Struvite and Viviante Remover and Inhibitors

We have developed a special formulation that can easily dissolve struvite and vivianite as well as prevents its’ formation. In hard to reach areas like the overflow from a digester, filtrate lines from a belt press, rollers and belts on a belt press, centrate lines, valves, elbows and heat exchangers, our product will dissolved struvite and vivianite in place without creating an acid waste or toxic by-products. Our struvite remover, JS 9325 is very effective on old and hard struvite deposits.

Struvite is a magnesium ammonium phosphate (MgNH4PO4-6H20) compound which is also called MAP. In most system where MAP is a problem, you need to have a specific ratio of magnesium to ammonia to phosphate to precipitate struvite. In wastewater treatment plant, the major controlling factors are the magnesium level, CO2 release and pH. So to control the precipitation of struvite you need to control magnesium. For years, to control scale (calcium and magnesium), we have been using crystal modifiers. Recently, we have found specific crystal modifiers have the ability to resolubilize magnesium from the MAP crystal. Once you have removed the magnesium from the MAP crystal, the phosphate and ammonia goes back into solution and is easily removed. The rate of solubilizing magnesium from the MAP crystal is a function of concentration and time.

Running a study, with a product developed by Jenfitch, LLC (sales@jenfitch.com) called JS 9325, we were able to quickly clean a pump and valve assembly with an environmental safe product. We found that it took 2 lbs of JS 9325 to dissolve 1 lb of struvite. In our first test, we recirculated a 30% ( by weight) solution through a closed loop system that had a 2” build up in the pipeline and 1” build up on the pump inlet and outlet. After recirculating for 6 hours, we inspected the lines and the pump. The lines were clean with trace amounts of grayish film (struvite deposit less than 1/64”). We tested the spent solution. The pH was 3.5. We found soluble magnesium (chelated magnesium), ammonium phosphate, and carboxylic acid.

In another application, the plant manager had notice a struvite build up in the overflow line from the digester and in the elbows going to the sludge holding ponds. He said they were pumping 24 hours per day and could not maintain levels in the digester. He had a maintenance person check the sludge pumps and they discovered the pumps were operating at a high back pressure. The plant manager purchased 2 drums of JS 9325 and make up a 30% (by weight) solution. He fed it into the digester overflow box –filled the pipeline and let it sit overnight. The next morning they started up the transfer pumps and reported that they were able to get the levels in the digester down after 18 hours instead of 24 hours. We checked back with the plant manager several months later and the pumps were controlling the sludge level in the digester with only 18 hours of operation.

In all of our studies, we have found that once struvite forms on a surface, the deposit grows quickly. If you remove the struvite deposit and the re-occurrence is much slower. By planning a monthly or quarterly flush, we have seen plants minimize struvite deposits. In a wastewater treatment plant in Northern California with a plant flow rate of 10 mgd, they were experiencing struvite deposits on their screw press and vivianite in the heat exchanger. They purchased 2 drums of JS 9325. With a small metering pump, they applied JS 9325 to the spray bar for external washing of the screens on the screw press. After a week, the struvite deposit on the surface of the screen of the screw press had no visible struvite deposits. They had cleaned online the screen of the screw press. The same plant also had a problem with vivianite in their heat exchangers. They took one heat exchanger off line and made up a 50% solution. They raised the temperature to 95F and let it sit overnight. The vivianite deposit was gone!! They inspected the heat exchanger and found a purple paste that washed out with little effort.

If you are experiencing a struvite or vivianite buildup, visit our website, www.jenfitch.com

For more technical information and case studies, contact us 925-289-3559 ext 102 or 925-305-7880.

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