Chlor-alkali industry needs cleanliness
In recent years, certain progress has been made in the clean production of China's chlor-alkali industry, and the energy consumption of caustic soda and polyvinyl chloride (PVC) unit products has declined in 2011 compared to 2009. At the same time, due to the increase in industry capacity, the PVC waste water discharge in 2011 increased by 7.9 million tons compared with 2009, and the task of cleaner production in the chlor-alkali industry is still heavy. The focus of the future clean production of the chlor-alkali industry will be mainly on COD emission reduction, ammonia nitrogen emission reduction, heavy metal mercury reduction and emission reduction. This is the information that the reporter obtained from the 2012 annual meeting of environmental protection work in the chlor-alkali industry.
According to Yu Enlin, director of the Department of Political Research of the China Chlor-Alkali Industry Association, the clean production of the chlor-alkali industry in China has achieved remarkable results in recent years. Energy consumption and water consumption per unit of caustic soda and PVC have declined to varying degrees, and COD reduction in wastewater has also been achieved. Good results. In particular, waste asbestos will be banned from the production of membrane caustic soda in 2015, and the emission reduction rate of asbestos will reach nearly 95% by 2015, and carbide slag will achieve 100% comprehensive utilization.
The wastewater discharge of the AC foaming agent industry has always been the focus of attention in the chlor-alkali industry. The industry's ammonia-nitrogen wastewater discharge accounts for 17% of the entire petrochemical industry, showing the characteristics of small industries, large emissions, and difficult governance. Due to the development of the ketene-nitrogen method and the new technology without acid condensation, the ammonia nitrogen wastewater from the AC foaming agent industry has been greatly improved, and the ammonia nitrogen wastewater reduction can reach over 30%. “The proportion of clean production advanced enterprises in the chlor-alkali industry has increased to 30%, which has met the industry's expected emission reduction targets,†said Yan Enlin.
According to Yu Enlin, the chlor-alkali association cooperated with the Ministry of Industry and Information Technology and the Ministry of Environmental Protection to formulate clean production standards for the chlor-alkali industry, guidelines for cleaner production audits in the chlor-alkali industry, and evaluation indicators for cleaner production in the chlor-alkali industry, instructing companies to improve their technical level and review compliance. According to relevant statistics, the clean production audit rate of chlor-alkali enterprises has reached 30%, which is higher than the overall level of 6% of industrial enterprises in the country.
However, Miao Enlin also said that due to the increase in the production base of the chlor-alkali industry, there have been significant increases in the emission of pollution factors in PVC production. Among them, the amount of PVC waste water discharge and the production of hazardous waste (including mercury waste activated carbon) all increased in 2011 compared to 2009. "The chlor-alkali industry's future emission reduction tasks are arduous, and clean production work is a long way ahead," said Yan Enlin.
Yu Enlin pointed out that the prevention and control of mercury pollution will be one of the focuses of the clean production work in the chlor-alkali industry. The Chlor-Alkali Association has cooperated with the petrochemical association to compile the “Twelfth Five-Year Plan†environmental protection development report for the chemical industry and the calcium carbide method for PVC mercury pollution. Prevention and Control Plan, the mercury pollution control project was included in the National Plan for the Control of Heavy Metal Pollution. At present, the heavy metal pollution prevention and control projects of some companies such as Yunnan Salinization Company and Haohua Aerospace Company have received support from the state financial funds. In order to enable a clean production model for the transformation of new enterprises and old enterprises, the Association also specially organized the “General Design for the Prevention of Mercury Pollution in the Calcium Carbide Process PVC Industry†to enable the transformation of old companies and the reduction of mercury emissions of new enterprises. Start from the source.
It is understood that in order to further promote the clean production of the chlor-alkali industry, the chlor-alkali association has identified the next five priorities of environmental protection: formulating policies, regulations, and standards that are consistent with the scientific development of the industry, strengthening the promotion of relevant policies, and guiding the healthy and sustainable development of the industry. Development; strengthen the research and development, promotion and application of advanced and applicable environmental protection and clean production technologies, and work with the petrochemical association to obtain relevant policies and financial support from the country, encourage enterprises to improve environmental protection and clean production levels through technological innovation and technological transformation; Exchange platform; Strengthen cleaner production training, promote cleaner production audit compliance; Further strengthen mercury pollution prevention and control work, promote low-mercury catalysts and strengthen research and development of mercury-free catalysts in line with the established “reduction, non-mercury†guideline. At the same time, it actively participated in the negotiation of the international mercury convention
According to Zhang Wenlei, secretary-general of the chlor-alkali association, the fifth and final negotiations of the 2013 International Mercury Convention will be held in Geneva, Switzerland, and a resolution will be reached on the relevant articles. The meeting will have an important impact on the prevention and control of mercury pollution in China. At present, the association is assisting the relevant national authorities to actively respond to international negotiations in order to promote the sustainable development of the industry.
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