News from Schwing Bioset

Biosolid Land Application Requirements

biosolids1EPA Part 503rule lists four options for meeting pollutant, pathogen, and vector limits in biosolids that are applied to land:
  • Exceptional Quality (EQ)
  • Pollutant Concentration (PC)
  • Cumulative Pollutant Loading rate (CPLR)
  • Annual Pollutant Loading Rate (APLR)

Each option is equally protective of the public health and the environment, so EQ, PC, CPLR, and APLR biosolids used in accordance with the Part 503 rule are all equally safe. For a detailed discussion on these four options, the best bet is to refer to the EPA, but the table below gives a brief primer on each.


Pollutant Limits

Pathogen Requirements

Vector Attraction Reduction Requirements

Exceptional Quality (EQ) Biosolids

Bulk or bagged biosolids meet pollutant concentration limits

Any one of the Class A requirements listed here

Any one of options 1–8 listed here.

Pollutant Concentration (PC) Biosolids

Bulk biosolids meet pollutant concentration limits

Any one of the Class B requirements listed here

Any one of the ten options listed here.

Any one of the Class A requirements listed here

Option 9 or 10 listed here.

Cumulative Pollutant Loading rate (CPLR) Biosolids

Bulk biosolids applied subject to cumulative pollutant loading rate limits listed here

Any one of the Class A or Class B requirements listed here

Any one of the ten options listed here.

Annual Pollutant Loading Rate (APLR) Biosolids

Bagged biosolids applied subject to annual pollutant loading rate limits

Any one of the Class A requirements listed here

Any one of options 1–8 listed here.

* Each of these options requires that the biosolids meet ceiling concentrations for pollutants, monitoring requirements, and recordkeeping and reporting requirements. See the EPA’s Part 503 Rule, Chapter 2 [PDF] for more information.

Schwing Bioset’s advanced processing technology can help you understand and meet these requirements. To learn more, contact Schwing Bioset.

Tags: Biosolids, Wastewater Treatment

What's Your Vector?

Biosolids can attract “vectors,” which are basically any living carrier that transmits an infectious agent (think ticks, mosquitoes, fleas, some kinds of flies, etc.). Meeting EPA Part 503 standards for Class A or B biosolids of various types requires that the biosolid meets at least one (sometimes more) of the ten vector attraction reduction options listed below:

Option 1. Reduce the mass of volatile solids by a minimum of 38%.

Option 2. Demonstrate vector attraction reduction with additional anaerobic digestion in a bench-scale unit.

Option 3. Demonstrate vector attraction reduction with additional aerobic digestion in a bench-scale unit.

Option 4. Meet a specific oxygen uptake rate for aerobically treated biosolids.

Option 5. Use aerobic processes at greater than 104°F (average temperatures 113°F) for 14 days or longer (e.g., during biosolids composting).

Option 6. Add alkaline materials to raise the pH under specified conditions.

Option 7. Reduce moisture content of biosolids that do not contain unstabilized solids from other than primary treatment to at least 75% solids.

Option 8. Reduce moisture content of biosolids with unstabilized solids to at least 90%.

Option 9. Inject biosolids beneath the soil surface within a specified time, depending on the level of pathogen treatment.

Option 10. Incorporate biosolids applied to or placed on the land surface within specified time periods after application to or placement on the land surface.

The Bioset process can help you achieve these options for your wastewater treatment. Contact Schwing Bioset for more information. For a more detailed explanation of these vector attraction reduction options, refer to the EPA’s Part 503 Rule, Chapter 5 [PDF].


Tags: Sludge Pumps, Biosolids, Wastewater Treatment

Can your Waterbed Create Class A Material?

If you were to visit a plant using fluid bed technology, you might be expecting a warehouse full of waterbeds. You'd be wrong, of course. But what you would find is nothing short of engineering wizardry.

Schwing Bioset engineers, manufactures and installs advanced technology that can be used to process sewage and biosolids into valuable Class A material. Fluid bed technology, a hallmark of Bioset's process, works with biosolids in a way that is multifunctional, ultra-efficient and even environmentally friendly.

Fluid bed technology can be applied to biosolids in a number of ways: drying, cooling, conditioning, classifying, and solvent removal and recovery are just a few of the possible applications.

fluid bed dryer

Fluid beds have numerous advantages over comparable technologies. The fluid bed drying system uses high thermal energy efficiency, which allows maximum performance at minimum temperatures. Because the temperatures are so low, drying biosolids using a fluid bed is extremely safe-not only for operators, but also for the environment. Furthermore, fluid beds self-cleaning, and everything in a fluid bed system is contained, so dust is limited as well.

Fluid bed processing allows for reduced consumption of energy and utilities, but doesn't sacrifice an ounce of performance. With a fluid bed, drying, cooling and/or conditioning steps can be combined in one unit. If space is still a concern, a fluid bed is worth considering: this entire system requires minimal space for installation compared with other processing technologies, and it contains minimal internal parts-and very few moving parts-as well. Finally, the process can be completely automated and even operated unattended.

Ultimately, fluid bed technology carries numerous benefits while still resulting in improved quality and consistency for the end product. If you're interested in learning more about fluid bed technology, contact Schwing Bioset today.

Tags: Fluid Bed Drying, Class 'A' Materials, Biosolids, Wastewater Treatment

Generating "Revinu"

Lime stabilization is a proven, EPA-approved method for treating sewage sludge. In the capable hands of Schwing Bioset, the technique of lime addition has gone from effective to exceptional.

Bioset's process optimizes the chemical requirements and system efficiencies of lime stabilization. The end product, called Revinu, is safe and has many uses including fertilizer and as a soil stabilizer. Revinu is inexpensive and reliable, and produces a readily usable and valuable Class AA product.

affordable fertilizer-Revinu

Compared to other methods of producing Class AA material, the Bioset process is affordable from both initial capital expenditures and ongoing operation and maintenance costs. The equipment is fully automated and requires very little operator time. As a Class AA biosolid, the end product can be widely used and handled without many of the restrictions imposed on a Class B product.

Revinu's nutrient composition is a strong selling point. First, Revinu's low phosphorus content means it can be applied in phosphorus-sensitive areas. Second, Revinu provides a slow-release alternative to commercial nitrogen, which gives consumers three times the amount of nitrogen breakdown for prolonged plant nutrition. Third, Revinu provides sufficient potassium-a nutrient that is often prohibitively expensive-to support root growth and proper seed germination for a fraction of the market price of potassium.

Finally, Revinu is made up of 35% to 55% organic humus. The humus in the material acts as a topsoil, replenishing the natural bacteria that are essential for optimal plant growth and root strength. Until Revinu arrived on the market, landowners were often unable to replace eroded topsoil due to the astronomical cost associated with the process. Revinu makes topsoil replenishment accessible and affordable.

In short, the Bioset process is the most versatile and attractive method for biosolids treatment on the market today.

Tags: Bioset Process, Class AA/EQ Biosolids, Biosolids, Wastewater Treatment, Fertilizer, Lime Stabilization

Biosolids Yield Happy Farmers & Happy Crops

In order to maintain your health, your doctor might recommend that you take a multivitamin.Biosolids act like a multivitamin for agricultural crops-and the result would make any nutritionist smile.

happy crops

Biosolids, like the ones processed using Schwing Bioset's advanced technology, can be applied as fertilizer to fields used for raising crops. According to the EPA, agricultural use of biosolids that meet strict quality criteria and application rates has been shown to produce significant improvements in crop growth and yield.

Why do biosolids make a difference for crops?

  • Biosolids are chock full of essential nutrients. Nutrients found in biosolids, such as nitrogen, phosphorus and potassium and trace elements such as calcium, copper, iron, magnesium, manganese, sulfur and zinc, are all necessary elements for crop production and growth.
  • Rejuvenation. The use of biosolids replenishes the organic matter that exists naturally in soil, but gets depleted over time with repetitive planting and harvesting cycles.
  • Moisture management. The organic matter improves soil structure by increasing the soil's ability to absorb and store moisture.
  • Defense. The organic nitrogen and phosphorous found in biosolids are used very efficiently by crops because these plant nutrients are released slowly throughout the growing season. This enables the crop to absorb these nutrients as the crop grows. This efficiency lessens the likelihood of groundwater pollution of nitrogen and phosphorous.
  • Environmental Friendliness. The application of biosolids reduces the need for chemical fertilizers.
  • The Bottom Line. Biosolids benefit farmers by reducing production costs.

Happy farmers, happy crops, happy-and-healthy-consumers. To learn more about how the Schwing Bioset process makes these valuable biosolids possible, contact Schwing Bioset.

Tags: Biosolids, Schwing Bioset Process, Fertilizer

Managing Cost, Air Quality and Odor Control with Schwing

Case Study: Ellsworth, WI

The West Central Wisconsin Biosolids Facility (WCWBF) is a regional biosolids processing facility in Ellsworth, Wisconsin, serving Ellsworth and over 20 neighboring communities. The biosolids are dewatered by centrifuges to 20-24% total solids. The dewatered sludge enters an alkaline stabilization system that mixes the sludge with lime and fly ash to yield a Class A product. The treated biosolids are stockpiled in a 37,000-square-foot covered storage building, and beneficially reused semi-annually by local farmers.

In 2008, WCWBF decided to upgrade the lime stabilization process, with the main goals being to contain cost and maintain air quality and odor control. The existing mixer used open hoppers; between that and the fly ash, the system generated a lot of dust. Furthermore, the facility received periodic complaints from neighbors about the odor.

WCWBF chose a Schwing-Bioset system employing a closed hopper, screw conveyors, and pressurized piping system to contain dust and odors. To avoid costly contract hauling charges, WCWBF had to achieve demolition of the old system and installation of the new Schwing-Bioset system within 10 days of shutting down the old system. Demolition and preparation took three days; Schwing Bioset's team installed the new equipment, including the electrical, within the remaining seven days.

With a few minor modifications to adapt it to the winter weather, the Schwing-Bioset system has performed within expectations since commissioning, achieving its goals of managing cost, dust, and odors.

Tags: Class 'A' Biosolids, Bioset Process, Alkaline Stabilization, Biosolids, Dewatering

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



Class A biosolids are completely safe for a variety of land applications. The end product is basically aerated soil that has beneficial levels of nitrogen, phosphorus, and potassium. The Class A product from a Bioset System has slightly elevated levels of lime as a result of the alkaline stabilization process. The alkaline reaction is as follows:
    CaO + H2O => Ca(OH)2  + 490 Btu/lb of heat

The by products of the reaction between quick lime and water are lime and the heat used to kill pathogens. Acid is also used to create a secondary reaction with the lime (Ca(OH)2) that can make up to an additional 400 Btu/lb of heat to accelerate pathogen kill. The end product has a PH of greater than 11.5. Long term tests have shown that this process maintains its PH several months after processing. This is important because some process can only reduce pathogens to safe levels for a short period of time when the material is dry. If pathogens are not thoroughly killed by treating extensively, then rain water and moisture can reactivate the pathogens in the soil and make them unsafe.   

The end product is used as a fertilizer because it is safe with no pathogens and rich with nutrients. Nitrogen and Phosphorus are the sought after nutrients in the planting soil industry, creating value for this material as a soil additive. There are also benefits from organic components in the material resulting from the original biological material.

Having a basic material (PH is higher than 7) from the lime content is an advantage as a soil amendment to help balance out acidic soil as well as fertilize. Acidic soil is found across the U.S. as a result of acid rain and other natural or manmade conditions. There are small treatment plants that will give this material away to locals as a free fertilizer for gardening. Some moderately sized facilities have contracts with farmers that can use the material to balance out soil and fertilize without buying costly lime and fertilizer additives. Contracts have also been established to sell the end product to golf courses in Florida, a region known to have highly acidic soil. Balancing the PH and providing a healthy fertilizer for the greens, while reducing maintenance costs.     

Click Here to Learn More

Tags: Class 'A' Biosolids, Biosolids, Bioset Class A, Fertilizer Replacement

Schwing featured on 21st Century Business TV Series

21st Century Business


November 12, 2009 - CNBC                                           

Click Link for Airing Schedule - 

Boca Raton, FL, --- Multi-Media Productions (USA), Inc. announces that Schwing Bioset, Inc. will be featured on 21st Century Business.

Schwing Bioset, Inc. (SBI) was created in 2006 by spinning off the Material Handling Division of Schwing America into its own company. The new company was created to better focus on meeting the unique needs of the wastewater treatment industry. In addition, the spin off afforded Schwing Bioset, Inc. the ability to leverage its two-decades of successful wastewater treatment installations at Schwing America into an aggressive pursuit of alternative "green" solutions in the wastewater treatment industry.

In 2006, SBI opened a new 20,000 square foot engineering and manufacturing facility in Somerset, WI in order to rapidly expand its service offerings. The "Bioset Process" and Fluid Bed Drying technology are two examples of Schwing Bioset's commitment to delivering innovative and environmentally friendly solutions to the wastewater treatment industry.

SBI's Project Management and Fluid Bed Drying teams remain in their respective locations of Danbury, CT and Houston, TX. Schwing Bioset's mission is simple, to become the market leader in the biosolids  and beneficial reuse industry.

For more information, visit

JL Haber, Vice President of Programming at Multi Media Productions, adds, "Schwing Bioset is an exciting company with a unique mission. We are excited to have them as a guest on our program."

About 21st Century Business

21st Century Business airs on CNBC and the Fox Business Network as paid programming. 21st Century Business may also be viewed through video on demand via The 21CBTV Series is also available at more than 90 prestigious universities, including Carnegie Mellon University, Howard University, Dartmouth College, and Georgetown University.

For specific market-by-market air dates and times, please e-mail For more information, please visit

Tags: Bioset Process, Fluid Bed Drying, Beneficial Reuse, Biosolids, Schwing Bioset