Treatment and potential reuse of greywater from schools: a pilot study

Water Science and Technology : a Journal of the International Association on Water Pollution Research
Abdalrahman D AlsulailiDuaij Alrukaibi

Abstract

This study presented performance data on a low cost and easy maintenance pilot system for on-site treatment and reuse of water collected from wash sinks and fountains, as major sources of greywater (GW) at schools. Various treatment options were studied including screening, sand filtration, chlorination, and UV disinfection operated at different flow rates. Results showed that filtration operated at low rates is very effective in total suspended solids (TSS) removal, while UV proved to be more effective than chlorination for reduction of biochemical oxygen demand (BOD), chemical oxygen demand (COD), and total coliforms. Removal efficiencies up to 63%, 30% and 20% were obtained for TSS, COD and BOD, respectively and reductions of log TC (CFU/100 ml) from 6.5 to 2 were obtained at a filtration rate of 14 m3/d·m2. Treated effluent satisfied WHO standards for reclaimed water reuse in landscape irrigation and toilet flushing. The filtration-UV system is robust, showing the best and most reliable performance for low and high strength GW treatment even under a 10-fold increase in flow rate. A 5 m3/d pilot plant was developed for schools having 500 students and detailed cost-benefit analysis indicated a net saving value, a surplus of $...Continue Reading

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Citations

Sep 22, 2018·Water, Air, and Soil Pollution·Michael Oteng-PeprahNanne K deVries
Dec 17, 2018·Environmental Science and Pollution Research International·Marika TruuJaak Truu
Jul 31, 2021·The Science of the Total Environment·Carolina RodríguezEduardo Leiva

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