Ultrasonic reduction of excess sludge from the activated sludge system.
Ultrasonic reduction of excess sludge from the activated sludge system.
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DOI：
10.1016/j.jhazmat.2007.01.133
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发表时间：
2007-07
影响因子：
13.6
通讯作者：
Guangming Zhang;Panyue Zhang;Jinmei Yang;Yanming Chen
中科院分区：
文献类型：
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作者：
Guangming Zhang;Panyue Zhang;Jinmei Yang;Yanming Chen
长期以来，污泥处理一直是污水处理厂最具挑战性的问题。以往的研究表明，臭氧或氯气能有效地将污泥液化成基质，在曝气池中进行生物降解，从而减少剩余污泥。采用超声波法对序批式活性污泥法(SBR)系统中的剩余污泥进行处理。在外部声波池中，部分污泥在超声波作用下分解成溶解的基质，然后返回SBR进行生物降解。结果表明，超声波(25 KHz)能有效地液化污泥。污泥减量的最佳条件为：污泥超声比为3/14，超声强度为120kW/kgDS，超声时间为15min。剩余污泥量减少了91.1%，降至17.8 mg/(LD)，对SBR中污泥的有机物含量和沉降性没有影响。化学需氧量(COD)的去除效率为81.1%，总氮(TN)的去除效率为17-66%，出水磷浓度较高。
Sludge treatment has long become the most challenging problem in wastewater treatment plants. Previous studies showed that ozone or chlorine effectively liquefies sludge into substrates for bio-degradation in the aeration tank, and thus reduces the excess sludge. This paper employs ultrasound to reduce the excess sludge from the sequential batch reactor (SBR) system. Partial sludge was disintegrated into dissolved substrates by ultrasound in an external sono-tank and was then returned to the SBR for bio-degradation. The results showed that ultrasound (25kHz) effectively liquefied the sludge. The most effective conditions for sludge reduction were as following: sludge sonication ratio of 3/14, ultrasound intensity of 120kW/kgDS, and sonication duration of 15min. The amount of excess sludge was reduced by 91.1% to 17.8mg/(Ld); the organic content and settleability of sludge in the SBR were not impacted. The chemical oxygen demand (COD) removal efficiency was 81.1%, the total nitrogen (TN) removal efficiency was 17–66%, and high phosphorus concentration in the effluent was observed.