Recently held in Beijing in 2016 China's oil and chemical industry environmental protection technology and equipment supply and demand negotiations, assembled a large number of petrochemical industry environmental technology and equipment. During the exchange of deputies, the reporter found that the issue of environmental protection in coal chemical industry was also the focus of the meeting. Reporter learned at the meeting, the delegates in addition to coal chemical industry environmental technology are interested, but also the current problems in the field of environmental protection and future environmental trends showed great concern.

Rejoicing: There are successful precedents for the utilization of miscellaneous salt

Difficult to deal with high concentrations of salt water has become a major heart disease in the chemical industry, especially for coal chemical industry. The crystallization salts (mixed salt) produced by the evaporation and crystallization of high-concentration brine of coal chemical industry are currently classified as hazardous and their disposal problems not only bring heavy economic burden to the enterprise, but also are limited by the receiving capacity of the local hazardous waste disposal center .

According to the situation to be met by Liu Zhixue, assistant director of petrochemical light textile evaluation department, to the MEP's EIA Center, step-by-step crystallization of miscellaneous salt is technically feasible, but lack of engineering verification. In the high-salt water treatment unit, various related technologies are applied at present, but the performance of stable operation is small. He believes that in this area still need to further screening of core technologies, based on the experimental verification and optimization of integration, to explore new salt reduction, recycling of new ways.

However, at the meeting, the reporter heard such a promise: "We can promise that owners: Apply our high-salt chemical waste water quality and salt-based zero-emission technology, not only to ensure that the quality of salt reached the relevant national standards, but also to ensure that the solution to the quality Salt place. "This commitment immediately aroused great concern delegates. In this interview, the reporter interviewed Xue Yuan, deputy general manager of Inner Mongolia Long Branch Kangrui Environmental Protection Technology Co., Ltd. (referred to as long Branch).

Xue Yuan revealed a message: using their technology, Inner Mongolia Erdos Qipanjing Industrial Park, salt-free wastewater high salt zero discharge EPC project is the current domestic high-salt wastewater zero discharge project to the quality of salt crystallization of the use of resources Complete and officially run the only project case! Reporter to learn more about him, in order to make the technology as soon as possible industrialization, the enterprise first in the Ordos Group Qipansi Industrial Park, construction of high salt industrial wastewater zero salt zero discharge medium equipment verification project, the use of the original daily handling capacity of 30,000 Ton of sewage treatment plant based on the conditions of the complex high-salt wastewater from the park for advanced treatment and recycling.

The high-salinity wastewater is mainly treated by high-density pool, V-type filter, ultrafiltration, reverse osmosis, ion exchange resin and continuous high pressure nanofiltration. The wastewater is mainly divided into monovalent salt (sodium chloride) and divalent salt Sodium) as the main two kinds of water body, and then by advanced oxidation technology to remove the chemical oxygen demand of wastewater digestion, into the disc tube type reverse osmosis (DTRO) device enrichment, and finally multi-effect evaporation to obtain a crystalline salt, water Into the water reuse pipe network for Ordos Power Plant reuse, non-concentrated water and solid waste emissions. The project was designed to have a capacity of 10 t / h. The unit was put into operation on June 20, 2014. The total dissolved solids (TDS) of the influent water was about 8000 mg / l, with a total continuous and stable operation of more than 5 months. The overall water recovery rate is greater than 97%, direct operating costs of only 9.66 yuan / ton of water (excluding financial costs and depreciation costs).

Immediately afterwards, the company also set up a pilot project with a designed capacity of 3.5 tons / hour for the wastewater from the Yitai Coal-to-Oil Project in Inner Mongolia. The unit has been in formal operation since early August 2015 and has operated continuously for more than three months in a row. The overall water recovery rate is more than 95%. The direct operation cost is 10.57 RMB / tonne (without considering the depreciation and finance costs) "Open recirculating cooling water system make-up water" standard stipulated in "Industrial Wastewater Reclamation Standard for Industrial Wastewater" (GB / T19923-2005). The project successfully produced sodium chloride and sodium sulfate products. After testing, the product fully in line with "sodium chloride sun industrial salt two" standard and "anhydrous sodium sulfate first-class product" standard.

National inorganic salt product quality supervision and inspection center of the salt after drying test results are: sodium chloride purity of 99.5%, 99.7% purity of sodium sulfate. The remaining 0.5% of the industry concerned, but also in line with relevant national standards.

Now, the company is building the first project case - the EPC project of Salt and Sulfate Emissions and Recycling of High-salt Industrial Wastewater in Qipansijing Industrial Park in Erdos, Inner Mongolia with a design scale of 10,000 tons / day and officially started in September 2014 Started construction, in March 2015 formal water running. Up to now, the first phase of the project (the processing flow until the thickening of the disc-type reverse osmosis unit) has been continuously and stably operated for nearly one year, the overall water recovery rate is more than 95%, the water production reaches the reuse water standard, and the direct operation cost is only 10 yuan / About tons of water. It is estimated that the second phase of evaporation and crystallization will be completed and put into operation this year.

Xueyuan also has its own unique answer to the problem of resource-based salt classification: For sodium chloride, hydrogen and chlorine can be used for the production of polyvinyl chloride. At the same time, the generated sodium hydroxide can be used in glass and papermaking , Textile, printing and dyeing industries; for sodium sulfate, on the one hand can be used for the production of potassium sulfate compound fertilizer, while the sodium sulfide can be produced for the production of high value polyphenylene sulfide.

The success of salt separation is not only a long time a family. Reporter learned at the meeting, other technologies used to separate salt also made gratifying progress -

Guo Fushan, deputy director of the Environmental Protection Research Institute of Fushun Petrochemical Research Institute of Sinopec recommended a near-zero emission combination technology developed independently.

First, the super-reverse osmosis concentrated + positive osmosis membrane (MBC) + crystalline combination of technology: salt wastewater treatment using super-reverse osmosis concentrated so that the total concentration of soluble solids reached 5% to 10%; and then into the osmosis membrane system Treatment, the concentrated solution of the total amount of dissolved solids further concentrated to 20% to 25%, to reach the conditions of the mold, through the crystallization of zero emissions. The combined process maximizes non-phase-change high concentration of salt-containing wastewater without the need for an evaporation system to achieve zero emissions.

The second is the super-reverse osmosis concentrated + steam mechanical compression (MVR) + crystallization combination process: salt water wastewater treatment by super-reverse osmosis, so that the total concentration of soluble solids reached 5% to 5.5%; and then sent to the steam mechanical compression device The total amount of dissolved solids in the concentrate was further concentrated to 15% by circulating evaporation, sent to a crystallizer and crystallized by addition of salt.

The combined process minimizes the volume of salty wastewater by adopting ultra-concentrating technology, and then economically achieves zero emissions through relatively energy-efficient steam-mechanical compression technology.

By the French Veolia company designed Hainan Jinhai Pulp and Paper Co., Ltd. black liquor evaporation black liquor black liquor evaporation and sodium sulfate crystallization device can be separated by different crystallization points different ions, the unique elutriation of impurities patented technology and impurities Remove. The black liquor and coal chemical high salinity water quality similar to the promotion of the current coal chemical industry has strong reference significance.

Beijing State Power Futong Science and Technology Development Co., Ltd. Miscellaneous Salt Purification test, it is through the bottom of the evaporation crystallizer salt to achieve the initial purification. Crystallization out of the salt crystal, due to the downward movement of gravity, gradually falling from the cone to the salt, salt, salt (washing) into the lower part of the salt from the leg along the leg up and salt countercurrent washing washed nitrate , Chemical oxygen demand and other impurities removed, improve the quality of crystalline salt.

Shanghai East Shuo Environmental Technology Co., Ltd. crystallization salt pilot using AOP Advanced Catalytic Oxidation + ED ion membrane concentration process + crystallization salt separation process, the isolated sample of primary sodium salt content of 95.11% sodium chloride, secondary crystallization salt sodium chloride content 93.76%.

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October 05, 2021