砂ろ過における懸濁粒子の砂層流出に関する研究-ろ速変動のある場合-

概要

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There are four types of the break-through of suspended particles into the effluenｔ，ｉ．e．：　１)Initial break-through which is usually complete in 30 min. to 1 hr. from the start of a filter run ； 2)Terminal break-through occurring toward the end of filter runs，especially when pretreatment is not sufficient ； 3)Break-through which is caused by the fluctuations of the influent turbidity ； and 4･)Break-through resultant from the increased filtration rate. 　　This paper is an experimental study of the above-mentioned fourth break-through，with the purpose to understand more clearly the filtration phenomena under the increased filtration rate，of which a period lasts for 30 min. from point of 1.5 m total head loss.　　As a result， it was disclosed how the value of total head loss changed during the increased filtration rate，and that the magunitude of increase in filtration rate was more contributive to the ％ of break-through of suspended particles from sand filter than others. Some other observations are also presented.
北見工業大学の論文