Characteristics of phosphate adsorption onto granulated coal ash in seawater

被引：40

作者：

Asaoka, Satoshi ^{[1
]}

Yamamoto, Tamiji ^{[1
]}

机构：

[1] Hiroshima Univ, Grad Sch Biosphere Sci, Higashihiroshima 7398528, Japan

来源：

MARINE POLLUTION BULLETIN | 2010年 / 60卷 / 08期

关键词：

Adsorption; Calcium phosphate; Coal ash; Eutrophication; Phosphate; Sediment; BLAST-FURNACE SLAG; AQUEOUS-SOLUTION; REMOVAL; SEDIMENTS; SORPTION; ACID;

D O I：

10.1016/j.marpolbul.2010.03.032

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

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 1.7 mu mol L-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. (C) 2010 Elsevier Ltd. All rights reserved.

引用

页码：1188 / 1192

页数：5

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