Abstract: In order to improve the acid producing capacity of sludge,the influences of oxidant K₂S₂O₈ on the process of excess sludge anaerobic fermentation have been studied,and the influences of K₂S₂O₈ on SCOD,short chain fatty acids(SCFAs),soluble protein and polysaccharide,as well as specific resistance of sludge and volatile solid concentration(VSS) investigated. The experimental results show that appropriate K₂S₂O₈ concentration is beneficial to the hydrolysis of sludge,optimization of acid producing types and the improvement of production capacity of SCFAs. When the dosage of K₂S₂O₈ is 0.12 g/g,higher acid producing capacity can be obtained. The sludge acid producing capacity reaches 209.21 mgSCFAs/gVSS. In addition,adding moderate amount of K₂S₂O₈ can improve organic matter reduction rate and sludge dewatering capability. When the dosage of K₂S₂O₈ is 0.12 g/g,the organic matter reduction rate of sludge can reach 34.75%,and the sludge specific resistance is decreased by 38.5%,compared with the control group.

Key words: sludge, anaerobic fermentation, short chain fatty acids, potassium persulfate

摘要： 为了提高污泥产酸量，研究了氧化剂过硫酸钾（K₂S₂O₈）对剩余污泥厌氧发酵过程的影响，考察了K₂S₂O₈对厌氧发酵过程中SCOD、短链脂肪酸（SCFAs）、溶解性蛋白质和多糖及污泥比阻和挥发性固体的影响。结果表明：适宜的K₂S₂O₈浓度有利于污泥的水解、产酸类型的优化以及SCFAs产量的提高。当K₂S₂O₈投加量为0.12g/g时，可以获得较高的产酸量，污泥产酸量达209.21 mgSCFAs/gVSS。同时，投加适量的K₂S₂O₈能提高有机质减少率，改善污泥脱水性能。当K₂S₂O₈投加量为0.12 g/g时，有机质减少率可达34.75%，污泥比阻与对照组相比可下降38.5%。

关键词: 污泥, 厌氧发酵, 短链脂肪酸, 过硫酸钾

CLC Number: 

• X703.1