High-salt wastewater refers to wastewater containing high concentrations of salt compounds. These salts can include chlorides, sulfates, nitrates, etc. High-salt wastewater usually comes from some industrial processes, such as salt chemical industry, electroplating, leather processing, textile printing and dyeing, etc. The chemicals and production processes used in these industrial activities may lead to increased salt concentrations in wastewater.
High-salt wastewater has some environmental and ecological problems, because excessive salt can have a negative impact on aquatic ecosystems and soil. The discharge of high-salt wastewater into natural water bodies may cause water pollution, harm aquatic organisms, and affect the ecological balance. In addition, if high-salt wastewater is discharged directly into the soil, it may cause soil salinization, affecting plant growth and soil quality.
Treating high-salt wastewater is an important environmental protection task. According to statistics, high-salt wastewater accounts for about 5% of the total wastewater discharged in the chemical production process. Because of its complex composition, difficulty in treatment and serious impact on the environment, how to effectively solve the problem of zero discharge of high-salt wastewater has become an important governance problem faced by today’s production enterprises.
Common treatment methods for zero discharge of high-salinity wastewater include membrane separation, MVR and multi-effect evaporation technologies. Through these technologies, the salt concentration in the wastewater can be reduced so that the wastewater meets the environmental discharge standards.
Membrane separation, MVR and multi-effect evaporation
1. Membrane separation technology
Processing characteristics of membrane separation technology:
Ultrafiltration (UF): remove large molecular organic matter and suspended matter.
Nanofiltration (NF): partially remove small molecular organic matter and ions.
Reverse osmosis (RO): remove most soluble salts and organic matter.
2. Mechanical vapor recompression (MVR)
Processing characteristics of MVR:
High efficiency and energy saving: use the latent heat of steam for multiple evaporations.
Applicable to high-concentration wastewater: can treat high-concentration organic wastewater.
3. Multi-effect evaporator (MED)
Processing characteristics of multi-effect evaporator:
Multi-stage evaporation: reduce energy consumption and improve efficiency through multi-effect evaporation.
Wide range of application: applicable to various types of industrial wastewater.
In order to achieve efficient disposal of wastewater at the back end of membrane system, MVR and MED evaporator, efficient low-temperature evaporation technology can be used. By combining low-temperature evaporation process with membrane, MVR/MED evaporation process, hazardous wastewater can be evaporated and desalted, giving full play to the advantages of each process, so that the evaporation device can operate for a long period of time, and the comprehensive energy consumption is low. Practice has shown that this combined process is an ideal physical and chemical pretreatment technology for high-salt, high-COD hazardous wastewater.
Introduction to low-temperature evaporation and drying technology
Low-temperature evaporation crystallization drying technology is specially used for aqueous solutions concentrated by evaporator reduction, with a built-in spiral stirring system to handle concentrated liquids that are easy to stick to the wall. It is especially recommended for treating sticky or crystallized fluids, such as high-concentration oily wastewater, heavy metal wastewater, printing industry wastewater, high-salt water, brackish water, reverse osmosis concentrate, etc.
3. Advantages of low-temperature evaporation crystallization drying technology
① Evaporation at room temperature is not easy to produce scale;
② The high-efficiency vacuum jet system designed by intensive experiments has continuous water discharge, low maintenance cost and low noise;
③ The steam spiral filtration system, with built-in steam purification device and reflux structure, can remove more than 95% of free organic matter and free water, and the outlet heavy metal is zero. The outlet COD is 70% higher than the traditional low-temperature evaporator before iteration, and the outlet water quality is better and more transparent. The outlet water quality is better;
④ The equipment is simple to operate, with a humanized operation interface and guided design (parameter setting, troubleshooting, maintenance reminders, etc.). Operators only need to follow the steps to complete;
⑤ The Alibaba Cloud platform APP monitoring program can be installed on the user’s mobile phone and computer, which is easy to use and has no operation threshold;
⑥ No buffer tank, direct liquid crystallization treatment;
⑦ The spiral discharge system can perform deep crystallization and discharge dry solid materials.
Winsonda has devoted itself to R&D and innovation for many years. It currently has more than 150 authorized patents and focuses on the development of low-temperature evaporation technology. It can professionally undertake the treatment of industrial high-concentration wastewater in the fields of coal chemical industry, fine chemical industry, hazardous waste, electroplating and mechanical processing, with more than 600 classic cases nationwide. Focusing on customer needs, Weishengda can provide customers with customized wastewater treatment services, including a full-chain comprehensive service system from working condition investigation, media analysis, pre-sales technical support, R&D and manufacturing, installation and commissioning, delivery, after-sales support to continuous tracking.
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