title: Incorporation of hydrophobized mineral particles in activated sludge flocs: a way to assess ballasting efficiency.
abstract: The role of mineral surface hydrophobicity in attachment to activated sludge flocs was investigated. Fluorite and quartz particles of similar granulometry were hydrophobized by adsorbing sodium oleate and dodecylamine chloride, respectively. Mineral hydrophobicity was assessed by flotation expriments. The attachment of particles to microbial flocs was determined by optical microscopy. The results indicate that hydrophobized particles are always better incorporated within activated sludge flocs than non-coated particles. A comparison with Aquatal particles used as sludge ballast reveals that hydrophobized minerals are associated with microbial flocs to the same extent.
authors.affiliation: LEM-INPL-CNRS/University of Nancy, 15 Avenue du Charmois, BP 40, 54501 Vandoeuvre Cedex, France.
authors.forename: G
authors.initials: G
authors.lastname: Defontaine
authors.forename: J
authors.initials: J
authors.lastname: Thormann
authors.forename: B S
authors.initials: BS
authors.lastname: Lartiges
authors.forename: A G
authors.initials: AG
authors.lastname: El Samrani
authors.forename: O
authors.initials: O
authors.lastname: Barrs
mesh_terms: D000327:Adsorption; D000588:Amines / Q000737:chemistry; D002124:Calcium Fluoride / Q000737:chemistry; D002712:Chlorides / Q000737:chemistry; D005427:Flocculation; D057927:Hydrophobic and Hydrophilic Interactions; D018613:Microscopy, Confocal; D008903:Minerals / Q000737:chemistry*; D019301:Oleic Acid / Q000737:chemistry; D010316:Particle Size; D011791:Quartz / Q000737:chemistry; D012722:Sewage / Q000737:chemistry*; D012995:Solubility; D013997:Time Factors; D014871:Water Microbiology; D018508:Water Purification / Q000379:methods*
chemical_list: D000588:Amines; D002712:Chlorides; D008903:Minerals; D012722:Sewage; D011791:Quartz; D019301:Oleic Acid; C013173:osteum; D002124:Calcium Fluoride; C003935:dodecylamine