WATER TREATMENT METHOD AND WATER TREATMENT APPARATUS

As a countermeasure for calcium fluoride scale in reverse osmosis membranes, a water treatment method and apparatus are provided that can add a scale inhibitor at an appropriate addition amount. A water treatment apparatus for treating water to be treated that contains fluorine and calcium by passin...

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Bibliographische Detailangaben
Hauptverfasser:	SUZUKI, Yudai, SUDO, Fumio, MORITA, Nau
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMISTRY METALLURGY PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL SEPARATION TRANSPORTING TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Beschreibung
Zusammenfassung:	As a countermeasure for calcium fluoride scale in reverse osmosis membranes, a water treatment method and apparatus are provided that can add a scale inhibitor at an appropriate addition amount. A water treatment apparatus for treating water to be treated that contains fluorine and calcium by passing the water through at least a reverse osmosis membrane includes pH adjustment means for adjusting the pH of the water to be treated in a supply line, means for measuring the concentration of fluoride ions in the water to be treated and then determining the amount of scale inhibitor to be added by an addition means based on the measured fluoride ion concentration. After the scale inhibitor is added from an addition line, permeate from a permeate line and concentrate from a concentrate line are discharged from the reverse osmosis membrane.