| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce a residual trihalomethane(THM) production concentration and to suppress an ozone injection quantity to the absolute minimum by being estimated the residual THM production concentration in an ozone treated water and controlling the ozone injection quantity into an ozone treating device, based on the estimated quantity, in an advanced water purifying plant. SOLUTION: Raw water taken in from river, etc., becomes water 1 to be treated with a flocculating and settling treatment, and is introduced into an ozone contact basin 2, and here injected ozone gas 15, oxidized the substance in the water 1 to be treated to become ozone treated water 3, performed an adsorption decomposition treatment with an active carbon tower at the poststage, sterilized with chlorine and being delivered as city water. A required ozone injection quantity 11 at this time is predetermined by inputting both a measured value 5 of a KMnO4 consumption value 5 of the water to be treated and a target value 13 of THM production concentration of the ozone treated water into a required ozone injection quantity calculating means 16.</p> |
