Production of volatile fatty acids from sewage organic matter by combined bioflocculation and alkaline fermentation

Dataset

Description

This study explored the potential of volatile fatty acids (VFA) production from sewage by a combined high-loaded membrane bioreactor and sequencing batch fermenter. VFA production was optimized with respect to SRT and alkaline pH (pH 8–10). Application of pH shock to a value of 9 at the start of a sequencing batch cycle, followed by a pH uncontrolled phase for 7 days, gave the highest VFA yield of 440 mg VFA-COD/g VSS. This yield was much higher than at fermentation without pH control or at a constant pH between 8 and 10. The high yield in the pH 9 shocked system could be explained by (1) a reduction of methanogenic activity, or (2) a high degree of solids degradation or (3) an enhanced protein hydrolysis and fermentation. VFA production can be further optimized by fine-tuning pH level and longer operation, possibly allowing enrichment of alkalophilic and alkali-tolerant fermenting microorganisms.
Date made available2015
PublisherWageningen UR
Geographical coverageThe Netherlands

Cite this

Khiewwijit, R. (Creator), Temmink, B. G. (Creator), Rijnaarts, H. H. M. (Creator), Keesman, K. J. (Creator)(2015). Production of volatile fatty acids from sewage organic matter by combined bioflocculation and alkaline fermentation. Wageningen UR. 10.17026/dans-zcf-j46d