On June 15th, Zhejiang Jinju Chemical Co., Ltd. disclosed that the difficult problem of ultra-high concentration wastewater treatment that has been plaguing chemical production was successfully solved by the company. At present, this technology, which is applicable to the comprehensive utilization of ultra-high concentration wastewater from coal-water slurry gasification plants, has been patented by the State Intellectual Property Office.

According to Fang Linmu, chief engineer of Zhejiang Jinju Chemical Industry Co., Ltd., this comprehensive utilization technology of wastewater resources has two major features: First, it turns waste into treasure through beneficial treatment, and it can use chemical oxygen demand (COD) and ammonia nitrogen content. Ultra-high-concentration sewage with no upper limit is fully incinerated through high temperature and converted into valuable resources such as hydrogen, nitrogen, and carbon monoxide. Every year, 30,000 tons of ultra-high-concentration wastewater can be recycled and used as an important raw material for the production of urea and co-produced methanol. The chemical production of ultra-high concentration of sewage treatment of the blank; second is suitable for 20 MPa ~ 80 MPa coal-water slurry pressure gasification device, has a relatively simple process, etc., to improve the coal chemical industry clean production levels and raw materials, The efficiency of energy use has a good prospect of promotion and application in the industry.

At present, the gasification coal-water slurry production plant that carries this technology has a daily processing capacity of more than 90 tons of ultra-high-concentration sewage, with a treatment rate of 100%, and a significant energy conservation and emission reduction effect.

According to reports, in order to effectively solve the problem of ultra-high concentration chemical wastewater treatment, the company has conducted in-depth research on the feasibility of continuous operation of gasification coal slurry plant. Organizational engineering and technical personnel have conquered the gasification coal coal with weak adaptability and operation. The problem of small elasticity, and based on the characteristics of high-temperature incineration in the gasifier, innovatively proposed a new technology for the development of high-concentration wastewater instead of Qingjiang water configuration coal-water slurry feedstock. After nearly a year of repetitive exploration, research, and transformation of the production process, production equipment, and operating modes, the gasification plant was successful in April this year. The assessment results of the plant operation show that any wastewater containing ultra-high concentration of ammonia nitrogen and COD pollution factors can be “dried and dried”. The annual electricity consumption can be reduced by 1 million kwh, the water consumption can be reduced by 100,000 tons, and the overall energy consumption can be reduced by 10 %.

In the production process of synthetic ammonia, various high-concentration wastewaters, which are difficult for the wastewater treatment plant to deal with, are inevitably generated. The environmental pressure of the enterprises is enormous. Taking Jinju Company as an example, once the gasification unit is eliminated, the air separation unit that supplies oxygen with it will empty 5,300 cubic meters of oxygen per hour, which will cause the company to stop production due to high energy consumption and high cost, and then two sets of value. More than 60 million yuan of equipment will also be scrapped.

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