トピックアウトライン

  • 一般

    すべてを折りたたむ すべてを展開する
    • URL アイコン
      Japanese URL

    • Professor Seki retired from Hokkaido University in March, 2024.

  • Typical evaluation method

    • Nephelometry :Clarity of supernatant

      sedimentation balance method: Sedimentation velocity of aggregates

  • Nephelometry

    • 凝集剤flocculant, 懸濁液suspension, 沈降管に移すtransfering to sedimentation tube, 静置Stand still, 試料採取sampling, 濁度測定Turbidity measurement

      カオリン(白陶土)kaolin,吸光度absorbance



    • 添加過剰Excess addition　凝集剤の添加量Addition amount of flocculant

      凝集剤を添加しないときの濁度Turbidity without addition of flocculant

  • sedimentation balance method

    • 電子天秤electronic balance　

      沈降距離sedimentation distance

















    • 凝集剤flocculant　懸濁液suspension　沈降管に移すtransfer to sedimentation tube　トラップに沈降する粒子重量を測定Measures the weight of particles settling in the trap

    • Experimental results of sedimentation balance method (salt concentration and sedimentation velocity)

      傾き「急」Inclination "steep"　沈降「速」Sedimentation "fast"　粒径「大」Particle size "Large"　淡水fresh water　海水sea water

    • Sedimentation balance analysis method

      時間time

    • 時間で微分Differentiate with time



  • Practical example: Ultra-high-speed coagulation-sedimentation equipment

    • pH調整剤pH adjuster　凝集剤flocculant　急速撹拌rapid stirring　凝集槽Aggregation tank　緩慢撹拌slow stirring　沈降槽Sedimentation tank　凝集物の処理は？How to deal with agglomerates?

  • Application example: belt press