WSI International
WSI International
Wastewater Treatment and Equipment




    For over 30 years WSI has been building and designing wastewater treatment systems and equipment

    US Patents *US8632685B2 *US20140175023A1 *US6251287B1 *US6572817B1

​Innovative Wastewater Treatment Plant Design

WSI International is a leading provider of advanced wastewater treatment systems designed to deliver optimal efficiency, reliability, and performance. Our systems are engineered using stainless steel to ensure superior corrosion resistance and durability.

With over 30 years of experience in the wastewater treatment industry, WSI has earned a reputation for delivering innovative and effective treatment solutions, including packaged wastewater treatment systems, Dissolved Air Flotation (DAF) systems, Moving Bed Biofilm Reactor (MBBR) systems, and Membrane Bio Reactor (MBR) systems. Our expertise in designing, developing, and managing these systems and equipment has enabled us to meet and exceed our client’s expectations.

Our packaged wastewater treatment systems are designed to provide maximum treatment efficiency through advanced technologies, such as biological processes, chemical treatments, and physical separation techniques. Our DAF systems effectively remove suspended solids, oils, and greases from wastewater, while our MBBR systems utilize biofilm technology to provide biological treatment. On the other hand, our MBR systems use membrane filtration to provide high-quality effluent for reuse or discharge. These solutions allow us to offer cost-effective and sustainable solutions customized to meet each client's specific needs.

In addition to delivering high-quality products, we are committed to providing exceptional customer service and support. Our team of experts is dedicated to ensuring the best possible treatment systems and customer experience. We work closely with each client to understand their needs and provide tailored solutions.

At WSI International, we take pride in our technical expertise and our commitment to providing the highest level of service and support to our clients. Whether you are looking for innovative packaged wastewater treatment systems, efficient DAF systems, effective MBBR solutions, or high-quality MBR systems, we are here to help you achieve your goals and improve the efficiency and performance of your wastewater treatment processes.

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Wastewater Plant Cost

Wastewater Plant Cost and Process Calculator

WSI International is committed to helping companies in their wastewater treatment needs. We understand that budgeting for a wastewater treatment plant can be a challenge, which is why we have launched a FREE, easy-to-use cost calculator. This calculator provides budgetary pricing and loading estimates for your treatment facility, allowing you to get a better understanding of the cost of your next wastewater treatment plant. With this tool, you can get an accurate estimate of the cost of your treatment plant without any obligation or commitment. The calculator is simple to use and provides you with an estimate in just a few clicks. The estimate includes all the necessary components of a wastewater treatment plant, such as the treatment process, tankage, pumps, and control systems, so you can get a complete and accurate estimate of the cost of your plant. By using this tool, you can get a better understanding of the cost of your wastewater treatment plant and make informed decisions about your project.

Design-Build WWTP

WSI has the capability to build large scale wastewater treatment plants for major community centers and industrial operations. Our plants have phased designs to accommodate early budgets and meet future demand and local regulations.

Our plants can be custom designed to meet local and regional discharge standards, custom footprints and integrated controls with existing systems. The control systems are easy to operate, can be remotely accessed and can collect long-term data to send anywhere in the world.

Our primary technology is based around MBBR's (Moving Bed Biofilm Reactor).  This technology is easy to maintain and requires little operator oversite. MBBRs have a proven track record and are easy to permit.
Design-Build Wastewater Treatment Plant
Modular Wastewater Treatment Plant

Packaged Wastewater Treatment Plants

Our pre-designed and pre-fabricated packaged plants are perfect when it's not feasible to tie into a traditional centralized wastewater treatment plant. These plants are best used in land development, housing, subdivisions, and small to medium-sized communities.

The plants are custom design using MBBR technology, Anoxic and Anaerobic Processes, DAF (Dissolved Air Flotation), Coagulants, and specialized controls and systems.

Standard designs have been approved by many state and local counties to expedite the permitting process. 
Containerized Watewater Treatment Plant

Containerized Wastewater Treatment Plants

WSI containerized plants are perfect for temporary operations, remote locations and man camps. Our plants use the latest in wastewater technology and controls so a single part-time operator can operate the plant 24/7. These plants can be interconnected to increase capacity.

Containers are easy to ship by truck, helicopter, and ships. Each container can be crushed tested and rated by the American Bureau of Shipping if required.

Every container is designed around our MBBR technology, Micro-DAFs, and custom control systems.

A Proven Wastewater Process

Wastewater Treatment Process
Effortless Permitting and Compliance

We Build Everything In-House!

★ Rapid Fabrication
★ ​Supply Chain Control
★ ​Quality Control and Checkout

What We Are Working On

WSI International designs and builds packaged wastewater treatment plants, Dissolved Air Flotation (DAF) systems, and Membrane Bioreactor (MBR) systems. We have a strong presence in industries such as Oil and Gas, Food and Beverage, and Municipal Water, providing innovative and efficient solutions that meet the specific needs of each industry. We also offer DAF rentals for companies in need of a temporary solution. WSI International is known for delivering cost-effective, high-quality wastewater treatment systems that help reduce environmental impact and lower operating costs. Review our posts and connect with us on LinkedIn for the latest updates on our products and services.

Custom Equipment

We build dissolved air flotation,
belt presses and coagulation systems
all over the world.

WSI engineers understand the demands of every industry and their wastewater treatment needs. Thus, we help come up with efficient equipment suited to the requirements of your industry – whether Oil and Gas, Food and Beverage, Municipal, Mining, Industrial. 

Oil and Gas, Food and Beverage, Municipal, Mining, Industrial


Equipment Client Logos
Dissolved Air Flotation (DAF)

Dissolved Air Flotation Systems (DAF)

WSI has a standard line of DAF systems that are pre-designed and ready for fabrication.

WSI Belt Press

Belt Presses

Our belt presses are the best in the industry due to their heavy-duty tubular design.

Meet Our Knowledge Base

At WSI we believe that all knowledge should be easily accessible by everyone. 

We are publicly posting all of our engineering notes, troubleshooting guides, maintenance manuals, and equipment cut-sheets.  If there is a guide you would like to see, let our engineers know through a support ticket and we will post one within 24 hours.

Our knowledge base contains everything from; pumps, drawings, curves, cut-sheets, control system components, blowers, valves, seals, and much much more!
Wastewater Plant User Guide
Sean Fields - VP at WSI International

​About Us

WSI International has been designing industrial and municipal wastewater treatment plants and wastewater equipment for over 30 years. We are currently maintaining over 80 plants around the world.

Our staff has the expertise to tackle any wastewater project in Oil &Gas, Food & Beverage, Industrial Pre-Treatment, and Municipal.

Connect with us on LinkedIn!

Core Technologies

Biological Treatment Process (MBBR)

Biological Treatment Process

Biological Wastewater Treatment process helps to harness the power of bacteria while using other microorganisms to decompose organic elements and clean water. A proven wastewater treatment process, this process works perfectly for the removal of organic matter and nutrient. 

Depending on the growth pattern of microorganisms, there are two significant approaches to Biological Treatment of Wastewater – The Suspended Growth Process (Activated Sludge) and The Attached Growth Process (Trickling Filter).

To help us determine the right process for proper biological treatment, WSI International checks for the concentration of COD, BOD, TKN and P, SS while considering the Salinity which can adversely affect the efficiency of the process. Once done, we can determine the best approach for optimal result.

To further guarantee efficiency, we use our super-effective BCR (Bio-Chip Reactor) system, which helps us to effectively combine the benefits of both suspended growth process and an attached growth process. 

Unlike the conventional activated sludge and extended aeration system, this BCR system guarantees improved biomass concentration. This means a higher treatment capacity to eliminate sludge bulking concerns while helping to stabilize process operations and reduce sludge production. 

With our process and BCR System, you can be confident of improved contact with organic matter nutrients and elimination of odor and insect problems, no matter the treatment process we use.

Membrane Bio Reactor (MBR)
Membrane Bio Reactors (MBRs) are wastewater treatment systems that combine traditional biological treatment processes with membrane filtration technology. The system consists of a bioreactor where microorganisms break down organic matter in the wastewater, followed by a membrane filtration unit that removes the treated water from the solid waste. The MBR process results in a high-quality effluent that meets stringent discharge regulations and can be reused for various purposes.

The benefits of MBRs over conventional wastewater treatment processes are numerous. MBRs offer a smaller footprint than traditional wastewater treatment systems, making them ideal for areas with limited space. Additionally, MBRs provide a higher level of treatment, resulting in water that is virtually free of contaminants. This makes MBRs an excellent choice for industries such as food and beverage, pharmaceuticals, and semiconductors, where high-quality water is essential.

Another benefit of MBRs is their ability to handle a wide range of influent qualities and flow rates, making them suitable for both small and large-scale applications. MBRs also have low energy consumption and require less maintenance than traditional wastewater treatment processes. Furthermore, MBRs can be adapted to accommodate changes in influent quality, making them a flexible solution for wastewater treatment. Overall, MBRs offer numerous benefits over traditional wastewater treatment processes, making them an attractive option for industries and communities looking to improve their water management practices.
Dissolved Air Flotation (DAF)

Dissolved Air Flotation (DAF)

The DAF unit acts to remove the suspended solids (Biomass) from the BCR reactor effluent. The BCR reactors convert soluble nutrients into cell mass and the DAF removes the cell mass and inorganic suspended solids from the reactor effluent through dissolved air floatation. The DAF pump recirculates DAF effluent and flash mixes it with ambient air (aspirated on the suction side of the DAF pump). The air dissolves into the effluent under the pressure of the pump.

The air-water solution is then passed through a saturation tank to allow additional time for the air to dissolve and to remove any coalesced air bubbles. The solution is then expanded across diaphragm control valves leading into WSI’s proprietary diffusers inside the body of the DAF. By reducing the pressure of the solution rapidly (expanding), the dissolved air is forced out of solution in the form of micro-bubbles (90% of the bubbles formed are less than 10 µm in diameter).

The small bubbles collect under the biomass floc and float it to the surface, forming a thickened sludge blanket on the surface of the DAF that is raked directly into the aerobic digester. The DAF provides greater thickening of the sludge as well as a reduced footprint from a conventional clarifier. Settled sludge is periodically pumped to the aerobic digester via a Seepex progressive cavity pump. 

Why choose WSI International?

  • Safety & Compliance Ensured
  • Start-to-Finish Solutions
  • Superior Service
  • Sustainable
  • Trained Professionals
  • On-Time Delivery
  • All Stainless Steel Designs
  • Reliable Technology

Operational Experience 

WSI is well diversified in several markets, including Oil and Gas, Food and Beverage, Municipal and Mining.


WSI Clients
WSI Financing


  • Application Only up to $500,000
  • Up to $10,000,000 with Financial Package
  • Terms 12-84 Months
  • Technology & Equipment Upgrades
  • 100% Financing
  • All Soft Costs Included (Maintenance, Install, etc.)
  • New & Used Equipment