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飲料水処理所の残留物から得られた吸着剤を用いて鉱山の酸排水から硫酸を除去する:合成,特徴付け,包括的な分析
Satish Chandra Bhuyan1, Pallavi Behera2, Himanshu Bhushan Sahu2
1Department of Mining Engineering, National Institute of Technology, Rourkela, 769008, India. 520MN6002@nitrkl.ac.in.
Environmental geochemistry and health
|August 21, 2025
まとめ
飲料水処理施設の残留物 (DWTPR) は,特にキトザンで改造された場合,酸性鉱山排水 (AMD) から硫酸と重金属を効果的に除去します. この持続可能なアプローチは鉱山の排水と浄水に役立ちます.
科学分野:
- 環境工学
- 水 の 処理
- 吸収科学
背景:
- 鉱山の酸性排水 (AMD) は,高い酸性と汚染物質の含有量により,重大な環境問題をもたらします.
- 従来のAMD治療法ではコストがかかり,二次廃棄物が発生します.
- 飲料水処理施設の残留物 (DWTPR) は,汚染物質の浄化の可能性のある豊富な廃棄物です.
研究 の 目的:
- 合成および実際のAMDから硫酸を除去する原始および改造されたDWTPRの有効性を調査する.
- EDTA改変とキトザン改変のDWTPRの性能を比較する.
- 物理化学的性質を分析し,硫酸除去パラメータを最適化する.
主な方法:
- SEM,EDS,XRD,FTIR,BET,およびpHZPCを用いた吸着剤の特徴づけ
- 硫酸除去実験は,初期濃度,用量,接触時間,pHを変化させることで実施された.
- 吸着イソサーム (ラングミュア) と運動 (擬似二次) モデリング,熱力学分析.
主要な成果:
- チトサンで改変されたDWTPRは,最適化条件下での最大硫酸除去 (77. 93%) を達成した (pH 7. 1, 5 g/100 mL用量,接触時間は300分).
- チトサン-DWTPRは,実際のAMDサンプルから (最大77. 93%),その他の汚染物質 (Fe, Mn, Cu, Ni, Al) から最大90%の硫酸を除去することが示されました.
- 吸い込みはラングミュア等温と偽二次運動に続いており,自発的,外熱的,低ランダム性のプロセスを示しています.
結論:
- チトサンの改変は,硫酸除去とAMD中和のためのDWTPRの吸収特性を著しく強化します.
- DWTPRは,特にキトザン改変型は,酸性鉱山排水処理のための実行可能で持続可能な吸着剤です.
- 吸附と化学的降水は,このプロセスにおける汚染物質の除去の鍵となるメカニズムです.
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