A semi‐piolet plant fermenter for the production of coagulant‐aids from brewery wastewater

Abstract

Dried suspension of the extracellular materials (DSEM) from batch fermented brewery wastewater that acted as a coagulant‐aid for raw water treatment was produced in massive quantity using a fermenter designed on the following specifications; Capacity, 55 liter (brewery wastewater, plus 25 mg/1 of molasses) I Mixing speed, PH, temperature and time of fermentation were, 1490 rpm, 6.8, 28 c and 120h respectively.

After fermentation time the yield of DSEM was 79.2g (i.e. dry weight of extracellular materials suspension). When 32mg/l of DSEM was added to the raw water, the alum—floc sizes increased four—fold, while the sedimentation time reduced 41% and the increase in turbidity reduction 33.6%.