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' 9.. 1840 Fenpark Drive Fenton, Missouri 63026-2922 Redux Corporation 314-343-0030 • FAX 343-0298 PASELLA TRUCKING, INC. STOCKTON, CALIFORNIA WATER TREATMENT PROCESS DWGRIPTIOR The waste water treatment system supplied to Panella Trucking by Redux Corporation is a combination of dissolved air flotation (DAF), rapid sand filtration and sludge dewatering. A proven combination of technologies which lends itself effective to the type of waste water generated by the washing of vehicles and their parts. Redux utilized both bench scale testing and pilot system studies to determine the nature and any hidden characteristics of the waste water prior to designing the equipment supplied. Oil, greases and suspended solids are the major contaminants encountered in Panella's waste water. During the test work performed at Redux the analytical results depict the removal efficiency of the system (attachment "A"). The following is a description of the equipment supplied by Redux and its function in the water clarification process. The waste water will flow from the truck washing process into a sump basin. This sump basin will gravity flow into two tanks located underground which Redux will be utilizing as dirty water storage tanks. The basic function of dirty water storage tank is to provide collection of the waste stream equal to or greater than one hours running time of the DAF system. DAF systems require approximately 5 to 15 minutes of start up operation to establish dissolved air and chemistry equilibrium. The other use of these tanks is to provide mixing (or equalization) so that the water being treated by the DAF system is consistent in its levels of suspended solids, oils and greases. The water is circulated inside these two dirty water storage tanks via a submersible solids handling pump. This pump also simultaneously serves as a transfer pump by moving the water on to Redux coagulant mix tank. This tank is used for three purposes: 1) it provides contact time for the emulsion breaking/ coagulate chemical to interact with the contaminants in the waste water. This is necessary to achieve the highest possible reduction of the oils and greases. 2) it provides a secondary mixing of the water just prior to its treatment in the DAF system. 3) and it provides, if necessary, a point to adjust the pH for optimum treatment efficiency. It should be noted that this tank is not under pressure, which is the safest and most economical way to adjust the pH of a waste stream. The injection of the pH adjusting reagent is done with a proportional chemical feed pump which will come on and go off automatically by a signal it receives from a pH analyzer.