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

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    About WSI
    About WSI

​Innovative Wastewater Treatment Plant Design

WSI International is a provider of innovative Wastewater Treatment systems designed to provide maximum efficiency and reliability for wastewater treatment processes. Made from the finest of stainless steel, our waste treatment plants guarantee a superior quality that exceeds your expectations.

Over 30 years of meeting and exceeding client expectations, WSI has built its name as a reputable company that designs, develop, and manage innovative wastewater treatment systems and equipment. 

We seek to create a positive business relationship with you. We built our service delivery around a team of experts who are committed to ensuring the best treatment systems and A-class customer experience. 
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Wastewater Plant Cost

Wastewater Plant Cost Calculator

Need to estimate the cost of your next wastewater treatment plant? We've launched a FREE simple-to-use calculator to help get budgetary pricing and loading estimates for your treatment facility.

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

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.

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Core Technologies

Biological Treatment Process

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.

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