SENSOR FOR WATER QUALITY EVALUATION, WATER QUALITY EVALUATION METHOD OF SUPPLY WATER USING THE SAME, AND OPERATION CONTROL METHOD OF WATER TREATMENT PLANT

摘要

PROBLEM TO BE SOLVED: To solve such problems that regarding the phenomenon causing performance deterioration of a separating membrane due to the adsorption of components in supply water to the separating membrane for water treatment to the surface of the separating membrane, the evaluation by the conventionally used FI value is not sufficient, and the proper management of the separating membrane cannot be performed in the pre-treatment step and it is difficult to predict the timing of the washing and exchange of the separating membrane in the operation management in which the necessary amount of the separating membrane is overestimated in designing the plant.SOLUTION: The water quality is evaluated by using the same phenomenon as the adsorption of the components in the supply water to the surface of the separating membrane. That is, the effect of the water quality of the supply water is evaluated on the separating membrane by the change of the adsorption amount to the surface of a sensor using the sensor 5 which has on the surface a thin membrane 4 made of the same material as the surface material of the separating membrane and a measuring means such as a quartz oscillator 1 which measures the adsorption amount to the thin membrane.