Go. Sigge et al., Use of ozone and hydrogen peroxide in the post-treatment of UASB treated alkaline fruit cannery effluent, WATER SCI T, 44(5), 2001, pp. 69-74
UASB treatment of cannery effluents was shown to be feasible. However, the
treated effluent still does not allow direct discharge to a water system an
d a further form of post-treatment is necessary to reduce the COD to lower
than the legal limit of 75 mg/l. The use of ozone, hydrogen peroxide and gr
anular activated carbon were used singly or in combination to assess the ef
fectiveness as post-treatment options for the UASB treated alkaline fruit c
annery effluent. Colour reduction in the effluent ranged from 15% to 92% an
d COD reductions of 26-91% were achieved. Combinations of ozone and hydroge
n peroxide gave better results than either oxidant singly. The best results
were achieved by combining ozone, hydrogen peroxide and granular activated
carbon, and COD levels were reduced to levels sufficiently below the 75 mg
/l limit.