title: High-rate wastewater treatment combining a moving bed biofilm reactor and enhanced particle separation.
abstract: Many cities around the world are looking for compact wastewater treatment alternatives since space for treatment plants is becoming scarce. In this paper development of a new compact, high-rate treatment concept with results from experiments in lab-scale and pilot-scale are presented. The idea behind the treatment concept is that coagulation/floc separation may be used to separate suspended and colloidal matter (resulting in > 70% organic matter removal in normal wastewater) while a high-rate biofilm process (based on Moving Bed biofilm reactors) may be used for removing low molecular weight, easily biodegradable, soluble organic matter. By using flotation for floc/biomass separation, the total residence time for a plant according to this concept will normally be < 1 hour. A cationic polymer combined with iron is used as coagulant at low dosages (i.e. 1-2 mg polymer/l, 5-10 mg Fe/l) resulting in low sludge production (compared to conventional chemical treatment) and sufficient P-removal.
authors.affiliation: Department of Water and Environment, SINTEF, N-7465 Trondheim, Norway.
authors.forename: H
authors.initials: H
authors.lastname: Helness
authors.forename: E
authors.initials: E
authors.lastname: Melin
authors.forename: Y
authors.initials: Y
authors.lastname: Ulgenes
authors.forename: P
authors.initials: P
authors.lastname: Järvinen
authors.forename: V
authors.initials: V
authors.lastname: Rasmussen
authors.forename: H
authors.initials: H
authors.lastname: Odegaard
mesh_terms: D018441:Biofilms; D019149:Bioreactors; D002617:Chemical Industry; D003102:Colloids / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism; D005427:Flocculation; D007220:Industrial Waste; D007501:Iron / Q000737:chemistry / Q000494:pharmacology; D008970:Molecular Weight; D010100:Oxygen / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism; D010316:Particle Size; D010539:Permeability; D012722:Sewage / Q000737:chemistry / Q000382:microbiology*; D013997:Time Factors; D014865:Waste Disposal, Fluid / Q000379:methods*
chemical_list: D003102:Colloids; D007220:Industrial Waste; D012722:Sewage; D007501:Iron; D010100:Oxygen