| dc.description.abstract | The discharge of nitrate-rich effluent has adverse effect on the receiving environment and the public health of the
polluted water users. The nitrates are eliminated in a denitrification step that requires reducing power in form of
organic carbon. The objective of this study was to evaluate the potential of utilizing organic carbon in effluent from
the anaerobic SBR as a carbon source for denitrification. Reactors were operated for one year using meat
processing wastewater. Anaerobically treated abattoir wastewater equivalent to 5, 10 and 15% of aerobic SBR
hydraulic volume were added to three separate reactors. A 12 h operating cycle consisted of the following periods:
(a) filling, 0.30 h; (b) settling, 11 h and (d) decanting, 0.30 h for the anoxic reactor. A comparison between different
carbon loads was performed based on biological carbon, nitrogen and phosphorus removal. Sufficient denitrification
was achieved with 10% (aerobic SBR hydraulic volume) of anaerobically-treated abattoir wastewater. TCOD, BOD5,
TKN, N02
-N, NO3
-N, PO4
3-, TS, EC and temperature and turbidity were reduced by 78, 70, 91, 100, 98, 62, 39, 65,
71, 5 and 39% respectively, with effluent mean concentrations of 80 ± 5 mg/L, 54 ± 12 mg/L, 35 ± 4, 00 ± 0, 2 ± 1, 18
± 1, 254 ± 12, 1.64 ± 0.01, 22.04 ± 0.02 and 738 ± 9 FAU. Organic carbon in effluent from the anaerobic SBR can be
used as a carbon source for anoxic denitrification. However, the denitrification rate is affected by the organic carbon
load used. Except TKN and o-PO43- mg/L, all other parameters in the denitrified effluent met discharge standards. | en_US |
