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Anwendung von Polyelektrolyten bei der mechanischen Fest/Flüssig‐Trennung
Author(s) -
Kulicke WernerMichael,
Lenk Sylvia,
Detzner HeinzDieter,
Weiß Thomas
Publication year - 1993
Publication title -
chemie ingenieur technik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.365
H-Index - 36
eISSN - 1522-2640
pISSN - 0009-286X
DOI - 10.1002/cite.330650507
Subject(s) - polyelectrolyte , flocculation , dewatering , chemistry , chemical engineering , chromatography , materials science , organic chemistry , polymer , engineering , geotechnical engineering
Use of Polyelectrolytes in Mechanical Solids/Liquid Separation. This article shows how optimisation tasks for the dewatering of sludge can be solved by starting from studies of chemical structure and steric properties of polyelectrolytes and laboratory experiments based thereon with a trans‐portable computer‐aided flocculation and dewatering apparatus. The optimum polyelectrolyte dosage lies in the range of the critical concentration c * (viscosimetric measurements) of the dissolved polyelectrolytes. On optimisation of the flocculant regime for mechanical solids/liquid separation by combined addition of anionic and cationic polyelectrolytes (dual process), it is necessary to consider the overall system of sedimentation and filtration. In an industrial scale plant, the consumption of flocculant could be reduced by up to 10% compared to laboratory studies. At the same time, the dewatering behaviour could be improved by up to 60%, a shearing strength of the sludge in excess of 20 kN/m 2 reliably established, and plant operating reliability achieved for changing sedimentation properties.