RESUMEN
The growth stimulation (+) and inhibition (-) of algae treated with pulp and paper mill effluent was investigated in laboratory culture condition. The result revealed that the effect of paper mill effluent on algae was species specific. Effluents were stimulatory as well as inhibitory to the growth of test algae . Oscillatoria chlorina tolerated higher concentration where as Scenedesmus quadricauda tolerated lower concentration of effluent. At 100% effluent concentration growth was retarded and inhibition was the result. During investigation significant algal growth was observed between concentration and treatment days of which 21 days incubation period was considered as final yield.
RESUMEN
The Rayon grade pulp (RGP) drain effluent of pulp and paper mill was studied to find out pollutant loading and its control measures by low cost and efficient treatment method. Upflow anaerobic fixed packed bed reactor (UAFPBR) with brick ballasts as packing material was used for this purpose. This was compared with conventional anaerobic treatment method. The digested slurry was taken as inoculum from the active cow dung biogas plant. After stabilization of the reactors the reduction in pollutant loading was found to be higher in UAFPBR than conventional anaerobic reactor (CAR). Hydraulic retention time (HRT) of 12 hr was optimum for the treatment of effluent when 74.5% COD and 81% BOD reduction was obtained. 30% inoculum concentration was best for the anaerobic treatment of RGP colour drain effluent. The maximum biogas production (1.37 l l-1 of effluent) was when the effluent was inoculated with 30% seeding material. Thus, UAFPBR system was very efficient in terms of BOD, COD, TSS and TDS removal from RGP drain of paper mills in ambient environmental conditions.