Effect of sodium tungstate on anaerobic digestion of waste sewage sludge: Enhanced methane production via increased acetoclastic methanogens

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 increased. The pH increased presence tungstate, correlating result consumption time WSS. analyses methanogenesis via acetoclastic and hydrogenotrophic methanogens indicate methane from high addition, addition to initial fresh enhance acetate; therefore, may increase number rather than promote catalytic reaction related production. archaeal population supported (mostly Methanosaeta ) detail, when compared control WSS, percentage significantly 3.02% 31.20% Furthermore, growth Methanosarcina acetivorans C2A. Taken together, increases increasing methanogenesis. • (2.17-times higher) through using sludge. at 7.2. acetic acid promoted which improved. Acetoclastic methagenesis activated methanogens.