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The organisation of sewers and systems is closely related to the different types of industry and, as a result, a whole array of configurations exist. In all cases, it is essential to avoid unnecessary dilution during treatment. The following principles must be carefully followed: - cooling water, if not treated in an open recirculating system, and non-polluted rain water are discarded in separate systems, - waste process waters presenting high toxic concentrations or specific pollutants are collected separately, as for example, cyanide water, chromate water, saline water, - potentially polluted rain water is conveyed to the treatment plant, - water. | e-books download weblog http www.tooraj-sabzevari.blogfa.com water engineering weblog 26 INDUSTRIAL PROCESSES AND THE TREATMENT OF WASTEWATER 1. DESCRIPTION OF TREATMENT TECHNIQUES 1.1. ORGANISATION OF SEWERS AND SYSTEMS The organisation of sewers and systems is closely related to the different types of industry and as a result a whole array of configurations exist. In all cases it is essential to avoid unnecessary dilution during treatment. The following principles must be carefully followed - cooling water if not treated in an open recirculating system and non-polluted rain water are discarded in separate systems - waste process waters presenting high toxic concentrations or specific pollutants are collected separately as for example cyanide water chromate water saline water - potentially polluted rain water is conveyed to the treatment plant - water for reclaiming or recycling is pre - treated prior to mixing with other contaminated wastewater. Equally where hydraulic and pollutant flows are too variable they are regulated by - storm tanks placed in a by-pass configuration for storing first-stage polluted water. Recovering this low-flow water and then channelling it towards purification means that treatment is not oversized - homogenisation tanks designed to store all effluents produced by a unit or entire facility for a few hours or even a few days. These tanks are fitted with mixing units. Their function is to clip pollution peaks and enable to a certain extent programming of the treatment process - safety tanks left empty and designed to store raw effluents for one or two days in case they present abnormal characteristics such as toxicity. These tanks can also be used to store effluents undergoing treatment in the event of interruption of a subsequent purification process. These two functions can be combined in one tank. SOFTbank E-Book Center Tehran Phone 66403879 66493070 For Educational Use. Chap. 26 Industrial processes and the treatment of wastewater .
