The Assessment Of Environmental Risk And Present Environmental Quality In The Sea Near A Petrochemical Industrial Park

In view of the present situation of Petrochemical Industrial Park and the existingproblems, the planning coordination was systematically analyzed from Industrialdevelopment planning, land use planning, public facilities planning and environmentalprotection planning. Based on the investigation of the sea environment near thePetrochemical Industrial Park, the oil leakage, leakage of methanol, pollutants in thehigh saltwater were predicted and evaluated in the seawater, and the extent ofvariation and influence were determined during the process of diffusion and transportin the ocean. Some index of sea quality met the two class of sea water quality standard,such as pH, COD_Mn, DO, petroleum, inorganic nitrogen, Hg, Cr, As, Cu, Zn, Pb, Ni,phosphate and sulphide. The sulphide in the S2site exceeded the two class of seawater quality standard, but it met the three class of sea water quality standard. Thephosphate in the S4, S13and S21sites overrun the three class of sea water qualitystandard. In marine sediments, the pollutants are in line with the first categorysediment standard, such as oil, sulfide, zinc, copper, mercury, cadmium, arsenic, leadand other evaluation factors.The dominant phytoplankton species in this area were Pseudo-nitzschia pungens,Cerataulina pelagica and Noctiluca scintillans. The dominant species of Planktonicanimal was obvious, and the distribution of biomass and abundance accorded withthe general law of offshore distribution of pelagic animal. The index of speciesdiversity of benthic fluctuates between2.0444and3.5125, the diversity index wasgreater than2.Biomass of organisms in the midtidal region of intertidal zone was more thanthat in high tidal region and in low tidal region, and the density in the in high tidalregion was higher than that in the midtidal region and low tidal region. Thebiodiversity index, uniformity and abundance were in the range of0.1785to3.3605,0.11Oil spill for different wind drift and area expansion path is different after the oilspill accident. In the setting scheme of marine oil, oil spill near the island happen inthe condition of north wind and south wind, and oil spill can drift to the waters nearthe Red island. The static wind condition of oil film can drift to the central Gulf of Jiaozhou and the bay mouth. The static wind climax of oil spill drift to the centralGulf of Jiaozhou and the bay mouth, and the static wind down to the Gulf of Jiaozhouoil spill drift in the middle. Therefore, it is necessary to strengthen the preventionmeasures, the response equipment of oil spill and team building. When the oil spillhappens, it must be take the emergency measures of oil spill in the shortest possibletime.When methanol leak into the sea under the action of the tides, it spread from theleaking point to the west by the dilution and diffusion of seawater. The effect range of0.2mg/L methanol increased before3h, and the effect range of over0.2mg/Lmethanol was2.3km², and then began to decrease. The concentration of methanoldecreased to0.2mg/L after18h.By analyzing the impact of high saline water on the marine environment, COD_Mnconcentration distribution from the outfall to the sea showed a decreasing trend,smaller, and it did not overtopped the three and four class of sea water qualitystandard. The NH₄⁺-N, S^2-, petroleum and volatile phenol did not overtopped the threeand four class of sea water quality standard. The outfall of Huangshanzui has no effecton biological resources and fishery production, and it does not destroy the ecologicalstructure of biological resources.