PFAS Removal from wastewater

Per- and polyfluoroalkyl substances, or PFAS, is a group of thousands of synthetic chemicals that were used for decades in the manufacturing of many consumer goods like waterproof clothing, non-stick pans, stain resistant fabrics, food packaging, and in industries like paper and cardboard manufacturing, metal plating, wire manufacturing, plastic manufacturing, and many other applications.

PFASS Removal from wastewater

While providing desired characteristics to the many products in which they were used, PFAS chemicals have been tied to various negative health effects. Also of concern is the fact that they are very stable and break down very slowly in nature. PFAS chemicals are found in the environment and in the bloodstreams of people all over the world.

Dynatec has provided systems to remove PFAS from industrial wastewater to customers across the country and has dozens of systems in operation. While there are other technologies in various stages of development, there are two proven technologies for removing PFAS from industrial wastewater: carbon and reverse osmosis (RO). Dynatec has used both granular activated carbon (GAC) and RO for PFAS removal and we can help with the selection of treatment technology for a given application.PFAS Removal - Reverse osmosis

Landfills are a major accumulation location for PFAS as most of the PFAS laden products ultimately end up there. As the leader in landfill leachate treatment, Dynatec Systems has vast experience in treating complex, high strength wastewater and removing PFAS from these wastewater streams. With discharge limits shrinking across the country to single digit parts per trillion (ppt) for some of the most common PFAS compounds like PFOS and PFOA, most of our customers have non-detect levels of nearly all of the tested PFAS chemicals, even where the raw wastewater or leachate has individual PFAS compound concentrations of 3,000 to 5,000ppt or more.

We can design a system to meet any discharge requirement.

Please contact us today to discuss your PFAS removal needs.

SBR to MBR Conversion

SBR to MBR ConversionRefinery Wastewater

Dynatec provided tubular ultrafiltration systems as part of an SBR to MBR conversion. The upgraded treatment system allowed the facility to meet all discharge requirements and increased the capacity of the plant. The SBR could treat 4,000 barrels per day and the upgraded plant utilizing an out-of-basin MBR treats up to 10,000 barrels of wastewater per day.

An oil refinery needed to upgrade their treatment system in order to meet direct discharge limits. The existing SBR could not handle the volume of wastewater and was not consistently meeting the discharge quality limits.

The MBR reduces the COD to below 50ppm and phenols are reduced from over 750ppm to non-detect.

The solution for this plant was an oil water separator followed by out-of-basin membrane bioreactor (MBR).  The permeate from the MBR met all requirements for discharging to sea water. The COD of the permeate was less than 300ppm and the phenols were consistently less than 1ppm.

Dynatec provided containerized systems for easy and fast installation at site.

Significant Savings

  • Simple process
  • Fewer chemicals needed
  • Low maintenance

Technology Benefits

  • Consistent high-quality water
  • Low operating costs
  • Minimal operator intervention required
  • Reduced sludge disposal costs

Contaminants Removed

  • Oil and grease
  • Heavy metals
  • COD
  • BOD
  • Suspended solids
  • Phenols

Flexible Retrofits

The out of basin membranes allow for easy retrofit to any bioreactor configuration (circular, rectangular, above or below ground), since the membranes are installed outside the reactor.  Frequently, the existing infrastructure and building space can be reused with little or no changes.


The membrane system is easy to expand, since the out of basin configuration allows for simple addition of more membranes, or membrane skids.

Better Performance

The MBR System eliminates many of the unit processes associated with conventional treatment systems. The bioreactor tanks degrade constituents normally considered recalcitrant and they eliminate solids carry-over from occurring, allowing long sludge retention times.

Contact Dynatec to discuss your application.


Paint Manufacturer Reuses Latex

A paint manufacturer engaged Dynatec to provide a system to separate latex from wastewater and reuse it in the production of paint

The Problem

The company was using a chemically assisted, rotary drum vacuum pre-coat filter that was expensive to operate and created a lot of sludge which was expensive to dispose.

The Solution

The white paint wastewater was segregated from the colors, andPaint manufacturer uses ultrafilter to remove latex processed separately. The concentrate of white latex solids were used in the manufacture of new white paint.

The paint solids from the colored paints can be concentrated to as high as 20% (typical paint contains between 45% and 55% solids) using wide channel ultrafiltration. The paint solids are concentrated and reused to make a grey paint. The water can be discharged to sewer, since it contains no solids, or it can be reused as wash water.

Special circulation pumps are also used to handle the high solids loadings.

Return on investment

The return on investment was high. The latex from the white paint wastewater is reused in the production process for manufacture of new paint. The paint solids from the colored paint wastewater is recovered as a saleable low quality paint product. The cost for disposal of the solids removed by the old chemical treatment system has been reduced by 90%. The wastewater from both processes is discharged to sewer.


Significant Savings:

 No sludge

 Beneficial use for latex

 Water quality for discharge is better

 Much less operator time

 No chemicals

Ultrafiltration excels at the clarification of solutions containing:

 Suspended solids

 Bacteria

 High concentrations of macromolecules including:

 Oil and water

 Fruit juice

 Milk

 Latex

 Whey

 Electro-coat paints

 Pharmaceuticals

 Poly-vinyl alcohol

 Potable water

 Tertiary wastewater

 Some proteins

 Some dyes

 Oils

 Colloidal or emulsified components

Contact Dynatec Systems today to discuss your wastewater solution!


Automotive Connectors Manufacturer

A leading automotive connectors manufacturer was in need of a wastewater treatment system to address oil and grease and Automotive Connectors Manufacturerheavy metal contaminants in their discharge. Based on understanding of the waste stream and ability to provide a cost effective solution, Dynatec was selected to provide a system that would produce effluent that reliably met the sewer discharge requirements. By using a combination of free oil separation and an Ultrafiltration Membrane system, in addition to removing all of the suspended solids, the Dynatec supplied system consistently provides the following effluent:


Parameters                                             Influent                Effluent
Oil and Grease                                        1,100                  <100
Zinc                                                              2.4                   <1.48
Chromium                                                  3.2                      <1.7

Automotive Solutions Provided

  • Oil and metals removal
  • Membrane Bioreactor (MBR) biological treatment
  • MBR for water reuse of wastewater
  • High purity reuse with MBR and RO

Complete purification and reuse of wastewater system solutions for many automotive firms were provided by Dynatec Systems for:

  • Cooling tower makeup
  • Irrigation
  • Boiler feed
  • Paint line

Contaminants Removed

  • Oil and Grease
  • Metals
  • Suspended Solids
  • Surfactants
  • Biochemical Oxygen Demand (BOD)
  • Chemical Oxygen Demand (COD)
  • Dissolved Solids 

Automotive oily wastewater treatment systems for many facilities in the automotive industry were designed and supplied by Dynatec Systems including the following:

  • Stamping plants
  • Powertrain plants
  • Assembly plants
  • Bearing manufacturer

 Our customers include many large car and truck brands as well as suppliers to those manufacturers.

Ultrafiltration offers the following advantages over conventional separation:

  • No chemical required
  • Very little labor required
  • Simple mechanical process
  • Less sludge
  • Ability to concentrate the retentate for beneficial use
  • Less space required
  • Overall lower operating costs

Tubular Configuration:

  • Higher permeate rate
  • Lower rates of fouling
  • Higher concentration of retentate
  • Easier to clean
  • Longer membrane life
  • Low operating cost

Ultrafiltration is a pressure-driven process that removes the following from wastewater and other solutions:

  • Emulsified oils
  • Metal hydroxides
  • Colloids
  • Emulsions
  • Dispersed material
  • Suspended solids
  • Other large molecular-weight materials

Ultrafiltration systems are also capable of concentrating:

  • Bacteria
  • Some proteins
  • Some dyes
  • Colloidal or emulsified components

For more information, please contact us today.

Dairy Converts System to MBR

A dairy converts an existing biological system to a membrane bioreactor (MBR). The converted plant has the ability to process wastewater at the rate of 475,000 gallons per day.

The conversion provided the ability to increase the treatment rate and at the same time improve the quality of the treated water. The system operated at a higher concentration of mixed liquor in the bioreactor and thereby increase the throughput capacity of the existing bioreactor and improves the quality of the treated water (0.03 micron membrane allows less bacteria and virus to penetrate the membrane surface) that is discharged.

Dairy converts existing biological system to MBR

The Dynatec “out of bioreactor” membrane configuration provided for optimization of both biological and membrane systems. Dynatec’s membrane system decoupled the membrane filtration and biological treatment in a way that allowed for optimization of both the solids liquid separation and the biological system design. The system is capable of operating with MLSS as high as 25,000 mg/L and this has maximized the operator flexibility in plant operations to achieve optimum performance. The positive recirculation through the membrane system minimizes fouling and reduces operator attention.

The amount of space required for the membrane system was small and therefore the system was easily added because of the flexibility in locating the membrane system. The system did not need to be next to or close to the bioreactor. The higher system membrane flux (permeate rate) meant that fewer membranes were required. The simple design required less ancillary equipment and operation at high MLSS meant that no additional tanks were required.

Dynatec’s membrane systems draws on our many years of experience to provide a cost effective, simple system that outperforms other systems, especially with difficult to treat waste streams.Dairy converts existing biological system to MBR

Dynatec’s membrane system was selected in part because the overall capital cost was lower than alternative solutions and because the conversion was principally centered on the addition of the membrane system which was inexpensive to install and the location did not need to be close to the existing bioreactor.

Another reason for the selection of Dynatec by the dairy converts existing system to MBR was because the membrane systems are completely enclosed which minimizes maintenance and provides a safe, clean environment for operators.  The operators were not exposed to fumes and noxious gases.

The system was designed for remote access on any device with a web browser enabling the operator to review system performance and make changes without a site visit.

The unique operation of the membrane system makes it the right solution for difficult to treat wastewater applications such as dairy wastewater. The membrane system operates using tubular membranes in series with a recirculation flow that continuously scours the walls of the membrane surface.  This prevents the buildup of solids on the membrane surface.  The elimination of the solids buildup on the membrane surface results in high flux rates and consistent, dependable operation even in difficult applications where the solids do not filter well.

Contact Dynatec to discuss your wastewater needs.

Poultry Processing Plant MBR

Dynatec Systems’ installed a HiBrid™ UF for MBR service at a poultry processing plant that processes 800,000 gallons per day. The Membrane Bioreactor (MBR) operates at high flux which means less membrane surface area is required and ultimately saving capital cost. Dynatec Systems has installed over 600 membrane systems providing wastewater solutions since 1979. The HiBrid™ MBR UF combines sound engineering and effective process design with state-of-the-art materials of construction.Poultry Processing Plant MBR

Outsource your wastewater service! Dynatec will design-build-own-operate-maintain (DBOOM) your wastewater treatment plant allowing you to concentrate on your core business.

The industrial MBR is the ideal bioreactor configuration for treatment of organic or inorganic contaminants present in industrial wastewaters. MBR’s operate at a higher efficiency while achieving consistent design performance objectives. This makes MBR a more cost effective method of industrial wastewater treatment when performance and tank requirements are considered.

Industrial Membrane Bioreactors Benefits:

  • Higher flux
  • Lower costs
  • Better membranes
  • Improved permeate quality
  • Less operator attention and maintenance

Industrial Membrane Bioreactor (MBR) Applications

Dynatec’s industrial MBR is the ideal biological system for industrial wastewater treatment. It is designed to handle high strength wastewater containing high concentrations of:

  • Biochemical Oxygen Demand (BOD)
  • Chemical Oxygen Demand (COD)
  • Oil & Grease (FOG)
  • Volatiles
  • Metals
  • Ammonia
  • Nitrate
  • Inorganic

The performance is not affected by changes in sludge settleability like the conventional systems, making it the wise choice for industrial wastewater treatment systems that have difficult-to-treat waste streams. Dynatec’s MBRs can effectively handle industrial wastewater streams that would otherwise be toxic or inhibitory to other biological treatment systems.

Backed by decades of experience with MBRs, Dynatec has developed many unique process solutions necessary for industrial wastewater treatment applications such as:

  • Landfill leachate
  • Hazardous landfill leachate with metals removal
  • Automotive manufacturing wastewater
  • Food manufacturing wastewater
  • Titanium processing wastewater

Contact Dynatec Systems today to discuss your wastewater solutions.


Reuse Water with MBR

High-quality discharge and reuse from MBR

Dynatec Provides Reuse Water for Cereals Plant

Dynatec Systems, Inc. has installed a water reuse system in a major cereals plant in Georgia.

The complete treatment system, consisting of a membrane bioreactor (MBR), followed by reverse osmosis (RO), provides a net savings to the plant of more than $3,000 per day in water and sewer charges after deduction of the plant operating costs. The water is reused for cleaning, in scrubbers and in boilers.

Previously, the facility discharged all the wastewater to a municipal treatment plant at a rate of up to 0.5 mgd, and paid both volume and load charges

Quality CriteriaReuse water for Cereal Plant

Since the plant produces a food product, ultimate water quality is vital. The two-stage membrane system (MBR + RO) and final sterilization with ultraviolet (UV) treatment provides the quality assurance that plant management requires. In addition, the membranes used in the MBR system are external to the aeration basin and are tubular. This type of membrane is much less susceptible to failure than the immersed type.

System Design

After a review of the available treatment options, the owners of the facility chose the Dynatec bioreactor option. This process combines aerated biological treatment with an out-of-basin ultrafiltration (UF) system. In combination with reverse osmosis treatment, Dynatec was able to provide the client with the necessary assurances that the water quality would not be compromised, and that the water would be suitable for process purposes, such as boiler feed water.

Dynatec’s design consisted of the following components:

  • Internally fed rotary screen
  • 500,000 gallon above-ground stainless steel equalization tank with jet aeration and duplex PD blowers
  • 500,000 gallon above-ground stainless steel aerated biological reactor with jet aeration and triplex PD blowers
  • Four membrane skids with a common automated CIP (clean-in-place) system, one skid operates in standby mode
  • Reverse Osmosis system
  • Final UV (ultraviolet) sterilization
  • Sludge dewatering decanter centrifuge
  • Completely integrated control system managing all system functionsIndustrial Membrane Bioreactors

System Advantages:

  • The system provides many advantages for the operators and owners.
  • Redundant membrane skids for ease of operation and cleaning.
  • Simple automated cleaning operations with membranes in place.
  • High mixed liquor concentration ensures the lowest possible sludge production, and requires smallest possible footprint.
  • Simple, low maintenance system.
  • Long-lasting tubular membranes with 0.03 μm membrane, ensuring removal of bacteria and viruses.


The system has produced high quality water for reuse. Consistently, the water quality from the MBR has been as follows:

Analytic Units Influent MBR Effluent
BOD5 Mg/L 1200 <5
COD Mg/L   20
TSS Mg/L No data ND

State Award
The facility received an award from the State of Georgia Association of Water Professionals presented an award to the
facility for Outstanding Operation of a facility in the category of Water Conservation.

Project Conclusion:
The project was completed on time and within budget, and has exceeded the estimates that were initially made for cost savings.
The Dynatec system has proved to be reliable and efficient, and has exceeded the customer’s requirements, based on the initial
projected performance.

Technology Benefits

Biological treatment using Membrane Bioreactors provides several benefits:

  • Consistently high-quality water
  • No upsets, since the membrane provides a positive barrier to bacteria and viruses
  • Smaller footprint than conventional systems, due to operation at high levels of mixed liquor
  • Better system kinetics than conventional systems, due to long sludge age
  • Complete removal of bacteria and viruses
  • High quality water for reuse
  • Dynatec Out-of-Basin MBR Systems:
  • Operators never come in contact with biomass
  • Easy clean-in-place without moving membranes

Color Removal with Membranes

Color Removal with Membranes

Membranes selectively remove dissolved species from a variety of sources including:

  • Surface water
  • Rinse water from fabric dyeing
  • Industrial wastewater
  • Color removal with membranesLandfill leachate

Demands for development of membranes with specific performance continue to increase as water quality requirements tighten and water treatment system designs become more complex. Such demands lead to development of new reverse osmosis (RO) and nanofiltration (NF) membranes with higher rejection characteristics for better dissolved salts and boron removal.

New applications have developed which require selective removal of certain dissolved species such as:

  • hardness
  • natural organic matter (NOM)
  • pesticides
  • Organic material which causes color

Engineers desire high removal of specific contaminants in these applications, but at the same time want to maintain some level of salts in the water so it does not become aggressive, which can cause corrosion problems with piping in the distribution network.

Nanofiltration (NF) membranes have good selectivity for removal of naturally occurring organic compounds as well as iron. Organic material can be found in groundwater sources which have surface water intrusion, or groundwater sources which are influenced by decomposing vegetative materials. The contamination of these waters is measured in terms of color units.

Treated water from landfill leachate is another source of color in wastewater. When this wastewater is discharged to a municipal treatment plant (POTW), color and the presence of certain organic acids affect the performance of the final ultraviolet treatment step, causing the receiving facility to require that these components be reduced or eliminated.

Dynatec has developed a number of options for color removal with membranes and organic acid removal. Since each project requires different levels of removal and has different treatment requirements, treatability work is typically carried out to establish the required treatment process steps. Typically, treatment requirements not only include color removal, but may also require the removal of COD, BOD, oil and grease, metals, etc. The treatment steps may include:

  • metals and/or free-floating oil
  • settleable materials removal
  • ultrafiltration for removal of suspended colloidal materials
  • nanofiltration using several options that are available, depending on the requirements of the particular application
  • reverse osmosis for the removal of color, dissolved solids and organics

Finally, some color removal can be accomplished with ion exchange resins specially developed for color removal.

Dynatec will carry out treatability work at their treatment lab or will provide small-scale pilot equipment that is shipped to the project site where longer term studies can be carried out.

Contact us today to discuss your wastewater treatment needs.…reatment-systems/

Containerized Membrane Bioreactor Systems

Dynatec provides completely packaged membrane bioreactor (MBR) systems installed in a shipping container:

  • Easy low-cost installation
  • No building required
  • Easily moved to other locationsContainerized Membrane Bioreactor Systems
  • Quick and easy mobilization

Dynatec has extensive experience in the supply of MBR systems, for sanitary and industrial applications.

Treatment of up to 35,000 gpd of sanitary waste in one container:

 Needs minimal operator attention

  • Uses long‐lasting out‐of‐basin tubular membrane
  • Produces high quality purified water

Dynatec’s containerized MBR system uses  tubular out-of-basin membranes. This concept provides many advantages:

  • The system has the ability to operate at much higher levels of mixed liquor suspended solids (MLSS) than conventional systems and immersed MBRs.
  • High levels of MLSS allow for higher levels of treatment, improved discharge quality, lower Waste Activated Sludge (WAS) volumes as well as increased flows from the same size reactor vessels.containerized membrane bioreactor systems
  • The concept is simple, requiring minimal operator attention.
  • An available option allows for remote monitoring and/or control for even less operator attention.
  • The system can be provided with aerobic digestion alone, or with nitrification/denitrification for total nitrogen removal.
  • The system is provided complete with system feed pumps and screening installed.
  • The membranes used provide up to 5-log levels of bacteria removal, reducing fecal discharge to non-detect levels.
  • The effluent from the system is suitable for many non-potable uses, including irrigation and toilet flushing. The effluent is suitable for further treatment, such as reverse osmosis without the requirement of any pretreatment, since no suspended solids are present, and residual organics are present only at low concentrations.

The MBR has proven to be optimal for treatment of many industrial wastewaters because it is less susceptible to upsets. The MBR’s performance is not affected by changes in sludge settleability like the conventional systems, making MBR a wise choice for industrial systems that have more difficult to treat waste streams. Dynatec has over 44 years experience in dealing with difficult to treat industrial wastewaters using membrane filtration.

Contact Dynatec Systems today to discuss your wastewater needs.

Wastewater reuse

Wastewater reuse is achieved at an automotive plant. Wastewater equipment to treat both sanitary and productionUltrafilter wastewater that included oily waste was designed and installed in a new transmission manufacturing facility.  The goal was to treat and purify water for reuse.

Dynatec met these demands by providing a membrane bioreactor (MBR) followed by a reverse osmosis (RO) system.  The MBR reduced BOD, TSS, and oil and grease to non-detect levels.  The RO is used to polish the MBR effluent so that it is suitable for reuse. It is reused in cleaning operations, cooling tower, and all production applications.

80%-90% of the wastewater is purified for reuse.  Additional industrial park wastewater (after primary clarification at the industrial park) is introduced to the system for treatment and purification.  The system is designed to receive 300,000gpd and purify 250,000gpd for reuse.

This novel approach greatly reduced the total amount of wastewater discharged by this plant.  It provided the water needed for production using a comprehensive system that Dynatec designed, supplied and installed.

Ultrafiltration (UF), Membrane Bioreactor (MBR), Nanofiltration (NF) and Reverse Osmosis (RO) are employed by Dynatec for these wastewater projects. Wastewater recovery and reuse has been successfully implemented with industrial and sanitary wastewater streams for:Reverse Osmosis

  • Cooling tower make up
  • Boiler feed
  • Irrigation
  • Toilet flushingWastewater reuse
  • Direct potable reuse
  • Cleaning/wash applications
  • Rinse processes
  • Painting processes
  • Other plant processes

For more information on wastewater reuse, please contact us today.

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