WATER TREATMENT
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专利名称：WATER TREATMENT 发明人：MURAKAMI TAKAFUMI 申请号：JP13634788
申请日：19880602
公开号：JPH0333399B2
公开日：
19910516
专利内容由知识产权出版社提供
摘要：PURPOSE:To effectively prevent the generation of scales, by removing calcium from the filtrate resulting from solid-liquid separation after the addition of calcium compound to the water to be treated and sending at least a portion of the treated water back to the addition process for the calcium compound. CONSTITUTION:The method of treating the water containing fluoride ion and sulfate ion such as the waste water resulting from flue gas desulfurization comprises the steps of adding thereto calcium compound such as calcium hydroxide, adjusting the pH to cause a predipitate as required, obtaining filtrate by conventionally effecting solid-liquid separation, removing the precipitate from the water treating device, supplying a carbon dioxide containing gas to at least a portion of the filtrate for calcium removal therefrom and returning at least a portion of the filtrate resulting from the solid-liquid separation to the addition process for the aforesaid calcium compound. This method is effective in preventing the generation of scales.
申请人：KURITA WATER IND LTD
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