Define the quality to be recovered
Separate alkaline solutions by process, strength and contamination. Do not blend a lightly contaminated caustic stream with incompatible waste merely to increase project volume. Identify the limiting soil: particles, fat, proteins, colour and dissolved substances can require different cut-offs and quality checks.
Conductivity alone does not measure active caustic because other salts contribute to the reading. Request an alkalinity determination suitable for the formulation and operating conditions. If detergent additives are present, specify which components need to remain and how their continued function will be assessed after filtration.
Test separation and chemical function separately
Select a membrane and assembly compatible with concentration, temperature and cleaning exposure. Measure feed, permeate and retentate throughout concentration rather than testing only the first filtrate. Inopor documents CIP recovery applications, but performance from other projects is not a guarantee for the stream being assessed.
Compare cleaning with recovered solution against the established reference procedure using criteria agreed with production and quality personnel. Low turbidity does not establish removal of residues that govern hygiene or product quality. Any disinfection or hygienic validation belongs explicitly in the trial protocol and process scope.
Balance water, useful caustic and salts
Calculate useful caustic mass in each stream from volume, density and concentration on a consistent basis. A weight-percent balance requires density; litres multiplied by an unconverted percentage are insufficient. Include make-up, final bleed and liquor held in piping and modules when assessing the complete campaign.
Track salts and substances that pass into permeate and can accumulate through repeated reuse. A bleed or renewal is required where their concentration limits cleaning duty. Volume recovery and useful chemical recovery are different indicators and should be reported separately in the economic comparison.
| Indicator | What it establishes |
|---|---|
| Recovered compliant volume | Reusable water within the agreed specification |
| Useful alkalinity mass | Chemical available for cleaning |
| Permeate contaminants | Quality and accumulation limits |
| Cleaning test results | The service that must actually be preserved |
Compare complete cost over repeated cycles
Include circulation energy, heat, membrane cleaning, analysis, chemical make-up and retentate management. If heat recovery is intended, assess losses during storage and filtration. A presumed saving in cleaning chemical should not omit the cost of keeping the recovered circuit suitable for its intended reuse.
Agree repeated-cycle acceptance covering chemical quality, sustainable flux, equipment cleaning and recovered-CIP effectiveness. For a quotation provide formulation, daily volumes, analysis, temperatures and destination. Neptuno can assess separation and a trial scope without transferring another manufacturer’s published recovery percentages to your plant.
Common questions
Does conductivity show how much active caustic remains?
Not necessarily: other salts contribute. Relate the signal to an appropriate alkalinity method and actual solution composition.
Does clear permeate mean reusable CIP?
No. It must meet chemical-quality and cleaning-performance requirements, including any applicable hygienic controls.