PURIFYING TREATMENT OF EUTROPHICATED UNTREATED WATER

摘要

PURPOSE: To recover completely algae and minimize the formation of trihalomethane in the untreated water treatment for tap water by treating the untreated water in the upward flow by using a specified filter medium, simultaneously injecting an inorganic flocculant for the purposes of cohesion effect and fixing and removing fluted phosphorus of SS purify eutrophicated untreated water. ;CONSTITUTION: In the purifying treatment process of untreated water from eutrophicated lakes or rivers, the raw water is flowed in the upward flow to a filter layer 3 using a filter medium composed of foamed plastic of irregular shape to retain the particle size of 0.5-15mm and porosity or 60-80% as a carrier and treated therein. Simultaneously, for the purposes of improving cohesive effect of SS and solidifying and removing fluted phosphorus, an inorganic flocculant of 0.5-5mg/l is injected into an inlet 2 to purify the eutrophicated untreated water. The pre-chlorine and intermediate chlorine treatment processes is dispensed with by the arrangement, and the chlorine injection quantity for the final stelization can be reduced to a great extent.;COPYRIGHT: (C)1994,JPO&Japio