Patent ID: 6656365
Filing Date: 2003-12-02
Classification: C02F

Abstract:
A process for preventing formation of scale in a water system which contains ozone for disinfection comprising:(i) determining by a measurement an optimum range of an average molecular weight of a polymeric scale inhibitor having a high molecular weight for preventing formation of scale after decomposition of the polymeric scale inhibitor by ozone, from a relationship between the average molecular weight of the polymeric scale inhibitor and an effect of preventing formation of scale, (ii) determining by a measurement a relationship between a rate of supply of the ozone and a rate of decomposition of the polymeric scale inhibitor, (iii) determining an initial average molecular weight of the polymeric scale inhibitor which provides an average molecular weight within the optimum range for preventing formation of scale after the polymeric scale inhibitor is decomposed by the ozone from the rate of supply of the ozone and a period of time of contact between the polymeric scale inhibitor and the ozone; and (iv) adding the polymeric scale inhibitor having the determined initial average molecular weight into the water system.