摘要
中试条件下研究了颤蚓在过滤工艺中的迁移分布规律,并考察了滤速和过滤周期对颤蚓迁移分布的影响,以及反冲洗后滤池中颤蚓的分布情况。结果表明:颤蚓在滤池中沿滤床深度方向的迁移与颤蚓体长和滤料粒径有关,颤蚓体长越小、滤料粒径越大,则迁移幅度越大;滤速是颤蚓迁移的主要动力,滤速的提高会引起下层滤床中颤蚓数量的增加,颤蚓泄露风险加大;过滤周期的延长将促进颤蚓的迁移,适当缩短过滤周期有利于水厂颤蚓泄露风险控制;反冲洗可以实现颤蚓从净水工艺中的彻底去除,反冲洗强度越大,颤蚓的去除效果越好。为有效控制颤蚓泄露风险,滤池滤速和过滤周期宜分别控制在9.4 m/h和12 h以下,反冲洗强度则控制在25 L/s.m2左右,此时颤蚓去除率为97.7%。
The rules of migration and distribution regulation of tubifex in filtration were studied in the pilot system. Meanwhile, the influences of filtration rate, filtration cycle and backwashing on the worm＇s migration and distribution in filtraion were discussed. The results showed that both the worm＇s length and the particle size of filter media had obvious effects on migration and distribution： the smaller the worm＇s length and the larger the particle size of filter media were, the stronger the worm＇s migration capacity was. The filtration rate was the main migration power of tubifex in filtration, which meant high filtration rate could result in the worm＇s leakage risk. Prolonging filtration cycle promoted migration, thus it is beneficial to control tubifex leakage risk that shortening filtration cycle. The remove of tubifex in a real sense can be realized by backwashing. And the stronger the backwashing intensity is, the better the removal efficiency is. Based on the experimental results, to control the worm＇s leakage risk effectively, filtration rate and cycle would be lower than 9. 4 m/h and 12 h, respectively. Backwashing intensity would be controlled about 25 L/s · m^2 , at which the obtained tubifex removal efficiency was 97.7%.
出处
《土木建筑与环境工程》
CSCD
北大核心
2010年第5期88-92,共5页
Journal of Civil,Architectural & Environment Engineering
基金
国家重大科技专项课题(2009ZX07423-003)
教育部创新团队支持项目(IRT0853)
关键词
颤蚓
滤池
迁移
分布
tubifex
filtration
migration
distribution
