Sludge exchange process on two serial CSTRs anaerobic digestions: process failure and recovery |
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Authors: | Kafle Gopi Krishna Kim Sang Hun |
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Institution: | Department of Biosystems Engineering, Kangwon National University, Chuncheon, Kangwon-do, Republic of Korea |
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Abstract: | 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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Keywords: | Serial digestion Sludge exchange Process failure and recovery CSTR TVFA/alkalinity ratio |
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