SPC, a petrochemical conglomerate with highly integrated production and operations of petroleum products, petrochemicals, synthetic fibers and plastics, also the first one in Sinopec to have been rationalized under joint-stock system. With the increase of the processing ratio of sour crude, environmental problems and new treatment requirements follow up. It is an essential link in the Company's development plan to balance the relation between production development and environmental protection in line with the national restriction in the discharge of pollutants so as to implement the sustainable development strategy.
Through the project construction of “Phase I to Phase IV”, SPC has invested a lot in environmental protection. SPC has built another 57 sets wastewater-treatment facilities, 45 sets of waste gas scrubbing facilities, 10 pieces of equipment for waste residue treatment and a 3,800 m2 temporary stack-yard for chemical waste.
The discharge of three wastes of the Company has reached the national standard, and there is no severe pollution or ecology-destructive accidents over thirty years since establishment because of the scientific overall environmental protection planning, reasonable layout and the strengthening of the "Three Simultaneities" management over new, reconstruction or extension projects. During the implementation of new, rebuilding, extension and technical alteration projects, rules and regulations including the “Regulations on Environmental Protection in Project Construction” issued by the State Council, the “Implementation Details of Environmental Protection Management in Sinopec’s Project Construction” and the “Methods of Environmental Protection Management for Project Construction in Shanghai” have always been observed. Meanwhile, we have also strictly carried out environmental assessment, reinforced the management system of the "Three Simultaneities", and actively implemented the “Principle of Former Projects Observing the New ones” to control new pollutants.
As for environmental protection of the Company, three principles are always being followed, that is: the principal of three-level administration and two-level inspection, the principal of diffluence of clean and waste water, and the principal of “Checking by Every Level and Disposing by Different Levels”. The Company’s 2nd-grade waste water treatment facilities are able to treat waste water of 190,000 tons per day. The discharge of all kinds of waste gases is nearly 20 million cubic meters. The waste gases are discharged into the atmosphere after burning through 38 chimneys, 40 exhaust pipes and 8 flares. The measurement result of the four indexes of sulfur dioxide, nitrogen oxides, cyanides and total suspended particulates at five monitor points covering production area, agricultural area and living area reveals that the atmospheric environmental quality around the Company's circumference so far meets the national atmospheric standard II, and the sanitation standard for inhabitance and the concentration of ethylene accords with the demands of protection for agricultural production. The annual discharge of waste water is 150 million tons in total from all production units, i.e., 0.41 million tons per day (including directly discharged cooling sea water and domestic sewage). The waste water is pumped to the Hangzhou Bay through the new and old Suitang River Pump Stations, among which about 44.80 million tons have been treated in Water Purification Plant annually. Since the Deep-sea Discharge Port of the No. 2 Anti-flood Pumping Station was completed and put into operation in May 2003, cooling water from refrigerators and compressors of the Refinery and Petrochemical Division, the Polyester Fiber Division, the Chemical Division and the Acrylic Fiber Division and cooling seawater from No. 1 Ethylene Plant has been discharged into the North Suitang River upon internal treatment to meet the standard, and then discharged to Hangzhou Bay after being raised at No. 2 Pumping Station. The volume of cooling water per day is about 280,000 cubic meters per day. The treated waste water originally discharged from No.4 Anti-flood Pump to the Hangzhou Bay now is also discharged to the Hangzhou Bay through the Deep-sea Discharge Port of the No. 2 Anti-flood Pumping Station. The total solid wastes produced in the process of production is 325,000 tons, among which 286,800 tons, or 88.15%, are fly ash of Thermal Power Plant, and 38,200 tons are other kinds of solid wastes. All the solid wastes, except those being utilized comprehensively, are treated in legal ways.
The sludge treatment facilities are equipped with sludge dehydration plants with a daily processing capacity of 1,500 tons and sludge drying equipment imported from Germany, with leading treatment technology at home.
The waste gas treatment is equipped with acidic steam scrubbing plants, sulfur recovery plant with an annual yield of 80,000 tons and CFB desulfurzation plant, with a desulfurzation rate of more than 90%.
In order to meet the standard for waste water discharge, the Company invested a lot in the rectification of pollution and improvement of environmental prevention. For example, the clean water sewage systems of departments including the Chemical Division, the Polyester Fiber Division, the Acrylic Fiber Division, which resulted in pollution of the Suitang River, were rebuilt to branch off clean and waste water and to diverge the waste water which will pollute the clean water sewage system to the waste water system. With several years’ efforts, the water quality of Suitang River has been improved distinctly, with the annual average discharging COD concentration lower than 65mg/l. The collection tank of the No.3 Anti-flood Pump Station was reconstructed to ensure the water discharged through the station is up to the standard.
To further reduce the total discharge of sulfur dioxide so as to improve the quality of atmospheric environment, the Company reinforced the management of flue gas desulfuration of Thermal Power Plant. After completion of the pilot research project of “Stripping off Sulfur Dioxide of Power Plant by Sea Water”, the Company entrusted the Shanghai Electricity Design Institute with the design of the “Project on Flue Gas Desulfuration by Lime-plaster” for the General Thermal Power General Plant (Coal-fired Station), which has been finished and submitted to Sinopec Group. In addition, the industrial experiment on adding desulfuration additives into fuel oil for the General Thermal Power General Plant (Oil-fired Station) was carried out, the desulfuration ratio of which reached about 30%.
The completion of the writing and appraisal of the report on environmental influence of the overall planning of the three-phase reconstruction of ethylene and its supporting project has scientifically mapped out the future development for the Company as well as provided scientific evidence for realization of such targets as strict observation of supervision and management rules on environmental protection, enforcement of the basic state policies on environmental protection and the strategy of sustainable development, emphasis on both pollution control and preservation of the ecological environment so as to build the image of a green enterprise.