報告書番号

V07019

タイトル（和文）

脱硫石膏および石膏ボード廃棄物を用いた環境浄化材の合成法の開発（その３）－カラム吸着試験結果と乾燥下水汚泥の原料利用方法の検討－

タイトル（英文）

Development of the synthesis method of environmental purification materials using desulfurization gypsum and waste gypsum board (Part 3) -Column adsorption tests and synthesis method of hydroxyapatite using sewage sludge cakes-

概要 （図表や脚注は「報告書全文」に掲載しております）

水酸アパタイト系吸着材のカラム試験を実施し，吸着性能やその持続性を明らかにした。フッ素の吸着量は82-84mg/g,カドミウムの吸着量は82-84mg/g, 鉛の吸着量は430-440mg/gであった。フッ素に関しては開発品は骨炭よりも吸着量が多いことがわかった。下水汚泥ケーキから抽出したリンを原料に水酸アパタイトを合成した。リンの抽出量は前処理として分解酵素を用いると抽出量が増加した。合成した試料は，鉛，カドミウムに対して前報開発品と同程度の吸着性能を示した。

概要 （英文）

In our previous report, a new synthesis method of a environmental purification material (hydroxyapatite, HAP) using gypsum was developed, and the method was optimized for minimizing the irregularity of the quality. In this report, the adsorption capacities of HAPs are measured by clolumn experiments (1). The trial production of HAP are synthesized by using phosphorus extracted from sewage sludge cakes (SSC) (2).
(1) The adsorption capacities of the synthetic HAPs (by integrate the concentration of discharge which satisfy the environmental standard) are 2.6-3.2 mg/g for fluorine (F), 82-84 mg/g for cadmium (Cd), and 430-440 mg/g for lead (Pb). The capacity of synthetic HAPs for F are larger than that of charcoal boan (CB), and the capacities are nealy equal to that of CB for Cd, and Pb . The distribution coefficient (Kd) of HAPs are 2.4x10^3 - 2.8x10^3 ml/g for F, and 1.8x10^4 ml/g for Cd.
(2) The phosphorus concentration of extracted liquid from SSC are 1.4-1.7 g/L, these are much lower than that of sewage sludge ash (SSA) . The extraction rate of phosphorus are improved by adding the pretreatment process with enzymes (protease, cellulase). The adsorption abilities of synthetic HAPs for Cd and Pb are almost same as that of the HAP synthesized by SSA.

報告者

キーワード