Most recent article for: GritGone Process®

Case Study: 630-Tons of Sand & Grit Removed from Oxidation Ditches

August 31, 2021
Florida Sand and Grit Grant Program Covers Restoration Costs PROBLEM: Two oxidation ditches at two wastewater treatment plants serving the City of Mount Dora were due for cleaning, having accumulated a significant amount of sand, grit, and debris over 15-years. This loss of capacity was increasing energy costs and reducing efficiency at these treatment plants. U.S. Submergent Technologies’ (USST) knowledgeable crew was called-in with our versatile Combination3® Truck, able to handle multiple setups to complete these projects. SOLUTION: A large oxidation ditch measuring approximately 50-feet wide by 330-feet in length was the first structure our crew tackled. While this oxidation ditch was in full operation, USST utilized the Combination3® Truck’s downhole pump and 49-foot extendable boom combined with our GritGone Process® to remove approximately 287-tons of sand and grit material. The tank did not have to be drained down or taken offline for our crew to perform the cleaning. The second oxidation ditch measured approximately 40-feet wide by 130-feet in length, and a drain down was necessary to effectively reach the material. Our experienced crew safely executed confined space entry protocols and procedures to clean this structure. RESULTS: In total, approximately 630-tons of material was removed from these two structures and disposed of off-site, restoring capacity, efficiency, and flow to the City’s treatment plant. By restoring capacity USST estimates the City saved over $1.5 million in capital expense to rebuild the treatment capacity. In other words, the cost of maintaining existing treatment volume is much less than re-building the oxidation ditches treatment volume. USST worked with the City of Mount Dora to take advantage of Florida’s Sand and Grit Grant Program, which makes it possible for publicly owned facilities averaging 3MGD or less to address the issues of sand and grit accumulation by reimbursing 50-100% of restoration costs. To learn more about this program call (941) 404-3405 or email View the entire case study here.
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February 21, 2018

20-Foot High Tank Cleaned While in Operation

180-CY Removed in Davie, Florida   Capacity was recently restored to the Town of Davie’s WWTP as part of their Capital Improvement Program, a facility which handles an average daily flow of around 3MGD.  More than 180-CY of sand and material was removed from Davie’s 20-foot high surge tank while it remained in full operation.  Using USST’s extended boom and Combination3® technology, the material removed was immediately ready for disposal. John McGeary has resided as Chief Operator of the Town of Davie’s WWTP for almost five years, and has 38 years’ experience in the wastewater industry.  He says “[I was]

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January 24, 2018

2,500-Feet of Large Diameter Pipe Cleaned

Access Issues Not An Issue   USST is currently working for the City of Orlando removing sand, grit and material from 2,500 feet of 48-inch sanitary sewer pipe near Kirkman Road, leading to the City’s Conserv II Water Reclamation Facility. The City of Orlando’s project manager, Charlie Conklin, P.E., says “I am very happy with their performance on this project, and I’m looking forward to utilizing their services on the next phase of this project and other future projects.” Access issues on the project included hard-to-reach manholes located on the opposite side of Shingle Creek. Access for equipment was also

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November 20, 2017

Lift Station Maintenance Made Easy

REDUCE THE RISK OF SANITARY SEWER OVERFLOW IN WET WELLS Wet well and lift station maintenance are a frequent source of concern for most wastewater collection systems. Performing regular maintenance can be difficult due to access challenges, costs associated with shutting down pumps, and confined space entry permitting and safety issues.   Wastewater systems rely on lift or pump stations to transport collected wastewater to a treatment plant.  Lift or pump stations typically include two to three pumps for redundancy — all of which require periodic inspection and maintenance.  More often than not, a wastewater facility may only have one operable

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October 16, 2017

Facility Remains in Full Operation While Cleaned

Capacity Restored in Charlotte County The Burnt Store Water Reclamation Facility (WRF) treats wastewater from more than 1,200 sewer connections in a southeastern portion of Charlotte County.  Acquired by Charlotte County in 2003, the former 0.25 millions of gallons per day (MGD) facility underwent several upgrades, including doubling its treatment capacity to 0.5 MGD, as well as enabling the facility to simultaneously dispose of reject water and excess effluent produced by the plant.   USST removed 21-cubic yards of sand and grit from three structures at Charlotte County’s Burnt Store WRF.  Thanks to our GritGone Process®, the facility remained in

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August 28, 2017

Debris Removed, Diffusers Unharmed

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June 22, 2015

Energy Savings Through the GritGone Process

Cleaning your tanks is not only important to restore capacity, but it also has potential to save on energy, which cuts costs down the road. Sand and grit is a heavy solid with a specific gravity greater than 1, so it accumulates and settles to the bottom of the tanks. The system then has to work harder to keep the sand suspended and allow oxygen to flow through the system to treat the water. Over time, this can drastically increase costs and detention times. U.S. Submergent Technologies recently conducted an energy analysis for a facility that used the GritGone Process®

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June 8, 2015

U.S. Submergent Technologies Enters Manufacturing Agreement with Wayne Industrial Holdings

New relationship will increase production of proprietary Combination³ trucks June 8, 2015 – Sarasota, FL – U.S. Submergent Technologies announces the entering of a manufacturing agreement with Iowa-based Wayne Industrial Holdings, LLC. The agreement increases production of US Submergent’s proprietary equipment and allows the company to continue their expansion. USST’s unique combination trucks are designed to remove debris from collection and treatment system structures without taking them offline. The equipment overcomes the limitations of vacuum technology and has the potential to save customers time and money.   “This agreement provides an opportunity to increase our ability to build and deliver our Combination³® capabilities

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February 17, 2015

What’s in the Tank?

U.S. Submergent Technologies boasts its ability to remove sand and grit while the plant remains in full operation, and our equipment has a proven success track to back this claim. But what if we aren’t talking about sand and grit? Let’s take a look at what other materials can be settled at the bottom of the tank and how the GritGone Process® can handle them. The types of material found at the bottom of the tank varies depending on which stage it is in the wastewater treatment process. For example, in the anaerobic zone, the accumulated material may not be

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