Clarification of the effluent of an anaerobic digestion process: comparative study of single-stage and double-phase processes, with addition of coagulant and without addition of chemical coagulant

Abstract

A study of the phenomenon of sedimentation of sludge from the anaerobic digestion of codigestion phases and monostage was performed, compared with addition and without addition of coagulant, the dose and concentration required was determined in the laboratory by jar test, the concentration of FeCl3 resulted in 15000 mg / l. The results of the sedimentation curves of the interface below codigestion phases fit the equation y = 0.0861 x2 -14.198 x + 970.63, the interphase curves below co-digestion phases with addition of FeCl3 fits an equation y = 0.0714 x2 - 12.512 x + 1008.4, the interface above single-stage codigestion fits an equation y = 0.0423 x2- 6.3681 x + 917.91, the interface below single-stage codigestion fits an equation y = 0.0953 x2 - 15.714 x + 975.1, the interface above single-stage codigestion with addition of FeCl3 fits an equation y = 0.0393 x2 - 5.196 x + 977.79, the interphase below single-stage codigestion with addition of FeCl3 fits into an equation y = 0.838 x2 - 13.824 x + 981.43.