Sludge exchange process on two serial CSTRs anaerobic digestions: Process failure and recovery
The sludge exchange process using two anaerobic digesters (CSTRs) in series was investigated under the mesophilic condition (36–38 °C). At first, the digesting sludge of the CSTRs in series with different TVFA/alkalinity ratios was tested in the laboratory by mixing the digesting sludge of two CSTRs...
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Veröffentlicht in: | Bioresource technology 2011-07, Vol.102 (13), p.6815-6822 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | The sludge exchange process using two anaerobic digesters (CSTRs) in series was investigated under the mesophilic condition (36–38
°C). At first, the digesting sludge of the CSTRs in series with different TVFA/alkalinity ratios was tested in the laboratory by mixing the digesting sludge of two CSTRs from 6.5% to 50% based on volume. The sludge exchange test was then performed using the same CSTRs under batch and continuous processes. The change in the TVFA/alkalinity ratio was found to be linear with the digesting sludge exchange volume. The CSTR of TVFA/alkalinity ratio 1.970 recovered completely failed within 11
days for the batch process and the CSTR of TVFA/alkalinity ratio 1.514 within 3
weeks for the continuous feeding process at a sludge exchange volume of 13%. The reactor operation was stable when the TVFA/alkalinity ratio was less than 1.0 and when the TVFA concentration was lower than 10,000
mg
L
−1. |
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ISSN: | 0960-8524 1873-2976 |
DOI: | 10.1016/j.biortech.2011.04.013 |