海水
磷酸盐
缺氧水域
吸附
环境化学
富营养化
化学
营养物
磷
陆源沉积物
沉积物
煤
核化学
环境科学
弗伦德利希方程
活性炭
朗缪尔吸附模型
地质学
海洋学
有机化学
古生物学
作者
Satoshi Asaoka,Tamiji Yamamoto
标识
DOI:10.1016/j.marpolbul.2010.03.032
摘要
The deterioration of sediments is a serious environmental problem. Controlling nutrient release fluxes from sediments is important to alleviating eutrophication and to reducing terrigenous nutrient loads. The purpose of this study was to evaluate the phosphate removal performance of granulated coal ash (GCA) from seawater, which is produced from coal thermal electric power generation. Batch experiments were carried out to investigate the removal kinetics of phosphate from seawater under both oxic and anoxic conditions. Phosphate was removed well from seawater under both oxic and anoxic conditions. The adsorption isotherm for phosphate revealed that GCA could remove phosphate effectively from seawater above a concentration of 1.7micromolL(-1). GCA can reduce the concentration of phosphate in seawater effectively under anoxic conditions where iron type adsorbents cannot be applied. Therefore, GCA could potentially be used to adsorb phosphate in the organically-enriched sediment, which generally occurs under highly reductive conditions.
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