Huan Li, Yiying Jin, Mahar Rasool Bux, Zhiyu Wang, Yongfeng Nie
Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China.
J Hazard Mater. 2009 Jan 30;161(2-3):1421-6. doi: 10.1016/j.jhazmat.2008.04.113. Epub 2008 May 3.
Ultrasonic treatment can disintegrate sludge, enhance microbial activity and improve sludge dewaterability at different energy inputs. To find their relationship, the three phenomena during ultrasonic treatment were investigated synchronously, and an experimental model was established to describe the process of ultrasonic sludge disintegration. Analysis results showed that the changes of sludge microbial activity and dewaterability were dependent on sludge disintegration degree during ultrasonic treatment. When sludge disintegration degree was lower than 20%, sludge flocs were disintegrated into micro-floc aggregates and the microbial activity increased over 20%. When sludge disintegration degree was over 40%, most cells were destroyed at different degree, and sludge activity decreased drastically. Only when sludge disintegration degree was 2-5%, sludge dewaterability was improved with the conditioning of FeCl(3). It was also found that the sonication with low density and long duration was more efficient than sonication with high density and short duration at the same energy input for sludge disintegration, and a transmutative power function model can be used to describe the process of ultrasonic disintegration.
超声处理在不同能量输入下能够分解污泥、增强微生物活性并改善污泥的脱水性能。为了找出它们之间的关系，同步研究了超声处理过程中的三种现象，并建立了一个实验模型来描述超声污泥分解过程。分析结果表明，超声处理过程中污泥微生物活性和脱水性能的变化取决于污泥的分解程度。当污泥分解程度低于20%时，污泥絮体分解为微絮体聚集体，微生物活性增加超过20%。当污泥分解程度超过40%时，大多数细胞在不同程度上被破坏，污泥活性急剧下降。只有当污泥分解程度为2 - 5%时，通过FeCl₃调理可改善污泥的脱水性能。还发现，在相同能量输入下，低密度长时间超声处理比高密度短时间超声处理对污泥分解更有效，并且可以使用一个变换功率函数模型来描述超声分解过程。
