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. 1–2mg polymer/l, 5–10mg Fe/l) resulting in low sludge production (compared to conventional chemical treatment) and sufficient P-removal.
High-rate wastewater treatment combining a moving bed biofilm reactor and enhanced particle separation
H. Helness, E. Melin, Y. Ulgenes, P. Järvinen, V. Rasmussen, H. Ødegaard; High-rate wastewater treatment combining a moving bed biofilm reactor and enhanced particle separation. Water Sci Technol 1 November 2005; 52 (10-11): 117–127. doi: https://doi.org/10.2166/wst.2005.0685
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