Published: May 1969
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Water quality is a function of both the source of water and its intended use. The quality of a given stream can only be defined in terms of the requirements of the system in which it is being received or from which waste water is discharged. The waste water from one industrial process may well be the source of supply for another (discussed further in Chapter I). Before one can control water quality, a great deal must be known about both the chemical and physical characterizations of possible water sources, and the exact requirements for the water to be used in the plant process. Thus, it is necessary to develop a detailed evaluation program to determine the constituents in the supply water. Knowing the specific requirements of the supply water, one then can set out to develop the proper treatment program. Once the treatment program is started, analytical data are needed to determine its effectiveness. Overtreatment causes unnecessary expense, and undertreatment also will cost money because of equipment inefficiency or failure, plus resulting downtime, maintenance expense and reduced product quality. One may conclude that test methods are needed for both the analytical program and the subsequent monitoring program.