OPTIMIZATION OF MOTOR VEHICLE INDUSTRIES WASTEWATER TREATMENT METHODS WITH THE AIM OF HEAVY METALS REMOVAL AND WATER REUSE IN PILOT SCALE

The waste of motor vehicle industries is mainly the result of washing, coloring and various stages ofchassis manufacturing, which include oil, grease, dyestuff, chromium, phosphate and other pollutants. inthe present research, extended aeration activated sludge biological treatment plant is being consideredand evaluated, for the removal of heavy metals and pollution load from industrial wastes and sanitarywastewaters, and on the pilot scale for optimization of waste treatment method for motor vehicleindustries. to accomplish the pilot experiments, the natural waste of bahman motor vehicle factory isused. effective factors on efficient removal of heavy metals and pollution load such as concentration ofbiological mass (mlvss), cod, bod, ph in the extended aeration activated sludge biological treatmentsystem, in different ratios of the mixing of industrial waste to sanitary wastewater have beenexperimented and evaluated. the performance of the above system, in the best of conditions, removesabout 90% of pollution load and 65% of heavy metals existing in the industrial wastes. after analyzingthe experiments, it is concluded that the removal of heavy metals through biological methods is possibleand moreover it is feasible to biologically treat the mixing of motor vehicle industries effluent andsanitary wastewater up to the ratio of one to one, if guided exactly and scientifically.