As希薄含有廃水におけるFe(III)およびAl(III)によるAs除去への表面錯体モデルの適用 : ヒ素希薄含有廃水処理の効率化を目的とした基礎的研究(第2報)

概要

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The diffuse layer model (DLM) of surface complexation modeling (SCM) was applied to discuss in the removal of dilute arsenic in wastewater. The equilibrium constants for complexation reactions of arsenic to ferric/aluminum hydroxide were based on several reference values and the total site capacity of ferric/aluminum hydroxide was determined by fitting to experimental results, since it is difficult to obtain surface area of amorphous hydroxide in wastewater system directly by experiment. The fitting results turns out that the total site capacity ratio becomes smaller as the concentration of ferric or aluminum hydroxide precipitates in wastewater increases. The experimental approximation formula between the total site capacity and the concentration of ferric or aluminum hydroxide precipitates was obtained. The model gave a quantitative correct description of experimental results for As(V) removal by ferric or aluminum hydroxide.The above-mentioned examination was also applied to As(V) removal in waste water with SO4. In Fe(III) salts, the total site capacities in wastewater with SO4 became a little smaller than them in wastewater without SO4, but in Al(III) salts, they are almost same value regardless of coexistence of SO4. The removal of As(V) by ferric hydroxide at pH6 were predicted quantitatively by the model, also when SO4 is contained.
社団法人資源・素材学会の論文
2005-11-25