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Granulation in anaerobic sludge bed reactors treating food industry wastes
AbstractThree parallel laboratory reactors, R1, R2 and R3, received food industry wastewater: R1 unadulterated; R2 supplemented with calcium and phosphate; R3 supplemented with ferric chloride and traces of nickel and cobalt. Reactors were packed with active granular sludge from a large scale pilot reactor treating the same wastewater. Addition of calcium and phosphate was found to be detrimental to the granule formation at naturally established reactor pH = 6·9–7·4 in R2 while iron promoted granulation in R3. Conditions of upflow velocities of 1·5–6 m h−1, rapid increase of loads up to 15 kg COD m−3 day−1 and ratios of recycle to raw waste feed of 20:1–80:1 were imposed on all reactors. The granules in R1 and R2 disintegrated, from 70–100 g liter−1 VSS to a flocculant sludge at 1·5–3 g liter−1. In spite of such severe washout, reactors R1 and R2 were able to maintain a steady COD removal of over 90% at a load of 10kg m−3 day−1. R3 retained a VSS concentration around 100 g liter−1 and maintained COD removal at over 95%. R3 exhibited a more stable performance and was less vulnerable to the shock treatment to which all reactors were subjected.
Granulation in anaerobic sludge bed reactors treating food industry wastes
AbstractThree parallel laboratory reactors, R1, R2 and R3, received food industry wastewater: R1 unadulterated; R2 supplemented with calcium and phosphate; R3 supplemented with ferric chloride and traces of nickel and cobalt. Reactors were packed with active granular sludge from a large scale pilot reactor treating the same wastewater. Addition of calcium and phosphate was found to be detrimental to the granule formation at naturally established reactor pH = 6·9–7·4 in R2 while iron promoted granulation in R3. Conditions of upflow velocities of 1·5–6 m h−1, rapid increase of loads up to 15 kg COD m−3 day−1 and ratios of recycle to raw waste feed of 20:1–80:1 were imposed on all reactors. The granules in R1 and R2 disintegrated, from 70–100 g liter−1 VSS to a flocculant sludge at 1·5–3 g liter−1. In spite of such severe washout, reactors R1 and R2 were able to maintain a steady COD removal of over 90% at a load of 10kg m−3 day−1. R3 retained a VSS concentration around 100 g liter−1 and maintained COD removal at over 95%. R3 exhibited a more stable performance and was less vulnerable to the shock treatment to which all reactors were subjected.
Granulation in anaerobic sludge bed reactors treating food industry wastes
Oleszkiewicz, J.A. (author) / Romanek, A. (author)
Biological Wastes ; 27 ; 217-235
1988-07-26
19 pages
Article (Journal)
Electronic Resource
English
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