PURPOSE: To adequately control the amt. of ozone to be generated with respect to a flow rate of inflow water by adding an arithmetic section for correcting the control target value on the flow rate of the inflow water to the fore stage of an existing control system for the ozone to be generated.
CONSTITUTION: The raw water taken in from rivers, etc., is introduced to a flocculating and settling treatment 1, where a flocculating agent is injected into the raw water to remove sand and suspended materials. The raw water is automatically measured by a flow meter 3 and is introduced by a raw water pump 2 to an ozone contact basin 4. The gaseous raw material of an ozonizing gas is supplied by a blower 10 to an ozone generator 11 and the generated gaseous ozone is supplied as fine bubbles by a gas diffusion pipe 12 into the ozone contact basin 4, by which the dissolved org. materials in the water to be treated are oxidation decomposed. At this time, the ozone injection rate set by an ozone injection rate setter 6 is corrected by the measured value of the flowmeter 3 in the arithmetic section 7 for correcting the ozone injection rate and is transmitted to the arithmetic section 8 for the amt. of the ozone to be generated and the control section 9 for the amt. of the ozone to be generated. The effluent water from the ozone contact basin 4 enters a bioactive carbon treating device 5 where the dissolved org. materials are adsorbed away and the effluent water is subjected to the oxidation decomposition of microorganisms then to sterilization with chlorine. This water is distributed as city water.
KOMATSU NAOTO
HARA NAOKI
YAMAKOSHI NOBUYOSHI
WATANABE SHOJI
BABA KENJI
HAGA TETSURO
