PVA Recovery

PVA (Polyvinyl Alcohol) is a common synthetic sizing agent, used for treatment of cotton or synthetic fabrics. It is typically washed out in the desizing process using hot water at 80-85°C (175-185°F).

The Challenge

Spent PVA solution is high in organic matter; it contains 1-1.5% PVA, starch and salts. If sent to the wastewater treatment facility, PVA precipitates upon cooling to ambient temperature, causing clogging of pipes and costly treatment process.

system

The Solution - KMS PVA Recovery Systems

With many years of experience of our R&D scientists and process engineers, KMS possesses the necessary expertise to develop a spiral membrane element that can operate at the harsh conditions of textile desizing process. We have developed and implemented successfully an optimal pore size ultrafiltration membrane, capable of operating at 85°C (185°F) continuously and reliably.

Our PVA recovery systems effectively concentrate PVA solution from 1 to 10%. At 8-10% PVA, the product stream is ready to be sent back to the sizing process for reuse, without further treatment.

Benefits of PVA Recovery Process Using Membranes

  • Reduced PVA spending
  • Significant reduction of COD, up to 90%, from waste desizing solution sent to the wastewater treatment plant
  • Heat energy savings on recovered PVA