07-11-2017, 10:31 AM
Samples of wastewater were collected at different service points of a typical automobile garage and then characterized by parameters such as pH, total solids, total suspended solids, chemical oxygen demand (COD) and oil and grease. A composite sample was also prepared on the basis of the wastewater generation pattern. The results of the characterization revealed that oil and fat and COD were two main parameters of contamination worrying. The oily composite waste water was first treated using coagulants such as alum, FeSO4 and CaCl2. The results showed that the removal is feasible for the initial oil concentration in the range of 300 - 600 mg / L for the alum dose of 100 - 400 mg / L, alum + bentonite dose of 20 - 250 mg / L and FeSO4 50 - 200 mg / L. Subsequently, the treatment of the composite wastewater with acclimated suspended biomass (activated sludge) produced approximately 18-68% elimination efficiency for the initial concentration of oil and fat of 300-600 mg / l during the batch period of 18 - 30 hours.
In India vehicles are increasing day by day in these vehicles the maximum number is occupied by two wheels at the same time that the service center for the maintenance of these vehicles also increases. The activities carried out in the service center generate wastewater that includes oil and grease. These oils and fats are organic matter and also biodegradable, but it takes longer to degrade naturally and separate from water. That oil forms a layer on the surface of the water. In STP there is a skimmer tank to separate the oil from the water, but this method is also not suitable any longer since the oil is clogged in the skimmer tank and other STP units. It is difficult to clean, maintain and run the units. Therefore, it is necessary to eliminate the oil and fat in the same source
In India vehicles are increasing day by day in these vehicles the maximum number is occupied by two wheels at the same time that the service center for the maintenance of these vehicles also increases. The activities carried out in the service center generate wastewater that includes oil and grease. These oils and fats are organic matter and also biodegradable, but it takes longer to degrade naturally and separate from water. That oil forms a layer on the surface of the water. In STP there is a skimmer tank to separate the oil from the water, but this method is also not suitable any longer since the oil is clogged in the skimmer tank and other STP units. It is difficult to clean, maintain and run the units. Therefore, it is necessary to eliminate the oil and fat in the same source