China Drying Network News China National Petroleum & Chemicals Survey and Design Association, China National Petroleum Corporation Nanjing Engineering Co., Ltd. and other units led the preparation of the national standard "Sulfuric Acid, Phosphatic Fertilizer Industrial Wastewater Treatment Specification" has been completed, is pending approval of the relevant departments. The original wastewater treatment design industry standards will be upgraded to national standards and will better regulate the design and management of water pollution in the sulfuric acid and phosphate fertilizer industry in China.
The waste water discharged from the sulfuric acid industrial production process is mainly the acid waste water produced by the purification of furnace gas, and it also includes desalinated waste water, equipment cooling water, boiler waste water, circulating cooling waste water, etc. The main pollutants are suspended matter, arsenic, fluorine, and sulfides. lead. “In recent years, the rapid development of the sulfuric acid and phosphate fertilizer industry has also increased the emission of water pollutants year after year.†said Jiang Shaojun, team leader of the new national standard and the senior engineer of the Nanjing Engineering Company of the China Petrochemical Corporation.
It is understood that with the advancement of sulfuric acid and phosphate fertilizer industry technology and stricter environmental protection requirements, the state has issued regulations in August 1997 after it promulgated the "Technical Regulations for Designing Wastewater from Sulfuric Acid and Phosphate Fertilizer Industry," such as the Ministry of Environmental Protection last March. The “Sulfuric Acid Industrial Water Pollutant Emission Standard†implemented on January 1, puts forward higher requirements for the industry's environmental protection work. However, this is only an emission standard. The relevant standard specifications are not perfect for the industrial wastewater treatment design field that involves the source of sewage.
To this end, in August 2010, the China Petroleum and Chemicals Survey and Design Association, the China Petrochemical Corporation, Nanjing Engineering Co., Ltd. as the chief editor unit, in conjunction with Donghua Engineering Technology Co., Ltd., China Wuhuan Engineering Co., Ltd., Qi Fu (Group) Limited The establishment team of the responsible company Phosphate Fertilizer Plant and other units was established; in December 2011, the “Sulfate and Phosphorus Fertilizer Industrial Wastewater Treatment Specification†completed the draft for review; in March 2012, the China Engineering Construction Standardization Association Chemical Branch and China Petroleum and Chemical Exploration The Design Association’s Water Supply and Drainage Design Professional Committee organized the review draft experts’ review; at the end of May this year, the approval draft was completed.
The newly revised national standards are divided into 12 chapters, including general principles, terminology, sewage treatment systems, sewage treatment processes for sulfuric acid and phosphate fertilizers, site selection and layout of sewage treatment stations (fields), major sewage treatment facilities, and pharmaceutical preparation systems. A series of key content. According to Jiang Shaojun, compared with the original industry standards, the new standard has three main highlights:
First of all, the special chapter of water saving and safety requirements is clearly reflected. The new national standard regulates water from general to specific sections and reduces the discharge of sewage from the design source. In order to prevent the waste water from being reused and reused in time, the treated effluent could not be used effectively. The new national standard requires that the sewage treatment station must be set back to the water tank to ensure that the water for reuse is adequate and the water quality is uniform.
"In addition to the emphasis on energy conservation and resources, the wastewater produced in the production of sulfuric acid and phosphate fertilizers is very acidic, and it is very easy to form strong corrosiveness on the internal components of the pool. In order to ensure the personal safety of the maintenance personnel, the new national standard requires equipment in the sewage treatment station. For buildings, pipelines, platforms, ladders and railings, we must use corrosion-resistant materials or adopt anti-corrosion coating protection. Compared with the old standard, we have separately set 'water saving, energy saving and environmental protection' and 'safety and sanitation' in the new national standard. 'Two chapters are to better implement the national energy-saving emission reduction, people-oriented policy requirements." Jiang Shaojun said.
Second, the new national standard represents the current level of advanced technology. The preparation team conducted research on the operation status of the sewage treatment devices for sulfuric acid and phosphate fertilizers in 7 representative domestic enterprises, and summarized the practical experience in the design of sewage treatment projects for sulfuric acid and phosphate fertilizer production in China, drawing lessons from chemical and metallurgical industries. Based on the current standards and the experience of sewage treatment of sulfuric acid and phosphate fertilizer plants imported from abroad, the original wastewater treatment design specifications were analyzed and revised.
"Effluent discharged from pyrite, for example, has an iron ion concentration of 40 to 50 mg/l. According to this situation, the standard stipulates that when the amount of arsenic contained in the sewage is less than 4 mg/l, the main factor is to remove fluoride. In addition to the elements containing arsenic and fluorine, the waste water or acid produced by the smelting of flue gas contains heavy metals such as copper, zinc, nickel, cobalt, etc. For this purpose, the standard stipulates that sulfur can be added to the sewage. Salts, in addition to arsenic removal, also achieved the recovery of heavy metals,†said Jiang Shaojun. “All these reflect the current state-of-the-art technology and the latest production trends in the treatment of sulfuric acid and phosphate fertilizers in China, and provide a strong technology for the discharge of standards. support."
Finally, there has been a significant increase in the systematicness and completeness of content. With regard to the phenomenon that many standards are repeated before and after the old standard, the new standard clearly stipulates that “the design specification should focus on the commonality of the system, and the design of each unit in the system is generally not repeated. All the provisions related to the system in the unit design specifications should be incorporated into the system. The "scope of design specifications" principle ensures stable operation of the sewage treatment plant.
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