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Secondary Battery Na₂SO₄ Wastewater Treatment Methods

Secondary Battery High-Concentration Na₂SO₄Wastewater Treatment Process

The hydrometallurgical process is widely applied in the secondary battery industry, primarily using sulfuric acid, which requires 18 to 20 times more industrial water compared to the general manufacturing industry.
Additionally, the smelting process, which involves the use of caustic soda, produces a salt component known as sodium sulfate (Na₂SO₄).
The resulting contaminated water discharged by the processing company is commonly known as Na₂SO₄ wastewater.

Commercially viable desalination technologies for treating high-concentration Na₂SO₄ wastewater from the secondary battery industry include thermal
techniques, ion exchange, and membrane techniques. Their respective pros and cons are outlined below.

Sortation Thermal Techniques Ion Exchange Membrane Techniques
Pros
  • Simple pretreatment
  • Offers the same efficiency tregardless
    of raw water quality
  • Effective desalination
  • Modular design allows for easy expansion.
  • Low energy consumption compared
    thermal technique
Cons
  • High energy consumption
  • Hot drainage occurrence
  • Incurs costs for the recycling of resin
  • Reduced processing efficiency in the presence of particulate matter
  • High maintenance costs for membranes
  • Generation of high-concentration "Salt" waste
Charact
eristics
  • Erosion of market share
  • Recent upward trend

KARI's technology removes heavy metals from highly concentrated brine wastewater generated during the production of secondary battery electrode materials through catalysis. It also enables the removal of salts via crystallization to produce clean treated water with an ecotoxicity level of 1 or less,
which is then recycled for industrial use. Additionally, the byproducts are recovered and recycled from the brine wastewater.
The process is as follows:

Pields Engineering and KARI have signed an agreement to collaborate on the brine wastewater treatment facility project,
leveraging eco-friendly technologies focused on 'the utilization of wastewater resources.’
This collaboration project will utilize Pields Engineering's technical services, EPC capabilities, and experienced personnel.

Technical Services from Pields Engineering

  • step1

    Process Design

  • step2

    Factory Renovations

  • step3

    Feasibility Studies

  • step4

    Commissioning Support

Benefits of Pields Engineering

  • Minimizes the overall project schedule through the quick application of a proven design package that covers everything from basic design to material supply and construction, leveraging experience as an EPC veteran in Green New Deal projects.
  • The rapid deployment of experienced personnel and the use of standardized designs, materials, and construction methods helps reduce costs and time.
  • Has extensive experience in designing and constructing facilities for producers of large-scale secondary battery anode material precursors.