超声波参数对剩余污泥中SCFAs和EHCs释放的影响

RESEARCH ON INFLUENCING FACTORS OF SONICATION ON SCFAs AND ECHs RELEASE FROM WASTE ACTIVATED SLUDGE

考察了不同超声处理参数下剩余污泥中短链脂肪酸SCFAs和易水解组分EHCs的释放特性。结果表明:超声波作用下SCFAs的最大释放量为197.0 mg/L,超声时间对SCFAs释放影响显著;在超声时间为100 min内,声能密度小于0.6 W/mL时,EHCs释放随超声时间和声能密度的增加而提高;在相同能耗下,长超声时间、低声能密度的超声处理条件更有利于获得较高的EHCs,超声时间对EHCs释放的贡献度高于声能密度;释放的EHCs以糖类为主,经短时间水解酸化可生成较高浓度的SCFAs。

Ultrasonic technology was used to treat waste activated sludge（ WAS）,in order to investigate the influencing factors of sonication to the releasing of short-chain fatty acids（ SCFAs） and easy-hydrolysis components（ EHCs） from WAS.The result showed that SCFAs were released with the highest amount of 197. 0mg / L after the treatment of sonication,and ultrasonic time was the dominant factor; the amount of released EHCs increased with ultrasonic duration and intensity when the ultrasonic duration was shorter than 100 min,and the ultrasonic intensity was lower than 0. 6 W / mL; at the same ultrasonic energy level,a longer ultrasonic duration and lower ultrasonic intensity resulted in more effective EHCs release; carbohydrate was the most important component in released EHCs,which could be easily transformed into SCFAs in short time of hydrolysis and acidification.