News from Schwing Bioset

We Dewater Water Plants Too - Part Two Alum Sludge

 

Written by Tom Welch, October 26, 2015

Seneca Light & Water, serving the region of Oconee County in South Carolina, operates a 20 million gallons per day (MGD) Water Treatment facility that uses the 18,500-acre Lake Keowee as its source.  The original plant started in March of 1969 as a 4 MGD facility and has advanced to the current rating with several upgrades.

The Seneca water plant uses aluminum sulfate as a coagulant to lower the turbidity of the water.  After a series of processes, the waste aluminum sulfate is dewatered so that as little water as possible is hauled away with the solids.  Historically, a plate and frame press had been used.  Although that equipment provided a reasonably dry product, about 24% solids, the equipment was only able to run in batch processes, was labor intensive, and was not a clean process to work with.

In 2012, Seneca began a search to identify new dewatering techniques that could replace the aging plate and frame presses.  Several pilot studies were completed, and Schwing Bioset was invited to run their screw press pilot in May of 2013.  The pilot proved successful with a result of 27% solids, which was better than the performance of the existing plate and frame press, as well as the other screw press that had been tested.  The Schwing Bioset equipment was chosen as the best value and the new FSP 0403 screw press was designed into the new dewatering building that was commissioned in September of 2015.

The dewatered alum sludge is hauled to the nearby wastewater treatment plant and mixed with the dewatered Biosolids and then hauled jointly to the landfill.  Now in normal production, the FSP 0403 screw press is producing 30% solids on average with a high of 34%, which is even better than the pilot results.  This is all being done with a polymer dose of 5 pounds of active polymer per ton, which has proven to be very cost effective thus far.

Seneca Light & Water has met their goal of replacing their aged plate and frame technology with a very energy efficient screw press that allows continuous processing. 

The new facility in Seneca, South Carolina, is Schwing Bioset’s second successful water plant startup in the Carolinas this year.

To read Part 1 of this blog, which discusses the screw press installation at a water plant using ferric, go here.

To learn more about our dewatering capabilities or this project specifically, contact this blog’s author, Tom Welch, and/or visit our website here: SBI Screw Presses. For other inquiries, call 715.247.3433, visit our website, or follow us on social media.

 

Schwing Bioset FSP 503 Screw Press Dewatered Alum Sludge

 

Tags: Water Treatment, Screw Press, Dewatering, Water Plants

Screw Press and Bioset Demo Leads to Treatment Plant Expansion

 

Written by Tom Welch, September 10, 2015

The Springfield, IL, Metro Sanitary District (SMSD) Sugar Creek Plant is going to be expanding over the next two years.  They currently have no dewatering capability and they treat their liquid sludge with lime and liquid land-apply on their own fields onsite at the plant.  In June of 2013, Schwing Bioset was invited to run a dual demo of their screw press and Bioset systems.  The pilot study was conducted for two weeks where the Waste Activated Sludge (WAS) was dewatered with the screw presses and then converted to a Class A EQ product through the advanced alkaline stabilization Bioset process.  Crawford, Murphy, and Tilly Engineers coordinated the pilot study for the District.

Prior to the pilot study, the plant operations team was leaning toward using belt presses for their future dewatering needs.  They had familiarity with belt presses and they were concerned that screw press technology did not have the capability to meet their requirements of 2660 dry pounds per hour without having to install a large number of screw press machines.  They were basing their concerns on historical screw press throughput capability based on their market research.

Springfield_Demo_Image_1-1

(Pilot Study Setup at SMSD Sugar Creek Plant)

During the pilot study, the Schwing Bioset team brought their FSP 600 screw press machine to dewater the partially aerobically digested WAS.  The goal was to dewater the material to the highest percent solids, with an excellent capture rate, and also with the least amount of polymer consumption.  The dewatered product would then be passed along to the mobile Bioset operation, which is an advanced alkaline stabilization process that can produce a Class A EQ Biosolid end product that can be utilized as a fertilizer or a soil amendment. 

The first week of the demo was utilized to optimize the screw press performance, and the second week to monitor continued performance of the screw press while utilizing the Bioset operation to produce a Class A EQ product. The purpose of this was to monitor the product over a couple month period to determine the stability of the Class A EQ product at the Springfield plant.  Over the two weeks, the FSP 600 screw press unit produced a dewatered product of 30% solids on average, even while operating the machine at 130-150% of design throughput capability.  After polymer optimization, the end result was realized with 14 pounds of active polymer per ton and the capture rate was above 95% during the entire two week period.  During the second week of the pilot, the Bioset system was utilized the entire time and was successful in producing the Class A EQ product.

Based on the successful results of the pilot, SMSD gave Crawford, Murphy, and Tilly the direction to design the new biosolids handling facility to include two high-performance screw presses, each capable of dewatering 1330 dry pounds per hour.  Although they liked the simplicity of the Bioset Class A operation, they were uncertain if the need for Class A was justified for the new facility.  They settled on a Class B Bioset system that utilizes all of the components of the Class A design, except for the reactor.  Space was left in the building to install the reactor in the future should Class A become necessary.  The job bid in December of 2014 and Schwing Bioset received an order for the two high-performance screw presses and the Class B alkalization system in early 2015. 

These FSP 1102 screw presses showcase the capabilities of high-performance screw presses and offer larger plants an appealing alternative to traditional belt filter press or centrifuge dewatering.

To learn more about our screw presses, Bioset process, and/or this project specifically, contact a Schwing Bioset Regional Sales Manager, call 715.247.3433, email us, and/or visit our website here.

Springfield_Demo_Image_2-1

(Class A EQ product at 44% solids)

 

 

Tags: Class 'A' Biosolids, Bioset Process, Alkaline Stabilization, Class AA/EQ Biosolids, Biosolids, Wastewater Treatment, Screw Press, Dewatering

We Dewater Water Plants Too – Part One Ferric Sludge

 

Written by Tom Welch, July 7, 2015

Although primarily thought of as a technology for dewatering in wastewater plants, Schwing Bioset’s screw press has also been successfully applied in water plants.  We recently completed an installation of a screw press at the Davidson Water (ferric sludge) water treatment plant. 

Take a look at part one of a two part article on the successful application of Schwing Bioset’s screw press technology on ferric and alum sludge generated by water treatment plants.

Davidson Water, Inc. is located in Lexington, North Carolina, and is a large membership cooperative with a plant capacity of 35 million gallons per day.  Upon successful pilot trials, Davidson Water selected the Schwing Bioset FSP 602 machine for dewatering its full scale operations.  They are now running at about 85% throughput and obtaining 27-30% solids, with greater than 95% capture rate and less than 20 pounds of active polymer per ton.  Recent operating conditions have achieved dry solids contents as high as 38%!

Davidson Water’s current operations are surpassing the performance demonstrated during on-site pilot trials that were completed almost two years ago and are exceeding their expectations.  Take a look at the photos below of the Davidson Water installation, which show the simple set-up and exceptional performance. 

Stay tuned for Part Two of 'We Dewater Water Plants Too' on dewatering the alum sludge for a water treatment plant in South Carolina.

To see video of the Screw Press in action or learn more about it, contact a Schwing Bioset Regional Sales Manager, call 715.247.3433, email marketing@schwingbioset.com, and/or visit our website here: SBI Screw Presses.

 

Davidson_Water_1 Davidson_Water_2 Davidson_Water_3

Tags: Water Treatment, Screw Press, Dewatering, Ferric Sludge, Water Plants

Schwing Bioset Exhibiting at WEF Residuals and Biosolids Conference

 

June 4, 2015

Schwing Bioset, Inc. will be exhibiting at the 2015 WEF Residuals and Biosolids Conference in Washington, DC, on June 8th and 9th.

Please be sure to stop by our booth (#106) while you're on the exhibit floor.

 

Visit the conference website to view the event details and exhibition map: http://www.residualsbiosolids-wefiwa.org/

Here is the Schwing Bioset listing for the show: http://app.core-apps.com/15rbwe/exhibitors/d4d3b4f759e0e3a5025efd0a3d0e4fc4

Learn more about our Bioset Process and Class 'A' Biosolids, Dewatering Equipment, Pumps, and other products here: http://www.schwingbioset.com/products

 

If you'd like to meet with one of our team members, please contact marketing@schwingbioset.com for the names of the team members who are attending the show.

We hope to see you there!

 

Bioset_Video_Screenshot

 

Tags: Class 'A' Biosolids, Bioset Process, Events, Biosolids, Wastewater Treatment, Pumps, Dewatering

Screw Press Adds Dewatering to Schwing Bioset Capabilities

Schwing Bioset is proud to announce the addition of a screw press dewatering system to their family of products.

 

Somerset, WI (PRWEB) January 19, 2013

A natural progression enabling clients to work with one dynamic solution provider to solve their biosolids management issues, Schwing Bioset has added Screw Presses to their family of products enabling them to help clients from dewatering to biosolids disposal.

Schwing Bioset Screw Press Dewatering Systems offer the features you want and performance you can count on. From low power requirements and unattended operation to high solids and high capture rates Screw Presses provide exceptional performance at a fraction of the energy and maintenance costs of other technologies.

With eleven models, each built to the same exacting standards, Schwing Bioset offers the widest range of model sizes available and can offer its customers, unlike competing technologies, the same high level of performance from top to bottom in the product line.

With over 65 machines in service and the Schwing Bioset name standing behind the technology for on-going support, municipalities now have a new option to provide superior dewatering performance for their biosolids.

screw press dewatering system

Tags: Biosolids, Schwing Bioset, Screw Press, Dewatering

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