594 Fermentation and Biochemical Engineering Handbook Please note that the proposed EPA drinking water standards reduces the coliform count from l to o per 100 ml. All types of water discussed from this point on will fall under the category process water 5.0 WATER PRETREATMENT After the break tank, process water is treated using various equip ment and technologies depending on its intended use and the water analysis Some of the technologies are: multimedia filtration, water softening, acti ated carbon adsorption, UV treatment, deionization, ultrafiltration, reverse osmosis. final filtration and distillation Figures I and 2 depict two alternative equipment trains for treating However, these diagrams are not all inclusive. For example, if the analysis shows a high concentration of insoluble iron oxides, the first step would be to inject a flocculent agent and then filter. Cle be removed by the softener or the Fig. I system Potable bution Figure 1. Water pretre