In the oil and gas industry, water matters

Water is a resource and a byproduct of all that we do – a critical element in offshore, onshore, upstream and downstream activities. The treatment and management of this water is becoming increasingly complex as you work to keep pace with global standards, energy demand and environmental regulations. Rely on us to be your water solutions partner. Together, we’ll make real what matters most.



We understand the challenges you face.

Our core business is processing and treating water and wastewater for companies like yours. Our oil and gas business includes water treatment technologies, total water treatment solutions and water treatment services. We address your specific needs, from simple products to complex, fully integrated solutions, from beginning to end.

Contact us today for offshore and onshore water injection solutions and produced water treatment for discharge or reuse. We offer seawater treatment including hypochlorite generation, ultrafiltration SCUF systems, deaeration systems, sulfate removal systems and low salinity systems. Additionally, we have decades of produced water treatment experience applying our corrugated plate separators and solid/liquid or liquid/liquid hydrocyclones for primary treatment; dissolved air/gas flotation with our Brise™ pump and Spinsep™, Veirsep™ and Combosep™ systems for secondary treatment; and tertiary treatment using our Monosep™ walnut shell filter and new PerforMedia™ oil removal media.



Our products

Water is a critical element in offshore, onshore, upstream and downstream activities within the oil and gas industry.

Siemens Water Solutions addresses water and wastewater needs of the industry with a portfolio that includes physical and chemical separation, biological treatment, and complex hydrothermal technologies. We bring years of expertise and experience coupled with a technology portfolio and the ability to fully integrate the supply, from simple products to complete solutions, managing customer risk in execution and process performance.

Featured Products
  • Zimpro® Electro-oxidation (ZEO)

    A Lower-Cost Approach for Low-volume Refinery

    Zimpro® Electro-oxidation (ZEO) is a new, commercially available treatment process developed especially to treat the highly problematic spent caustic streams produced by sweetening operations in petroleum refineries.

    White Paper – Zimpro® Electro-oxidation
  • Oil Removal System

    PerforMedia™ Oil Removal Media for advanced oil/water Separation

    For lower total cost of ownership of treatment equipment in oily water applications, PerforMedia reduces oil concentrations from 500 ppm down to ten ppm or less with lower operating expense.

    PerforMedia™ Oil Removal Media

AutoShell™ Walnut Shell Filter

Monosep walnut-shell filter system

Auto-Shell™ walnut shell filters remove oily contaminants from water, and are used in treating oilfield produced water, refinery wastewater, steel mill direct spray and caster water, ethylene plant quench water, copper concentrate decant and cooling water.

The proprietary Auto-Shell filter uses a 66-inch (168 cm) deep bed of 100-percent black walnut shells that have excellent surface characteristics for coalescing and filtration, as well as superior resilience to attrition. These filters eliminate the need for flat media retention screens, and use only one media-scrubbing pump for up to eight filters. This simplifies the design and lowers the cost of multiple filter systems.

Features and Benefits

  • Flat media retention screens are not required

  • Only one media scrubbing pump is needed, simplifying the design and lowering the cost

  • Deep nutshell bed produces superior effluent quality, longer filtration runs and greater throughput efficiency backwashing process that uses raw process water, eliminating the need for air scour, stand-by filters or additional storage tanks

  • Twice the flux rate of conventional filters in the same application

  • Filtration that removes three times the amount of solids before cleaning is required

API Oil/Water Separator

API separator

API oil/water separators by Siemens Water Solutions are the performance, safety and environmental standard for petroleum refineries throughout the world.

We have been manufacturing API oil water separators since the 1930’s, when we worked with the American Petroleum Institute (API) to develop the industry’s standard design. Our API separator design has been risk-assessed, assuring safe operation. Above ground, steel tankage provides double-containment and visual leak detection for hazardous sludges and wastewater, and VOCs are contained through the use of vapor-tight covers. Additional safety features include non-metallic collector components and covers, stainless steel on all wearing metallic components, deflagration vents, flame arrestors, and more.

Sludge collection hoppers, screw conveyors, flushing connections, clean-outs, sludge withdrawal piping, and sludge pumps are designed to remove and transfer API separator bottoms with minimal maintenance and operator attention. This is critical because the inability to remove thick, sticky sludges is the main reason the collector components fail in petroleum applications.

Upgrade for Better Performance and Longer Life
You can improve the performance of your wastewater treatment system and reduce cost with an API upgrade from Siemens. With hundreds of installations in refineries and petrochemical plants, we have the experience to recommend the most economical solution for optimizing your treatment system's performance.

We'll retrofit your existing API separator for better than new performance.

Features and Benefits

  • Reduce energy costs by replacing aging ceramic domes with new diffusers

  • Improve API/DAF performance with new non-metallic chains

  • Increase load-handling capability with a new drive unit


Video: API Animation

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Brise™ Dissolved Gas Flotation (DGF) Pump System

Brise™ Dissolved Gas Flotation (DGF) Pump System

The Brise™ DGF pump by Siemens Water Solutions has proven to be one of the most effective solutions to treating produced waters.

The Brise pump can produce bubbles starting at a size of 1 micron. Currently, there are no other technologies that offer the flexibility and effectiveness of altering bubble size to optimize the efficiency of a flotation unit due to changing water chemistry.

The Brise pump works by using a dual-sided impeller that pulls both water and gas into the pump volute. The backside of the impeller has a “sub-atmospheric” zone that pulls vapor from the blanket gas source or other means and allows mixing with the incoming fluid. As this mixing occurs, the vapor is dissolved into the water creating micro-fine bubbles that break out of solution once a pressure drop is experienced. This pressure drop occurs once the fluids and dissolved gas are flowed across a globe valve prior to entrance into the flotation vessel.

Due to the close tolerance between the back vanes of the impeller and the back plate of the pump, the vapor is sheared into micro-fine bubbles piped into a vessel or tank allowing the fine gas bubbles to attach to the oil droplets. As the gas bubble attaches to the oil droplet, the droplet floats to the surface at an accelerated rate.


Video: DGF Pump Animation

Combosep™ Flotation System

Combosep™ Flotation System

Our proprietary Combosep system is typically comprised of a vertical and horizontal flotation system, mounted on a common skid, complete with interconnect piping.

For extremely large flow rates, the vertical unit (Spinsep™ or Cyclosep™ system) can be packaged on a skid separate from the horizontal Veirsep™ unit. This sophisticated design precludes the need for a gravity separator or skimmer upstream of the flotation system.

The Process
The vertical Spinsep or Cyclosep unit provides the primary separation in the Combosep system. The Cyclosep separator, if used in this application, would include a built-in hydrocyclone to separate the solids and oil from the produced water. The oil is processed within the cyclone to exit the top of the cyclone with the gas vapor. The cleaner water, with the solids, exits the bottom of the cyclone where they are separated and removed from the vessel.

Final polishing in the Combosep system includes a Veirsep flotation system that removes the remaining oil to achieve discharge limits. The unit is comprised of seven separation chambers, has no internal moving parts and can be equipped with either Brise™ DGF pump or eductor technology, to provide gas bubbles that attach and lift the oil to the surface where it is skimmed into the oil compartment.

Design Options

  • ASME Code or non-code vessel construction

  • DGF, eductor or sparge tube flotation design

  • Coalescing pack constructed of Polypropylene or Stainless Steel (Combosep-Plus system)

The Combosep system is designed to replace the traditional use of separators, skimmers and flotation polishing systems. It can replace an entire produced water treatment system with two vessels, a vertical skimmer and horizontal flotation unit. The Combosep system has the ability to replace multiple treatment vessels due to flotation capabilities in both Combosep vessels. The system is offered in multiple configurations:

  • Spinsep-P/Veirsep

  • Cyclosep-P/Veirsep

  • Spinsep-P/Spinsep

Corrugated Plate Separator

Corrugated Plate Separator

Corrugated Plate Separators (CPS’s) provide economical and effective removal of oil and solids from wastewater by gravity, in a smooth, efficient automatic flow. With thousands of installations in operation, this proven design has no moving parts and provides consistent operating results for simple and better separation.

At the heart of the CPS is the Corrugated Plate Interceptor (CPI) plate pack. The plate pack design minimizes the distance a free oil droplet must rise before coming into contact with other oil droplets. This design ensures that the oil droplets coalesce on the undersides of the corrugated plates, facilitating the free oil removal process.

The configuration and number of plates of the CPS units provide enough effective area for free oil removal down to 15 ppm with greater than 60 micron removal. Since the plates are arranged parallel to each other with a 3/4-inch (2 cm) spacing, the separator is able to tolerate up to 100 ppm total suspended solids without affecting the effluent quality.

Typically, these units are one-fifth the size of an in-ground API separator, and produce a finer effluent quality.

Features and Benefits

  • Better effluent quality - removes free oil droplets 60 microns or larger

  • Superior solids handling - tolerates 100 ppm total suspended solids

  • Low maintenance design - no moving parts

  • Quality construction - design meets API standards

EcoRight™ Membrane Bioreactor (MBR) System

EcoRight™ Biological Treatment System

The EcoRight™ biological treatment system is a next generation carbon-assisted biological treatment system incorporating the use of granular activated carbon (GAC) in the aeration tank(s).

GAC is retained in the aeration tanks via screening, isolating the GAC from the membrane filtration section of the biological treatment plant. By retaining the activated carbon in the aeration section, carbon consumption costs are minimized through biological regeneration of the GAC. Effluent quality is significantly improved with the use of activated carbon. In many cases, the EcoRight(TM) system effluent can be fed directly to a water reuse technology such as an RO system or multi-effect evaporator.

Specifically designed to meet the needs of the Oil & Gas Industry, the EcoRight MBR is able to meet increasingly strict effluent requirements and offer economical reuse of water and wastewater through a combination of biological treatment and carbon adsorption.

Features and Benefits

Siemens has a wide range of application experience in the Oil & Gas Industry, in addition to a large installed base of technologies and the ability to offer supporting technologies for an EcoRight™ system plant.

EcoRight MBR systems offer:

  • Reduced footprint requirements compared to conventional biological treatment + GAC

  • Reduced waste disposal

  • Lower CAPEX and OPEX compared to conventional biological treatment + activated carbon filtration

  • Water sustainability/reuse technology

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Folded Flow® Dissolved Air Flotation Separator

Folded Flow® DAF System
Dissolved Air Flotation Separator

The Folded Flow® DAF system’s simple and innovative design “folds” the flow by removing effluent from the same end of the tank as the influent is introduced, resulting in a higher hydraulic loading rate.

In the Folded Flow® design, as the density current travels laterally, clean water, being heavier, peels away from the bottom of the density current and flows downward. At the bottom of the tank, the downward flow gathers in a laminar fashion to form a horizontal return current, which accelerates as it nears the outlet. The downward velocity of liquid from the surface layer to the return stream at the bottom is relatively constant along the length of the tank and is uniformly close to a minimum flow. This ensures that the bubbles are moving upward throughout the entire volume of the tank.

Circular DAF separators can be an economical alternative in many applications, as at this petroleum refinery. Circular units are available as standard package units or as modular build units.

Features and Benefits

  • High Overflow Rate

  • Small Footprint

  • Low Cost

  • Easy to Cover

  • Excellent Oil and Grease Removal

  • Excellent TSS Removal

  • High Float Concentration

  • Easily Handles Settled Solids

  • Tolerant of Large Flow Changes Tolerant of Large Concentration Changes


Video: DAF Animation

Liquid/Liquid and Solid/Liquid Hydrocyclone Separators

Liquid/Liquid and Solid/Liquid Hydrocyclone Separators

The high efficiency liquid/liquid hydrocyclone provides maximum oil/water separation efficiency, and the solid/liquid hydrocyclone is a cyclone clarifier that offers continuous solids removal from liquid. Both can be used in industrial process water, industrial reuse, oil/water separation, and clarification/separation applications.

The liquid/liquid hydrocyclone is one of the most advanced, yet least complicated oil/water separation devices available. It effectively removes free oil and grease in a compact package, at a cost far less than other types of separators. Liquid/liquid hydrocyclones are ideal for oily process water and oil-field produced water applications.

The solid/liquid hydrocyclone offers effective solids removal in a compact package. It can handle high levels of solids, with removal capabilities down to five micron.Solid/liquid hydrocyclones are ideal for treating oily process water and oil-field produced water, desanding of injection water and for sand jetting systems applications.

Features and Benefits

  • Compact design with no moving parts

  • Liners that feature twin inlet ports for superior hydraulic stability

  • A stable oil core that allows for higher removal, reducing or eliminating the need for emulsion breaking chemicals

  • Operation at turndown ratios from 5:1 to 15:1

  • Materials of construction that provide superior erosion and corrosion resistance for longer design life

Hydrocell® Hydraulic Induced Air Flotation Separator

Hydrocell® Hydraulic Induced Air Flotation Separator

Hydrocell™ hydraulic induced air flotation separators remove oil and suspended solids from water in large volumes, and can process solids and oils from 50 ppm to several hundred ppm with product effluents containing less than 5 ppm.

Hydrocell separators use a single pump to drive four proprietary air (gas) eductors, instead of separate motor-driven impellers for each cell. This allows each eductor to saturate the entire volume of each separation cell with fine bubbles, ensuring efficient oil/water separation.

The Hydrocell separator is used to process oil field-produced water, both onshore and offshore, or to process plant wastewater effluents prior to biological treatment or discharge into public waterways.

Features and Benefits

  • Uses less power, is substantially lighter and has fewer moving parts than standard impeller-driven systems

  • Four cells in series allow maximum liquid/air contact

  • Cells are individually adjustable for maximum skimming efficiency and optimum air introduction

  • Optional gas-tight and pressurized designs ensure containment of volatile organic compounds

Monosep™ High-Flow Walnut Shell Filtration System

Monosep™ High-Flow Walnut Shell Filtration System

Siemens Water Solutions offers a complete line of products to remove oily contaminants from water, including the Monosep™ high-flow walnut shell filter which offers improved technology in walnut shell filtration.

The proprietary filter design requires no moving equipment to perform backwashes, and greatly reduces the volume of backwash water produced when compared to other walnut shell filter designs. This simplifies the design of the filters, reduces the weight and footprint, and lowers the cost of multiple filter systems.

Applications
Walnut shell filtration was developed as a more suitable method of filtering free oil and suspended solids in applications where sand filters have traditionally been used. Today, walnut shell filtration is used to treat oil field produced water, refinery wastewater, steel mill direct spray and caster water, ethylene plant quench water, copper concentrate decant and cooling water. In addition, due to the reduction in backwash water volume and reduction in weight and footprint, this re-designed filter is suitable for many off-shore oil production applications.

Principles of Operation
The Monosep™ high-flow walnut shell filter uses a deep bed of 100 percent black walnut shells, which have excellent surface characteristics for coalescing and filtration, plus superior resilience to attrition. The filter’s deep nutshell bed (66 in., 168 cm) offers superior effluent quality, longer filtration runs, and greater throughput efficiency.

The filter uses raw process water and gas or air for backwashing, eliminating the need for moving mechanical equipment or external scouring equipment. The filter operates at twice the flux rate of conventional sand filters in the same application, and can remove over three times the amount of solids before needing to be cleaned.

Filter Operation
During the filtration cycle, dirty process water passes through the filter from top to bottom. As the water passes through the walnut shell media, free oil and suspended solids are removed. After 24 hours of filtration, the dirty process water is redirected and pulsed into the bottom of the vessel to fluidize the media bed. In addition, air or process gas is added in a proprietary manner to create an airlift pump.

The airlift pump lifts the contaminated media to the top of the vessel where the turbulence of the backwash water and gas separates oil and suspended solids from the walnut shells. The use of air or gas greatly reduces the amount of backwash water required. The mixture of air or gas and backwash water is separated in an external vessel. One separator vessel can be used for multiple walnut shell filters. Upon completion of the backwash cycle, the flow of dirty process water is again returned to the top of the vessel.


Video: Walnut Shell Filter Animation

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Spinsep™ Vertical Flotation System

Spinsep™ Vertical Flotation System

The Spinsep vertical flotation system incorporates several unique methods for removing oil from produced and wastewater streams before they are discharged or injected.

Improved technology and a vertical vessel design reduce the footprint required for this innovative flotation system. The Spinsep flotation system can be designed as an ASME code or a non-code vessel.

How it Works
As the influent stream enters the Spinsep system vessel, it flows through a centrifugal coalescing device (Spiralsep™ system) installed in the inlet piping to the vessel. This component initiates gravity separation of the incoming liquid and, if necessary, mixes incoming flotation aids such as chemical water clarifiers.

The circular motion created in the Spinsep vessel by the 90-degree inlet angle results in greater path distance the liquid must travel resulting in improved removal efficiency. The Spiralsep system also stimulates gas bubbles and oil droplet attachment.

Oil droplets grow on the surface of the pack medium until gravity brings them to the surface where they are skimmed into the oil bucket.

Water flowing through the gas flotation zone below the packing scrubs it clean of attached oil. These droplets rise to the surface and are skimmed with incoming free oil.


Video: Spinsep System Animation

PACT® Biological Treatment Systems

PACT® biological treatment system

The PACT system combines biological treatment and carbon adsorption into a single, synergistic treatment step, resulting in significant cost savings and performance advantages over other systems.

The PACT system can be used to treat industrial, refinery, petrochemical, coal gasification wastewater, as well as highly contaminated surface water or groundwater. The single-step treatment process results in significant cost and performance advantages over systems such as activated sludge and granular carbon.

There are many other benefits to using a PACT® system. The powdered activated carbon used in the systems improves the performance of biological systems by stabilizing them against upsets and shock loading. PACT® systems control color and odor, and can reduce costs for residuals disposal and remove soluble organics. With a PACT® system, you will use far less carbon than with a granular system to achieve equal or better treatment. And, you won’t have the problems of prefiltration or column plugging common to granular systems. Further, powdered carbon costs less than granular carbon.

PACT® systems are at work today at installations around the world, helping users comply with:

  • Regulations for organic chemicals, plastics and synthetic fiber (OCPSF) manufacturing discharges

  • Stringent bio-assay standards for effluent discharges

  • Pre-treatment regulations controlling industrial discharges to POTWs

  • Stringent COD and nitrogen standards for direct effluent discharges

PACT® systems include retrofits as well as new construction. They range from factory-built units treating 600 to 100,000 gallons a day, to field-erected units treating up to one MGD, to custom-designed systems handling as much as 50 MGD. Both single-stage and two-stage PACT® systems are available in continuous or batch flow configurations.

PACT® system customers also benefit from more than 30 years of process knowledge, pilot plant testing capabilities and project design expertise of Siemens Water Solutions.

Features and Benefits

  • Improved performance of aerobic and anaerobic biological systems by stabilizing them against upsets and shock loading

  • Color and odor control

  • Reduced costs for disposing of residuals

  • Eliminates problems with prefiltration or column plugging

Wet Air Regeneration (WAR) Systems for Carbon Regeneration
Wet Air Regeneration (WAR) systems are used in municipal and industrial wastewater treatment applications to regenerate spent powdered activated carbon from our PACT® systems.

WAR systems can be field-erected units that are able to handle large volumes, or shop-fabricated, skid-mounted units designed for flows as low as 2 gallons per minute.WAR systems regenerate the spent carbon as a slurry, so there are no expensive, labor-intensive dewatering steps required. Carbon recovery rates of 90 percent or more are common. At the same time, the process oxidizes the organic sludge associated with the spent carbon, reducing the sludge to a small amount of sterile ash. This eliminates the expense and liability of sludge disposal. These systems are ideal for PACT systems where virgin carbon rates exceed approximately 2,000 pounds per day.

Features and Benefits

  • Energy efficient autothermal operation

  • Low operating cost

  • No spent carbon dewatering required

  • No SOx, NOx or particulate emissions

  • No sludge for disposal

  • 90+ percent carbon recovery

  • Small footprint

  • Fully enclosed

  • Applicable to small or large flows

  • Any separated ash is stable, non-leaching

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PerforMedia™ Oil Removal Media

PerforMedia™ Oil Removal Media
Oil Removal System

For lower total cost of ownership of treatment equipment in oily water applications, PerforMedia media can be used in place of both flotation and walnut shell filters, reducing oil concentrations from 500 ppm down to ten ppm or less with lower operating expense.

PerforMedia media is a patented, durable, synthetic media that is able to replace black walnut shells and other types of media in most filtration vessels. Compared to conventional walnut shell media, PerforMedia media is able to load five times more oil, allowing for the elimination of upstream flotation treatment steps. PerforMedia media can handle feed oil and grease concentrations of up to 500 mg/L with oil spikes greater than 1000 mg/L versus 100 mg/L or less for standard walnut shells. It can also handle high feed total suspended solids concentrations, and is a physically larger media that is not as prone to plugging as conventional media

Other benefits of using PerforMedia oil removal media include:

  • Simplified, streamlined treatment train, resulting in lower capital and operational costs

  • Reduction in the amount of chemicals needed to coalesce and remove smaller oil droplets in water

  • Reduction or elimination of backwash frequency due to the elevated holding capacity of the media, resulting in reduced volume of backwash water sent to downstream treatment

  • Lower system pressure drop results in reduced pumping costs

  • Replacement of conventional media, which can be affected by environmental growing conditions

  • Potential for oil recovery from backwash water

  • Lower media attrition rate of one to two percent per year versus traditional attrition rates of two to five percent per year for conventional media, reducing the reoccurring annual expense of replacing lost media and resultant down time to service the vessels

Petro™ Membrane Bioreactor (MBR) System

Petro™ Membrane Bioreactor (MBR) System

The Petro™ MBR system, specially designed for the petroleum, petrochemical and chemical industries, is a wastewater treatment process that combines various biological treatment processes with an integrated, immersed membrane system.

Our Petro™ MBR is ideally suited to a wide range of refinery, petrochemical and production water treatment applications including water reuse, upgrades, retrofits and compliance-driven projects.

And the system is a petroleum-industry upgrade system designed by experts in Rothschild, Wisconsin, who have been working with petroleum and chemical industry wastewaters, and designing equipment to those industry standards for over 30 years.

Features and Benefits

  • Continuously controlled environment around the membrane system equalizes loading on each bundle

  • Positive two-phase transfer into the fiber bundles keeps membrane clean, extending life and reducing operating costs

  • Cross-flow dynamics maximize scouring efficiency

  • Continuous removal of oil and grease from membrane operating environment

  • Automated, in-place membrane cleaning process means reduced labor

  • Safe environment for plant operators

  • Flexibility in biological process selection/optimization

  • Small footprint

Quadricell® Induced Air Flotation Separator

Quadricell® Induced Air Flotation Separator

The Quadricell™ separator has been engineered to provide the most efficient means of removing oil and suspended solids from water in large volumes. These units can process solids and oils in the 50 ppm to several hundred ppm range with product effluents containing less than 5 ppm.

Quadricell separators combine 95-percent efficiency with high throughput for treating highly entrained streams that require intensive aeration for flow rates of up to 5,000 gallons per minute.

The cost-effective Quadricell separator is typically used for the following:

  • processing onshore and offshore oil field-produced water

  • refineries and petrochemical plants

  • vegetable oil

  • tall oil

  • coke processing

  • tanker ballast water

  • paper mill white water

  • emulsions manufacturing

  • pollution control systems applications

Features and Benefits

  • Proprietary design assists in contaminant removal and enhances efficiency

  • As contaminants are floated to the surface froth, they are immediately removed to prevent re-entrainment into the liquid

  • Four cells in series ensure maximum liquid/air contact

  • Cells are individually adjustable for maximum skimming efficiency and optimum air introduction

  • Optional gas-tight design ensures containment of volatile organic compounds

Veirsep™ Horizontal Flotation System

Veirsep™ Horizontal Flotation System

The patented Veirsep horizontal flotation system incorporates several unique technologies to separate oil and various other contaminates from produced water and contaminated wastewater streams.

Featuring a compact footprint, the unit is fully automated and can be designed to operate in an atmospheric or pressurized condition.

The system is comprised of an inlet centrifugal coalescing device (Spiralsep™ system), influent and effluent surge compartments, four flotation chambers, an oil collection weir system, Brise™ DGF pumps for recycling fluid and generating varying micron size air/gas bubbles as well as all required control and operational accessories.

Design Options

  • Pressurized (Veirsep-P system) or atmospheric (Veirsep system)

  • ASME Code or non-code construction

  • DGF, eductor or sparge tube flotation design

  • Coalescing pack constructed of Polypropylene or Stainless Steel (Veirsep-Plus)

  • Customer determines controls, tie in locations and safety controls

  • Veirsep system can be packaged with other Siemens units for final polishing


Video: Veirsep System Animation

Zimpro® Wet Air Oxidation

Zimpro® Wet Air Oxidation Typical Process Flow Diagram
A typical wet air oxidation flow diagram

Zimpro Wet Air Oxidation (WAO) and Wet Oxidation systems are used primarily for treatment of high strength industrial wastewater streams.

Wet air oxidation is the oxidation of soluble or suspended components in water using oxygen as the oxidizing agent. When air is used as the source of oxygen the process is referred to as wet air oxidation (WAO). The oxidation reactions occur at temperatures of 150º C to 320º C (275º F to 608º F) and pressures from 10 to 220 barg (150 to 3200 psig).

The wet oxidation process can pretreat difficult wastewater streams, making them amenable for discharge to a conventional biological treatment plant for polishing. The process is also used for oxidation of contaminants in production liquors for recycle/reuse.

Features and Benefits

  • Pretreatment of high strength wastewater to produce biodegradable residual organics

  • Destruction of specific compounds

  • Elimination of toxicity or reactivity

  • Process liquor treatment for recycle/recovery

  • Gross reduction of Chemical Oxygen Demand (COD)

Applications:
Common wet air oxidation applications include:

  • Treatment of high strength wastewater, including spent caustic streams generated by ethylene crackers and refineries

  • In-process, for treatment and recycle/recovery of process liquor streams

  • Biological sludge conditioning and destruction

Wet oxidation has historically been used for municipal wastewater sludge applications. At lower temperatures and pressures, sludge is conditioned to improve dewatering. This is referred to as Low Pressure Oxidation (LPO). At higher temperatures and pressures, biological sludge can be destroyed, as an alternative to incineration.

Our wet air oxidation capabilities include:

  • Treatability Testing

  • Manufacturing

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Zimpro® Electro-oxidation (ZEO)

A Lower-Cost Approach to Treating Low-volume Refinery Spent Caustic Streams

Zimpro® Electro-oxidation (ZEO) is a new, commercially available treatment process developed especially to treat the highly problematic spent caustic streams produced by sweetening operations in petroleum refineries. The ZEO process is particularly effective on low volume or low concentration spent caustic that may be below the economically feasible threshold for other established treatment technologies.

ZEO uses electricity to generate hydroxyl radicals to perform oxidation in wastewater. The technology has the ability to mineralize recalcitrant organic and inorganic contaminants in toxic and biocidal wastewater streams that are difficult to treat by other means. The technology also eliminates odors and HSE concerns stemming from the presence of sulfides and mercaptans in the streams, as well as removing toxic compounds from effluent destined for an on-site wastewater treatment plant. Because ZEO does not require the purchase, storage and handling of such reactive reagents, it is attractive and effective even on relatively small-scale effluent streams.

The new ZEO process also overcomes the practical limitations of earlier technology by employing a robust synthetic diamond electrode material. This enables the electrodes to handle high current densities while providing a long life in such a difficult waste stream.

Demonstration testing can be performed in Siemens’ Rothschild, Wisconsin, Pilot Plant Facility, with an analytical lab on site to provide quick results.

Contact us about demonstration testing.

Zimpro® Electro-oxidation - Design options

  • Modular system (capacity can be added)

  • Electric / Reactor House

  • Process Skid

  • Off-gas Skid

Zimpro® Electro-oxidation - Advantages

  • Ideal for smaller COD Loads

  • Produces an effluent with no noxious odors

  • Uses electricity to treat wastewater (~75 kW / kg COD)
    - Operates at low pressure and temperatures (<5 bar & <60°C)
    - No pH limitations, but needs dissolved salts for conductivity
    (Salt can be added if dissolved salts are not sufficient)
    - Price and operating expense proportional to kg/h of COD destroyed


References



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