Removal of phosphorus from wastewaters by biomass ashes.
Removal batch assays of phosphates from a synthetic wastewater (SWW) and a pulp and paper mill wastewater (PPWW) with two forestry biomass ashes were performed. The supernatants were not only chemically characterized but also the ecotoxicity was determined using two organisms: Vibrio fischeri and Artemia franciscana. The addition of fly ash and bottom ash to the SWW in solid/liquid (S/L) ratios of 3.35 and 9.05 g L(-1), respectively, achieved removal percentages of phosphates >97% for both ashes. The addition of fly ash and bottom ash to the PPWW in S/L ratios of 34.45 and 46.59 g L(-1), respectively, yield removal percentages of phosphates >90% for both ashes. According to the results of the Langmuir and Freundlich isotherms, the removal of phosphates from the SWW was mainly explained by surface removal mechanisms, while the removal from the PPWW was partially explained by multi-layer mechanisms. The supernatants resulting from the treatment of SWW and PPWW with both biomass ashes did not present acute ecotoxicity.
Faculdade de Ciências e Tecnologia, Department of Sciences and Technology of Biomass, Universidade Nova de Lisboa, Campus da Caparica, Edifício Departamental, Piso 3, gab. 364, 2829-516 Monte da Caparica, Portugal E-mail: ncsn@fct.unl.pt.
R
R
Barbosa
N
N
Lapa
H
H
Lopes
A
A
Morujo
B
B
Mendes
D048908:Aliivibrio fischeri / Q000187:drug effects; D000818:Animals; D001156:Artemia / Q000187:drug effects; D001870:Book Industry; D060729:Coal Ash / Q000378:metabolism / Q000633:toxicity*; D016468:Forestry; D010209:Paper; D010710:Phosphates / Q000737:chemistry / Q000378:metabolism*; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater / Q000032:analysis / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000378:metabolism*
D060729:Coal Ash; D010710:Phosphates; D062065:Wastewater; D014874:Water Pollutants, Chemical