Separation of Hydrate and Salt from Chemical Fiber Wastewater

【Project Overview】

This project presents an innovative resource recovery solution for industrial saline waste acid. At its core, it employs an electrodialysis process for the continuous treatment of pretreated feed water with a substantial flow rate of 50 m³/h. This technology utilizes an electric field to drive the highly selective and directional migration of acid components (e.g., H⁺ ions), enabling the effective separation and recovery of acid from the wastewater.

The process delivers value through two key mechanisms:

Acid Recovery & Wastewater Minimization: On the de-acidified side, the produced water volume remains largely unchanged while its acidity is significantly reduced, allowing it to be fed directly into downstream membrane systems for advanced treatment. This substantially reduces the load and cost for subsequent processes right from the source. On the receiving solution side, the system stably produces regenerated acid with a concentration of approximately 60 g/L, with the potential to be increased to 80-90 g/L, achieving highly efficient resource recovery.

Salt Conversion & Closed-Loop Cycling: The system can efficiently process specific salt solutions, such as sodium nitrate, directly splitting and regenerating them into higher-value nitric acid and sodium hydroxide. This not only completely resolves the challenge of treating high-nitrate wastewater but also transforms waste into production feedstock, establishing an internal resource cycle for the enterprise and significantly reducing reliance on external chemical raw materials.

The successful implementation of this project undertaken by Create provides an economical, environmentally sound, and sustainable integrated pathway for treating high-salinity, high-acidity wastewater, strongly promoting the green and low-carbon transformation of related industries.

【Project Highlights】

• Targeted Acid Recovery for Cost Reduction & Efficiency Improvement
  The project precisely separates and recovers acid solution at high concentrations up to 60 g/L via electrodialysis. The recovered acid can be directly reused in the production process, significantly reducing the enterprise's high costs for purchasing fresh acid and disposing of waste acid, achieving a fundamental shift from "pollution control" to "value creation."
• Source Reduction & Load Mitigation Optimizes Full-Process Cost
  The de-acidified wastewater exhibits significantly reduced acidity with unchanged volume, enabling direct entry into subsequent treatment stages. This approach alleviates the treatment burden and scaling risk for downstream membrane concentration and evaporation crystallization units right from the source, optimizing the design and operational costs of the entire water treatment system.
• Salt Splitting & Regeneration Technology Disrupts Traditional Disposal Models
  It breakthrough directly converts waste like sodium nitrate into nitric acid and sodium hydroxide, achieving a closed-loop cycle from "waste-to-resource." This technology not only solves an environmental challenge but also creates new economic value, representing a major breakthrough in resource recovery technology.
• Large Scale & Promising Potential Demonstrate Strong Industrial Application Value
  With a system treatment capacity of 50 m³/h, the project proves the reliability and maturity of this technology in large-scale, continuous industrial production scenarios. Furthermore, the potential to increase the produced acid concentration to 80-90 g/L provides flexibility to meet higher-concentration reuse requirements.