News from Schwing Bioset

Schwing Bioset Onsite Demonstrations Help Find Solutions


Written by Dan Anderson

The past year has been full of onsite demonstrations and we are looking forward to another busy year for our demo fleet.

In 2016, we completed several successful onsite demos for solids pumping, the Bioset process for Class A Biosolids, nutrient removal/struvite recovery, and screw press dewatering.

Our demo program is a great way to see first-hand how our equipment can help your plant. Demos can run anywhere from a few days to a few months, depending on the needs of the plant.

Whether it is pumping material with ease, producing a beneficial re-use product, dewatering sludge efficiently, or removing unwanted nutrients to help your plant and the environment, Schwing Bioset has a vast array of knowledge, tools, and equipment to help your plant find the right solution.

For more information on our demos, please contact Chuck Wanstrom at or 715.247.3433.

Schwing Bioset Class A Biosolids Demo Unit  Schwing Bioset Screw Press Demo Unit



Tags: Bioset Process, Biosolids Handling, Screw Press, Bioset Demo, Screw Press Demo

Sliding Frame Silos Help Treatment Plant Produce More of a Good Thing


Written by Eric Wanstrom, December 1, 2016

Ocean County Utilities Agency (OCUA) had been producing OCEANGRO fertilizer with Biosolids from their Central Treatment Plant with great success.  Currently, every bag of OCEANGRO produced is sold in the community.  Ocean County looked to increase the production of OCEANGRO to meet the increasing demand by using Biosolids from their North treatment plant.  This posed several challenges though: How would they get the Biosolids into the trucks at the North Plant?  How would they get it out of the trucks at the Central plant?  Once there, how would they blend the stream of the two differing Biosolids to make the uniform blend of material required by their Biosolids dryer? 

Ocean County Pump.jpgSchwing Bioset was able to work with Ocean County to provide a solution to the challenges of loading, receiving, and blending the Biosolids.  Schwing Bioset manufactured a custom designed storage silo with a sliding frame feeder at the North plant, designed to load trucks with Biosolids.  This silo would store the Biosolids and rapidly feed it into the trucks, but first the biosolids would have to get there from the new Belt filter presses, a distance of roughly 300 feet.  So, Schwing Bioset supplied high pressure piston pumps rated for 100 bar line pressure to pump the biosolids from the dewatering collection area to the top of the truck loading silo.

Ocean County Storage Silo.jpg

At the Central plant, there are two sliding frame silos to receive the biosolids coming from the North plant.  The sliding frames easily feed the material to the close-coupled pumps and can even push small rocks and tramp material that might make their way into the trucks or bins.  The silos are equipped with covers to contain odors from the biosolids and are large enough to each receive a full 25-ton truck load of cake.  The two storage silos provide ample capacity, allowing Operators at the Central plant to meter the North biosolids feed with the feed from the Central plant and provide a uniform blend for pressing the OCEANGRO fertilizer.

The silos give Ocean County Utilities exactly what they needed, the ability and the flexibility to process the additional biosolids from the North plant at the rate needed to keep production running smoothly at the Central plant, while accomplishing the goal of increasing the amount of biosolids beneficially re-used as OCEANGRO fertilizer.

To learn more about Sliding Frame capabilities, watch the Sliding Frame video on our website, contact a Schwing Bioset Regional Sales Manager, call 715.247.3433, or email

For further information on the project, visit this website:  




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Tags: Biosolids Handling, Sliding Frame Silos, Biosolids Storage, Truck Loading

City of Edmonton's WWTP Truck Loading Tribulations


Written by Joshua DiValentino, June 27, 2016

The City of Edmonton’s Gold Bar WWTP saw cake storage and transfer to truck loading as a bottleneck in their plant. Current operations included storage of mechanically dewatered sludge in a Schwing Bioset push floor bunker installed in 1999. From there it was pumped to a composting operation where the product is distributed for beneficial use.  Area growth led to biosolids volumes exceeding composter capacity and a screw conveyor bypass was installed from the storage bunker to divert excess biosolids to truck loading for land application.  As biosolids production grew, it became increasingly clear this conveyor bypass was not a long-term solution, as it would take 45 minutes to load a truck.

Edmonton installed a new piston pump in the existing storage bunker to transfer biosolids to two new, 250 cubic yard capacity sliding frame truck loading silos. The silos are capable of storing enough volume of biosolids to seamlessly support plant process flow.  Each has three drop points to load two different styles of trailers, and hanging pendant controls, so the driver does not need to leave his cab during loading operations.

The plant can now easily handle the increased biosolids production and is able to load trailers in less than 15 minutes without requiring repositioning. The system improved process efficiency while minimizing O&M costs, providing more operational uptime for this 24-hour facility.

The Schwing Bioset, Inc. Field Services Team supports start-up and long term parts/maintenance of these systems. To see video of the Sliding Frame System in action or learn more about it, contact a Schwing Bioset Regional Sales Manager, call 715.247.3433, email, and/or visit our Sliding Frame Silos webpage.

Schwing Bioset Sliding Frame Silos    Schwing Bioset Sliding Frame Silos


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Tags: Biosolids Handling, Sliding Frame Silos, Biosolids Storage

Schwing Bioset and Biosolids Distribution Services Open First Owned and Operated Regional Class AA/EQ Bioset Facility

Posted on August 28, 2013
The recently opened BDS and Schwing Bioset Regional Class AA/EQ Bioset facility receives outside sludge for treatment to Class AA/EQ on a pay-per-ton basis.


Ft. Meade, FL – Florida’s revised wastewater residuals regulations (F.A.C. 62-640) affect and limit the disposal options for municipalities producing biosolids. In response to the changing regulations, Schwing Bioset and BDS decided that the time was right to open a regional bioset facility that would accept outside biosolids and turn them into a Class AA/EQ material that has a wider array of beneficial reuse applications.

"Up till now, municipalities really only had one option when it came to biosolids. We saw this as great opportunity to innovate; an opportunity to break the mold and offer our clients with an alternative. In the most basic terms, our regional Class AA/EQ bioset facility allows wastewater treatment facilities to pay for biosolids processing without any capital outlay," stated Dan Anderson, General Manager of Biosolids Distribution Services.

The BDS regional Class AA/EQ bioset facility, located in Ft. Meade, Florida, accepts three primary types of material: cake sludge, septage and liquid sludge, and treats these materials using the patented Bioset process (liquid sludge and septage are dewatered before treated) which produces material that meets the highest quality standards set by the EPA, Class AA/EQ. Class AA/EQ material is exceptional quality and can be used as a fertilizer supplement or soil amendment.

"With significant advantages over other fertilizer products, the Class AA/EQ material created by the patented Bioset process is safe to be used as a fertilizer the next day," stated Anderson.

Florida’s revised regulations create challenges for any wastewater treatment facility whose biosolids do not meet Class A standards. Schwing Bioset and BDS are proud to offer these facilities with an alternative that is convenient and affordable and produces a sustainable end product for better reuse.

>>Read the article on PRWeb

Tags: Biosolids Processing, Bioset Process, Beneficial Reuse, Class 'AA' Biosolids, Class AA/EQ Biosolids, Biosolids, Fertilizer, Biosolids Handling

The Anatomy of Pumping Biosolids Into Incinerators (part 2)

Considering the volume of biosolid waste that the average incineration system can process for its size, installing one in a biosolids handling facility is often the most economical choice. Additionally, having the ability to dispose of material on site will reduce or eliminate external handling and processing costs.  Operational efficiency, on the other hand, is controlled in large part by the support equipment that supplies material for incineration. To operate at optimal efficiency the incinerator needs to receive material at a steady flow that is high in solids content. Under proper conditions many modern incinerators can achieve what is known as a “free burn” which is when dry material (usually more than 22% solids) can be steadily burned without the addition of fuel oil. In order to achieve this level of efficiency, high quality dewatering and sludge delivery equipment are needed.   


Schwing Bioset piston pumps have become a market leader in pumping high solids material to incinerations across North America. In many cases the pumps receive material that is in access of 25% solids and pump it to the incinerator where line pressures can easily exceed 1,000 psi. This is accomplished by linear rams and driven by a hydraulic system operating at pressures up to 4,000 psi. The power is supplied using soft switch & ideal switch technology that not only limits hard shifts at those pressures but still allows an even material flow, so burning at the incinerator is not interrupted. Schwing pumps are also supplied with a patented Sludge Flow Measuring System (SFMS) that accurately measures material volume going into the incinerator. It is essential to track these metrics as well as emissions in order to comply with all federal regulations.        

Tags: Biosolids Processing, Wastewater Treatment, Biosolids Handling

The Anatomy of Pumping Biosolids Into Incenerators (part 1)


            In the first post discussing Class A biosolids, we outlined the standards required by sludge to be used in the lime stabilization process. The sludge must not exceed the allowable concentration of pollutants set by the EPA (to view this list and allowable concentrations see March 19, 2010 post). If elevated levels of any pollutants are found the sludge is no longer eligible for land application and must be either land filled or incinerated. Incineration is the preferred disposal method in areas with high population density and limited access to landfills.    

            The two primary types of incineration are Multiple Hearth Furnaces (MHF) and Fluidized Bed Incinerators (FBI). MHF consist of a series of zones that material is passed thru that first dries and then incinerates biosolid sludge. FBI use a single chamber area that flash dries and then incinerates the sludge in a single step. Both operate at temperatures between 1400 to 1800 degrees Fahrenheit and utilize forced air systems for combustion and waste gas removal. The two primary byproducts of the processes are heat and ash, some of these byproducts can be beneficially reused. Waste heat can be used to heat incoming air for improved combustion efficiency and fly ash is sold to batch plants and used as an additive for concrete. Waste gasses are passed through scrubbers in order to prevent pollutants from being released into the atmosphere. MHF have become obsolete due to there space requirements and poor efficiency in comparison to FBI. 

Tags: Wastewater Treatment, Biosolids Handling, Biosolids Drying

Lime Stabilization-Fact vs. Fiction(myth-busted)

As you can imagine, working with sludges and biosolids brings up a number of concerns, from the basic to the technical. At the very basic, there’s “does it have an awful smell?” It’s a natural enough concern—we’re working with human waste, after all. But is there a terrible smell?

Class A Biosolids
Not at all, thanks to the Schwing Bioset process. A pinch valve flattens the sludge flowing out of the reactor, creating additional surface area to allow the ammonia and other compounds to be released and subsequently captured and scrubbed under the collection hood. The smell, overall, is akin to wet concrete (because of the lime content). In fact, in many instances the Class AA product produced by the Schwing Bioset process is stored outdoors on the edge of town with residential homes within sight.
At the more technical end, other lime stabilization systems are plagued by poorly mixed lime and sludge. Schwing Bioset solves this with a twin auger mixer that ensures the lime and sludge are thoroughly combined.
Another common concern is that the lime/sludge dust will make for a tough work environment. But the Schwing Bioset process is a closed system with a sealed mixing hopper—and that ensures the dust stays inside the machine, and not your lungs.


Tags: Biosolids Process, Bioset Process, Bioset Class A, Fertilizer Replacement, Biosolids Handling

Class A Biosolids vs. Class B in Plain English

What’s Class A? What’s Class B?

The EPA provides A Plain English Guide to the EPA Part 503 Biosolids Rule, which is broken into ten chapters. Table 2-5 in Chapter 2 (PDF) summarizes the differences between the pathogen reduction requirements for Class A and Class B biosolids:

 class A biosolids, class B biosolids

Class A

Class B

In addition to meting the requirements in one of the six alternatives listed below, fecal coliform or Salmonella sp. Bacteria levels must meet specific density requirements at the time of biosolids use or disposal or when prepared for sale or give-away (see Chapter Five [PDF] of this guidance).

The requirements in one of the three alternatives below must be met.

Alternative 1: Thermally Treated Biosolids
Use one of four time-temperature regimens.

Alternative 1: Monitoring of Indicator Organisms
Test for fecal coliform density as an indicator for all pathogens at the time of biosolids use or disposal

Alternative 2: Biosolids Treated in a High pH-High Temperature Process
Specifies pH, temperature, and air-drying requirements

Alternative 2: Use of PSRP
Biosolids are treated in one of the Processes to Significantly Reduce Pathogens (PSRP) (see Table 5-7)

Alternative 3: For Biosolids Treated in Other Processes
Demonstrate that the process can reduce enteric viruses and viable helminth ova. Maintain operating conditions used in the demonstration.

Alternative 3: Use of Processes Equivalent to PSRP
Biosolids are treated in a process equivalent to one of the PSRPs, as determined by the permitting authority

Alternative 4: Biosolids Treated in Unknown Process
Demonstration of the process is unnecessary. Instead, test for pathogens—Salmonella sp. or fecal coliform bacteria, enteric viruses, and viable helminth ova—at the time the biosolids are used or disposed of or are prepared for sale or give-away.


Alternative 5: Use of PFRP
Biosolids are treated in one of the Processes to Further Reduce Pathogens (PFRP) (see Table 5-4)

Alternative 6: Use of a Process Equivalent to PFRP
Biosolids are treated in a process equivalent to one of the PFRPs, as determined by the permitting authority


Do you have more questions? CLICK HERE

Tags: Class 'A' Biosolids, Biosolids Process, EPA, Biosolids Handling