引用本文:刘禹杨,吴燕,胡保安,张铮,刘银.疏浚底泥掺外加剂真空预压脱水技术研究[J].水利水运工程学报,2013,(3):78-82
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疏浚底泥掺外加剂真空预压脱水技术研究
刘禹杨1, 吴燕1, 胡保安2, 张铮1, 刘银1
1.天津科技大学材料科学与化学工程学院;2.中交天津港航勘察设计研究院
摘要:
太湖环保疏浚工程产生的高含水率疏浚底泥量日益增加，而且会造成十分严重的二次污染.为实现底泥的快速脱水，便于资源化利用，针对底泥疏浚工程的传统堆场处置方式存在的缺点，尽快脱除由于淤泥沉降作用积累的大量上清液，采用真空预压并加入高分子絮凝剂和脱水剂的方法进行疏浚底泥脱水.同时做了空白试验，测定了排水速率，检测出水水质.试验结果表明：掺外加剂试验组疏浚底泥的含水率在650 h内从76.0%降至46.5%，而无外加剂的空白组试验含水率只降至53.4%.所用脱水剂不与絮凝剂、淤泥和淤泥中的有机质等成分发生化学反应，对出水水质无明显影响，出水的浊度、CODMn以及pH值在废水排放的规范之内.所以，真空预压并加入高分子絮凝剂和脱水剂的方法能够实现快速脱水，同时保证出水水质.
关键词:  疏浚底泥  脱水  真空预压  絮凝  含水率
DOI：
分类号:U616+.26
基金项目:
Research on dehydration technology of dredged sludge by admixture and vacuum preloading
LIU Yu-yang1, WU Yan1, HU Bao-an2, ZHANG Zheng1, LIU Yin1
1.College of Materials Science and Chemical Engineering， Tianjin University of Science ＆ Technology;2.China Communications Construction Company Tianjin Port ＆ Waterway Prospection Design ＆ Research Institute Co.， Ltd.
Abstract:
The quantity of the dredged sludge with high water content produced by environmental protection dredging engineering in the Taihu Lake increases day by day， which has caused very serious secondary pollution. In order to realize the rapid dehydration and resource utilization of sludge， and the removal of the clear liquid produced by deposition as soon as possible， vacuum preloading together with adding of polymeric flocculent and dehydrating agent is used for dehydration of the dredged sludge in consideration of many drawbacks of the traditional methods for sediment dumping yard of dredging engineering. Blank experiments are made， and dehydration rate and water quality are determined. The experimental results indicate that the moisture content of an admixture group (i.e.dredged sludge admixing polymeric flocculent and dehydrating agent) can be reduced from 76% to 46.5% in 650 hours， and the moisture content of a blank group is only reduced to 53.4%. The dehydrating agent does not react with flocculent， sludge， organic matter and so on. The reagent has no significant effect on the water quality. The turbidity， CODMn and pH of the outflow water conform to the wastewater discharge standard, so the vacuum preloading method combined with polymeric flocculent and dehydration agent can realize the rapid dehydration and keep the outflow water quality at the same time.
Key words:  dredged sludge  dehydration  vacuum preloading  flocculation  water content
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