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Performance of slow sand filters in treating secondary effluent using different sizes of local sand

Al-Yousef, Ali Khamis (1990) Performance of slow sand filters in treating secondary effluent using different sizes of local sand. Masters thesis, King Fahd University of Petroleum and Minerals.

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English Abstract

This study is aimed to evaluate slow sand filtration as tertiary treatment of secondary wastewater effluents at pilot scale using different sizes of local sands. The wastewater was taken from extended aeration Treatment Plant of North Aramco. Two different sizes of local sand with effective sizes of 0.31 mm and 0.56 and 55 cm were investigated. The investigation was carried out over a period of about one year in order to include the seasonal variations in wastewater influent quality to the filter. It was found that the percent removal for all the parameters analyzed were decreasing by decreasing the sand depth and/or by increasing the sand size. The pilot scale filter was successfully able to achieve consistent results. The average percent removals of turbidity, BOD, COD, standard plate counts, and total coliform bacteria were 95, 89, 67, 93 and over 99%, respectively. In view of the results, it was found that efficiency of the filter at all sand depts and sizes with respect to the percent removal of bacterial contaminants were exceptional to an extent that the effluent would easily qualify for unrestricted irrigation according to the standards employed in the Kingdom. Also, it was found that the filter could be operated until the sand depth is reduced to 55 cm. due to cleaning purposes without any problem. The starting depth of the filter sand was 145 cm. The average percent removals of turbidity, BOD, COD, bacteria were 91, 83, 50, 88 and over 93%, respectively, in a sand bed of 55 cm. The effect of the sand size on percent removal was marginal. It may be suggested to use coarse sand with deeper bed compared to fine sand of shallow bed to get the desired efficiency.



Item Type:Thesis (Masters)
Date:June 1990
Date Type:Completion
Subjects:Civil Engineering
Divisions:College Of Engineering Sciences > Civil Engineering Dept
Creators:Al-Yousef, Ali Khamis
Committee Advisor:Farooq, Shaukat
Committee Members:Ishaq, Achi M. and Al-Layla, Rashid I.
ID Code:10443
Deposited By:KFUPM ePrints Admin
Deposited On:22 Jun 2008 17:05
Last Modified:30 Apr 2011 15:34

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