Garage Wastewater Turbidity Removal Using Low Cost Soil Coagulant
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Date
2016-11
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Addis Ababa University
Abstract
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.
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Keywords
Garages or vehicle