News from Schwing Bioset

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

SBI Installs New Beneficial Reuse Bioset System in Northern Minn.


Schwing Bioset Announces New Beneficial Reuse Bioset System Installation in Northern Minnesota

The Bioset System will enable the Coleraine/Bovey/Taconite Joint Wastewater Commission to produce a soil amendment that meets the USEPA Class 'A' standards year round

Itasca County, MN- In Q3 of 2009 Schwing Bioset was awarded the contract to provide a Bioset System to the Coleraine/Bovey/Taconite Joint Wastewater Commission. This system was the lowest cost when compared to other technologies, and it produces a USEPA Class ‘A’ end product, unlike the other technologies that produced a USEPA Class ‘B’ material. The installation was completed in Q2 of 2011 and is fully operational.

The existing digesters could not meet the USEPA Class B standards in the winter months so the Commission needed to find a solution. After a reasonable amount of due diligence, the Commission secured the services of a local consulting engineering firm to explore alternatives for meeting the USEPA standards year round.

The engineer was faced with several challenges as they began their investigation. The plant was small, processing 0.5 MGD, and most available technologies would not scale down well or work well with intermittent biosolids processing. Another challenge was related to protracted winters and the need to find a place to store Class ‘B’ materials until the ground thawed and the biosolids could be land applied on the Commissions’ hay fields.

After considering options of a new digester, retrofitting the existing digester with heat exchangers, and reed beds, ultimately the Bioset process, Schwing Bioset’s alkaline stabilization process, was selected as the best available technology to meet these challenges.

About Schwing Bioset

For more than 25 years, Schwing Bioset has been helping wastewater treatment plants, mines and power generation customers by engineering material handling solutions. Schwing Bioset’s custom engineered solutions can be found in hundreds of wastewater treatment plants in North America as well as mines and tunnels around the world.



Tags: Biosolids Processing, Bioset Process, Alkaline Stabilization, Class 'A' Materials, Biosolids, Wastewater Treatment

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

Positive Results From Schwing Bioset Stabilization System

Case Study: Hollywood, FL

The South Regional wastewater treatment plant (WWTP) is owned by the city of Hollywood, Florida, primarily serving Hollywood and surrounding communities. The South Regional WWTP is an activated sludge facility that produces 60 tons of dry solids per day. The sludge is dewatered with six 2 meter Andritz belt filter presses to approximately 16 % total solids.

Sludge was being disposed at regional landfills until Florida changed its environmental regulations to protect the Okeechobee/Everglades watershed and to encourage reuse of biosolids. This substantially increased fees for disposing of biosolids.

The South Regional WWTP installed an alkaline stabilization facility in the 1990s, but it was decommissioned when neighbors complained about the odor and noise.

The retrofit of the Schwing Bioset stabilization system required demolition of all of the legacy equipment save the truck loading equipment and the lime handling equipment, which consisted of two 3500 cubic foot bulk storage silos and a pneumatic conveyance system.

Installation proceeded close to schedule; the only surprises were hurricanes Francis, Ivan, and Jeanne, as well as a pneumatic lime system that proved to need an overhaul of the rotary and diversion valves, replacement of the silo dust collectors, and replacement of silo isolation knife gate valves.

The facility has been in operation since February 2005 and over 200,000 wet tons of biosolids have been processed to a very positive response: fugitive dust and sludge spills, as occurred with the earlier equipment, are gone, and the new Bioset equipment controls odors. It’s gone so well that the disposal contract has been renewed for the next 5 years.

South Regional wastewater treatment plant

Tags: Biosolids Processing, Water Environment Federation (WEF), Biosolids, Wastewater Treatment

Biosolids in the Future

Mankato, MN: The Future of Biosolids

Mankato, MN, a small city in southern Minnesota, was recently recognized by the National Biosolids Partnership with environmental management system (EMS) Certification. Mankato’s wastewater treatment facility is the first organization in Minnesota and the 28th in the nation to achieve this certification.

Some of the benefits Mankato has seen from the EMS process include:

  • Energy savings and reduced greenhouse gas emissions resulting in the use of 95% of methane generated.
  • Solids content in biosolids being sent for land application has increased from 18% to 20%, resulting in better quality product and lower transportation and energy costs.
                           EMS certified by the national biosolids partnership

The National Biosolids Partnership is a not-for-profit alliance formed in 1997 with the National Association of Clean Water Agencies, Water Environment Federation, and U.S. Environmental Protection Agency. Its goal is to advance environmentally sound and accepted biosolids management practices. Biosolids producers, service contractors, and users—together with regulatory agencies, universities, farmers, and environmental organizations—have input into shaping NBP priorities through scientific and technical support relating to biosolids issues.

The type of system in place in Mankato is a bright indicator of the future of biosolids. In fact, Mankato City Manager Pat Hentges noted, “Who knows, in the future it might be a closed system,” where wastewater could be cleaned and reused as drinking water.

For more information about clean, environmentally efficient biosolids processing, contact Schwing-Bioset

Tags: Biosolids Processing, Water Environment Federation (WEF), Biosolids, Wastewater Treatment