A Thesis On Constructed Wetlands For Greywater Treatment The Case Of Spa Service Enterprise

Wetlands have long played a significant role as natural purification systems, and have beenrneffectively used to treat domestic, agricultural and industrial wastewater. However, very littlernhas been done on the use of constructed wetlands as treatment option for greywater especially inrnEthiopia. Six experimental CW cells have been designed and constructed in order to evaluate thernperformance of constructed wetland and generate information about the effects of substratesrn(gravel, sand and scoria) and substrate-plant combination, by planting two types of plantsrn(V.anagallis-aquatica and C.bengahllnsis). In addition the two plants were immersed in greyrnwater for about a day in order to evaluate if any significant removal efficiency is shown. A totalrnof 27 samples were collected and analyzed for selected wastewater quality parameters.rnComparing the removal efficiencies of the three substrates without plantation, the highest scoresrnwere achieved by cells containing sand and scoria. The sand cell showed the best performancesrnfor orthophosphate (67.54%) and BOD5 (74.64%), and the scoria cell showed highest removalrnfor Na (66.6%) and COD (61.1%). The only parameter that showed to be statistically significantrn(p

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