate

doi:10.16085/j.issn.1000-6613.2019-1982

Abstract

Abstract:

In order to improve the production of short-chain fatty acids (SCFAs) from waste activated sludge (WAS), the effects of different initial pH (pH=9—12)on SCFAs production were studied with the dosage of potassium peroxymonosulfate (PMS) of 0.08 g/g TSS at (30±1)℃ by measuring the concentration of SCFAs and the reduction rate of organic matter. The results show that when the initial pH is 9—11, the production of SCFAs increases with the increase of the initial pH. The concentration of SCFAs is slightly lower at the initial pH of 12 than that at the initial pH of 11. The organic matter reduction rate decreases in the order of PMS+pH11, PMS+pH12, PMS+pH10, PMS+pH9 in different fermentation systems. The yield of SCFAs reaches the maximum value (2225.02mg COD/L) at the end of the fifth day under the conditions of pH=11 and PMS dosage of 0.08g/g TSS, which is 4.76, 3.23 and 1.13 times of that in the blank, PMS and pH11, respectively, and the reduction rate of organic matter reaches 38.98%. Three-dimensional fluorescence spectroscopy shows that PMS+pH11 conditions promote the release of soluble microorganisms and humic acids in sludge, and improve the degradation of tyrosine. Mechanism studies reveal that solubilization, hydrolysis and acidification are promoted and methanogen is inhibited during PMS+pH11 conditions, which are conducive to the accumulation of SCFAs.

Key words: waste activated sludge, anaerobic fermentation, pH, potassium peroxymonosulfate, acid production

摘要：

为提高污泥厌氧发酵的短链脂肪酸（SCFAs）产量，在温度(30±1)℃，过硫酸氢钾复合盐（PMS）投加量为0.08g/g TSS的条件下，通过对SCFAs浓度及有机质减少率的测定，研究不同初始pH（pH=9～12）对PMS强化剩余污泥厌氧发酵产酸过程的影响。结果表明：在初始pH 9～11时，SCFAs的浓度随初始pH增加均有所提高。初始pH 12时，SCFAs 浓度稍低于初始pH 11。有机质减少率按从大到小排列为PMS+pH 11>PMS+pH 12>PMS+pH 10>PMS+pH 9。在pH=11，PMS投加量为0.08g/g TSS的条件下，发酵5天时SCFAs产量达到最高（2225.02mg COD/L），约为空白、只投PMS和只调节pH 11的4.76倍、3.23倍和1.13倍，有机质的减少率为38.98%。三维荧光光谱分析表明PMS+pH 11能有效促进污泥中溶解性微生物和腐殖酸的溶出，提高酪氨酸的降解。机理研究表明PMS+pH11促进了溶解、水解和酸化过程，同时抑制产甲烷过程，有利于SCFAs的积累。

关键词: 剩余污泥, 厌氧发酵, 氢离子浓度指数, 过硫酸氢钾复合盐, 产酸

CLC Number:

X703

Yuqing ZHANG, Xiulan SONG, Pei BI. Effects of pH on the production of short-chain fatty acids from waste activated sludge enhanced by potassium peroxymonosulfate[J]. Chemical Industry and Engineering Progress, 2020, 39(9): 3786-3793.

张雨青, 宋秀兰, 毕培. pH对过硫酸氢钾复合盐强化剩余污泥产酸的影响[J]. 化工进展, 2020, 39(9): 3786-3793.

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