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Recycling of cleaning solutions

CIP Recovery Unit

With repeated use, cleaning solutions (mainly sodium hydroxide at 2-4%) become loaded with impurities, such as proteins, sugars and colorants, and must be changed. However using nanofiltration from GEA, these solutions can be cleaned and regenerated for continued use, saving money and avoiding disposal.

CIP recovery unit top

The regeneration of these CIP solutions is achieved using membrane filtration at the normal operating temperature of the fluid (up to 70 °C). The contaminated CIP solution is fed to the main storage tank via ultrafiltration (UF) operating in a bypass system.  This removes suspended colloidal impurities.

In many cases, CIP solutions can be directly treated in a nanofiltration (NF) system to remove color and low-molecular weight impurities. This concentrates the impurities in the contaminated solution in the retentate allowing the purified caustic solution permeate to pass through at the same concentration and temperature as the feed.

Benefits and advantages

  • Reduced chemical loss saves money and extends application intervals;
  • Lower cost for neutralizing waste waters;
  • Reduced energy costs (high-temperature filtration);
  • Plug & Play design for easy implementation into existing CIP systems;
  • Standardized modular design to reduce investment costs and improve the return on investment.

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