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Nutrient removal from slaughterhouse wastewater in an intermittently aerated sequencing batch reactor

Li, J.P., Healy, M.G., Zhan, X.M., Rodgers, M.
Bioresource technology 2008 v.99 no.16 pp. 7644-7650
aeration, air, ambient temperature, chemical oxygen demand, denitrification, effluents, nitrification, nitrogen, nitrogen balance, nitrogen content, phosphorus, slaughterhouses, wastewater
The performance of a 10L sequencing batch reactor (SBR) treating slaughterhouse wastewater was examined at ambient temperature. The influent wastewater comprised 4672±952mg chemical oxygen demand (COD)/L, 356±46mg total nitrogen (TN)/L and 29±10mg total phosphorus (TP)/L. The duration of a complete cycle was 8h and comprised four phases: fill (7min), react (393min), settle (30min) and draw/idle (50min). During the react phase, the reactor was intermittently aerated with an air supply of 0.8L/min four times at 50-min intervals, 50min each time. At an influent organic loading rate of 1.2g COD/(Ld), average effluent concentrations of COD, TN and TP were 150mg/L, 15mg/L and 0.8mg/L, respectively. This represented COD, TN and TP removals of 96%, 96% and 99%, respectively. Phase studies show that biological phosphorus uptake occurred in the first aeration period and nitrogen removal took place in the following reaction time by means of partial nitrification and denitrification. The nitrogen balance analysis indicates that denitrification and biomass synthesis contributed to 66% and 34% of TN removed, respectively.