Safe Chemical Solutions Since 1942


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!

  • 100% biodegradable WITHOUT neutralization!

  • Non-hazardous! Safe to handle!

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



What 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.


Contact us to learn more about how RYDLYME can help solve your struvite problem! Call us at 800.451.6291 or 630.820.8888!

Struvite & Wastewater Contaminants Beware


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!




The city of Oconto, Wisconsin was looking to reduce corrosion from high levels of H2S at one of its sewer line lift stations, as well as odors that resulted in several complaints from residents. The system was also experiencing high and fluctuating levels of BOD, FOG, COD and TDS. Three sanitary districts feed into this sewer line through several miles of enclosed plastic sewer pipe with approximately 33,000 gallons of residential sewage flowing through this particular monitoring station.
In addition to monitoring daily H2S levels using an Oda-Log monitoring system, the city was using Bioxide to control odors and corrosion. Anywhere from 2 gallons to as much as 15 gallons of Bioxide were added to the system per day, but was not effectively solving the issues.


RYDALL WO Solution

After understanding the science and benefits behind RYDALL WO, the city agreed to use the non-active biocatalyst per our recommendation to reduce the odors, corrosion and contaminants. We recommended injecting RYDALL WO at 100 ppm (3.3 gallons per day) with a metering pump at a lift station approximately 7 miles upstream from the problematic area. This allowed approximately 2.5 days of retention time for the RYDALL WO  to work. 
Along with the city’s continuous monitoring of H2S levels, samples of the wastewater were also taken weekly from each location and tested by our team for BOD, FOG, COD and TDS levels (samples of the wastewater prior to treatment were also taken for control purposes).
Over the course of the next 90 days, our tests showed average levels of BOD, FOG, COD and TDS decreased significantly, as shown below:
  • BOD levels decreased by 28%!
  • FOG levels decreased by 67%!
  • COD levels decreased by 30%!
  • TDS  levels decreased by 23%!
Compared to the city’s data from a similar time frame in 2012 when Bioxide was used, the amount of H2S released during RYDALL WO  treatment decreased by more than 50%! Within the first couple weeks, odors from the problematic lift station were drastically reduced and there were no odor complaints from the surrounding community. Also, the city saw a significant reduction in corrosion at the site. Components that were normally replaced due to corrosion from H2S, did not have to be replaced during the trial!

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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