News from Schwing Bioset

Humboldt WWTP Replacing Existing Belt Presses with Schwing Bioset Dewatering Screw Presses

 

Written by Kelly Kramer

The Humboldt Utilities Wastewater Treatment Plant has been serving Humboldt, TN, and the surrounding area of approximately 4,400 customers since 1939. For several years, the plant received the KY-TN Operational Excellence Award for continued outstanding  management and has a reputation for being one of the most reliable utilities in the area.

Humboldt currently uses a belt filter press and the dewatered solids are then hauled to a landfill for disposal. However, the WWTP is now adding a new biosolids dewatering building, in which Schwing Bioset is providing two new FSP803 screw presses, complete with a grinder, sludge feed pumps, reaction tanks, flow meters, polymer blending units, discharge chutes, valves, and controls.

Schwing Bioset performed a demo that was able to show that the Schwing Bioset dewatering screw press system is ideally suited to dewater the sludge at the Humboldt Utilities WWTP, achieving solids as high as 28.49% while maintaining capture rates in excess of 95%. Compared to normal operation of the belt press, with output solids ranging from 16-18% solids, the screw press provided much improved performance and a long term, more robust solution than the current belt press.

During the demo, the plant staff could see for themselves some of the key advantages of screw press technology compared to their existing belt press. Below is a list of some of these advantages:

  • Low maintenance costs.
  • Very quiet operation.
  • Extremely low power consumption, which means that new power feed equipment would not be needed for the new installation.
  • Easy startup, shutdown, and cleanup.
  • Excellent cake dryness and capture rate when used with the correct polymer.
  • Enclosed operation.
  • Very low wash water usage.

Schwing Bioset Screw Press    s7q9ZFV7e0AKZ0ep28hH

The Screw Press dewatering unit compresses and dewaters flocculated slurry using a screw rotating at very slow speed in a perforated screen and the filtrate will discharge from a drip tray below the perforated screen into a discharge pipe. Access doors allow a direct view of the dewatering process and the simple operating principle is achieved with only a few functional component groups. Slow movement and the high-quality design of the structural components will guarantee a high service life. And last, but not least, one of the greatest benefits is that the back washing cycle cleans the screens automatically (cycle lasts approx. 2-3 minutes) and dewatering operations are not interrupted during washing cycle.

The new FSP 803 screw presses are expected to process 300-800 dry pounds per hour with a minimum output of 20% solids and a 95% capture rate. The project’s start up date will be during the summer of 2021.

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

 

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Tags: Biosolids, Wastewater Treatment, Screw Press, Dewatering

Biosolids, Their Benefits, and Schwing Bioset Solutions

 

Written by Kelly Kramer

 

Sewage Sludge vs. Biosolids in Plain English

The terms ‘biosolids’ and ‘sewage sludge’ are often used interchangeably, but they are certainly not one in the same. 

Sewage sludge refers to the bodily waste we produce every day and the solids that are separated during the treatment of municipal wastewater generated in a treatment works. Sewage sludge is the raw material used to create biosolids, but at the wastewater treatment plant, those solids are then treated physically and chemically to produce a semisolid product known as biosolids.

Class A Biosolids

Biosolids are nutrient-rich organic materials, and through biosolids management, solid residue from wastewater treatment is processed to reduce or eliminate pathogens and minimize odors, forming a safe, beneficial agricultural product.

By the time they are applied to land, the waste has been treated and turned into a safe alternative to chemical fertilizer, now resembling a material more like soil. Biosolids are treated to meet standards set by EPA and state regulators and are regularly monitored.

The EPA categorizes biosolids as Class A EQ (Exceptional Quality), Class A/AA, and Class B. The difference between these types depends on the quality of the material and the distinction helps ensure safe use.

Class A EQ are the highest quality of biosolids and are approved for use in gardens that grow food. Class A biosolids are the next highest-level quality, can be applied to land safely with no restrictions, and are commonly used as compost or fertilizer. Class B biosolids are lower quality than Class A, but are still approved as a compost or soil improvement for farmland with permits and regular monitoring. For more specific information on Class A vs. Class B, take a look our previous blog post.

Biosolids are one of the most researched soil amendments on the market. Utilities, trade associations, and regulators are continually researching the benefits and effects of using biosolids.  

 

Benefits of Biosolids

Biosolids are a natural and endlessly renewable resource. Using biosolids reduces waste, recovers natural resources, generates renewable energy, lowers greenhouse gases, and improves the quality and health of soil.

Just some of the benefits that Biosolids provide include:

  • They are a natural and renewable resource and are loaded with nutrients that are better for the environment, including waterways, than chemical fertilizers.

  • Biosolids do more than just replace nutrients, they actually improve the health of the soil and allow for the slow release of key compounds like nitrogen and phosphorous. They help increase crop yields, boost plant growth, and promote rapid tree growth.

  • The production and use of biosolids reduces waste, reduces the production and need of chemical fertilizers, and beneficial reuse helps keep them out of landfills and incinerators.
  • Using biosolids lowers greenhouse gas emissions. Use on farms helps soil store carbon, which reduces greenhouse gases by keeping it out of the air.
  • Biosolids help create resilient local economies, and farmers save money by using biosolids because they are less expensive than chemical fertilizers.
  • Biosolids are an alternative to chemical fertilizers for healthy farm soils, community gardens, golf courses, and municipal parks, to name a few.
  • The production of biosolids allows utilities to create a natural fuel that can be used for heat and power. Using energy from biosolids helps with electricity demand.

Class A Biosolids

 

How Can Schwing Bioset Help Your Wastewater Treatment / Water Reclamation Plant?

Schwing Bioset is your complete biosolids management provider, helping hundreds of wastewater treatment plants around the world with our custom engineered solutions. We produce equipment that can treat, dewater, transport, and store biosolids.

Bioset Process (Treat)

The Bioset Process uses Alkaline Stabilization that produces Class A, Class AA, or Class AA/EQ Biosolids via the time vs. temperature equation and pH adjustment per the EPA 503 regulations. Temperature is achieved through the addition of sulfamic acid and high pH is achieved through the addition of quicklime. Biosolids and the additions are homogeneously mixed in a Schwing Bioset screw feeder and pumped through an insulated reactor.

Fluid Bed Dryers (Treat)

Fluid Bed Drying is our indirect-heated, thermal drying technology for producing Class A material from dewatered municipal wastewater treatment sludge. Based on the use of a fluidized bed dryer, the approach is to granulate and heat the biosolids within the dryer, and produce a dry, cool, dust-free material as the end-product.

Screw Presses (Dewater)

The Schwing Bioset screw press provides a state-of-the-art solution for wastewater plants and consulting engineers looking to improve their dewatering process. The Screw Press offers next generation dewatering for those wanting a cost effective, durable, efficient unit to reduce the volume of their biosolids. Dewatering results are similar to high-speed centrifuges, but with a fraction of the energy and maintenance costs.

Piston Pumps (Transport)

A broad range of Schwing Bioset pump systems with pumping rates exceeding 1000 gpm and pumping pressures over 3,500 psi on some models provide numerous possibilities for conveyance of materials previously considered un-pumpable. Our units pump sludge and dewatered biosolids from Belt Presses, Centrifuges, Plate and Frame Presses, and Rotary Presses with dry solids content up to 56%. 

Conveyors (Transport)

Screw conveyors are an efficient solution to collect, classify, transport, and distribute materials, or unload silos. Designed for use in demanding applications and to move a wide range of materials, the high-quality conveyors Schwing Bioset produces are available in multiple configurations to suit the challenges of every application.

Sliding Frames & Storage Silos (Store)

Sliding frame and push floor storage silos provide a low-cost method to store both large and small quantities of biosolids while awaiting final disposal. Silos can be used for intermediate storage, truck loading, or accepting foreign sludge hauled in from other plants as a truck receiving station.

Paragould AR_cropped 

To learn more about how we can help solve your plant’s challenges with Biosolids Management, visit our website or contact one of our Regional Managers.

 

References used in this post, and resources where you can find much more information, include:

Water Environment Federation (WEF)

A Plain English Guide to the EPA Part 503 Biosolids Rule

North East Biosolids and Residuals Association (NEBRA)

 

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Tags: Class 'A' Biosolids, Municipal Biosolids, Class AA/EQ Biosolids, Biosolids, Biosolids Management

New Piston Pumps Help Stabilize Metro Sewerage District Incinerator Operations

 

Written by Tom Welch

Version also published in TPO Magazine, March 2021

 

Piston pumps are used to feed dewatered cake solids to the incinerators at the Metropolitan Sewerage District of Buncombe County, North Carolina, located in Asheville, NC. The original pumps were supplied in 1993 and were sequentially replaced in 2005 and 2007. Due to the growth experienced in the area over nearly 30 years and the continued projected population increase, the pump capacity had to be nearly doubled in the most recent expansion. 

With nearly three decades of exemplary performance for the MSD, Schwing Bioset was again selected to provide the cake pumping equipment package and has recently supplied new KSP 17 piston pumps to feed the dewatered cake solids to the incinerators. The package has performed well for the wastewater plant.

The package included upsized feed hoppers with a delivery piping and actuated ball valve system that can feed either the incinerator or be bypassed to truck loading. To reduce pressure in the pipeline, Schwing Bioset’s proprietary pipeline lubrication design was incorporated to reduce line pressure, extend wear part lives, and minimize the power draw of the hydraulic power pack.

The original pumps had a single discharge line feeding the incinerators. The new pumps were delivered with a unique dual discharge system that splits the flow leaving the pump and enables the incinerator to be fed from multiple locations to stabilize incinerator operations. To accommodate EPA regulations, Schwing Bioset also provided its patented Sludge Flow Measuring System that measures pump output to within +/- 5% of the feed going to the incinerator.

 

Schwing Bioset Piston Pump   Schwing Bioset Power Pack

 

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: Piston Pumps, Wastewater Treatment Plant

Schwing Bioset is Excited to Offer Pump and Screw Press Service Seminar Trainings in 2021

 

Written by Trisha Bennett

 

The Schwing Bioset Training Team is excited to again begin offering our KSP Pump Level I, KSP Pump Level II, and Screw Press factory seminars in 2021.

We have appreciated everyone’s patience and understanding, as we were not able to reschedule our factory seminars in 2020. While eager to schedule these seminars, we have been developing a plan to maximize training participants’ safety while offering an effective training experience at our Florida Training Center.

The safety of Schwing Bioset customers, employees, and family members continues to be a number one priority for our company. We will continue to monitor the situation with COVID-19 and provide updates if anything changes.

About Our Service Seminars

Factory Service Seminars are our set curriculum for the KSP Pump Systems and Screw Press Systems. They are typically held at our Florida Training Center in sunny Ft. Myers, where customers will participate in classroom and hands-on training with our shop equipment. Curriculum is standardized and applicable for all customers that attend. Expect to get your hands dirty as we operate, perform maintenance, and troubleshoot common systems.

The KSP Pump Level I seminar covers Schwing Bioset’s KSP Pump systems’ equipment, operations, maintenance, and the basics of hydraulics. This seminar benefits anyone that works with our KSP Pump systems—whether in operations and/or maintenance. 

The KSP Level II seminar takes a deep-dive into Schwing Bioset’s KSP Pump Systems. This seminar focuses on the maintenance and troubleshooting of the KSP pump system, expands on hydraulics, and covers electrical procedures. This seminar benefits anyone that wants to learn more about troubleshooting and maintenance techniques and hydraulics. 

The Screw Press Service Seminar covers Schwing Bioset’s Screw Press Dewatering Systems. Attendees will be exposed to classroom and hands-on training, covering the equipment and its components, safety, dewatering process, operations, maintenance, and troubleshooting. This seminar benefits anyone that wants to learn more about the Screw Press Dewatering system, refine their skills in operations and/or maintenance, and understand the dewatering process to optimize their operations. 

Our onsite Service Seminars are customized to your facility’s equipment and system, and it is conducted at your facility. Similar to our Factory Service Seminars, customers can expect classroom and hands-on training. The advantage of our onsite training is that we customize our curriculum to cover the ins-and-outs of your equipment and systems. Our Training Team works closely with you to identify and meet your training needs.

How To Sign Up

Refer to our Service Seminar Webpage for seminar dates, information, and registration flyers. Registration is open as of January 29th. Get a discount when you register early! Purchase four or more seats (up to six seats per class) and get a guaranteed private class at our Florida Training Center.

Please note that our class sizes are limited to 6 individuals per class (so act fast!), and we are complying with CDC guidelines to prevent the spread of COVID-19. Attached to the training registrations are our COVID-19 Policies and Expectations, which must be signed and accepted at the time you register for the training.

Please contact Trisha (tbennett@schwingbioset.com) for more information, questions, to set up a training at your facility, or to get on our waitlist.

We look forward to seeing you in 2021!

Schwing Bioset Training Service Seminars  Schwing Bioset Training Service Seminars

 

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Tags: KSP Service Seminar, Training Classes, Screw Press Service Seminar

Bissell Point WWTP Expands Biosolids Handling Capability

 

Written by Tom Welch

Version also published in TPO Magazine, October 2020

 

The Bissell Point Wastewater Treatment Plant, owned by Metropolitan St. Louis Sewer District (MSD), is the largest wastewater treatment plant in metropolitan St. Louis, MO. Schwing Bioset had previously provided six (6) KSP 25 piston pumps with 50 HP power packs and a live bottom receiving station at the facility that have been in service since 1993. The piston pumps conveyed 25% dry cake solids to the multiple hearth incinerators, but due to the high amount of additional silt that makes its way through the plant via inflow and infiltration during wet weather events, the dry solids content can soar to over 40%. While this nearly 30-year-old equipment continues to perform admirably, MSD was seeking a solution for the biosolids produced at its satellite plants and wanted to utilize the excess incineration capacity at Bissell Point.

Due to the long and successful history with the current equipment at Bissell Point, MSD purchased a larger KSP 45 piston pump and piping system to transport the received solids into the facility, as well as a push floor truck receiving station with over 50 cubic yards of capacity from Schwing Bioset. The new system is able to handle a high volume of biosolids and complements the existing equipment.

Schwing Bioset Biosolids Piston Pump

Schwing Bioset worked closely with Donohue and Associates to design and provide the new biosolids receiving station for the WWTP. The new receiving station, designed utilizing push floor technology, allows dewatered biosolids to be received from other Metropolitan St. Louis Sewer District facilities so that disposal costs can be minimized by allowing the biosolids to be incinerated. Push floor technology was chosen over the incumbent live bottom as a more efficient and lower maintenance system that also improves material flow characteristics.

The push floor bunker design consists of two hydraulically-driven push frames that reciprocate along the bunker floor. The action of the frames breaks material bridging and feeds solids into the extraction conveyor, and rectangular bunkers allow multiple trucks to back up to and unload into the bunker simultaneously. The bin also includes a retractable bi-fold cover integral to the system when not receiving biosolids, which assists in containing odors and prevents rain, snow, and other tramp materials from falling into the bunker.

Schwing Bioset Receiving Station

As plant staff are already familiar with the equipment and its operation, integration into existing operations has gone smoothly and the new equipment provides MSD flexibility in their management of biosolids from within their service area into the future.

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: Wastewater Treatment Plant, Biosolids Piston Pump, Receiving Station

Dewatering with a Screw Press at Upper Sandusky WWTP

 

Written by Eric Wanstrom

 

The city of Upper Sandusky, Ohio, operates a wastewater treatment plant that processes roughly two million gallons per day. The plant had historically aerobically digested their biosolids and dewatered them to approximately 10% dry solids content using drying beds. Due to the age of the drying beds, the hauling costs were continually increasing, which was creating a burden not only in expenses, but also on personnel time to keep the beds functioning.

Upper Sandusky began a search to identify new dewatering methods that could replace the aging drying beds. While exploring several technologies and performing multiple pilot studies to determine the best technology, not only from a performance standpoint, but also considering ease of use and maintenance requirements, screw presses were determined to be the preferred technology. 

Schwing Bioset was invited to run our screw press pilot, which proved quite successful, with cake results exceeding 20% dry solids. Plant staff were also impressed with the quality of construction and the ease of use of the machine.

Schwing Bioset equipment was chosen as the best value and was selected as the basis of design for the new dewatering building. The new FSP603 screw press will produce over 80% dryer cake than old drying beds, reduce the city’s hauling and disposal costs substantially as a result of the increased solids content produced, and reduce the amount of labor required by city staff. 

Schwing Bioset FSP603 Screw Press  Schwing Bioset FSP 603 Screw Press

The Schwing Bioset screw press provides a state-of-the-art solution for wastewater plants and consulting engineers looking to improve their dewatering process. Offering the widest range of model sizes available on the market, our screw presses also come with a wide range of features designed specifically with the wastewater treatment plant operator in mind.

Contact us to learn more about this project or visit here to learn more about our dewatering screw presses.

 

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Tags: Wastewater Treatment, Screw Press, Dewatering

NuReSys, a Schwing Bioset Partner, is Helping to Create Valuable Products from Biowaste in Europe

 

NuReSys Nutrient Management

Written by Kelly Kramer

Schwing Bioset’s partner, NuReSys, has been chosen to be a key player in the European VALUEWASTE project, which is an integrated approach to urban biowaste upcycling. This project is funded by the European Union to examine numerous different ways to create value from what are otherwise waste products. Of the numerous technologies and processes evaluated for consideration to participate in the program, NuReSys technology was identified as being flexible in its design to expand applicability and was selected to participate in the study.

Because existing systems such as landfilling and incineration don’t use the millions of tons of biowaste in Europe to its full potential, several partners are coming together to bring the waste reuse project to life. NuReSys’ role is to help in developing the first complete solution to create valuable biowaste by recovering phosphate as struvite using various organic waste products from households, restaurants, and other sources.

NuReSys commissioned the equipment that will complete the program work in September of 2020, and received publicity on a local news broadcast promoting the VALUEWASTE project and the participation of NuReSys. The project started in November 2018 and will last into late 2022.

To read more about this project, visit the NuReSys website or the VALUEWASTE website, and then contact Schwing Bioset to find out how NuReSys technology can be applied within your plant to upcycle your waste.

 

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Tags: Beneficial Reuse, NuReSys, Nutrient Management

Pima County, AZ, Tres Rios WRF Biosolids System Upgrades - Part Three: Mobile Dewatering Equipment Rentals

 

Written by Josh DiValentino

 

Background: The district of Pima County, AZ, operates a total of eight wastewater treatment plants. The Tres Rios Water Reclamation Facility (WRF) is the centralized biosolids processing facility for all Pima County plants. Tres Rios WRF currently operates 24/7/365 at a 30 MGD capacity, with a projected flow of 50 MGD in 2030. The facility process is; BNR, Anaerobic Digestion, Dewatering, Pumping, Truck Loading, and Land Application of biosolids (cotton is a common use). For nearly 20 years, Schwing Bioset, Inc. has provided solids handling solutions at Tres Rios with projects ranging from biosolids cake pumping and cake storage bins, to most recently, nutrient recovery and temporary Screw Press dewatering equipment.

 

Mobile Dewatering Units: During the Summer of 2020, Tres Rios WRF needed to take down their entire centrifuge dewatering facility for contractors to install the second new Schwing Bioset Cake Pump. The pumping system details are explained in Pima County, AZ, Tres Rios WWTP Biosolids System Upgrades - Part One: Cake Pumping. Operations had to find a reliable solution to divert flow from the entire 30 MGD facility. Schwing Bioset again had an opportunity to help, providing our massive FSP1103 and FSP703 Screw Press dewatering trailers for temporary dewatering.

 

Pima County Tres Rios Dewatering Screw Press Rental


Thickened sludge was fed from the Anerobic Digester to both presses. Once the sludge feed was connected via cam-lock hoses, power connected to the trailer, and the drain lines hooked up, the Screw Presses were ready to run. Technicians dialed in the polymer dose, screw press floc tank pressure, screw rotation speed, and discharge cone pressure to optimize performance. The Tres Rios operations team could then to divert sludge flow to the temporary dewatering trailers, and each system is capable of the following throughput:  

 

FSP1103 Trailer: Anaerobic Sludge

3208 dry lbs. / hour (1455 dry kg / hour) up to 214 gallons /minute (810 liters / minute) at 3% solids


FSP703 Trailer: Anaerobic Sludge

1365 dry lbs. / hour (620 dry kg / hour) up to 90 gallons /minute (340 liters / minute) at 3% solids

 

The FSP Screw Presses provided reliable dewatering for the entire Tres Rios facility for a few weeks while the new cake pump was installed. The presses were able to produce cake and filtrate quality performance near the plants existing centrifuges, producing an average of 17% cake solids while running near design capacity. The FSP screw press dewatering systems offered this level of high-performance dewatering and are a simple, easy to maintain, low energy consuming package, even at high flow rates from big plants.

 

Pima County Tres Rios Dewatering Screw Press Rental  

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.

 

Read the previous Pima County Project stories and stay tuned for Part Four on Struvite Management:

Part One: Cake Pumping

Part Two: Live Bottom Bins

Part Four: NuReSys Struvite Management Project

 

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Tags: Biosolids, Dewatering, Mobile Screw Press, Water Reclamation Facility

Schwing Bioset is Excited to Exhibit Virtually at WEFTEC Connect 2020

 

Schwing Bioset Biosolids Handling Solutions

 

Although it will look quite different in 2020, Schwing Bioset, Inc. (SBI) is once again exhibiting at the annual WEFTEC Expo, via our WEFTEC Connect Virtual Showcase, from October 5-9, 2020. Please be sure to stop by our virtual booth while you're exploring the online event to see our available contacts, schedule meetings with our staff, check out product videos, download brochures, and learn about how we help water and wastewater treatment plants. Even though we won’t be able to display our equipment on the floor this year, we can still provide answers to your questions, send you additional information, and connect for a conversation in the future to find the right solution for your plant.

 

Schwing Bioset’s products include, among others, biosolids piston pumps, screw presses, nutrient and struvite removal and management, membrane bioreactors, sliding frame and push floor silos, fluid bed drying products, the Bioset Process for Class A Biosolids, container wagons, live bottoms, and screw conveyors. We also offer on-site demos, mobile rentals, spare parts and equipment maintenance services, and training seminars. You can discover more about our products and solutions here.

 

In 2020, Schwing Bioset, Inc. (SBI) was proud to have acquired substantially all of the assets of Custom Conveyor Corporation (CCC) of Rogers, MN. Custom Conveyor has over 30 years of experience in the manufacturing of conveyance and storage systems with primary products consisting of shafted conveyors, shaftless conveyors, live bottoms, belt conveyors, gates, and Augie dumpster loaders. The acquisition increases SBI’s manufacturing capacity and vertically integrates our supply chain to shorten delivery schedules and enable more competitively priced products in the market. Learn more about Custom Conveyor, A Division of Schwing Bioset, here:

 

The SBI team members available at WEFTEC Connect include Executives, Regional Sales Managers, Service Managers, and more. If you would like to meet with any of these team members, please request a meeting through your WEFTEC Connect portal or email us and we'll put you in touch with the appropriate person to assist with your needs.

 

You can visit the conference website to view the event details, register, download the mobile app, see a list of exhibitors, and more: http://www.weftec.org.

 

We are excited to ‘see’ you at WEFTEC 2020!

 

Schwing Bioset at WEFTEC Connect 2020

 

 

 

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Tags: Announcements, Events, WEFTEC, Expos

Biosolids Plant Up and Running at Paragould WWTP

 

Published in Paragould Daily Press, August 2020

 

Thanks to a newly completed $5.15 million biosolids plant, not all the waste at Paragould Light, Water and Cable’s Wastewater Treatment Plant is actually going to waste. 

“We send out two 12-[cubic] yard trucks of biosolids a day, Monday through Thursday,” said plant Operations Manager David Romine on Monday. 

Romine said the biosolids, a byproduct of wastewater treatment and processed by the plant’s new Schwing Bioset equipment, go out to area farmers at a cost to them of $5 a cubic yard delivered, such that a fully loaded truck would cost $60.

In addition, the new equipment enables a savings of about $100,000 a year on the cost to operate and maintain the equipment, compared to the old system.

The Schwing Bioset system enables sludge produced to receive a rating of Class A EQ biosolid under the EPA 40 CFR 503 regulation. “The EQ means it’s ‘exceptional quality,’” Romine said, “which means you don’t have to do anything special in order to use it anywhere [as fertilizer].”

 

Click here to read the full article in the Pargould Daily Press

 

The Bioset Process allows the product to be used as a fertilizer under regulation for Class A EQ. Pictured is the Bioset unit, dewatering screw presses, piston pump, and truck loading operation. 

20200831_110158 (2)  20191003_134927

 

 

Tags: Class AA/EQ Biosolids, Dewatering, Wastewater Treatment Plant