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* Capacity for ENOX addition into water stream prior to each <br /> reactor <br /> * Capacity of 03 recycle <br /> * Residual 03 destruct catalyst for off-gas <br /> * Capacity of varying power lamps in the reactors <br /> * Capacity to draw samples at several points <br /> * Automatic pH control <br /> * System Controller (PLC) . <br /> The optimum process configuration used will vary from one type <br /> of waste stream to another. <br /> COST FACTORS <br /> The cost and design considerations for a second-generation <br /> enhanced ozidation system like Rayox will depend on four major <br /> considerations: <br /> * The nature of the contaminant: affects the choice of oxidant <br /> and ENOX as well as the type of ultraviolet light required <br /> * The initial concentration: affects the number, size, and <br /> design of the reactors, as well as the lamp power to be used <br /> * The degree of removal required: affects the processing time, <br /> the number and nature of the teatment stages, as well as the <br /> reactor design. <br /> It is normally advisable to optimize the process configuration <br /> in a treatability study before on-site field work begins. <br /> -10- <br />