Influence of the organic volumetric loading rate on soluble chemical oxygen demand removal in a down-flow fixed-bed reactor treating abattoir wastewater
✍ Scribed by Rafael Borja; Charles J. Banks; Antonio Martín
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 1995
- Tongue
- English
- Weight
- 482 KB
- Volume
- 64
- Category
- Article
- ISSN
- 0268-2575
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✦ Synopsis
A laboratory-scale anaerobic down-flow fixed-bed reactor, operating at 3 5 T , was used to treat abattoir wastewaters at input soluble chemical oxygen demand (COD) levels ranging from 4.7 to 28.7 g dm-3 and volumetric organic loading rates ranging from 2.5 to 25 g C O D dm-3 day-'. Start-up of the reactor was achieved within 35 days using a regime that included stepped increases in input C O D and methanol substitution. The effects of the organic volumetric loading rate on soluble C O D (SCOD) removal were studied at four feed SCOD concentrations between 4.7 and 28.7 g dm-3. An exponential dependency of the organic volumetric loading rate with the SCOD removal was observed in the range of loadings studied, with variation between 1 and 12 g C O D d m -3 day-'. Further increases of the organic loading rates had smaller effects on SCOD removal. A pseudo first-order kinetic model was used to obtain the gross removal coefficients, the values of which were virtually independent of the feed C O D concentration at 6.9 to 7.3 g C O D dm-3 day-'. The methane yield coeficient decreased slightly from 0.34 to 0.31 dm3 g-' COD when the feed SCOD concentration was increased from 4.7 to 28.7 g dm-'.