Evaluation of the Bio-Kinetics of Cement Kiln Dust In An Upflow Anaerobic Sludge Blanket Reactor for Treatment of Palm Oil Mill Effluent As A Function of Hydraulic Retention Time
In this paper we operated an upflow anaerobic sludge blanket reactor (UASBR) continuously at 35 °C in order to observe the effects of varying the hydraulic retention time (HRT) from 3.5 to 34.5 d and varying the organic loading rate (OLR) from 1.5 to 46 kg COD m−3 d−1. The pH of the digester improve...
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2014
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| Subjects: | |
| Online Access: | http://umpir.ump.edu.my/id/eprint/7383/ http://umpir.ump.edu.my/id/eprint/7383/ http://umpir.ump.edu.my/id/eprint/7383/ http://umpir.ump.edu.my/id/eprint/7383/1/Evaluation%20Of%20The%20Bio-Kinetics%20Of%20Cement%20Kiln%20Dust%20In%20An%20Upflow%20Anaerobic%20Sludge%20Blanket%20Reactor%20For%20Treatment%20Of%20Palm%20Oil%20Mill%20Effluent%20As%20A%20Function%20Of%20Hydraulic%20Retention%20Time.pdf |
| Summary: | In this paper we operated an upflow anaerobic sludge blanket reactor (UASBR) continuously at 35 °C in order to observe the effects of varying the hydraulic retention time (HRT) from 3.5 to 34.5 d and varying the organic loading rate (OLR) from 1.5 to 46 kg COD m−3 d−1. The pH of the digester improved, which we varied from 1.5 to 14.5 g L−1 CaO-CKD, a range pH 7.5. A high COD degradation rate of 97% and mixed liquor suspended solids (MLVSS) of 99,000 mg L−1 were achieved at an HRT of 24.5 d. The maximum methane yield was 0.346 l CH4/g CODremoved. A CO2 reduction of 87% was obtained at an OLR of 26.5 (r = 0.99). The optimum conditions for digestion of the palm oil mill effluent were determined by studying the bio-kinetics of granulation. The growth yield (YG) was 1.45 g VSS/g CODremoved day; the specific biomass decay (b) was 0.056; the specific biomass growth rate (μmax) was 0.988 d−1; the saturation constant (Ks) was 460; and the critical retention time (Θc) was 2.464 d−1. With a feed flow rate (QF) of 1.65 l/d, the upflow velocity (Vup) was 0.6 m/h, and for a QF of 2.45 l/d, Vup was 0.75 m/h. |
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