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1997 Fiscal Year Final Research Report Summary

Separation of Algae on Water Purification

Research Project

Project/Area Number 07650643
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Civil and environmental engineering
Research InstitutionTOHOKU INSTITUTE OF TECHNOLOGY

Principal Investigator

KONNO Hiroshi  TOHOKU INSTITUTE OF TECHNOLOGY,Faculty of Engineering, Professor, 工学部, 教授 (40133053)

Project Period (FY) 1995 – 1997
Keywordscoagulation / coagulation blocking / algae / filtration / filter clogging / double layr filter / anthracite / soluble aluminium
Research Abstract

1.Coagulation of Alage and Its Blocking by Algae
The difference of the coagulation effect between alum and PAC of diatom using scanning electron microscope and energy diversive spectrometer are discussed by the strength of bridging action for coagulation. Freezed and dry method under Low Vaccum is useful to observe algae and the floc. In the stationary and endogeny phase of diatom, total organic substances and the ultara-violet rays absorbance substances are produced and its substances react aluminum injected as the coagulant. These are soluble aluminum, not suspended solid. The concentration of soluble aluminum changes the contact time with organic substances. The concentration of soluble aluminum decreses after reaching the piek value at some contact time. The concentration of piek value and the ratio of soluble aluminum concentration to the amount of aluminum injected are the minimum under the optimum dosage of coagulation of algae. The optimum coagulation process is important on eli … More mination of small size of alminum hydroxide.
2.Protection of Clogging of Rapid Sand Filter Caused by Diatom
Though the filtration efficiency of diatom such as Asterionella is high in case of combined type and large headloss occurs, the efficiency decreases after broken the formation of Asterionella. The ratio L/d, (L ; filter depth, d ; the filter grain size) is useful index to design the rational filter depth. The ratio means the number of thin layr having the depth with filter grain size. By the filtration experiment of diatom, anthracite-sand double layrs filter has high filtration efficiency on high removal rate, applicapability to wide ranges of length of diatom, deposit in thick filter layr and occurrence of small headloss. The headloss of filter decreases one half or third by setting the anthracite layr 10cm in depth, 1.4mm in effective size on sand layr with long filter run and stable water quality of filtrate. Surface washing sytem has high efficiency to thin anthracite layr such 5 to 10 cm in depth on renewing the filter. The experimental result that the 95 % of total deposit amount is depositted within 100 of L/d, ratio filter depth to grain size, under the condition within 50 of d/s, grain size to length of diatom, is applied to practical filter. Less

  • Research Products

    (13 results)

All Other

All Publications (13 results)

  • [Publications] 今野 弘・伊澤 信宏 他(今野): "針状珪藻の急速砂ろ過層内抑留に対する(3材径/珪藻長)比の影響" 環境工学研究論文集. 32. 1-8 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.KONNO, Sato, Magara(KONNO): "Characteristics of Deposit of Diatom in Filter and Effective Factors to Filter Clogging" Proc.of IWSA Specialized Conference. 103-108 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 今野 弘(同): "溶解性アルミニウムの生成に及ぼす藻類の増殖と塩素処理の影響" 用水と廃水. 38. 23-26 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] KONNO, Sata, Magara(KONNO): "Study on Influence of Length of Diatom and Filter Grain to Filter Clogging Problem in Rapid Sand Filtration Process for Drinking Water" Proc.of the 7th World Filtration Congress. 7. 243-247 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 今野 弘・紺野 栄二(今野): "針状珪藻によるろ過閉塞防止のための複層ろ過の合理的ろ層厚" 世界ろ過工学会日本会濾過分離シンポジウム論文集. 88-93 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 紺野 栄二・今野 弘(紺野): "針状珪藻による急速砂ろ過層の閉塞に対する複層ろ層の効果に関する研究" 環境工学研究論文集. 34. 371-379 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 佐藤 真柄、今野(分担執筆): "上水道における藻類障害" 技報堂出版(株), 155 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Konno, Izawa: "Influence of Ratio of Grain Size of Filter to Length of Slender Type Diatoms on Deposit in Rapid Sand Filter" Proc.of Environmental Engineering Research. vol.32. 1-8 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Konno, Sato, Magara: "Characteristics of Deposit of Diatom in Filter and Effective Factors to Filter Clogging" Proc.of IWSA Specialized Conference. 103-108 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Konno: "Influence of Chlorination and Proliferation of Algae to Formation of Soluble Aluminium" Water and Waste. Vol.38. 23-26 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Konno, Sato, Magara: "Study on Influence of Length of Diatom and Filter Grain to Filter Clogging Problem in Rapid Sand Filtration for Drinking Water" Proc.of The 7th World Filtration Congress. vol.7. 243-247 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Konno H and E.Konno: "Rational Depth of Double-Layr Filter Against Filter Clogging by Slender Type Diatom" Proc.of Filtration and Separation Symposium. 88-93 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Konno E.and H.Konno: "Effect of Double Layr Filter for Protection of Clogging of Rapid Sand Filter by Slender Type Diatoms" Proc.of Environmental Engineering Research. vol.34. 371-379 (1997)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-03-16  

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