UASB treatment of fruit cannery and winery effluents was shown to be feasible. However, the treated effluents still have residual COD levels well above the legal limit of 75 mg.L−1 for direct discharge to a water system and a form of post-treatment is necessary to reduce the COD further. Ozone and ozone/hydrogen peroxide were used in combination with a granular activated carbon contacting column to assess the effectiveness as a post-treatment option for the UASB treated fruit cannery and winery effluent. Colour reduction in the effluents ranged from 66 to 90% and COD reductions of 27–55% were achieved. The combination of ozone and hydrogen peroxide gave better results than ozonation alone. Significant progress was thus made in achieving the legal limit of 75 mg.L−1.
Combining UASB technology and advanced oxidation processes (AOPs) to treat food processing wastewaters
G.O. Sigge, T.J. Britz, P.C. Fourie, C.A. Barnardt, R. Strydom; Combining UASB technology and advanced oxidation processes (AOPs) to treat food processing wastewaters. Water Sci Technol 1 May 2002; 45 (10): 329–334. doi: https://doi.org/10.2166/wst.2002.0365
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