** Phosphate fertilizer industry sewage treatment plan

The business club reported on July 19 that “the technical regulations for the treatment of waste water in the treatment of phosphate fertilizers (HG/T20590-97), currently in force in China, were introduced more than ten years ago and are industry standards. Can not adapt to the current level of technology and high standards of environmental protection requirements." Han Ling, chairman of the China Water and Drainage Design Professional Committee, told reporters.

Thankfully, the reporter learned from an interview last week that the national standard “**, Code for the Treatment of Industrial Wastewater from Phosphatic Fertilizers” led by the China Petroleum and Chemicals Survey and Design Association and the China National Petrochemical Corporation Nanjing Engineering Co., Ltd. has been completed. Is waiting for approval from the relevant authorities. The original sewage treatment design industry standards will be upgraded to national standards and will better regulate the design and treatment of water pollution in the country's ** and phosphate fertilizer industries.

**Effluent discharged from the industrial production process is mainly acidic wastewater generated from the purification of furnace gas, as well as desalinated wastewater, equipment cooling water, boiler sewage, and circulating cooling wastewater. The main pollutants are suspended solids, arsenic, fluorine, and fluoride. And lead. “In recent years, while the rapid development of the phosphate fertilizer industry, the discharge of water pollutants has also increased year by year,” said Jiang Shaojun, team leader of the new national standard and the senior engineer of the Nanjing Engineering Company of the China National Petrochemical Corporation.

It is understood that with the progress of the technology and the strict environmental protection requirements of the **, phosphate fertilizer industry, after the “** and Phosphate Industrial Wastewater Treatment Design Technical Regulations” was promulgated and implemented in August 1997, the state has successively issued regulations, such as the Ministry of Environmental Protection last year. The “** Industrial Water Pollutant Emission Standard” implemented from March 1st puts forward higher requirements for environmental protection work in this industry. 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 company was headed by the China Petroleum and Chemicals Survey and Design Association and Sinopec Nanjing Engineering Co., Ltd., together with Donghua Engineering Science and Technology Co., Ltd., China Wuhuan Engineering Co., Ltd., and Qifu (Group) Co., Ltd. The establishment team of the responsible company Phosphate Fertilizer Plant and other units was established; in December 2011, the “**, Phosphorus Fertilizer Industrial Sewage Treatment Code” completed the review draft; in March 2012, the China Engineering Construction Standardization Association Chemical Branch and China Petroleum and Chemical Industry The Water Supply and Drainage Design Professional Committee of the Survey and Design Association organized experts for the review draft; at the end of May this year, the draft was submitted for completion.

The reporter learned that the newly revised national standard is divided into 12 chapters, including general principles, terminology, sewage treatment system, **, phosphate fertilizer production sewage treatment process, sewage treatment station (field) location and layout, sewage treatment facilities , pharmaceutical preparation system and 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 amount of water for reuse is sufficient and the water quality is uniform.

"In addition to the emphasis on energy conservation and resources, due to the strong acidity of the sewage produced in the production of phosphate fertilizers, it is very easy to form strong corrosiveness on the internal components of the pool. To ensure the personal safety of the maintenance personnel, the new national standard requires the sewage treatment station. Equipment, structures, pipelines, platforms, ladders, and railings must be made of corrosion-resistant materials or anti-corrosion coatings. Compared to the old standard, we have separately set 'Water Saving, Energy Saving and Environmental Protection' and 'Safety and Safety' in the new national standard. The 'two chapters of health' is to better implement the national energy-saving, emission-reduction and people-oriented policy requirements, said Jiang Shaojun.

Second, the new national standard represents the current level of advanced technology. The reporter learned that the team has conducted surveys on the operation status of the ** and phosphate fertilizer production wastewater treatment plants in seven representative domestic enterprises, and summarized the practical experience in the design of sewage treatment plants in China, and phosphate fertilizers, and used them as reference. Based on the current standards in the chemical and metallurgical industries, as well as the experience in the treatment of sewage from ** and phosphate fertilizer plants imported from abroad, the original wastewater treatment design specifications were analyzed and revised.

"For example, in sewage discharged from iron ore as raw material, the iron ion concentration is 40-50 mg/l. According to this situation, the standard stipulates that when the arsenic content in sewage is lower than 4 mg/l, In addition to the elements containing arsenic and fluorine, the waste water or acid produced from smelting flue gas contains heavy metals such as copper, zinc, nickel, and cobalt. Salts, so that the removal of arsenic also realized the recovery of heavy metals.” Jiang Shaojun said, “All of these reflect the current state-of-the-art technology and latest production trends of phosphate fertilizers in China, and provide powerful Technical Support."

Finally, there has been a significant increase in the systematicness and completeness of content. In response to the phenomenon that many old standards repeat before and after, the new standard clearly stipulates that “the design specification should focus on the commonness 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.

"Phosphorus resources are both valuable resources and one of the main factors for the eutrophication of water bodies. The new national standard will help to reduce the release of phosphorus from the phosphate and phosphate industries and enhance the recycling of phosphorus resources. At the same time, the standard also takes into account arsenic , fluorine, heavy metals, acidic sewage treatment. During the "Twelfth Five-Year Plan", China's **, phosphate fertilizer industry will stand on a new starting point for healthy and harmonious development." Han Ling said.