Effect of Pulp and Paper Mill Effluents on Phytoplankton (Duck Weed)

To assess the effect of pulp paper mill effluents on phytoplankton, duckweed (Spirodela polyrriza) were exposed to 100, 75, 50 and 25% concentration of the effluents for 7, 14, 21 and 28 days exposure. Data demonstration that duckweed showed significant accumulation of metal (Cu, Fe and Zn) which were dependent on concentration and exposure duration. A maximum accumulation of metal was recorded in higher concentration of the effluent. Impact of different concentration of pulp and paper mill effluents on the total chlorophyll content and biomass exposed duckweed plant for varying days was also studied. Reduction of total chlorophyll content and biomass of duckweeds was recorded at higher effluent concentration and prolonged duration of treatment

Physical Study of the Paper Mill Effluent

In the present study, variation in water temperature had been found chiefly associated with temperature of the atmosphere and weather condition. It also depends upon the discharge of heated waste water which bring about thermal change in water electrical conductivity values becomes higher when electrolytes of different solubility increase in the waste water and dissociated into anions and cation. Electrical conductivity (mScm-1) varied greatly at different sites during different month. Transparency has been found to increase during winter month. Transparency of water is inversely proportional to turbidity which is turn reflect the amount of suspended organic and inorganic matter of effluent