The efficacy of ozone as a pre- and post-treatment option for UASB-treated food processing wastewaters.
The efficiency of ozone as a pre- and post-treatment to UASB treatment was investigated, followed by a study into UASB reactor performance with ozonated wastewater as substrate. Combinations of pre- and/or post-ozonation with UASB treatment gave better results than ozonation or UASB alone and COD reductions of 53.0-98.9% were achieved for treatment of canning and winery wastewaters. A UASB reactor was fed with pre-ozonated cannery wastewater for over 70 d. COD removal improved from between 58.8 and 64.4% to between 85.3 and 91.8% after pre-ozonated substrate feed commenced. Subsequent increases in organic loading rate (OLR) from 2.4 to 3.4 kgCOD m(-3) x d(-1) did not affect reactor performance. By including a final post-ozonation treatment to this UASB effluent a total COD reduction of 99.2% was achieved.
Sigge
G O
GO
Department of Food Science, University of Stellenbosch, Private Bag Xl, Matieland, 7602, South Africa. gos@sun.ac.za
Britz
T J
TJ
Fourie
P C
PC
Barnardt
C A
CA
D000693:Anaerobiosis; D001421:Bacteria, Anaerobic / Q000378:metabolism; D001673:Biodegradation, Environmental; D019149:Bioreactors / Q000382:microbiology*; D005232:Fatty Acids, Volatile / Q000378:metabolism; D005525:Food-Processing Industry; D007220:Industrial Waste; D008697:Methane / Q000378:metabolism; D010083:Oxidants, Photochemical / Q000737:chemistry*; D010100:Oxygen / Q000378:metabolism; D010126:Ozone / Q000737:chemistry*; D027861:Prunus; D012722:Sewage / Q000382:microbiology; D013019:South Africa; D014865:Waste Disposal, Fluid / Q000379:methods*; D018508:Water Purification / Q000379:methods; D014920:Wine
D005232:Fatty Acids, Volatile; D007220:Industrial Waste; D010083:Oxidants, Photochemical; D012722:Sewage; D010126:Ozone; D008697:Methane; D010100:Oxygen