Tannery effluent as a carbon source for biological sulphate reduction
Tannery effluent was assessed as a carbon source for biological sulphate reduction in a pilot-scale upflow anaerobic sludge blanket (UASB), stirred tank reactor (STR) and trench reactor (TR). Sulphate removals of between 60–80% were obtained in all three reactors at total sulphate feed levels of up...
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Veröffentlicht in: | Water research (Oxford) 2004-06, Vol.38 (11), p.2651-2658 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Tannery effluent was assessed as a carbon source for biological sulphate reduction in a pilot-scale upflow anaerobic sludge blanket (UASB), stirred tank reactor (STR) and trench reactor (TR). Sulphate removals of between 60–80% were obtained in all three reactors at total sulphate feed levels of up to 1800
mg
l
−1. Sulphate removal in the TR (400–500
mg SO
4
l
−1
day
−1) and UASB (up to 600
mg SO
4
l
−1
day
−1) were higher than those obtained in the STR (250
mg SO
4
l
1
day
−1). A change in operation mode from a UASB to a STR had a large impact on chemical oxygen demand (COD) removal efficiencies. COD removal rates decreased by 25% from 600–700
mg COD
l
−1
day
−1 to 200–600
mg COD
l
−1
day
−1. The TR had an average COD removal rate of 500
mg COD
l
−1
day
−1. Large quantities of sulphide were produced in the reactors (up to 1500
mg
l
−1). However due to the elevated pH in the reactor, only a small amount was in the form of H
2S and thus the odour problem normally associated with biological sulphate reduction was not present. |
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ISSN: | 0043-1354 1879-2448 |
DOI: | 10.1016/j.watres.2004.03.030 |