Recycling Wastewater by Drip Irrigation

by Win Bui, Hawaiian Sugar Planters' Assoc, Aiea, United States,

Document Type: Proceeding Paper

Part of: Irrigation and Drainage: Saving a Threatened Resource—In Search of Solutions


Hawaii's sugar factories produce about 380 million liters of wastewater per day from sugarcane washing, condensation, and cooling operations. Since 1972, wastewater has been used to irrigate sugarcane through furrows instead of being discharged into the ocean. The practice of drip irrigation using wastewater mixed with fresh water was initiated in 1979 to improve efficiency and to increase yields. Currently used drip tubes can handle 100% treated wastewater. This paper explains how wastewater is recycled through drip irrigation systems and describes our long-term plans.

Subject Headings: Cooling (wastewater treatment) | Wastewater management | Irrigation systems | Water reclamation | Economic factors | Temperature effects | Furrow irrigation | Water discharge | Hawaii | United States

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