An experimental investigation on growth stimulation (+) and inhibition (-) of algae (oscillatoria.chlorina and scenedesmus.quadricauda) treated with pulp and paper mill effluents.

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.