A new simple equation for the prediction of filter expansion during backwashing

Soyer E., AKGİRAY Ö.

JOURNAL OF WATER SUPPLY RESEARCH AND TECHNOLOGY-AQUA, cilt.58, sa.5, ss.336-345, 2009 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 58 Sayı: 5
  • Basım Tarihi: 2009
  • Doi Numarası: 10.2166/aqua.2009.090
  • Dergi Adı: JOURNAL OF WATER SUPPLY RESEARCH AND TECHNOLOGY-AQUA
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.336-345
  • Anahtar Kelimeler: backwash, filter media, fluidization, particle shape, sphericity, water treatment, SOLID-LIQUID SYSTEMS, FLUIDIZATION, VOIDAGE, MEDIA
  • Marmara Üniversitesi Adresli: Evet

Özet

Fluidization experiments have been carried out with glass spheres, plastic spheres and several sieved fractions of silica sand, garnet sand, perlite and crushed glass. The effect of particle shape on expansion behavior is investigated. Sphericity as determined using the Ergun equation and fixed-bed head loss data is employed to quantify the shape effect. It is found that the influence of particle shape depends on the Reynolds number based on backwash velocity. A new equation that accounts for particle shape is proposed. For the materials studied, the proposed equation gives excellent agreement with both the spherical and the non-spherical particle data.