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ID 34827
本文ファイル
著者
Sakohara, Shuji
Yagi, Seiichi
キーワード
Dewatering
Inorganic sludge
Thermosensitive polymer
Hydrophobic interaction
Dual ionic polymers
Polymer complex
NDC
化学工業
抄録(英)
The dewatering of inorganic sludge by a novel method based on the hydrophilic/hydrophobic transition of ionic thermosensitive polymers was investigated. As an inorganic sludge, the drinking water treatment sludge was used. Cationic thermosensitive polymers, poly(NIPAM-co-DMAPAA), which were synthesized by copolymerizing N,N-dimethylaminopropylacrylamide (DMAPAA) as the cationic component with N-isopropylacrylamide (NIPAM) as the thermosensitive component, were effective in dewatering the sludge. When the dewatering was performed at room temperature, the optimum polymer dosage for the dewatering rate was observed similar to the conventional hydrophilic polymeric flocculants. On the other hand, when the dewatering was carried out above the lower critical solution temperature (LCST) of poly(NIPAM-co-DMAPAA), the dewatering rate increased remarkably as the polymer dosage increased. Such high dewatering rates can be attributed to the hydrophobic interaction among the thermosensitive polymer molecules adsorbed on the sludge. However, the LCST of poly(NIPAM-co-DMAPAA) increased considerably as the DMAPAA content increased. In order to solve this problem, the use of dual ionic thermosensitive polymers was investigated. By using the anionic thermosensitive polymer, poly (NIPAM-co-AAC), which was synthesized by copolymerizing acrylic acid (MC) with NIPAM, in combination with cationic poly(NIPAM-co-DMAPAA), the dewatering rate was remarkably increased at relatively low temperatures. This increase was attributed to the formation of a polymer complex that decreased the LCST of the polymer molecules adsorbed on the sludge.
掲載誌名
Separation and Purification Technology
80巻
1号
開始ページ
148
終了ページ
154
出版年月日
2011
出版者
Elsevier Science BV
ISSN
1383-5866
NCID
出版者DOI
言語
英語
NII資源タイプ
学術雑誌論文
広大資料タイプ
学術雑誌論文
DCMIタイプ
text
フォーマット
application/pdf
著者版フラグ
author
権利情報
(c) 2011 Elsevier B.V. All rights reserved.
関連情報URL
部局名
工学研究科