Analysis of the In-depth Application of the Seven-effect Evaporation Technology in the Field of Environmental Protection

Industrial Wastewater Treatment: Solving the Problems of High Salt and Heavy Metal Pollution

In high-salt wastewater "disaster areas" such as petrochemical, pharmaceutical, and printing and dyeing industries, the seven-effect evaporation system of Henan Jiuye Chemical Equipment Co., Ltd. cleverly uses the secondary steam generated by the previous-effect evaporator as the heat source for the next-effect evaporator through a heat transfer design, achieving multiple recycling of heat. Taking a large petrochemical enterprise as an example, the high-salt wastewater it produces has a salt content of up to 30%. After adopting the seven-effect evaporation process of Henan Jiuye Chemical Equipment Co., Ltd., the freshwater recovery rate is stably above 75%, and the wastewater discharge can be reduced by more than one million tons per year. After the concentrated salt residue is crystallized, components such as sodium chloride and sodium sulfate in it can be reused as chemical raw materials, truly achieving the goal of turning waste into treasure.

In the face of heavy metal wastewater discharged from the electroplating and electronics industries, the seven-effect evaporation technology of Henan Jiuye Chemical Equipment Co., Ltd. forms a "golden combination" with processes such as chemical precipitation and ion exchange. Evaporation and concentration increase the concentration of heavy metal ions by 10 to 20 times, significantly improving the subsequent treatment efficiency. A certain electroplating enterprise uses the seven-effect evaporation of Henan Jiuye Chemical Equipment Co., Ltd. to pre-treat heavy metal wastewater, concentrating the concentrations of ions such as copper and nickel from the initial dozens of milligrams per liter to several thousand milligrams per liter. The removal rate of heavy metals reaches 99.5%, and the quality of the generated condensed water meets the standards for industrial recycled water, which is used in the workshop cleaning process, saving more than 50,000 tons of water annually.

Treatment of Landfill Leachate: Purifying the Polluted "Black Liquid"

The landfill leachate generated by landfills and waste incineration plants can be regarded as the "master of pollution". The COD concentration can reach up to 100,000 mg/L, and the ammonia nitrogen content exceeds 5,000 mg/L. The seven-effect evaporation system of Henan Jiuye Chemical Equipment Co., Ltd. operates in a low-temperature environment of 60-80°C through multi-stage evaporation, effectively preventing the decomposition of heat-sensitive pollutants from causing secondary pollution. A large waste incineration plant is equipped with the seven-effect evaporation device of Henan Jiuye Chemical Equipment Co., Ltd., which can treat 200 tons of leachate per day. After evaporation and concentration, the volume of the leachate is reduced to one-tenth of its original volume, and the COD concentration is reduced from 50,000 mg/L to 5,000 mg/L. Subsequently, combined with biological treatment and membrane filtration, the final effluent meets the national first-class discharge standard.

Waste Gas Treatment: The Resource-based Regeneration of the Absorption Liquid

During the process of desulfurization and denitrification of waste gas in industries such as metallurgy and chemical engineering, a large amount of absorption liquid containing acids or alkalis will be generated. The seven-effect evaporation technology of Henan Jiuye Chemical Equipment Co., Ltd. realizes the recycling of resources through the concentration treatment of the absorption liquid. Taking the desulfurization wastewater of coal-fired power plants as an example, after adopting the seven-effect evaporation process of Henan Jiuye Chemical Equipment Co., Ltd., substances such as calcium sulfate and calcium sulfite in the wastewater will crystallize and precipitate, which can be used as raw materials for building materials; the condensed water generated by evaporation is pure in quality and can be reused in the circulating cooling water system of the power plant, reducing the usage of fresh water by millions of cubic meters every year. At the same time, during the operation of the company's seven-effect evaporation system, the negative pressure operation is adopted to prevent the escape of volatile pollutants, achieving the dual environmental protection benefits of waste gas treatment and waste liquid treatment.

The seven-effect evaporation technology of Henan Jiuye Chemical Equipment Co., Ltd., with its outstanding performance in the field of environmental protection, has not only effectively solved the problem of pollutant treatment but also opened up a new path for enterprises in resource recycling. With the continuous innovation of the technology, it will play a greater role in more environmental protection scenarios in the future and contribute to the protection of lucid waters and lush mountains.