caa a22 4500 467953694 CHVBK 20180323165703.0 cr unu---uuuuu 170328e19880901xx s 000 0 eng 10.1007/BF01982919 doi (NATIONALLICENCE)springer-10.1007/BF01982919 (NATIONALLICENCE)springer-10.1007/BF00939324 Biological tertiary treatment of urban wastewaters with chitosan-immobilized Phormidium [Elektronische Daten] [Joël de la Noüe, Daniel Proulx] Summary: Chitosan:Phormidium aggregates (chitosan: algae=1:2, dry weight basis) were used as a biological tertiary treatment to remove the nitrogen (NH 4 + , NO 2 - , NO 3 - ) and phosphorus (PO 4 3- ) from a secondary effluent. In a batch system, 71 and 92% of P−PO 4 3- were removed after 6 and 24 h, respectively. The orthophosphate removal rate was identical for all three concentrations of algae-chitosan tested (3.3, 4.6, 5.9 g d. wt.·l-1), and was 90 μg±2 μg P−PO 4 3- ·l-1·h-1, for a 90% removal. Under control conditions (chitosan flakes only added to the effluent) 73 and 78% of PO 4 3- were removed after 6 and 24 h respectively. A 95% removal of inorganic nitrogen (NH 4 + , NO 2 - , NO 3 - ) was attained after 4-6 h withPhormidium immobilized on chitosan flakes, as compared to 30% with chitosan flakes alone (5 g d. wt.·l-1). The system gave a similar performance when operated semi-continuously over 5 days at a daily retention time of 1.0. In the presence of chitosan-immobilized algae, medium P−PO 4 3- levels were reduced by 87.3%±6.4% after 24 h (61.1 μg±7.0 μg P·l-1·h-1). The reduction of inorganic nitrogen in the medium was 98% after 24 h (370 μg±50 μg N·l-1·h-1). In the presence of chitosan alone, some 60% orthophosphate removal was recorded, whereas no reduction of nitrogen was observed. Disappearance of orthophosphate was attributed to its co-precipitation with calcium released from the chitosan by abrasion. The presence of the algae protected the chitosan from abrasion andPhormidium directly assimilated the orthophosphate and inorganic nitrogen, thus reducing their levels in the effluent. Springer-Verlag, 1988 de la Noüe Joël Groupe de Recherche en Recyclage Biologique et Aquiculture, Université Laval, G1K 7P4, Québec, Canada aut Proulx Daniel Groupe de Recherche en Recyclage Biologique et Aquiculture, Université Laval, G1K 7P4, Québec, Canada aut Applied Microbiology and Biotechnology Springer-Verlag 29/2-3(1988-09-01), 292-297 0175-7598 29:2-3<292 1988 29 253 https://doi.org/10.1007/BF01982919 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01982919 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- de la Noüe Joël Groupe de Recherche en Recyclage Biologique et Aquiculture, Université Laval, G1K 7P4, Québec, Canada aut NATIONALLICENCE 700 1- Proulx Daniel Groupe de Recherche en Recyclage Biologique et Aquiculture, Université Laval, G1K 7P4, Québec, Canada aut NATIONALLICENCE 773 0- Applied Microbiology and Biotechnology Springer-Verlag 29/2-3(1988-09-01), 292-297 0175-7598 29:2-3<292 1988 29 253 NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00939324 text/html Onlinezugriff via DOI Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE NATIONALLICENCE NL-springer