ABSTRACT
Abstract The use of constructed wetlands to improve water quality has spread to many fields including industrial effluent treatment. A pilot-scale study was undertaken at the Pan African Paper Mills (E.A.) Ltd. in the western highlands of Kenya to establish the efficiency of a subsurface flow constructed wetland in purifying pre-treated pulp and paper mill wastewater with respect to organic matter (BOD, COD) and suspended solids (TSS). The study further determined the reaction rate parameters and residuals for BOD removal. The wetland operation involved varying hydraulic loading rates, retention times, operation modes and macrophyte growth conditions.
