• Long-term continuous anaerobic digestion experiments treating sewage sludge (> 450 d). Effects of CO 2 enrichment on the process. Significantly increased methane production as immediate response to enrichment. Sustainably enhanced specific at higher organic loading rates. Improved process resilience after disturbance in a -enriched environment. The effect (AD) potential strategy improve bioga...

In this study, the effect of sodium tungstate on anaerobic digestion waste sewage sludge (WSS) was investigated. Methane production enhanced by in a dose-dependent manner. Sodium did not affect hydrolysis stage as same level protease activity detected WSS sample with or without tungstate. At acidogenesis stage, concentration acetate decreased during supplemented whereas that isobutyrate increas...

In this study, the microbiomes linked with operational parameters in seven mesophilic full-scale AD plants mainly treating food waste (four plants) and sewage sludge (three were analyzed. The results obtained indicated lower diversity evenness of microbial population digestion (SD) compared to (FD) plants. Candidatus Accumulibacter dominated (up 42.1%) SD due immigration from fed secondary 89%)...

The fermentation characteristics of activated biomass from two types of sludge, namely primary sludge (PS) and excess sludge (ES) were compared under three pH conditions (uncontrolled, 4, 10) over a period of 8 days. Results show the highest production of short-chain fatty acids (SCFAs) in PS and ES of 352 ± 7 and 324 ± 13 mg COD/g VSS, respectively at pH 10, on the 2 day in PS fermentation, an...

To expand the chemical and molecular diversity of biotransformation using whole-cell biocatalysts, we genetically engineered a pathway in Escherichia coli for heterologous production of butanone, an important commodity ketone. First, a 1-propanol-producing E. coli host strain with its sleeping beauty mutase (Sbm) operon being activated was used to increase the pool of propionyl-coenzyme A (prop...