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

Author:

Sigge G.O.1,Britz T.J.1,Fourie P.C.2,Barnardt C.A.3

Affiliation:

1. Department of Food Science, University of Stellenbosch, Private Bag X1, Matieland, 7602, South Africa

2. ARC Infruitec-Nietvoorbij, Private Bag X5013, Stellenbosch, 7599, South Africa

3. Enviro Services, P.O. Box 3087, Somerset West, 7129, South Africa

Abstract

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.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.

Publisher

IWA Publishing

Subject

Water Science and Technology,Environmental Engineering

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