title: Combined anaerobic-aerobic and UV/H2O2 processes for the treatment of synthetic slaughterhouse wastewater.
abstract: The biological treatment of a synthetic slaughterhouse wastewater (SSWW) is studied using an anaerobic baffled bioreactor (ABR) and an aerobic activated sludge (AS) at a laboratory scale in continuous mode. The total organic carbon (TOC) loading rate, the total nitrogen (TN) loading rate, and the flow rate are 0.03-1.01 g/(L.day), 0.01-0.19 g/(L.day), and 2.93-11.70 mL/min, respectively. The results reveal that combined anaerobic-aerobic processes had higher efficiency to treat SSWW than a single process. Up to 96.36% TOC, 80.53% TN, and 99.38% 5-day carbonaceous biochemical oxygen demand (CBOD5) removal from an influent concentration of 1,009 mgTOC/L, 420 mgTN/L, and 640 mgCBOD5/L at the hydraulic retention time (HRT) of 6.24 days and a flow rate of 3.75 mL/min are achieved. The UV/H2O2 process is studied to treat a secondary effluent of SSWW with TOC loadings of 65-350 mg/L. Up to 75.22% TOC and 84.38% CBOD5 removal are obtained at the HRT of 3 h with H2O2 concentration of 900 mg/L. Optimum molar ratios of 13.87 mgH2O2/mgTOCin and 4.62 mgH2O2/mgTOCin.h are also obtained. Combined anaerobic-aerobic and UV/H2O2 processes enhanced the biodegradability of the TOC, TN, and CBOD5 present in the SSWW. Up to 99.98% TOC, 82.84% TN, and 99.69% CBOD5 overall removals are obtained for an influent concentration of 1,005 mgTOC/L, 200 mgTN/L, and 640 mgCBOD5/L at the HRT of 4 days and a flow-rate of 5.90 mL/min.
authors.affiliation: Environmental Applied Science and Management Graduate Program, Ryerson University, Toronto, Ontario, Canada.
authors.forename: Ciro Fernando
authors.initials: CF
authors.lastname: Bustillo-Lecompte
authors.forename: Mehrab
authors.initials: M
authors.lastname: Mehrvar
authors.forename: Edgar
authors.initials: E
authors.lastname: Quiñones-Bolaños
mesh_terms: D000003:Abattoirs; D000332:Aerobiosis; D000693:Anaerobiosis; D001673:Biodegradation, Environmental; D019149:Bioreactors; D002244:Carbon / Q000378:metabolism; D058440:Denitrification; D006861:Hydrogen Peroxide / Q000737:chemistry; D058465:Nitrification; D009584:Nitrogen / Q000378:metabolism; D010100:Oxygen / Q000378:metabolism; D014466:Ultraviolet Rays; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater / Q000737:chemistry*
chemical_list: D002244:Carbon; D006861:Hydrogen Peroxide; D009584:Nitrogen; D010100:Oxygen; D062065:Wastewater