文章基本信息

标题：NEW APPROACH TO MODELLING SAND FILTER CLOGGING BY SEPTIC TANK EFFLUENT
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作者：Jakub Nieć ; Marcin Spychała ; Paweł Zawadzki 等
期刊名称：Inżynieria Ekologiczna
印刷版ISSN：2081-139X
电子版ISSN：2392-0629
出版年度：2016
卷号：17
期号：2
页码：97-107
DOI：10.12911/22998993/62296
出版社：Polish Society of Ecological Engineering (PTIE)
摘要：The deep bed filtration model elaborated by Iwasaki has many applications, e.g.solids removal from wastewater.Its main parameter, filter coefficient, is directly related to removal efficiency and depends on filter depth and time of operation.In this paper the authors have proposed a new approach to modelling, describing dry organic mass from septic tank effluent and biomass distribution in a sand filter.In this approach the variable filter coefficient value was used as affected by depth and time of operation and the live biomass concentration distribution was approximated by a logistic function.Relatively stable biomass contents in deeper beds compartments were observed in empirical studies.The Iwasaki equations associated with the logistic function can predict volatile suspended solids deposition and biomass content in sand filters.The comparison between the model and empirical data for filtration lasting 10 and 20 days showed a relatively good agreement.
关键词：clogging ; filter coefficient ; mathematical modelling ; sand filter ; solids deposition ; suspended solids ; biofilm processes