METHOD FOR DETERMINING CHLORINATION BREAKPOINT IN AMMONIA BEARING WATER VIA PH MONITORING AND STATISTICAL TECHNIQUE, DEVICE FOR CONTROLLING AMOUNT OF CHLORINE TO BE INJECTED, AND CHLORINE DISINFECTION SYSTEM USING METHOD

摘要

The present invention relates to a method for determining a chlorination breakpoint by performing statistical quadratic regression on values of changes in pH of a chlorination reactor at a chlorine disinfection step of a water purification or sewage treatment process, and also relates to a device for controlling the amount of chlorine to be injected and a chlorine disinfection system using the method. The method for determining a chlorination breakpoint according to the present invention comprises the steps of: introducing ammonia bearing water for chlorine disinfection into a chlorination reactor; injecting a chlorine agent into the chlorination reactor at a predetermined speed; monitoring values of changes in pH of the chlorination reactor; and obtaining a second-order polynomial regression by performing statistical regression on the monitored values of changes, and determining a minimum point of the obtained second-order polynomial regression to be a breakpoint of the amount of chlorine agent to be injected. The method for determining a chlorination breakpoint according to the present invention provides an effect of more accurately determining the amount of chlorine agent to be injected by using only a pH curve even in a low-concentration ammonia condition (a low contamination condition) in which it is difficult to determine the amount of chlorine agent to be injected by using a conventional method.;COPYRIGHT KIPO 2016