Treatment of hatchery wastewater by a sequencing batch reactor process |
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| Authors: | K V Lo P H Liao |
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| Institution: | Department of Bio-Resource Engineering, University of British Columbia, Vancouver, BC V6T 1Z4, Canada |
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| Abstract: | After settling pretreatment, the primary sludge wastewaters from a fish hatchery were treated in three five-litre bench-scale sequencing batch reactors. The sequencing batch reactors were operated concurrently under the same operating conditions. A cycle of 24 hours was adopted during the course of this study. Two different temperature regimes (22°C and 10°C) were employed, and a range of initial BOD5 concentrations was treated. The results showed the occurrence of very high reductions in BOD5 and COD concentrations, and very high removal of ammonia---nitrogen and suspended solids. The average five-day BOD5 reduction was 98% for high influent concentrations, while the reduction for lower influent concentrations was 95%. The average five-day BOD5 concentration for the effluents was less than 100 mg litre?1. Nitrification was pronounced after 40 days of reactor operation. Denitrification occurred when the reactors were fed wastewaters with high BOD5 concentrations, although it was not observed with low influent BOD5 concentrations or at low temperatures (10°C). The overall treatment efficiency remained very high when the reactors were operated under a low temperature regime (10°C). |
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