An investigation of the effects of the addition of powdered activated carbon to the activated sludge of cellulose acetate manufacturing wastewater
Abstract
Equilibrium powdered activated carbon (PAC) concentrations
of 20, 160, and 280 mg/L in activated sludge reactors
treating cellulose acetate manufacturing wastewater were
found to enhance substrate removal. The improved substrate
removal as measured by COD averaged 20 percent. The apparent
mechanism of improved removal was the stimulation of greater
biomass growth.
PAC addition increased the oxygen uptake rate (OUR), the
observed cell yield coefficient (Ybbs) and the first order
substrate removal coefficient (Kb) of the activated sludge
system, which were operated at a temperature of 18°C and a
biological solids retention times of fourteen days. The
addition of PAC also improved the sludge settleability but
this resulted in higher effluent suspended solids
concentration because zone settling Velocity was the primary
factor affecting effluent suspended solids.
A type of activated sludge bulking, known as jelly
formation, plagued the biological reactors but nitrogen
addition appeared to solve the problem
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- Masters Theses [19687]