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In order to evaluate the efficiency of anaerobic activated sludge in hydrogen-producing system, iodonitrotetrazolium chloride (INT) and triphenyl tetrazolium (TTC) assay were optimized for detecting the specific dehydrogenase activity of the flocs. The results showed that both INT and TTC assay under the optimum conditions could be used to determine dehydrogenase activity. In comparison with TTC assay,...
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