Advanced oxidation process-biological system for wastewater containing a recalcitrant pollutant.
Two advanced oxidation processes (AOPs), ozonation and photo-Fenton, combined with a pilot aerobic biological reactor at field scale were employed for the treatment of industrial non-biodegradable saline wastewater (TOC around 200 mgL(-1)) containing a biorecalcitrant compound, alpha-methylphenylglycine (MPG), at a concentration of 500 mgL(-1). Ozonation experiments were performed in a 50-L reactor with constant inlet ozone of 21.9 g m(-3). Solar photo-Fenton tests were carried out in a 75-L pilot plant made up of four compound parabolic collector (CPC) units. The catalyst concentration employed in this system was 20 mgL(-1) of Fe2+ and the H2O2 concentration was kept in the range of 200-500mgL(-1). Complete degradation of MPG was attained after 1,020 min of ozone treatment, while only 195 min were required for photo-Fenton. Samples from different stages of both AOPs were taken for Zahn-Wellens biocompatibility tests. Biodegradability enhancement of the industrial saline wastewater was confirmed (>70% biodegradability). Biodegradable compounds generated during the preliminary oxidative processes were biologically mineralised in a 170-L aerobic immobilised biomass reactor (IBR). The global efficiency of both AOP/biological combined systems was 90% removal of an initial TOC of over 500 mgL(-1).
Plataforma Solar de Almería-CIEMAT, Carretera Senés Km 4, 04200 Tabernas (Almería), Spain. isabel.oller@psa.es
I
I
Oller
S
S
Malato
J A
JA
Sánchez-Pérez
M I
MI
Maldonado
W
W
Gernjak
L A
LA
Pérez-Estrada
D005998:Glycine / Q000031:analogs & derivatives* / Q000737:chemistry / Q000378:metabolism; D006861:Hydrogen Peroxide / Q000737:chemistry; D007501:Iron / Q000737:chemistry; D015394:Molecular Structure; D010084:Oxidation-Reduction; D010126:Ozone / Q000737:chemistry; D013438:Sulfhydryl Compounds / Q000737:chemistry* / Q000378:metabolism*; D014873:Water Pollutants / Q000737:chemistry* / Q000378:metabolism*; D018508:Water Purification / Q000379:methods*
C045076:Fenton's reagent; C110658:N-(2-mercaptoproprionyl)-glycine; D013438:Sulfhydryl Compounds; D014873:Water Pollutants; D010126:Ozone; D006861:Hydrogen Peroxide; D007501:Iron; D005998:Glycine