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Struvite Removal with RYDLYME

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Struvite_RemovalWhat is Struvite?

Struvite is a naturally occurring crystal of magnesium, ammonium and phosphate. Struvite is a primary concern at wastewater treatment plants, particularly after anaerobic digesters release ammonium and phosphate from waste material that crystalize into concrete like deposits that can form on the downstream system components. Struvite formation occurs because you have magnesium from hard water, ammonia as a byproduct of urea and urine and phosphate from the organic matter being processed, coming together in the plant’s system to form crystals that can deposit on pipe walls as well as on other components of the treatment system.

How to use RYDLYME when removing struvite from pipes

RYDLYME is extremely effective in dissolving struvite deposits from the piping and other affected equipment in wastewater treatment plants. The amount of RYDLYME required will be dependent on the severity of the struvite accumulation and the volume of the system to be cleaned. Typically, RYDLYME will be applied at 50-100% depending on the thickness of the struvite deposits to be removed. The preferred method of application is to circulate the RYDLYME solution through the pipe or equipment, but it can also be effective when utilized in a static or fill and soak application.

How to remove struvite from pipes in waste water

Apex highly recommends that, prior to cleaning, you contact us for technical assistance in determining the best dilution and method for removing your struvite scale deposits.

  1. Obtain struvite deposit for testing with RYDLYME to confirm adequate concentration to dissolve 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 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. (See “Testing the Effectiveness of RYDLYME”)
  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.
  8. Return the system to service.

Struvite removal in waste water

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


Struvite Removal from a Pipe at a WWTP

An East Coast wastewater treatment plant experiencing filtration system flow issues turned to RYDLYME Biodegradable Descaler as a solution to remove the struvite deposits which had accumulated. Over the years struvite had restricted the flow of the system’s 4” pipe connecting the transfer pump to the holding tank down to 12 gallons per minute. When the system was originally installed in 2010, the recorded flow rate was 240 gpm! Due to the severe buildup, the plant was forced to add RYDLYME incrementally over the course of a few days, but all of the struvite deposit was successfully dissolved. The pump was turned back on and achieved a flow rate of 240gpm!

“Overall, we can say things went better than expected! RYDLYME will be a ‘go-to’ for us when combatting struvite in the future.” – Plant Assistant Superintendent


Struvite had restricted flow of the system’s 4’’ pipe connecting the transfer pump to the holding tank down to 12 gallons per minute.


Four (4) 55 gallon drums of RYDLYME were added incrementally over the course of a few days due to the severe struvite buildup.


After the RYDLYME cleaning, the plant was back at 240 gallons per minute! This flow rate had not been achieved in over 8 years! The Plant Assistant Superintendent has said that RYDLYME will likely be a ‘go-to’ when combatting struvite in the future.


RYDLYME called upon again to dissolve heavy struvite deposits

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 flow rate of the pipe to only 88 gpm or 20 cubic meters per hour.


Cleaning the struvite from 500 feet of solids centrifuge supply pipe that was nearly completely obstructed with deposits.


Circulating 825 gallons of RYDLYME via a 1 1/2 inch centrifugal pump for 8 hours.


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





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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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