News from Schwing Bioset

USEPA PEC Committee Grants PFRP Approval to the Bioset System

The USEPA PEC Committee Grants Nationwide PFRP Approval to Schwing Bioset and Its Class 'A' Biosolids Process known as the Bioset System

After extensive testing and research, Schwing Bioset is proud to announce that the USEPA has given nationwide approval to the Bioset Process to reduce its operating temperatures from 70°C (158°F) to 55°C (131°F) as a Process to Further Reduce Pathogens (PFRP). Operating at 55°C (131°F) results in a greater than 20% reduction in operating costs for owners of the Bioset process.

Somerset, WI 2011

After extensive testing and research, Schwing Bioset is proud to announce that the USEPA has given nationwide approval to the Bioset Process to reduce its operating temperatures from 70°C (158°F) to 55°C (131°F) as a Process to Further Reduce Pathogens (PFRP). Operating at 55°C (131°F) results in a greater than 20% reduction in operating costs for owners of the Bioset process. Prior to receiving nationwide approval, site-specific approval at one site in Texas had been granted.

The Schwing Bioset Process is a technology that continuously converts municipal biosolids into a Class A/EQ saleable product in full compliance with 40 CFR Part 503 Rule. The process mixes dewatered biosolids with calcium oxide (quicklime) and sulfamic acid (solid granular acid) and continuously pumps it into a plug flow reactor. The Schwing Bioset Process currently meets Class ‘A’ standards via pasteurization at 70°C for 30 minutes, and vector attraction reduction by maintaining an elevated pH.

At the elevated pH levels, ammonium contained within the biosolids evolves as ammonia, and the ammonia is maintained in solution with the biosolids in the pressurized plug flow reactor. Miscible contact of the ammonia with the biosolids enhances pathogen destruction to Class A/EQ standards at lower temperatures. Mixing is accomplished with Schwing Bioset’s twin-screw feeder and the blended material is pumped into the plug flow reactor with Schwing Bioset’s twin- cylinder positive displacement piston pump.

The combination of high temperature, high pH and the biocidal effects of ammonia ensure that the biosolids are pathogen free in accordance with Class A/EQ requirements. The end product is characterized as a lime enhanced soil amendment and is a valuable product for numerous land application markets. Because the Calcium in the Class A/EQ end product is readily available, soil pH adjustment occurs in less than half the time of what typical agricultural lime products require. An additional benefit of the end product is that the high percentage of organic content (35-55%) returns organic material to depleted soils.


Tags: Class 'A' Biosolids, Piston Pumps, Bioset System, Municipal Biosolids, Class 'A' Materials, Screw Feeders, Biosolids

Wastewater Treatment: London, Ontario

The London Greenway Pollution Control Centre ("Greenway" for short) is the main wastewater treatment facility for the city of London, Ontario. Greenway is an activated sludge plant that also receives liquid sludge trucked in from the city's other five wastewater plants. 

new Greenway small

Greenway dewaters the sludge and relies on a fluid bed incinerator. In 2008, the incinerator required shutdown for major overhaul that would last over three months. The city's Wastewater and Solid Waste departments are separate entities and are required to charge each other for services rendered. After determining that a prolonged incinerator shutdown would have a prohibitive cost, the Wastewater Department sought alternatives.

Schwing Bioset piston pumps were previously installed at the Greenway plant to feed the dewatered sludge to the incinerator, so plant personnel were knowledgeable about Schwing Bioset capabilities. The Bioset process was proposed to treat the dewatered sludge to beneficially reuse the biosolids as landfill cover. Representatives from the Wastewater and Solid Waste departments visited Bioset installations in Florida to observe the process and it was determined the end product would be acceptable as landfill cover at a preferable cost.

A change order was issued to the incinerator rehabilitation contractor to install the Bioset process equipment as a back-up sludge treatment train to the incinerator. The component equipment permits flexibility in the layout design that allowed the plant to use distinct idle spaces so that no new structures were needed to accommodate the installation.

The plant processed 25,000 metric tons of Bioset product between August and December 2008 while incinerator rehabilitation work was completed. The city has since returned to incinerating the biosolids, but maintains the Bioset equipment as a back-up for annual shut-down/rehabilitation work.

Tags: Bioset Process, Piston Pumps, Wastewater Treatment

Six Piston Pumps installed at L.A. Waste Water Treatment Plant

Schwing Bioset Finalizes Installation of Six Piston Pumps at Hyperion Waste Water Treatment Plant (WWTP) in Los Angeles, California Without Interrupting Existing Operations.
Somerset, WI, August 10th, 2009 --- Schwing Bioset (USA), Inc. announces they are in the final stages of installing six KSP 50V(HD)XL Cake Pumps with SD 500 Screw Feeders at the Hyperion Waste Water Treatment Plan In Los Angeles, CA.
In August of 2007 Schwing Bioset was given a Notice to Proceed to construct the six KSP 50V(HD)XL Cake Pumps with SD500 Screw Feeders to replace competitive equipment that was in place. Installation of the replacement equipment had to be completed without interrupting plant operations, which required a phased installation and equipment-commissioning schedule. As of August 2009 all of the equipment was on site and being installed and commissioned.

In 1996 the City of Los Angeles competitively bid six large piston pumps each for conveying 100 gpm of biosolids at the Hyperion WWTP.  The biosolids are dewatered to an average of 32% dry solids content with required operating pressures up to 1,200 psi.  Whereas, Schwing Bioset, Inc. was not the low bidder, we were not awarded the contract.

The city experienced perpetual issues with the reliability of the pumps supplied by the low bidder affecting their ability to operate on their desired schedule.  After several unsuccessful years of trying to work out the issues with the low cost bidders equipment, the plant made the decision to abandon that equipment and replace it with equipment manufactured by Schwing Bioset. 

Dave Taylor, Senior Wastewater Treatment Operator, adds, “The confidence in the Schwing product has been illustrated by the field work performed by these Schwing team mates here at Hyperion."

About Schwing Bioset, Inc.

Schwing Biosets mission is simple, to become the market leader in the biosolids and beneficial reuse industry.  Their team of professionals has the skill and experience necessary to develop material handling solutions tailored toward the specific needs of their customers.

Please direct all media inquiries to Chuck Wanstrom, National Sales Manager, please e-mail 
wastewater pump

Tags: Piston Pumps, Biosolids, Wastewater Treatment