METHOD FOR THE DETERMINATION OF DISSOLVED AND COLLOIDAL DISTURBING SUBSTANCES IN A PAPERMAKING PROCESS

摘要

The invention relates to a method for determining dissolved and colloidal disturbing substances in the pulp, process water or waste water of paper production, the method comprising the following steps : a) forming a water fraction of the pulp, process water or waste water of paper production; b) measuring the turbidity of said water fraction in order to get a first turbidity value; c) after the turbidity measurement, decreasing the pH of the water to a specific pH value; d) measuring the turbidity of water having a specific pH value in order to get a second turbidity value; and e) calculating the turbidity difference between the first turbidity value and the second turbidity value, the turbidity difference correlating with the amount of dissolved and colloidal disturbing substances present in the pulp, process water or waste water. The invention also relates to a method for controlled removal of dissolved and colloidal disturbing substances from a papermaking process.