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dc.contributor.author Hirano, Wesley M en_US
dc.contributor.author Young, Reginald HF en_US
dc.date.accessioned 2008-10-01T00:11:31Z en_US
dc.date.available 2008-10-01T00:11:31Z en_US
dc.date.issued 1983-01 en_US
dc.identifier.citation Hirano WM, Young RHF. 1983. Greywater reuse. Honolulu (HI): Water Resources Research Center, University of Hawaii at Manoa. WRRC technical memorandum report, 73. en_US
dc.identifier.uri http://hdl.handle.net/10125/2684 en_US
dc.description.abstract Household wastewater can be divided into "blackwater" (toilet wastewater and "greywater" (non-toilet wastewater). Recently, schemes have been proposed for the segregation of the two streams with subsequent treatment and reuse of the greywater fraction, thereby resulting in a reduction in the amount of water used and wastewater produced, recycling of nutrients, and replenishment of the groundwater. Greywater, while making up about 60 to 65% of the wastewater flow, is weaker in pollutant concentration than blackwater. Greywater contributes much of the BOD5, about half of the suspended solids, little nitrogen, and most of the phosphorus to the total wastewater flow. It also contains low levels of indicator bacteria and so must be handled and treated properly before being reused. Strategies for segregation and management of the blackwater and greywater streams are outlined. Greywater treatment schemes that include anaerobic and aerobic treatment, disinfection or filtration have been proposed and studied by a few investigators; however, substantial data are still lacking. Household greywater reuse systems have been built and found to be simple, reliable, and aesthetically acceptable. A typical system would consist of a settling/storage tank with disinfection, followed by a filter, and a pump and pressurized tank for distribution to the toilets or for lawn irrigation. Savings of 30 to 40% of the total water flow can be achieved. When reused for irrigation, a number of factors including the type of soil, topography, climate, selection of plants, method of irrigation, and quality of the greywater must be considered. Reuse of greywater for rural or suburban households in Hawaii may prove to be feasible due to the number of failing cesspools, the larger land area available for irrigation, and the rising cost of water. It could even be used in a residential house in a sewered community. At the present time, however, the cost of this system outweighs the benefits or savings achieved. In view of the increasing shortage of water though, a greywater reuse system may be an attractive alternative in the near future and should be investigated further. en_US
dc.format.extent viii + 42 pages en_US
dc.language.iso en-US en_US
dc.publisher Water Resources Research Center, University of Hawaii at Manoa en_US
dc.relation.ispartofseries WRRC Technical Memorandum Report en_US
dc.relation.ispartofseries 73 en_US
dc.subject wastewater renovation en_US
dc.subject household wastes en_US
dc.subject wastewater disposal en_US
dc.subject greywater en_US
dc.subject greywater treatment en_US
dc.subject blackwater en_US
dc.subject reuse en_US
dc.subject individual systems en_US
dc.subject.lcsh Graywater (Domestic wastewater) -- Hawaii. en_US
dc.subject.lcsh Water quality -- Hawaii. en_US
dc.subject.lcsh Water reuse -- Hawaii. en_US
dc.title WRRCTMR No.73 Greywater Reuse en_US
dc.type Report en_US
dc.type.dcmi Text en_US

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