| 摘要 |
PURPOSE:To remove efficiently boron by using a water-soluble polymer having a hydroxyl group to form an insoluble deposit in the presence of an Al compd. and a Ca compd. as a pretreatment, and then separating solid from liq. CONSTITUTION:When waste water contg. boron is treated with a resin for adsorbing boron, a water soluble polymer having a hydroxyl group (e.g., water- soluble polyvinyl alcohol) is used to form the insoluble deposit of boron in the boron-contg. waste water in the presence of an Al compd. such as Al sulfate and a Ca compd. such as slaked lime as a pretreatment, and then the deposit is separated from the liq. The separated water having a low content of boron is brought into contact with the resin for adsorbing boron, and the concn. of boron can be reduced to <=1-2mg/l. By this flocculating sedimentation method, the amt. of sludge generated can be reduced to 1/2-1/3 in comparison with the conventional method, and furthermore boron can be efficiently removed.
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