Safe Chemical Solutions Since 1942


Struvite Removal

RYDLYME Biodegradable Struvite Remover is safe for personnel, non-hazardous and non-corrosive!


Where acids and mechanical cleaning methods fail... RYDLYME succeeds!

  • Safely and efficiently dissolve tough struvite buildup in piping at wastewater treatment plants (WWTP) or anywhere where struvite is an issue!

  • Biodegradable WITHOUT neutralization!

  • Non-hazardous! Safe to handle!

  • Safe on metals and materials found at WWTPs and other wastewater facilities!

Struvite Removal

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Struvite_RemovalWhat is Struvite?

Struvite is a naturally occurring crystal of magnesium, ammonium and phosphate. Struvite crystallizes in the orthorhombic system as white to yellowish or brownish-white pyramidal crystals or in platey mica-like forms.

It can be a problem in sewage and waste water treatment, particularly after anaerobic digesters release ammonium and phosphate from waste material, as it forms a scale on lines and clogs system pipes.

In some cases, struvite buildup  has been known to have to consistency of concrete. Struvite was first described from medieval sewer systems in Hamburg Germany in 1845 and named for geographer and geologist Heinrich Christian Gottfried von Struve (1772-1851).

The first-known use of struvite as an agricultural fertilizer was first reported in 1857.

How to use RYDLYME when removing struvite from pipes

Adding RYDLYME to the waste water treatment pipes allows the struvite to be dissolved and removed from the system. This can all be accommodated during the normal operation without shutdown! It is imperative when calculating a required amount of RYDLYME needed for waste water treatment pipes to include enough RYDLYME for the equipment.

How to remove struvite from pipes in waste water

  1. Obtain struvite deposit for testing with RYDLYME to confirm adequate concentration to dissolve & remove struvite (typically 50-100%). Note severity of struvite build up. Obtain the current water volume of the struvite infected system as well as the designed water volume.
  2. To setup a circulation, connect circulating pump inlet to vented container via hose.
  3. Run another hose from pump outlet to lowest accessible point of struvite infected system.
  4. Run another hose from the highest accessible point of struvite infected system back to the vented circulating container.
  5. Add prescribed amount of RYDLYME to circulating container and turn on pump to begin dissolving & removing struvite. Add water to the solution until a complete circuit is obtained.
  6. Continue circulation for 6-12 hours depending on struvite severity and volume of system. Hourly monitor the RYDLYME solution to determine end point. If RYDLYME is neutralized prior to the prescribed circulating duration, then more RYDLYME should be added in order to remove remaining struvite.
  7. Upon completion of the struvite cleaning, rinse the system with clean water to remove any insoluble materials that may have been released from the struvite deposit.

Struvite control in waste water

View the job reports below for further information on struvite control in waste water and removing struvite from pipes!


Tackling struvite in 1,600 feet of pipe at a WWTP

A wastewater treatment plant (WWTP) had a severe buildup of struvite throughout 1,600 feet of piping effectively reducing the 6-inch diameter to 1 inch. Known to have the consistency of concrete, the struvite was no match for RYDLYME

RYDLYME approach

  • 330 gallons
  • Could not circulate due to design of system; pumped throughout pipe and let stand for 8 hours
  • 100% concentration due to time concerns (future cleanings will require lesser cleaning times and amount of solution)

RYDLYME results

  • After 8-hour session and water flush, struvite was dissolved and flow rate returned to normal!



RYDLYME called upon again to dissolve struvite

After dissolving 1,600 feet of struvite-corroded pipe at a WWTP, RYDLYME was called in again to dissolve more struvite. This time the buildup was within 500 feet of pipe (6- and 8-inch in diameter) on the inlet side of the solids centrifuge. The severe buildup reduced the capacity of the pipe to only 20 cubic meters per hour (88gpm). 

RYDLYME approach

  • 825 gallons
  • Circulated via 1 1/2-inch centrifugal pump for 8 hours

RYDLYME results

  • The capacity of the pipe increased to an astounding 220 cubic meters per hour (968gpm)!



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Apex Engineering Products Corporation  |  1241 Shoreline Drive  |  Aurora, IL 60504  |  Tel: 800.451-6291 or 1.630.820.8888  |  Fax: 630.820.8886  |  Made in the U.S.A.

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