The production of canned maize is accompanied by
formation of large volumes of waste water, with high
contents of starch, and high chemical- and biochemical
oxygen demand. In our work the effects of acidic, micro-
wave and ozone pretreatment on the biogas production and
aerobic biodegradability of canned maize production sludge
were examined and the energy balance of the processes were
determined when different sludge pretreatments were used.
It was found that ozone treatment decreased the chemical
oxygen demand, while the biochemical oxygen demand and
the aerobic biodegradability increased. The combination of
microwave and ozone treatment increased the biodegrad-
ability relative to ozone treatment alone
