摘要
本文就超声波处理对一次污泥强化沉降与脱水性能进行了研究。对污泥性质中的SV、滤饼含水率、比阻、粘度等进行了分析。分析表明短时间的超声作用可以提高污泥脱水和沉降性能,超声处理7s后滤饼含水率降低2.9%；超声10s时粘度和比阻值最小,比原污泥分别减小29.4%和24.2%；15s后污泥沉降速率是原污泥的3.7倍。如投加絮凝剂,投加量为0.054g/L时污泥沉降速率最快,最终污泥体积为84.5%,粘度值最低,为84.5mpa·s。加入超声10s作用后,最佳絮凝剂投加量为0.027g/L,且最终污泥体积比单独投加0.054g/L时减小4%,粘度值降低14.8%。超声波与絮凝剂的联用可以改善污泥脱水性能和沉降性能,减小絮凝剂的量达一半以上。
The pretreatment of primary sewage sludge using ultrasound is studied to improve settling and dewatering characteristics of the sludge. The dewatering properties are characterized by SV, water content of centrifuged sludge, COD, VFA, viscosity and specific resistance. The optimal ultrasonic conditions are 10s and 0.45W/ml. Under such conditions, the sludge viscosity and specific resistance are reduced by 29.4% and 24.2%, respectively. Water content of the centrifuged sludge is reduced by 2.9% after 7s ultrasonic treating, and the sludge settlement velocity after 15s ultrasonic treatment is 3.7 times of original sludge. The sludge volume is 84.5% and the viscosity is 84.5mpa.s when a coagulant dose, PAM, alone is 0.054g/L; after adding 10s ultrasound, these values reduce by 4% and 14.8% respectively with the coagulant dose of 0.027g/L. The combination of ultrasound and coagulant greatly enhances sludge dewatering and reduces the necessary dose of the coagulant from 0.05g/L to 0.027g/L.
出处
《应用声学》
CSCD
北大核心
2006年第4期206-211,共6页
Journal of Applied Acoustics
关键词
超声波
一次污泥
脱水性能
聚丙烯酰胺
Ultrasound, Primary treated sludge, Dewaterabillity, PAM
