Kinetic Study of an Aerobic Digestion With Biomass Retention by Ultrafiltration Membranes
In this study, a 50 litre laboratory-scaled membrane anaerobic system (MAS ) combining ultrafiltration (UF) membrane with anaerobic reactor was used to treat palm oil mill effluent (POME) at ambient temperature. Six steady states were attained as part of a kinetic study. The results of steady st...
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| Format: | Thesis |
| Language: | English English |
| Published: |
1997
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/10011/1/FK_1997_10_A.pdf |
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| Summary: | In this study, a 50 litre laboratory-scaled membrane anaerobic system
(MAS ) combining ultrafiltration (UF) membrane with anaerobic reactor
was used to treat palm oil mill effluent (POME) at ambient temperature.
Six steady states were attained as part of a kinetic study. The results of
steady state 4 (SS4) was adversely affected by a long shutdown due to
pump leakage. The results of the five remaining steady states were
successfully fitted, above 96%, by Monod, Contois, and Chen and
Hashimoto models. Contois Model appeared to be the best at 99.7%.
The microbial kinetic constants are Y=0.83gVS S/gCOD and b=0.15
day·I. Minimum solids retention time, ecmin obtained from the three
simulation models range from 6-14.3days. Maximum total gas yield was
measured at 0.621 litre/g COD at an organic loading rate (OLR) of 5.0
kgCOD/m3/d.%CH4 composition decreases from 75.7% at OLR of 1.8kgCOD/m3/d, to 62.3% at OLR of 6.0 kgCOD/m3/d. The percentages of
COD removal were achieved between 99.0%-88.9% over a range of
mixed liquor suspended solids of 10, 033-22, 175 mg/I. The final
hydraulic and solids retention time, e and e have been reduced to 8.3_c
days and 12.5 days, respectively during SS6. Under scanning electron
microscope (SEM), the effective pores of the membrane was found to be
pores larger than 0.1f-Lm. Layers of fibrous growth on the membrane
surface increase separation efficiency. More efficient and frequent
cleaning is required to inhibit membrane fouling and increase permeate
flux. Overall, this study indicated that MAS is capable of treating higher
OLR when Өc is maintained above 20 days. |
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