酸処理粘土による海水中のリン酸除去

概要

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Removability of orthophosphate in seawater with the Acid Treated Clay (ATC) developed as an algicide was studied by examining the direct application of ATC to seawater samples under various pH conditions and orthophosphate concentrations. In the case of direct application of ATC, the minimum and maximum residual phosphorus (P) concentration was at pH 6 and pH 8.5, respectively. Above pH 8.5, P concentration was de-creased. ATC requirement to decrease P concentration from 0.1mg P/l to 0.01mg P/l was 200mg ATC/l at pH 8.2. The maximum adsorption of orthophosphate to ATC floc was at pH 5. The adsorbed P in ATC was 1.8mg/g (maximum) at pH 5 and also 0.4mg/g at pH 8.2. From these results, it was suggested that mechanism of removal of orthophosphate by direct application of ATC was to be as follows, 1) formation of aluminum phosphate and coprecipitation with ATC floc at about pH 6, 2) adsorption of orthophosphate in ATC floc (aluminum hy-droxide) at pH 8.5, and 3) formation of Ca-PO4 and Ca-Al-PO4 complex at above pH 8.5.
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