A Semi-Pilot Plant Fermenter for the Production of Coagulant-Aids From Diary Products Waste Water

Abstract

#dried suspension of the extracellular materials (DSEM) from batch fermented diary product wastewater, that acted as a coagulant-aids, for raw water treatment was produced in a massive quantity using fermenter designed on the following specification; 55 liter (diary products wastewater, plus 25mg/L of molasses); Mixing speed, pH, growth temperature, and fermentation time were, 1490rpm, 6.8, 28 C, and 120h respectively. At the end of fermentation time the yield of DSEM was 75.3gm (i.e. the dry weight of extracellular materials suspension). When 28mg/l of DSEM was added to the raw water, the alum-floc sizes increased four- folds. The sedimentation time reduced by 31.6% and the increased in turbidity reduction was 41.1%.