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Title: Garage Wastewater Turbidity Removal Using Low Cost Soil Coagulant
???metadata.dc.contributor.*???: Teshome Werku (Mr.)
Mohammed, Berhanu
Keywords: Garage Wastewater;Turbidity;Soil Coagulant
Issue Date: Nov-2016
Publisher: AAU
Abstract: Garages or vehicle service stations release very turbid, darkened effluent. They majorly composed of clay, phosphors and oil and grease which are potential to cause harm to aquatic life, give way to invasive spices and gradually dead water bodies. Garage wastewater discharge and spillage is wide spreading but Overlooked section of pollution. Turbidity of the effluent wastewater is one and more general parameter manifesting wastewater’s pollution. Though the conventional methods like skimming tanks and oil-grease traps remove turbidity including the oil and grease, but not up to the desired extent. Keeping in view of this, an effective and efficient method of turbidity removal study was made by coagulating turbid composite sample wastewater, by a jar test using locally available activated soil coagulant. And also it was analyzed then compared with the dominantly used alum coagulant which is possible to pose environmental and health impacts. The efficiency of turbidity removal by coagulation of both of these coagulants was observed considering parameters of coagulant type (Alum and Soil), dose (50 mg/l, 500 mg/l and 1000 mg/l), pH (5,7 and 9) and settling or dentation and time(15min, 30 min and 60 min). The results showed that soil from Buka was a potential coagulant with turbidity removal efficiency 97% while Alum has 98% removal efficiency turbidity in wide range of pH (5-9) and reduced Electrical Conductivity. Both of the coagulants better performed with 50 mg/l dose and neutral (7) pH conditions. After the coagulation the alum treated wastewater drops the initial pH 1.87 to acidic pH and the soil changed the pH 0.77 which is 0.53 to acidic pH and 0.24 to basic pH. In addition the use of these coagulants has changed the electrical conductivity of the raw wastewater significantly. As result this indigenous technology may be adopted at the source to remove oil and grease containing garage wastewater since it was found efficient and effective. Therefore Indigenous knowledge search and application for native problems is very important.
Appears in Collections:Enviromental Engineering

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