WATER TREATMENT METHOD AND WATER TREATMENT SYSTEM

PROBLEM TO BE SOLVED: To provide a water treatment technology capable of reducing the final amount of sludge and achieving higher treatment efficiency even when a treatment for removing a fluoride ion in water to be treated containing a fluoride ion and a magnesium ion is conducted.SOLUTION: There i...

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Bibliographische Detailangaben
Hauptverfasser: MURAKADO KOHEI, TAKEUCHI KOTAKU, MORIKAZU SHINGO, TAKAHASHI KENJI, NISHIUCHI TORU
Format: Patent
Sprache:eng ; jpn
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Zusammenfassung:PROBLEM TO BE SOLVED: To provide a water treatment technology capable of reducing the final amount of sludge and achieving higher treatment efficiency even when a treatment for removing a fluoride ion in water to be treated containing a fluoride ion and a magnesium ion is conducted.SOLUTION: There is provided a water treatment method including an alkali addition process for adding an alkali agent to water to be treated containing a fluoride ion and a magnesium ion to generate a dispersion material in water to be treated, a solid solution separation process for solid solution separating the dispersion material in which the fluoride ion is taken, an acid addition process for adding acid to a sludge derived from the solid liquid separated dispersion material and an aging process for stirring the sludge for predetermined time after adding the acid.SELECTED DRAWING: Figure 1 【課題】フッ化物イオン及びマグネシウムイオンを含有する被処理水からフッ化物イオンを除去処理する場合に、最終的なスラッジの量を低減可能であると共に、より高い処理効率を実現可能な水処理技術を提供する。【解決手段】フッ化物イオン及びマグネシウムイオンを含有する被処理水にアルカリ剤を添加して、前記被処理水中に懸濁物質を生成させるアルカリ添加工程と、前記フッ化物イオンが取り込まれた前記懸濁物質を固液分離する固液分離工程と、固液分離された前記懸濁物質由来のスラッジに酸を添加する酸添加工程と、前記酸を添加した後に、前記スラッジを所定時間撹拌する熟成工程と、を含む水処理方法を提供する。【選択図】図1