Patent ID: 6325941
Filing Date: 2001-12-04
Classification: B01D,C09K,Y10S

Abstract:
A method for controlling quality of a fluid which is to be purified, the method comprising the steps of:(a) providing a filter for filtering the fluid;(b) conveying a first portion of unfiltered fluid to the filter through a first passageway;(c) discharging filtered fluid from the filter and a second portion of unfiltered fluid through a second passageway;(d) controlling proportions of the fluid flowing through the first and second passageways;(e) analyzing the fluid discharged through the second passageway by determining acid content of the fluid;(f) increasing the proportion of fluid flowing through the first passageway which is conveyed to the filter if the acid content of the fluid discharged through the second passageway is above industry standards; and(g) decreasing the proportion of the fluid flowing through the first passageway which is conveyed to the filter through the first passageway if the acid content of the discharged fluid is appreciably below industry standards.