超声声能密度对净水厂污泥脱水性能的影响

发布时间：2018-01-15 09:37

本文关键词：超声声能密度对净水厂污泥脱水性能的影响　出处：《中国环境科学》2017年03期 　论文类型：期刊论文

【摘要】：考察了不同声能密度(0.03,1.0,3.0,5.0W/m L)时超声作用对净水厂污泥脱水性能的影响,明确了污泥脱水性能变化的影响因素.结果表明,较低声能密度(0.03,1.0W/m L)超声作用少于10min时,污泥脱水性能可改善;而高声能密度条件下,无论超声时间长短,污泥的脱水性能均恶化.声能密度越高,污泥上清液中溶出有机物越高,絮体特性变化越明显,污泥脱水性能恶化程度越显著.在较低声能密度时,污泥的脱水性能与溶出有机物和污泥絮体特性变化无关;而在高声能密度(5.0W/m L)时,脱水性能的恶化程度与溶出有机物和絮体Zeta电位密切相关.
[Abstract]:The effect of ultrasonic action on sludge dewatering performance in water purification plant was investigated under different sound energy densities (0.03g / m ~ (-1) ~ (3.0) W / m ~ (L)). The influencing factors of sludge dewatering performance were determined. The results showed that sludge dewatering performance could be improved when the ultrasonic action of low sound energy density was less than 10 min. However, under the condition of high acoustic energy density, regardless of the ultrasonic time, the dewatering performance of sludge deteriorated. The higher the sound energy density, the higher the dissolved organic matter in the sludge supernatant, and the more obvious the change of flocs characteristics. The worse the sludge dewatering performance is, the less the sound energy density is, the less the sludge dewatering performance is with the change of dissolved organic matter and sludge floc characteristics. However, at high acoustic energy density of 5.0 W / mL, the degree of deterioration of dehydration performance is closely related to dissolved organic matter and Zeta potential of floc.
【作者单位】：北京工业大学建筑工程学院;
【基金】：国家自然科学基金项目(51278005) 北京市自然科学基金项目(8132007)
【分类号】：X703
【正文快照】： 在给水处理的混凝-沉淀或气浮过程中,会产生大量的净水污泥,其主要包括悬浮颗粒物、可溶性物质、部分絮凝剂水解产物等.净水污泥的性质与原水杂质的组成及投加的混凝剂种类有关.目前,大部分净水污泥多就近直接排放至天然水体中,造成水体的二次污染,因此对污泥进行处置和综合利

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