VSEP Industries

Produced Water Treatment

Produced Water Treatment & Reuse | VSEP® Vibrating Membrane Systems

Transform Produced Water Into a Valuable Resource

Oilfield operators face rising produced‑water volumes, tightening discharge standards, and escalating disposal‑well constraints, especially in water‑stressed regions like Texas. VSEP® (Vibratory Shear Enhanced Process) delivers the breakthrough membrane performance needed to turn challenging, high‑salinity, oily produced water into reinjection‑ready brine, discharge‑quality effluent, or beneficial‑reuse water. Its patented torsional vibration creates intense shear at the membrane surface, dramatically reducing fouling and enabling 5–15× higher flux than conventional crossflow systems, with a compact footprint ideal for onshore and offshore installations.

The Challenge: Rising Volumes, Tightening Constraints

Produced water co‑produced with oil and gas often contains free and emulsified oil, suspended solids, scale‑forming salts (BaSO₄, CaCO₃, SrSO₄), metals, VOCs/BTEX, and NORM (e.g., Ra‑226/228). Salinity can span from brackish to brine (>100,000 mg/L TDS), with wide variability across wells and time.

Regulatory performance targets continue to drive treatment requirements. For U.S. offshore discharges in the Gulf of Mexico, EPA’s NPDES general permit ties “oil and grease” limits to 40 CFR Part 435, historically 29 mg/L monthly average and a 42 mg/L daily maximum; the current GMG290000 permit took effect May 11, 2023. In the North‑East Atlantic, OSPAR’s performance standard for dispersed oil in produced water is 30 mg/L (monthly average), with a risk‑based management framework.

Texas context: Class II disposal wells (SWDs) remain a primary outlet, but seismicity‑related curtailments and stricter reviews are increasingly common in the Permian, shifting volumes and raising operating risk. The Railroad Commission of Texas (RRC) uses seismicity reviews for permit decisions, and has implemented SRA (Seismic Response Area) plans that restrict injection volumes, especially following M≥3.5–4.5 events.

At the same time, Texas is advancing policy and pilots to enable beneficial use of treated produced water, with TCEQ poised to develop discharge/land‑application rules and multiple initiatives exploring reuse to ease drought stress.

Oil well.

VSEP® at a Glance

Vibratory Shear Enhanced Process (VSEP®) is a patented, vertical plate‑and‑frame membrane system that applies torsional vibration to generate intense shear at the membrane surface. The shear field suppresses fouling and concentration polarization, enabling high flux on challenging, oily brines with minimal pretreatment. (micro/ultra/nano/reverse‑osmosis membranes available.)

Why process engineers choose VSEP® for produced water:

  • Low fouling without elaborate pretreatment: Vibration mitigates colloidal, scale, and oil fouling, often eliminating antiscalants.
  • Compact footprint: Up to ~1,400 ft² membrane area per module in ~4’×4′ footprint; vertical design needs up to ~17 ft headroom. (12 ft for offshore)
  • Energy efficient: As low as ~0.27 kWh per 1,000 gal of filtrate (duty dependent).
  • Robust separations: >99% TSS removal, strong de‑oiling, and targeted ion rejection via NF/RO to meet reinjection, reuse, or discharge specs.

How It Works on Produced Water

  1. Bulk Oil & Solids Management (existing or integrated)
    Most facilities keep free oil and grit out of the membrane system—e.g., using gravity separators, hydrocyclones, and induced/compact gas flotation to drop “oil in water” from hundreds of mg/L to <50–20 mg/L.
  2. VSEP® NF (Softening + De‑oiling + Organics Cut)
    VSEP NF removes virtually all free oil, most emulsified oil, and efficiently rejects multivalent ions (Ca²⁺, Mg²⁺, Ba²⁺, Sr²⁺, SO₄²⁻, CO₃²⁻) to mitigate scaling in reinjection. This “softened permeate” is ideal for pressure maintenance/reinjection. NF will often meet ocean discharge requirement for offshore projects.
  3. RO for Beneficial Reuse
    VSEP RO reduces TDS, producing a low‑salinity permeate suitable for strict discharge or non‑potable reuse (e.g., cooling tower makeup, certain irrigation/industrial supplies where permitted). Texas is actively developing the regulatory pathway for such uses.
  4. Polishing (Fit‑for‑Purpose)
    Depending on your target specification, integrate air stripping (VOCs/BTEX), activated carbon, IX/EDI (boron/trace ions), UV/AOP, or H₂S stripping/DO control.
  5. Concentrate Management
    With VSEP, the concentrate (oil‑rich brine) is minimized; final treatment options include coalescing, sludge handling, crystallization/ZLD for further volume reduction, selected against your site’s logistics and disposal economics.

Illustrative Typical Performance & Sizing

  • Feed: Produced water after primary separation (gravity/hydrocyclone/flotation).
  • One industrial VSEP NF module: ~55 gpm feed @ ~250 psi; ~44 gpm permeate; ~11 gpm concentrate at ~5 wt% TS.
  • Permeate quality: ~1 mg/L TSS with low O&G and reduced multivalent ions; selection of NF/RO membranes sets final spec.
  • Flux: 15–150 GFD (temp/chemistry/membrane dependent).
  • Membrane area: Up to ~1,400 ft² per module; compact 4’×4′ footprint; ~17 ft headroom.

For third‑party performance context using VSEP on difficult wastewaters (e.g., FGD, brines), see EPRI and DOE/OSTI reports. [restservice.epri.com], [osti.gov]

Diagram of the cross section of a VSEP filter pack that would be used in Iron Tailings Pond Water Treatment.

Where VSEP Fits vs. Other Produced Water Methods

Disposal Wells (SWDs).

  • Role: Primary outlet in many basins; lowest‑touch path where capacity exists.
  • Challenge: In Texas Permian SRAs, regulators have curtailed volumes and depths to address induced seismicity; applicants face seismicity reviews and enhanced monitoring. These dynamics can increase trucking costs, curtail production, or force mid‑stream reroutes.
  • VSEP angle: Converting a portion of your flow to reused water reduces SWD dependency and buffers operations against curtailments.

Mechanical Separation (Hydrocyclones, IGF/DAF, Nutshell Filters).

  • Role: Effective pre‑treatment for free oil and coarse SS; widely used offshore/onshore.
  • Limit: Limited removal of dissolved constituents and stable emulsions; may not meet stringent discharge or reuse specs alone.
  • VSEP angle: Drops in after bulk oil removal to address emulsions, fines, and ions, opening reuse or RO desalination.

Thermal (MVC/Brine Concentrators/Crystallizers).

  • Role: High‑recovery or ZLD for very high‑TDS brines.
  • Limit: High capex/opex; complex operations.
  • VSEP angle: As a front‑end concentrator/softener, VSEP reduces loading on thermal units to cut lifecycle costs. For economic comparisons in brine/ZLD trains, see AMTA resources. [amtaorg.com]

Biological/Advanced Oxidation/Electrocoagulation.

  • Role: Target specific organics or metals; often sensitive to salinity/variability.
  • VSEP angle: Use selectively for polishing on a fit‑for‑purpose basis. Reviews emphasize the need for combined trains for technical/economic viability.

Texas & Water‑Stressed Regions: From Obligation to Opportunity

Texas leaders (TxPWC, TCEQ) are building the regulatory and technical runway for beneficial reuse of produced water, with pilot projects and forthcoming rules to define “fit‑for‑purpose” end‑uses and discharge criteria. In drought‑prone West Texas, recycled oilfield water is being evaluated for agriculture and industrial supplies—if treated to protective standards.

What this means for operators: With VSEP‑NF/RO, you can turn a liability stream into “new water,” easing freshwater demand for drilling/completions, providing cooling‑tower makeup or other non‑potable uses, and reducing SWD volumes, while aligning with evolving state policy.

Example Flowsheets

  1. A) Reinjection‑Ready (Softened) Water
    Primary separation → VSEP‑NF (divalent removal, de‑oiling) → Buffer tank → Injection.
    Targets:Minimize scaling/plugging risk (Ba/Sr/Ca/SO₄/CO₃), reduce O&G and fines.
  2. B) Beneficial Reuse / Discharge
    Primary separation VSEP‑RO → Polishing (carbon/air stripping/IX as needed) → Storage/Distribution.
    Targets:Low TDS permeate for discharge or non‑potable reuse; polishing selected per VOCs/boron/speciation.
  3. C) High‑TDS Brine Management / ZLD Assist
    Primary separation → VSEP‑NF (soften & cut organics) → Thermal concentrator or crystallizer.
    Targets:Reduce thermal duty and chemical consumption vs. thermal‑only designs. [amtaorg.com]

Compliance Snapshot

  • U.S. Offshore (GOM): Produced‑water “oil & grease” limits implemented through GMG290000 under 40 CFR Part 435; see 2023 permit/fact sheet. [federalregister.gov], [epa.gov]
  • OSPAR (North‑East Atlantic): 30 mg/L dispersed oil monthly average performance standard; risk‑based framework since 2012. [ospar.org], [ospar.org]
  • Texas (onshore): RRC seismicity‑review requirements for SWDs and SRA‑based curtailments are active; TCEQ is expected to propose rules for beneficial use/discharge of produced water. [rrc.texas.gov], [bdlaw.com]

Oil wells.

FAQs

Q: Can VSEP handle high‑TDS brines?
A: Yes. VSEP‑NF excels at softening and organics removal even at very high salinities (<200 g/L); pair with thermal for ZLD options. Reviews and field studies show combined systems are often the most cost‑effective path.

Q: What about BTEX and VOCs?
A: VSEP reduces many dissolved organics; if needed, add air stripping and activated carbon to meet stringent limits.

Q: How does this compare with adding more SWD capacity?
A: In Texas SRAs, SWD permits are increasingly constrained by seismicity reviews; beneficial reuse reduces disposal volume risk while creating “new water” for operations or local industry where permitted.

Q: What oil‑in‑water target can I expect pre‑membrane?
A: Hydrocyclones and gas flotation commonly bring OIW down to tens of mg/L before membranes; the exact figure depends on droplet size distribution and chemistry.

Engineer‑to‑Engineer Resources

Field Proven Results

Case Study – Santa Maria, California

This oilfield was older and oil production was sagging over time. The client decided to implement steam injection to boost production. To do that, they commissioned a VSEP system to treat the produced water to make boiler feed quality water to make steam.

The produced water was fairly saline with TDS of about 29,000 mg/L and high hardness. So, the optimum process included a VSEP nanofiltration (NF) system as a primary stage to remove hardness, oil, multivalent ions, and reduce the TDS. Then, a second stage spiral RO is used to polish the VSEP NF permeate.

A skim tank and a static induced flotation unit was used ahead of the VSEP to recover oil. The VSEP NF produces reject with 8.3% TDS and very high hardness. This was sent to the normal disposal well. The final water after RO polishing sent to a once through steam generator (OTSG) had softened water with 900 mg/L TDS.

Produced water treatment with VSEP flow sheet.

Pilot Testing: Engineering the Right Treatment From Real Data

Why a VSEP® Pilot Is Essential

Produced water varies dramatically by basin, formation, reservoir age, chemistry, and operational conditions. Even within the same field, salinity, organics, oil droplet size distribution, and scaling tendencies can fluctuate significantly over time. A VSEP® pilot establishes site‑specific performance data, ensuring your full‑scale design meets treatment goals for reinjection, discharge, or beneficial reuse.

A pilot is not optional, it is the foundation for accurate membrane selection, flux projection, cleaning protocol development, and mass‑balance modeling for your facility.

What a VSEP® Pilot Determines

1. Flux, Throughput, and System Sizing

A pilot establishes the real‑world permeate flux achievable on your produced water. This determines the number of VSEP modules, pump horsepower, and footprint needed for full‑scale operation.

2. Fouling Behavior & Cleaning Frequency – Pilot testing reveals:

  • The degree of colloidal, organic, or oil‑related fouling
  • How often membranes require CIP cycles
  • Which cleaning chemistries work best on your specific water

3. Pretreatment Requirements (if any)

Because VSEP® can often eliminate the need for elaborate pretreatment, pilots test whether:

  • Existing hydrocyclones, flotation units, or coalescers are sufficient
  • Additional solids or oil pretreatment is necessary
  • Antiscalants or pH adjustment are required—or can be eliminated

4. Salt, Organics, & Contaminant Rejection

Membrane screening during the pilot determines:

  • Divalent ion rejection (Ca²⁺, Ba²⁺, Sr²⁺)
  • TDS reduction potential with NF vs. RO
  • VOC/BTEX behavior and polishing needs
  • Final water quality suitability for reinjection, RO feed, or beneficial reuse

5. Concentrate Management Strategy – Pilot results quantify:

  • Concentrate volume percentage
  • Final solids concentration
  • Oil content of concentrate
  • Feasibility of a second or third VSEP stage
  • Need for thermal, crystallization, or sludge‑handling solutions

6. Temperature Effects & Seasonal Variability

Pilots evaluate membrane performance across your operating temperature range, allowing engineers to:

  • Optimize flux for winter/summer conditions
  • Determine whether heating or cooling is needed
  • Model annual operating cost variability

7. Full‑Scale Economic Modeling

With validated flux and cleaning data, we deliver:

  • Capital cost estimate
  • OPEX projection (power, chemicals, membrane replacement)
  • Concentrate disposal cost modeling
  • Comparative economics vs. SWD disposal or thermal treatment

VSEP oil field pilot test.

California Oilfield VSEP Pilot

Pilot Deliverables

Every VSEP® pilot concludes with a detailed engineering report that includes:

  • Performance curves (flux vs. pressure, flux vs. temperature)
  • Permeate quality & rejection tables
  • CIP procedures & cleaning interval projections
  • Mass‑balance modeling for full-scale design
  • Pretreatment recommendations
  • Detailed economic analysis
  • Recommended membrane type(s)
  • Scaling indices and reinjection compatibility assessment

Pilot Deployment Options

  • Mobile on-site pilot skids (several sizes available)
  • Remote-monitored automated pilots
  • Short-term or long-term seasonal testing
  • NF or RO membrane screening packages

All pilots are supported by New Logic Research process engineers who help tune vibration parameters, cleaning, and permeate targets.

VSEP® Design Considerations

  • Recovery limited by salinity, material rheology, and viscosity
  • Performance is site‑specific
  • Throughput depends on temperature, type of membrane, concentration level
  • Prescreening >100 microns required
  • Chloride concentration may require special materials of construction
  • Low-profile VSEPs are available for offshore platforms

Design note: Actual performance is site‑specific. We pilot test to select membrane type, flux, recovery, and pretreatment options. Chemistry varies for each project. Final system sizing, membrane selection, and performance projections are only provided after pilot testing validation.

VSEP® systems are designed to support NPDES discharge, sewer discharge, and reuse permits, subject to site‑specific regulatory approval.

Request a No‑Cost VSEP® Preliminary Assessment

With decades of experience treating some of the most challenging industrial wastewaters, VSEP® provides proven produced water treatment solutions. If you would like preliminary information to decide whether this makes sense for your project, New Logic can provide a desktop analysis for you at no-cost. This can be done easily before you expend time and effort resources.

Your assessment includes:

  • Contaminant characterization (Oil, TSS, ammonia, metals, TDS)
  • Treatment configuration and implementation roadmap
  • CAPEX and OPEX estimates

If the initial performance projection and cost are in line with expectations, pilot testing can be implemented.

Talk to a VSEP produced water expert today.

+1‑775‑783‑7600
info@vsep.com
Pilot Testing: https://www.vsep.com/technology/pilot-testing/
VSEP® Technology: https://www.vsep.com/technology/

Read the case study: https://www.vsep.com/pdf/ProducedWater.pdf

OTSG case study: https://www.vsep.com/pdf/articles/Produced_Water_to_Steam_Case_Study.pdf

Offshore PW case study: https://www.vsep.com/pdf/articles/Offshore_PW_Case_Study.pdf