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Comparative Study on Start - Up Performance of HUASB and AF Reactors Treating Poultry Slaughterhouse Wastewater

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Astudywasperformed in Hybrid Upflow Anaerobic SludgeBlanket(HUASB) and Anaerobic Filter (AF) reactors to compare the start-up time and optimum HRT required for the treatment ofpoultryslaughterhouse wastewater under similar loading conditions. Initially, the reactors were started at an OLR of 0.77 Kg COD/mJ.d and HRT of36 h. Loading rates were increased by reducingHRT 24,16, 12,10and8hwhich corresponds theOLRofI.15, 1.74,2.27,2.74,3.43 KgCODI rnי.d.HUASBreactorshowed TCOD andSCODremoval efficiencies of80% and 86%,respectively at an optimum HRT of 10h whereasAFreactor showed 70%(TCOD) and 79%(SCOD) at optimum HRT of 12h. Reducing HRT beyond 10hin HUASB reactorshownsludgewash out and lower COD removal efficiencies ofless than80%and beyond 12h inAFmarkeddecreased efficiencies as lowas 66%.HUASB andAF reactors took 120, 147 respectively, for complete start-up. Thegranules 0[2-2.5 mmsizeswereobserved in HUASB and lessthan 1mmwere observed inAF withsettlingvelocities rangingbetween 0.5-0.83 mlmin and0.5-0.65m1min, respectively.FromResidence TimeDistribution studies, dispersion numbers «0.2) showed boththe reactors attainedplugflowregime. The present study revealed that the HUASB reactor has very good removal efficiency and less start-up time compared to that ofAF reactor for the treatmentof poultryslaughterhouse wastewater.

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