The efficacy of ozone as a pre- and post-treatment option for UASB-treated food processing wastewaters

• Published in: Water science and technology 2005-01, Vol.52 (1-2), p.167-173
• Main Authors: Sigge, G O, Britz, T J, Fourie, P C, Barnardt, C A
• Format: Article
• Language: English
• Subjects: Alkalinity; Anaerobiosis; Bacteria, Anaerobic - metabolism; Biodegradation, Environmental; Biogas; Bioreactors - microbiology; Canning; Canning industry wastewaters; Efficiency; Effluents; Fatty acids; Fatty Acids, Volatile - metabolism; Food; Food industries wastewaters; Food processing; Food-Processing Industry; Fruits; Industrial Waste; Investigations; Laboratories; Load distribution; Loading rate; Methane - metabolism; Organic loading; Oxidants, Photochemical - chemistry; Oxygen - metabolism; Ozonation; Ozone; Ozone - chemistry; Ozonization; Prunus; Reactors; Removal; Sedimentation & deposition; Sensors; Sewage - microbiology; South Africa; Waste Disposal, Fluid - methods; Wastewater; Wastewater treatment; Water Purification - methods; Wine; Wineries; Wineries & vineyards
• ISSN: 0273-1223; 1996-9732
• DOI: 10.2166/wst.2005.0513

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.