According to the China Chemical Industry Association for Prevention of Pollution Technology, the environmental protection technologies and measures for China's chlor-alkali industry during the 10th Five-Year Plan period are:
(1) The ion-membrane method shall be adopted for the new, expanded and modified caustic soda devices. It is forbidden to build a caustic soda production device with an annual output of 10,000 tons or less.
(2) In the production of caustic soda, the use of salt for washing should be actively used as a raw material instead of raw salt, so that the amount of salt sludge produced can be reduced from 40-50 kg per ton of caustic soda to 15-20 kg.
(3) Reform the brine purification process, and use multiple measures such as water washing and sedimentation pressure filtration to treat the salt mud, so that the NaC1 contained in the salt mud is reduced to 1-2 g/L. The washing water is reused in the salting process, and the salt mud is comprehensively used or properly stored.
(4) The existing diaphragm method is used to produce asbestos waste water discharged from caustic soda equipment. Gravity sedimentation vacuum suction filtration or centrifugal filtration is used to recover asbestos as much as possible, and the asbestos lining in waste water is reduced from 3-8 g/L. 0.2-0.3g/L.
(5) The newly-built and expanded PVC units should be located as close as possible to the ethylene production site, or economically viable to divert ethylene dichloride and vinyl chloride, using ethylene oxychlorination. Areas where electricity prices are cheap can adapt to market competition and acetylene can also be used.
(6) The construction of open type calcium carbide furnaces and calcium carbide furnaces with an annual output of 10,000 tons or less is prohibited.
(7) Closed-type calcium carbide furnaces newly built or expanded must adopt advanced technologies and equipment such as mature furnace gas purification and dry dust removal, and be equipped with waste heat utilization devices to prevent dust and furnace gas pollution.
(8) Existing large-scale open type calcium carbide furnaces should be fully converted to closed type calcium carbide furnaces before 2005, using domestic mature gas purification and dry dust removal technologies, recycling furnace gas as fuel or comprehensive utilization of waste heat.
(9) Mercury-containing waste water produced by the acetylene process of vinyl chloride, using iron reduction method and legal carbon adsorption method to eliminate mercury pollution, and the mercury concentration after treatment reaches the national emission standard, and the pass rate reaches 100%.
(10) Treatment of calcium carbide wastewater is performed by oxidation or recycling. The treated wastewater is reused for production. After the calcium carbide slag is dehydrated, it is sent to the rotary kiln for calcining lime to be used for the production of calcium carbide, or used as cement and other building materials.
(11) In the process of rectification of vinyl chloride, a high concentration of VCM is discharged at the top of the tower (up to 30-50%), and the activated carbon fiber is used for adsorption recovery, so that the VCM content in the exhaust gas after the treatment reaches the national emission standard.
(12) Promote the three-stage absorption process for the production of synthetic hydrochloric acid to cure acidic wastewater.
(13) The use of precipitation, flocculation, absorption, incineration, biochemical treatment and other methods to treat "three wastes" such as carbon tetrachloride, ferric chloride, chloroform and other serious polluting products.
(1) The ion-membrane method shall be adopted for the new, expanded and modified caustic soda devices. It is forbidden to build a caustic soda production device with an annual output of 10,000 tons or less.
(2) In the production of caustic soda, the use of salt for washing should be actively used as a raw material instead of raw salt, so that the amount of salt sludge produced can be reduced from 40-50 kg per ton of caustic soda to 15-20 kg.
(3) Reform the brine purification process, and use multiple measures such as water washing and sedimentation pressure filtration to treat the salt mud, so that the NaC1 contained in the salt mud is reduced to 1-2 g/L. The washing water is reused in the salting process, and the salt mud is comprehensively used or properly stored.
(4) The existing diaphragm method is used to produce asbestos waste water discharged from caustic soda equipment. Gravity sedimentation vacuum suction filtration or centrifugal filtration is used to recover asbestos as much as possible, and the asbestos lining in waste water is reduced from 3-8 g/L. 0.2-0.3g/L.
(5) The newly-built and expanded PVC units should be located as close as possible to the ethylene production site, or economically viable to divert ethylene dichloride and vinyl chloride, using ethylene oxychlorination. Areas where electricity prices are cheap can adapt to market competition and acetylene can also be used.
(6) The construction of open type calcium carbide furnaces and calcium carbide furnaces with an annual output of 10,000 tons or less is prohibited.
(7) Closed-type calcium carbide furnaces newly built or expanded must adopt advanced technologies and equipment such as mature furnace gas purification and dry dust removal, and be equipped with waste heat utilization devices to prevent dust and furnace gas pollution.
(8) Existing large-scale open type calcium carbide furnaces should be fully converted to closed type calcium carbide furnaces before 2005, using domestic mature gas purification and dry dust removal technologies, recycling furnace gas as fuel or comprehensive utilization of waste heat.
(9) Mercury-containing waste water produced by the acetylene process of vinyl chloride, using iron reduction method and legal carbon adsorption method to eliminate mercury pollution, and the mercury concentration after treatment reaches the national emission standard, and the pass rate reaches 100%.
(10) Treatment of calcium carbide wastewater is performed by oxidation or recycling. The treated wastewater is reused for production. After the calcium carbide slag is dehydrated, it is sent to the rotary kiln for calcining lime to be used for the production of calcium carbide, or used as cement and other building materials.
(11) In the process of rectification of vinyl chloride, a high concentration of VCM is discharged at the top of the tower (up to 30-50%), and the activated carbon fiber is used for adsorption recovery, so that the VCM content in the exhaust gas after the treatment reaches the national emission standard.
(12) Promote the three-stage absorption process for the production of synthetic hydrochloric acid to cure acidic wastewater.
(13) The use of precipitation, flocculation, absorption, incineration, biochemical treatment and other methods to treat "three wastes" such as carbon tetrachloride, ferric chloride, chloroform and other serious polluting products.
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