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WRRCTR No.128 Treatment of Mililani STP Effluent for Drip Irrigation of Sugarcane

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Title: WRRCTR No.128 Treatment of Mililani STP Effluent for Drip Irrigation of Sugarcane
Authors: Liu, Edward K.F.
Young, Reginald H.F.
Keywords: advance waste treatment
sewage effluents
drip irrigation
physical-chemical treatment
wastewater reuse
LC Subject Headings: Microirrigation -- Hawaii -- Oahu.
Mililani (Hawaii)
Sewage irrigation -- Hawaii -- Oahu.
Sewage -- Purification -- Filtration.
Sugarcane -- Irrigation -- Hawaii -- Oahu.
show 1 moreWater reuse -- Hawaii -- Oahu.
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Issue Date: Jul 1979
Publisher: Water Resources Research Center, University of Hawaii at Manoa
Citation: Liu EKF, Young RHF. 1979. Treatment of Mililani STP effluent for drip irrigation of sugarcane. Honolulu (HI): Water Resources Research Center, University of Hawaii at Manoa. WRRC technical report, 128.
Series/Report no.: WRRC Technical Report
Abstract: The secondary effluent of the Mililani STP is intended for use in the drip irrigation of sugarcane. The relative success of this waste water reuse application is affected by the concentration of suspended solids in the sewage effluent. Chemical coagulation, dissolved air flotation, and granular media filtration were studied in the laboratory to determine the most cost-effective means of obtaining a sewage effluent with a suspended solids content similar to that of the water from Waiāhole Ditch presently used in drip irrigation. Of the three methods tested, granular media filtration with anthracite coal-silica sand media at a flow rate of .00l 7 m^3/s/m^2 (2.5 gpm/ft^2) was a cost-effective method of producing a sewage effluent with suspended solids concentration in the range of that found in Waiāhole Ditch water during dry weather. Model laboratory testing shows that application of this sewage effluent will not adversely affect the type of filter media used in drip irrigation. Preliminary analysis of the residual solids distribution found in the sewage effluent after this posttreatment shows that failure of the drip irrigation system due to excessive plugging should not be a problem. The estimated annual cost of this treatment system is $147,000 based on a 0.16-m^3 /s (3.6-mgd) flow, or $40,830/mgd.
Sponsor: Board of Water Supply and Department of Public Works, City and County of Honolulu Grant/Contract No. 14-34-0001-9013
Pages/Duration: viii + 32 pages
Appears in Collections:WRRC Technical Reports

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