pH Numerical Simulation of the Desulfuration Acidic Effluent Discharge of Power Plant and Its Impact Prediction on Phytoplankton in Seawater

摘要

To understand the change regions of pH and the effect on phytoplankton while the acidic effluent of desulfuration from power plants draining into seawater,the changing modes of phytoplankton species and quantity to pH were established in seawater through laboratory survey in this work. Then,the ECOMSED model was applied to predict the change scope of pH and the ecological influences on phytoplankton due to the acidic effluent from a programming power plant in Zhanjiang Bay. The experimental results in laboratory showed that the species of phytoplankton changed with pH in a rule of convex parabola,and the quantity of phytoplankton decreased linearly with the fall of pH. The results of pH numerical simulation indicated that the acidic effluent from the power plant flowed zonally with tide. When the pH value of surface seawater decreased from the background value of 8. 0 to 7. 8,the extreme area influenced harmfully by the acidic effluent was near 30. 70 km2,accounting for about16.2% of the total area of Zhanjiang Bay( 190 km2). The predict results of ecological impact showed that if the species and quantity of phytoplankton decreased by5% in surface seawater,the corresponding extreme areas influenced harmfully by the acidic effluent were 0. 40 and 10. 81 km2,accounting respectively for 0. 21% and 0. 53% of the total area of Zhanjiang Bay. Moreover,around the outlet of the power plant where the pH value of seawater was near to 6. 8,the species and quantity of phytoplankton decreased most. However,the corresponding influenced area was rather small,just about0. 15 km2,accounting for 0.08% of the total area of Zhanjiang Bay.