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Development of dewatering system for activated sludge by using novel thermosensitive porous hydrogels

Research Project

Project/Area Number 09650845
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 反応・分離工学
Research InstitutionHIROSHIMA UNIVERSITY

Principal Investigator

SAKOHARA Shuji  Hiroshima University, Department of Chemical Engineering, Professor, 工学部, 教授 (80108232)

Co-Investigator(Kenkyū-buntansha) GOTOH Takehiko  Hiroshima University, Department of Chemical Engineering, Assistant Professor, 工学部, 助手 (10274127)
Project Period (FY) 1997 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 1998: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1997: ¥2,700,000 (Direct Cost: ¥2,700,000)
KeywordsThermosensitive Gel / N.N-diethylacrylamide / N-isopropylacrylamide / Porous Gel / Pore Size Distribution / Swelling Rate / Activated Sludge / Dewatering / ジエチルアクリルアミド / 剪断弾性率 / イソプロピルアクリルアミド / 転移温度 / 脱水システム / 収縮速度
Research Abstract

Preparation method of novel thermosensitive porous gels utilizing unique thermosensitive properties of acrylamide derivative polymers and development of dewatering system by using such thermosensitive hydrogels were investigated.
1. Novel synthesis of thermosensitive porous gels N,N-diethylacrylamide (DEAA) and N-isopropylacrylamide (NIPAM) were used as primary monomers. These monomers dissolve in water, while their polymers have the transition temperature of about 32゚C and 31゚C, respectively. In other words, these polymers dissolve in water below these temperatures, while they have hydrophobic properties above these temperatures. The porous gels could be synthesized easily by a radical copolymerization of one of these primary monomers and cross-linker. The structures F could be controlled by the synthesis temperature, the concentration of cross-linker and so on. The porous structures composed of microgel particles of several microns and macro pores were formed clearly at the synthesis … More temperature above 40゚C, and the size of gel particles decreased with increasing the cross-linker concentration.
2. Swelling and shrinking behaviors The porous gels synthesized above 40゚C swelled or shrank very fast without deformation because of the small resistance for permeation of water. The swelling rate of these porous gels was larger several hundred times compared with non-porous gels, and was inversely proportional to the square of the characteristic length of gel. The shrinking rate was comparable to the heat transfer rate.
3. Dewatering tests of organic wastewater discharged from a rice washing machine The wastewater of 400mL containing organic materials of about 70000 ppm (the initial water content was about 93%) was dewatered by using the porous gels of 100 pieces which were synthesized at 50゚C.The size of gel was 3.5 mm. The gels shrank at 50゚C immersed into the waste water at 10゚C for 15-30min. The water content could be decreased easily to less than 70% by repeating these procedures 5 times.
4. Conclusion By selecting the synthesis condition of thermosensitive porous gels, the dewatering of the organic wastewater by using these porous gels proposed in this research could be attained. The further study for practical application will be needed. Less

Report

(3 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] Takehiko Gotoh: "A Novel Synthesis of Thermo-sensitive Porous Hydrogels" Journal of Applied Polymer Science. 69. 895-906 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Takehiko Gotoh: "Newly developed thermorespnsive porous gels and its application to dewatering process" Recent Research and Development in Macromolecule Research. 3. 77-87 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 後藤健彦: "スポンジ状感温性ゲル -工業的分離媒体への応用を目指した簡便な合成法-" 高分子加工. 46. 554-560 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Takehiko Gotoh: "A Novel Synthesis of Thermo-sensitive Porous Hydrogels" Journal of Applied Polymer Science. 69. 895-906 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Takehiko Gotoh: "Newly developed thermoresponsive porous gels and its application to dewatering process" Recent Research and Development in Macromolecule Research. 3. 77-87 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Takehiko Gotoh: "Sponge-like Thermosensitive Gels-Development of simple preparation method for application to industrial separation medium-" Polymer Applications. 46. 554-560 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Takehiko Gotoh: "A Novel Synthesis of Thermo-sensitive Porous Hydrogels" Journal of Applied Polymer Science. 69. 895-906 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Takehiko Gotoh: "Newly developed thermorespnsive porous gels and its application to dewatering process" Recent Research and Development in Macromolecule Research. 3. 77-87 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Takehiko Gotoh: "A Novel Synthesis of Thermo-sensitive Porous Hydrogels" Journal of Applied Polymer Science. (印刷中). (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] 後藤健彦: "スポンジ状感温性ゲル-工業的分離媒体への応用を目指した簡便な合成法-" 高分子加工. 46・12. 554-560 (1997)

    • Related Report
      1997 Annual Research Report

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Published: 1997-04-01   Modified: 2016-04-21  

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