グリーンラスト/フェライト循環処理法によるセレン汚染水処理の連続実証試験

概要

論文の詳細を見る
In the previous reports we proposed a novel selenium removal process called Recycled Green rust/Ferrite Process, composed of an addition of ferrous ion source, an alkaline conditioning of a concentrated slurry, an anaerobic chemical reaction stage, and a return of the settled slurry after solid-liquid separation. This paper describes the results of continuous feeding test carried out in a pilot-scale plant with a feeding capacity 0.6 m3/h. Approximately 860-hour-feeding test was performed using the selenium-contaminated groundwater whose averaged selenium concentration of 0.88 mg/L. Selenium concentration in the effluent from thickener maintained less than 0.01 mg/L (selenium removal rate of 99%) until a net operating time reached 800 hours. For that period, oxidation-reduction potential leveled off -740mV vs Ag/AgCl electrode, and Fe2+/T-Fe ratio ranged from 0.61 to 0.68, indicating a strong reducing condition suitable for selenium removal. However, selenium removal deteriorated after 800h, when the liquid temperature fell below 17 degrees Celsius. In addition, results of the selenium concentrations were in qualitative agreement with the predicted values based on the simple reactor model using a continuous stirred tank reactor in series. These experimental findings demonstrated that our proposed process served a promising technique for selenium-contaminated water.
社団法人資源・素材学会の論文
2006-08-25