ABSTRACT
Chloride Recovered ............................................................................... 312 10.6 Summary .......................................................................................................................... 313 References .................................................................................................................................. 313
Metal industries use substantial quantities of water in processes such as metal nishing and galvanized pipe manufacturing in order to produce corrosion-resistant products. Ef uent wastewaters from such processes contain toxic substances, metal acids, alkalis, and other substances that must be treated, such as detergents, oil, and grease. These ef uents may interfere with biological treatment processes in sewage treatment plants. In case the ef uents are to be discharged directly to a watercourse, treatment requirements will be more stringent and costly [1-9].
