Synthetic sludge: A physical/chemical model in understanding bioflocculation

Sanin F. D., Vesilind P.

WATER ENVIRONMENT RESEARCH, cilt.68, sa.5, ss.927-933, 1996 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 68 Sayı: 5
  • Basım Tarihi: 1996
  • Doi Numarası: 10.2175/106143096x127938
  • Dergi Adı: WATER ENVIRONMENT RESEARCH
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.927-933
  • Anahtar Kelimeler: alginate, sludge, bioflocculation, calcium, extracellular polymers, ACTIVATED-SLUDGE, FLOCCULATION, POLYMERS
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

We postulate a mechanism for flee formation and demonstrate its feasibility by building synthetic sludge flocs. In this work, polystyrene latex particles of a size similar to bacteria are used to simulate individual bacteria; alginate, a polysaccharide, is used to simulate microbial extracellular polymers; and calcium ions are used as the bridging cations. Calcium and alginate are added at typical concentration ranges relative to the amount of microorganisms existing iii wastewater treatment biological sludges. Flocs are formed almost instantly by the addition of calcium ions and are observed to be remarkably similar to the activated sludge flocs in physical appearance. Roc formation is faster at higher calcium concentrations. Higher alginate and calcium concentrations always ensure lower turbidities indicating better flee forming abilities.