Liquid crystal display unit wastewater treatment project

Project Name: Wastewater treatment Project for Sodium Chloride and Sodium Bromide in Liquid Crystal Display Units

 

 

Evaporation capacity: 3.5t/h and 2.5t/h for the two systems respectively

 

 

Evaporation process: Two sets of three-effect forced circulation tubular evaporation systems

 

 

Treatment object: Wastewater containing sodium chloride and sodium bromide

 

 

Final concentration: Crystallization

 

 

Main material: TA2 (titanium alloy)

 

 

Project Background

A certain liquid crystal display unit has generated a large amount of wastewater containing sodium chloride and sodium bromide during the production process. This type of wastewater is highly saline and corrosive. Traditional treatment methods are energy-intensive and inefficient, making it difficult to meet modern environmental protection requirements. In order to achieve efficient wastewater treatment and resource recovery, while reducing operating costs, the unit has introduced two sets of three-effect forced circulation tubular evaporation systems and selected TA2 titanium alloy as the main material to ensure the corrosion resistance and operational stability of the equipment.

 

 

Process flow

• Pretreatment: Sodium chloride and sodium bromide wastewater first undergo pretreatment to remove suspended solids, large particle impurities and some organic matter, adjust the pH value, and ensure the stability of the subsequent evaporation process.

 

 

• Three-effect forced circulation evaporation: The pre-treated wastewater enters the three-effect forced circulation tubular evaporation system.

 

 

• First-effect evaporation: Raw steam enters the first-effect heater to heat and evaporate the wastewater, and the secondary steam generated enters the second-effect.

 

 

• Second-effect evaporation: The secondary steam continues to heat the wastewater in the second-effect heater, further concentrating the solution. The generated steam then enters the third-effect.

 

 

• Triple-effect evaporation: Triple-effect evaporation uses low-temperature steam to continue evaporating wastewater, causing sodium chloride and sodium bromide to reach a supersaturated state and crystallize and precipitate.

 

 

• Forced circulation: Through the action of the forced circulation pump, it ensures that the material liquid is uniformly heated in the evaporator, avoiding local overheating or scaling problems.

 

 

Crystallization and separation: After crystallization, the salt is separated by centrifugation or filtration to obtain high-purity sodium chloride and sodium bromide crystals, which can be recycled as industrial raw materials.

 

 

• Condensation and recovery: The condensate water generated during the evaporation process is treated and reused in production, achieving the recycling of water resources and reducing wastewater discharge.

 

 

Technical advantage

• High efficiency and energy conservation: The three-effect evaporation process significantly reduces energy consumption by repeatedly utilizing the residual heat of steam. Compared with the traditional single-effect evaporation process, its energy-saving effect can reach 30% to 50%.

 

 

• Forced circulation design: Through the action of the forced circulation pump, it ensures that the material liquid is uniformly heated in the evaporator, avoiding local overheating or scaling problems, and improving the operational efficiency and stability of the equipment.

 

 

• Strong corrosion resistance: The main body is made of TA2 titanium alloy, which has excellent corrosion resistance and can effectively resist the corrosion of sodium chloride and sodium bromide wastewater, thus extending the service life of the equipment.

 

 

• High degree of automation: Equipped with an advanced automatic control system, it realizes full-process automatic monitoring and operation, ensuring the stability of the production process and the consistency of product quality.

 

 

• Significant environmental benefits: By condensing and recovering secondary steam, wastewater discharge is reduced, meeting environmental protection requirements.

 

 

Application field

The three-effect forced circulation tubular evaporation system is widely used in fields such as chemical engineering, electronics, and environmental protection, and is particularly suitable for the treatment of high-salt wastewater and resource recovery.