METHOD FOR PURIFYING WATER EMPLOYING AUTOMATIC CONTROL OF AMOUNT OF CHEMICAL AGENT TO BE INJECTED

摘要

PURPOSE:To reduce the pouring amount of a chemical agent, by controlling the pouring amount of the chemical agent by using three elements, i.e. the turbidity, the water temp. and the alkalinity of raw water to automatically control the pouring amount of the chemical agent based on a definite formula with a simple form. CONSTITUTION:The part of raw water is flowed through a turbiditymeter 15, a thermometer 16 and an alkalinity meter 17 from a defoaming tank 14 to measure the turbudity, the water temp. and the alkalinity thereof. The signals therefrom are converted in a converter 18 to be put in a computer 19. On the other hand, the water flow meter 25 of treated water provided to the inflow pipe of a precipitation basin measures the amount of water to apply the signal therefrom to the computer 19 and the signal of the pouring amount of a chemical agent is issued from the computer 19 to be put in an regulator 28. This regulator 28 uses the signals from the computer 19 as objective values to compare the same to the signal obtained by converting the flow amount signal of a chemical agent pouring amount meter 22 by a converter 30 and issues an opening signal or a closing signal to the control valve 23.