News from Schwing Bioset

Capital Idea for Biosolids Processing at Springfield Wastewater Treatment Plant

 

Written by Larry Trojak, Trojak Communications

Version also published in WE&T Magazine, December 2019

 

Springfield, Ill., wastewater treatment plant supplements its sludge disposal effort with a pair of screw presses and alkaline stabilization.

Effective wastewater treatment is predicated on equal parts science and planning. The science element of that premise includes keeping abreast of the latest technology to best manage both the treatment and disposal of biosolids. For the Sangamon County (Illinois) Water Reclamation District, that has meant rethinking its approach to biosolids, particularly in the area of dewatering prior to land application. Once solely dependent upon liquid applying its Class B byproduct, the District’s Sugar Creek Wastewater Treatment Facility recently upgraded its process to include a pair of fully-automated screw presses and a Class B alkaline stabilization system from Schwing Bioset, Inc. (Somerset, Wis.). Today, with a viable option to that liquid process in place, the plant is generating more than 17,000 lbs. of Class B cake monthly, and has peace of mind that its biosolids effort is poised for future growth.

 

Schwing Bioset Screw Presses   Schwing Bioset Screw Presses

 

A Pair of Plants

In addition to being the state capital, the city of Springfield (and immediate surrounding areas) hosts scores of facilities related to a booming agribusiness industry. These include one of the nation's largest stockyards and feeder cattle facilities, as well as various creameries, meatpacking plants, flour mills, etc. To meet the demands these and other industries place on the area’s wastewater system, a pair of treatment plants were built: Spring Creek in 1928 and, to accommodate area growth, a sister plant, Sugar Creek, in 1972.

“Since that time, both plants have been retrofitted to better handle increased volumes,” said Steve Sanderfield, Sugar Creek’s plant supervisor. “Spring Creek is by far the larger of the two with an average flow of 32 mgd and a peak of 80 mgd. Here, we average 15 mgd and top out at 37.5 mgd, so our max is really only 5 million gallons more than their average. Spring Creek has been updated every couple of decades, but this plant had remained fairly constant until a 2017 upgrade which resulted in a 50% increase in both the average and peak flows. That upgrade also paved the way for the current change to the dewatering effort.”

The most recent changes were improvements for flow control and diversion to wet weather treatment facilities that included mechanically cleaned perforated plate fine screens, grit removal tanks, and activated sludge tanks designed to meet both current and future effluent phosphorus limits.

 

A Better Alternative

In addition to the changes mentioned above, the biosolids area also underwent a significant upgrade, including those areas for thickening, stabilization, dewatering, and storage. Until those changes were made, Sanderfield said they had only one option for disposing of the sludge created in their treatment process.

“Since the mid 1990s, to meet 40CFR Part 503 requirements for Class B Biosolids, we post-stabilized liquid sludge (1.5% TS) by adding standard hydrated lime in a slurry,” he said. “Batches of the biosolids/lime mix were held in batch mixing tanks for 24 hours, after which (if they met 503 pH requirements) they were land-applied on a 30-acre farm owned by the District. If the batch pH dropped overnight below the acceptable standard, it would have to be “re-limed” and given another 24 hours to achieve the requirements within the standards. The stabilized liquid sludge was then pumped and spray-applied through a series of fixed irrigation nozzles installed throughout the farm. Because it is a liquid-sprayed application, large sludge storage tanks are required for times when field limitations (wet seasons, frozen ground, etc.) prevent application.”

While it was less expensive to apply the stabilized sludge in liquid form, those shortcomings prompted a re-thinking. Taking a page from their sister plant’s playbook, they began looking into options for dewatering prior to land application.

“Spring Creek was already dewatering with screw presses and sending the dewatered product to a pad for drying and eventual land application,” said Sanderfield.” However, because our process differs from theirs — aerobic versus anaerobic — and we saw some shortcomings in the presses they use, we decided to look at what else was out there. Vendors were invited to show us their products and, after an impressive two-week pilot test and subsequent bid process, we chose a pair of FSP 1102 screw presses from Schwing Bioset.”

 

Schwing Bioset Municipal Pump   Schwing Bioset Storage Silo

 

Two Are Better Than One

The model of presses in place at Sugar Creek represent one of the largest designs Schwing Bioset offers. Low speed by design, they offer dewatering results comparable to high speed centrifuges and — by nature of that slow speed and robust construction — provide a much longer lifetime of service. Sanderfield was particularly interested in one feature of the screw press: a split-screen cage that both simplifies screw removal and minimizes footprint requirements. The split cage allows the sealing lip and screen to be replaced with the screw in place — much simpler than removing the screw from one end of the machine.

“Once we knew the press would give us the product we needed, we tended to focus on the upkeep side of things,”
he said. “For example: how easy would the units be to repair if one of them went down? How self-cleaning is it? What kind of wear items does it contain? That last point was important to us. The presses at Spring Creek utilize brushes that wear down and, once they do, we have to pull the entire screw out to change them. That’s a huge undertaking we wanted to avoid over here.”

Immediately after the pilot test, Sanderfield was impressed with the self-cleaning process for the Schwing Bioset
presses. Unlike the units at Spring Creek which simply spray as the disc rotates and must be done when the unit is
not de-watering, these utilize a low-volume, high-pressure spray ring that tracks down the length of the screw — during operation.

“This approach is so much better than others we’ve seen,” he said. “Our dewatering operation does not need to be
interrupted for cleaning, and the cleaning cycle is typically only three to five minutes long, once per day. We’ve also
found that after a thorough cleaning the presses can sit for a while and, when they are needed, will be in operation
immediately — nothing hardens up in the lines. Because we don’t run the presses continuously here at Sugar Creek, that was important to us.”

 

Strength in Numbers

Although Sugar Creek never intended to run both presses at once, they nevertheless opted to go with two units rather than just one, based on equal parts the desire for redundancy and an eye toward future growth.

“For us, the purchase of the second press was definitely driven by the need for a backup,” said Sanderfield. “We
are in a situation here where a press failure or, more likely, one of the pumps we have feeding each press, would be
catastrophic to the process. That’s no longer a concern for us. In addition, as this area continues to grow, we are better poised to meet that growth without the need for any major overhaul.”

At Sugar Creek, sludge enters the press at roughly 1.3% solids, mixes with a polymer, and exits at 25 to 30%
dry solids. While they are extremely pleased with those numbers, Sanderfield is quick to point out that, as with any
press system, they have to take additional steps to deal with the filtrate. “The filtrate tends to be high in ammonia
and phosphorus, so it’s considered a side stream,” he said. “When we bring that back to the plant we have to be certain to do so slowly. So when the presses run, the filtrate that is getting squeezed out is pumped back at a slow rate and is controlled by the tank level. So, if we program it to start pumping when it’s at five feet and stop when it is at three feet, that’s what it will do.”

 

Push of a Button

Sanderfield’s allusion to equipment autonomy is telling. Automation of the presses was also a huge consideration
for Sugar Creek when making their purchase decision, and Sanderfield said they are very pleased with the level
of self-operation the 1102’s can maintain. 

“We start and stop it, monitor it, and run tests on the solids as it comes out,” he said. “But, for the most part, we are
able to hit ‘start’ and the sludge pump will control the feed rate that we set, the presses will do their thing, the
polymer will activate — it essentially runs itself and fits perfectly with the rest of the process which is also heavily
self-operating.”

From the screw press the biosolids still needed to be treated per the EPA 503 to Class B levels. The project
had already started down the path to utilize another technology, but after piloting the Schwing Bioset alkaline
stabilization technology with the screw press, the project switched gears. The biosolids are now routed from the
screw presses to the Class B lime system (also supplied by Schwing Bioset) where quicklime is introduced to
stabilize the dewatered biosolids by elevating the pH. 

“As with the liquid application, according to EPA 503 we cannot field apply the material until we’ve met the 24-hour
pH criteria,” said Sanderfield. “Doing so eliminates the risk of rodents, birds, animals, etc., coming in contact with
the sludge and possibly transferring diseases to other animals or people. Once we’ve stabilized it in the lime
system that’s no longer an issue.”

And, with an eye toward the future, Sugar Creek’s Class B lime system is also designed to facilitate expansion into a Class A Bioset alkaline stabilization process, should they choose. After treatment in the lime system, sludge — now with the consistency of a slightly wet modeling clay — is conveyed to a drying pad where it gets regularly turned using a skid-steer loader with a Brown Bear windrow turning attachment; once fully dried, it is ready for land
application.

 

Just Gets Better

If things seem to be going great for the team at Sugar Creek, it’s because they are. They just wrapped up a
well-attended open house for area residents and local officials, they are meeting all the necessary biological and
phosphorus thresholds without the use of chemicals, and they were just recently nominated for Plant of the Year in
Illinois.

“That last fact — a nomination for Plant of the Year — is mind-blowing, given that we’ve only been online for over a
year,” said Sanderfield. “Things were crazy here for quite a while, but we are now settling in to a nice routine and the Schwing Bioset presses and alkaline system have helped provide a lot of that peace of mind. We will still do both solid and liquid land applications of the sludge — that’s always been the plan. But, since we can press in five days what would probably take us three weeks to do otherwise, the process is far more efficient than it’s ever been.”

 

Click here to read more about our Products, then contact us to learn more about this project or find out how we can help your plant too.

 

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Tags: Alkaline Stabilization, Wastewater Treatment Plant, screw presses

Schwing Bioset Exhibiting at Water & Wastewater, Mining, and Industrial Trade Shows in 2020

 

Schwing Bioset, Inc. is excited to be attending and exhibiting at several conventions and expos throughout 2020. If you'd like to meet with one of our team members at a show, please email us and we'll put you in touch with the appropriate person.

Below is a list of water, wastewater, mining, and industrial events that we are scheduled to attend for the coming year, and we will keep this information updated as we add shows throughout the year. 

Products that you can learn about at the trade shows include, among others, sludge, industrial, and tunnel piston pumps, dewatering screw presses, membrane bioreactors, Bioset process equipment for Class A biosolids, phosphorus removal and struvite recovery, sliding frame and push floor silos, fluid bed drying products, container wagons, and soil conditioners. We can also help you with equipment demos, mobile equipment, spare parts, equipment maintenance services, and customer pump and screw press training. 

For more than 30 years, Schwing Bioset, Inc. has been helping water and wastewater treatment plants, mines, and industrial customers by engineering solids handling solutions. Schwing Bioset’s custom-engineered solutions can be found in hundreds of wastewater treatments plants in North America, as well as mines and tunnels around the world.

Read about our company, our products, our aftermarket team, and more, and then stop by one of our booths to learn more! 

Trade Show Date Place
NYWEA Annual Meeting & Expo 2020 Feb. 3-5 Marriott Marquis, New York City, NY
Michigan Joint Expo 2020 Feb. 4-5 Lansing Center, Lansing, MI
SME MineXchange 2020 Feb. 23-26 Phoenix Convention Center, Phoenix, AZ
MRWA Technical Conference 2020 March 3-5 River's Edge Convention Center, St. Cloud, MN
Salon TEQ 2020 March 10-11 Quebec City Convention Center, Quebec City, QC
Membrane Technology Conference & Expo 2020 March 16-20 Phoenix Convention Center, Phoenix, AZ
WEF Residuals & Biosolids 2020 March 31 - April 3 Minneapolis Convention Center, Minneapolis, MN
Texas Water 2020 March 31 - April 3 Fort Worth Convention Center, Fort Worth, TX
CWEA (NWEA) Annual Conference 2020 March 31 - April 3 Reno-Sparks Convention Center, Reno, NV
Alabama/Mississippi Water Joint Annual Conf. 2020 April 5-8 Arthur Outlaw Convention Center, Mobile, AL
Arizona Water Annual Conference 2020 April 14-16 Phoenix Convention Center, Phoenix, AZ
FWRC 2020 April 26-29 Palm Beach Cty Convention Center, West Palm Beach, FL
Powder Bulk Solids 2020 April 28-30 Donald E Stephens Convention Center, Rosemont, IL
KY/TN Water Professionals Conference 2020 July 19-22 Chattanooga Convention Center, Chattanooga, TN
Tri-State Seminar 2020 August 10-13 South Point Hotel & Casino, Las Vegas, NV
PNCWA 2020 Sept. 13-16 Spokane Convention Center, Spokane, WA
WaterJam Virginia 2020 Sept. 14-17 Hampton Roads Convention Center, Hampton, VA
MinExpo 2020 Sept. 28-30 Las Vegas Convention Center, Las Vegas, NV
WEFTEC 2020 October 5-7 New Orleans Morial Convention Center, New Orleans, LA

 

Schwing Bioset Trade Shows   Schwing Bioset Trade Shows

 

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Tags: Announcements, Events, WEFTEC, Expos

Schwing Bioset Trailer Mounted FSP 1103 Screw Presses Now Available for Contract Operations

 

Written by Kelly Kramer

 

Schwing Bioset is pleased to announce that we can now help solve your dewatering challenges with our fully automated trailer mounted FSP 1103 screw press dewatering systems. Available for onsite demonstrations and/or contract operations, the 1103 screw press is one of our largest models and is engineered for durability, reliability, ease of operation, and low power consumption, making the units an efficient method to dewater.

As with all of our screw presses, our mobile units are designed for quick set up, ease of use, and high-performance for dewatering all types of wastewater. 

One of the screw press features our customers are most excited about is the self-cleaning wash cycles. With low wash water requirements and automation, dewatering operations do not need to be suspended during cleaning and a cleaning cycle typically lasts less than five minutes.

Once dewatered, the solids can be treated, loaded, hauled away, and/or beneficially reused, depending upon the method of the end user.

For more information on our mobile screw press units, please contact our Regional Manager nearest to your plant. The screw press and Schwing Bioset’s full product offering can be viewed here.

 

Schwing Bioset Mobile Screw Press   Schwing Bioset Mobile Screw Press

 

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Tags: Wastewater Treatment, Screw Press, Dewatering, Mobile Screw Press

Screw Press Proves Efficient in Dewatering MBR Sludge

 

Written by Tom Welch

Version also Published in TPO Magazine, August 2019

 

The Decatur, AR, WWTP had existing dewatering technology that proved to be undersized and inefficient. With the additional demands of a new plant upgrade, Operations staff were struggling to meet current dewatering requirements.

The Design Build team and Owner selected an FSP 802 screw press from Schwing Bioset to replace the existing equipment. The new equipment was installed in the same building with primarily service connection modifications. The screw press started operating in November of 2018.

The improvements in the dewatering operations are remarkable, as it is saving Decatur operational expenses in every category. Dry solids content of the dewatered biosolids have improved from an average of 13% to 17%, resulting in less cake to haul. Solids capture rate has improved from less than 80% to 95%, resulting in a lower return load to the plant. Polymer usage is now at 18 pounds active per dry ton, which is well below the consumption rate of the previous technology reducing polymer expenditures.

In addition to these performance improvements, the dewatering capacity has more than doubled. Where it used to take at least two days to load a 25-ton trailer, the plant can now fill a trailer in 6.5 hours, reducing operator efforts in turn. 

With the widest range of machine sizes for several applications, and mobile pilot units available for testing your materials, Schwing Bioset is your comprehensive solutions provider for dewatering.

Click here to learn more about our products or contact our regional manager closest to you.

 

Decatur Dewatering Screw Press

 

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Tags: Biosolids, Screw Press, Dewatering, Membrane Bioreactor

West Rankin Utility Authority to Install Three Schwing Bioset Screw Presses

 

Written by Kelly Kramer, October 2019

 

The West Rankin Utility Authority (WRUA) provides services to several communities in Western Rankin County in Mississippi. WRUA generates approximately 10 to 12 million gallons of wastewater each day, which is currently transmitted to the Savanna Street Wastewater Treatment Plant in Jackson. To take advantage of this service, the authority has to pay Jackson, which costs it a few million dollars each year.

In an effort to save costs in the long run, and operate independently, WRUA has decided to build a brand-new wastewater treatment plant of its own. Schwing Bioset is pleased to announce that our team will be part of this project, with WRUA ordering three of our largest dewatering screw presses, the model FSP1203’s.

The FSP 1203’s are designed to handle a capacity of up to 7,468 dry pounds per hour. For West Rankin, the expectation is to process 24 dry tons per day operating at 60 hours per week, dewatering of 0.75% solids WAS with a 17% solids sludge cake output, and a ≥ 90% solids capture rate.

Schwing Bioset Screw Press     Schwing Bioset Screw Press

The West Rankin screw press system is designed for continuous dewatering of flocculated slurry and consists of a screw press dewatering unit, a flocculation tank, a rotary lobe sludge feed pump, and a liquid polymer blending system. Slow movement and the high-quality design of the structural components guarantee a high service life, and the back-washing cycle cleans the screens automatically so dewatering operations will not be interrupted during washing cycle.

With the new equipment in the new wastewater treatment plant, Schwing Bioset will be able to help West Rankin to bring its system into compliance with federal water quality laws, increase plant capacity, and save on costs in the long run.

To learn more about Schwing Bioset’s dewatering screw presses, contact Chuck at cwanstrom@schwingbioset.com or visit our website.

 

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Tags: Screw Press, Dewatering, Wastewater Treatment Plant

Membrane Bioreactors Increase Effluent Quality at Hotel and Casino

 

Written by Surya Pidaparti

 

The Santa Ynez Band of Chumash Indians operates a hotel and casino in Chumash, California. The sewage from the facilities used to be treated by a conventional sequencing batch reactor (SBR) and sand filtration. As the hotel and its vicinity expanded, the existing SBR was not able to treat the increased flow, which was the major driving force for upgrading the facility. As the area is a high drought zone, a requirement of any permit for expanding the hotel would require water reuse.

Two options were selected to evaluate for the wastewater treatment expansion project – an expansion of the existing SBR alongside the existing and abandoning the SBR in favor of a Membrane Bioreactor (MBR) system. An extensive engineering evaluation showed that the MBR system had a total construction cost of $3.3 million versus a cost of $5.3 million for the SBR.

Econity MBR’s were selected, as offered by Schwing Bioset, for not only their performance, but their flexibility in design. With a cartridge and cassette configuration, maintaining the membranes becomes a simple exercise. The MBR system was built using two containers to minimize disruptions to current plant operations and to fit in the limited site space available. The facility was commissioned in January of 2016.

With the improvements, there has been a significant increase in the facility’s capacity all while showing that that the effluent quality, measured in turbidity (0.05 – 0.2 NTU) vastly exceeds California Title 22 requirements for reuse water (< 1NTU).

To learn more about Schwing Bioset’s MBR systems, contact Surya at spidaparti@schwingbioset.com or visit our website here.

 

Schwing Bioset Membrane Bioreactors  Schwing Bioset Membrane Bioreactors

 

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Tags: Wastewater Treatment, Membrane Bioreactor

Schwing Bioset Custom Solutions Featured at WEFTEC 2019 Exhibit

 

Written by Kelly Kramer, August 2019

 

Schwing Bioset, Inc. (SBI) is once again exhibiting at the 2019 WEFTEC Technical Expo in Chicago on September 23-25. Please be sure to stop by our booth (#2307) while you're on the exhibit floor to see our equipment in person, check out product videos, and learn about how we help water and wastewater treatment plants. This year we will be showcasing several pieces of equipment.

Schwing Bioset is your complete solids handling provider, offering the widest range of high-performance screw presses, one of which will be displayed on the WEFTEC floor. Our screw press offers dewatering for those needing a cost effective, durable, efficient dewatering to reduce their volume of biosolids.

We will also be displaying our Membrane Bioreactor (MBR) filtration systems that utilize hollow fiber membranes and help eliminate fouling. The units are customizable for new applications or drop in replacements are available for existing membranes.

Nutrient Recovery is becoming increasingly important and our phosphate management technology, offered under license from NuReSys, that recovers orthophosphate in the form of struvite, will also be on display.

Other equipment on display will be a sliding frame, biosolids piston pump, and a Bioset reactor. The Bioset system is configurable to produce either Class A or B Biosolids, while each unit in the system is completely customizable to fit each plant.

Featured in the Technology Center will be our Fluid Bed Dryers, Container Wagons, SBI Solutions, and our material hauling services. Struvite and fertilizer material samples will also be displayed.

“As always, we are looking forward to WEFTEC 2019.  This is the perfect place to showcase the quality of our equipment and its unique and specific features that separate us from other options in the market,” said Chuck Wanstrom, Director of New Business Development.

The SBI team members attending the show include Executives, Regional Sales Managers, Service and Aftermarket Department personnel, and more. We’ll also be joined by members of our partner companies, including Revinu, NuReSys, Econity, and The Andersons, Inc. If you would like to meet with any of these team members, please email us and we'll put you in touch with the appropriate person to assist with your needs.

Be sure to follow the Schwing Bioset, Inc. social media sites to see what we’re up to at the show. In the meantime, read about our MBR’s, Nutrient Management, Dewatering Equipment, Piston Pumps, Bioset Process, and other products hereand then stop by booth 2307 to learn more! You can also visit the conference website to view the event details, an expo map, a list of exhibitors, and more: http://www.weftec.org.

We are excited to see you at WEFTEC 2019!

Schwing Bioset WEFTEC 2019   Schwing Bioset WEFTEC 2019

About Schwing Bioset, Inc.

For more than 30 years, Schwing Bioset, Inc. has been helping wastewater treatment plants, mines, and industrial users by engineering solids handling solutions. Schwing Bioset’s custom-engineered solutions can be found in over a thousand facilities across North America and around the world.

Our products include, among others, sludge, industrial, and tunnel piston pumps, screw presses, nutrient removal and management, membrane bioreactors, sliding frame and push floor silos, fluid bed drying products, Bioset process for Class A Biosolids, container wagons, and screw conveyors. We also offer on-site demos, spare parts and equipment maintenance services, and training. 

 

 

Tags: Announcements, Events, WEFTEC, Expos

Recovering a Valuable Nutrient From the Wastewater Stream

 

Published in TPO Magazine, August 2019

 

Phosphate recovery technology offered by Schwing Bioset can be tailored to meet each facility’s specific operating challenges

 

Resource recovery is a major trend in wastewater treatment — to the task of cleaning water, facility teams are adding the capture of energy and nutrients.

One increasingly popular type of technology is the capture of phosphorus as struvite, which has market value as a fertilizer additive. One entry in that sector is Schwing Bioset, which offers a phosphate and nitrogen recovery technology under license from Belgium-based NuReSys.

The offering is unique in that it is not necessarily designed to extract revenue from nutrient capture, although that option is available. The process is designed to be tailored to each facility’s objectives in dealing with phosphate-related issues.

Besides nutrient recovery, the process has the benefits of preventing buildup of struvite scale in treatment equipment and improving dewaterability in biosolids. Wim Moerman, chief technology officer for NuReSys, and Chuck Wanstrom, director of new business development with Schwing Bioset, talked about the technology in an interview with Treatment Plant Operator.

 

Click here to read the full interview.

 

Nutrient Management Plant

 

To learn more about Schwing Bioset’s Nutrient Management solutions, visit our website here or contact your Region’s Representative.

 

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Tags: Wastewater Treatment, Struvite Recovery, Nutrient Recovery, Phosphorus Removal, Nutrient Harvesting

Storage Silos for West Palm Beach Improvement Project

 

Written by Tom Welch

 

The East Central Regional Water Reclamation Facility has a rated treatment capacity of 70 million gallons per day and serves the cities of West Palm Beach, Riviera Beach, and Lake Worth; Palm Beach County, and the Town of Palm Beach.

Prior to the anaerobic digestion improvements, the plant utilized sludge decanting to concentrate solids to 2%, aerobic digestion to partially destroy solids, and belt press dewatering to remove excess water from biosolids, with dewatered cake hauled to the Solid Waste Authority – Palm Beach County (SWAPBC) Pelletizer Facility.

To help improve the plant’s processes, the anaerobic digestion project included mechanical sludge thickening to concentrate solids to 5%, temperature-phased Anaerobic Digestion to destroy more solids, and centrifuge dewatering to remove more excess water. 

Key to the whole process are new state-of-the art sliding frame sludge storage silos from Schwing Bioset that offer the plant flexibility in its operations by providing buffer capacity between the centrifuges and trailers. Sliding frame technology has largely displaced older live bottom truck loading technology at the wastewater plants as it holds many advantages, including; vertical sidewalls, no exterior ribbing required for structural integrity, very few and simple components for O&M activities, and flexible unloading configurations to accommodate variable trailer sizes. Once the dewatered Biosolids are loaded in trailers they continue to be transported to the SAWAPBC. 

Schwing Bioset Sliding Frame Silos           Schwing Bioset Biosolids Truck Loading

 

Schwing Bioset provided a quantity of four, 55 cubic yard silos with a truck loading conveyor for efficient truck loading. Overall the project reduces hauled biosolids by 15,000+ wet tons per year and reduces truck hauling costs and trips from the plant to SWAPBC.

To learn more about Schwing Bioset’s sliding frame silos, visit our website here or contact your Region’s Representative.

 

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Tags: Sliding Frame Silos, Truck Loading, Wastewater Treatment Plant

Screw Presses Help Plant Reduce Maintenance Costs

 

Written by Chuck Wanstrom

Version also Published in TPO Magazine, August 2018

 

The city of Bradenton, Florida, operates a wastewater treatment plant that processes roughly 8 million gallon per day. The plant had historically aerobically digested their biosolids and dewatered them to 15% dry solids content using two, 2.0-meter belt filter presses. Due to the age of the belt filter presses, the maintenance expenditures were continually increasing and were creating a burden not only with expenses, but also with personnel time to keep the equipment functioning.

Bradenton began a search to identify new dewatering techniques that could replace the aging belt filter presses.  Several pilot studies were completed, and Schwing Bioset was invited to run our screw press pilot. The pilot proved successful with results of up to 21% dry solids. The Schwing Bioset screw presses were also able to fit within the confines of the available space on the second floor of the existing dewatering building. 

The Schwing Bioset equipment was chosen as the best value and was procured under a sole source contract. The two new FSP902 screw presses were designed into the existing dewatering building and were commissioned early in 2018. The dewatered biosolids exceed the old belt presses cake performance and reduces the city’s hauling and disposal costs while at the same time reducing the amount of wash water required and significantly reducing the maintenance load to city staff. 

Learn more about our screw presses or contact our regional manager closest to you.

 

Bradenton Screw Presses

 

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Tags: Biosolids, Wastewater Treatment, Screw Press, Dewatering, screw presses