- Hydrotest Water Treatment
High-flow filtration for pipeline and storage tank testing, removing corrosion inhibitors and oxygen scavengers for safe discharge. - Vessel Hydrotest Management
Complete treatment and disposal of contaminated water from reactors, columns, and pressure vessels. - Contaminated Oily Water
Advanced oil-water separators and carbon scrubbers to treat refinery and oil field runoff, reducing TPH and Benzene to non-detect levels. - Groundwater Treatment
Specialized remediation using carbon adsorption and air stripping to remove VOCs and chlorinated solvents from site groundwater. - Industrial Wastewater
Specialized remediation using carbon adsorption and air stripping to remove VOCs and chlorinated solvents from site groundwater.
Advanced Carbon Scrubbing Solutions
Advanced Carbon Scrubbers Meeting BACT and NESHAPS Standards
Envent Corporation designs and operates carbon media systems for industrial facilities, refineries, and petrochemical plants across North America. Our engineering team provides a full line of specialty carbon filtration equipment and turnkey activated carbon removal, replacement, and disposal services.
Our systems are HAZOP and MOC certified, with capacities ranging from 200 lbs to 20k lbs. Built to exceed Benzene NESHAPS regulatory requirements under the Best Available Control Technology (BACT), Envent’s scrubbers provide efficient and cost-effective VOC abatement.
Vapor Phase & Liquid Phase Carbon Media
To maximize removal efficiency, Envent provides a diverse inventory of specialized carbon media tailored to the unique chemistry of your process stream. Our selection process considers contact time, flow rates, and contaminant concentration to prevent premature breakthrough and optimize media life.
Specialized Adsorption Media
- Vapor Phase GAC (Granular Activated Carbon): We utilize premium-grade reactivated, coal-based, or coconut shell carbon specifically for air emission control. These materials offer a high surface area and a diverse pore structure, making them ideal for capturing a broad spectrum of Volatile Organic Compounds (VOCs) and hazardous air pollutants from industrial vent streams.
- Liquid Phase GAC: For water and wastewater treatment, we provide high-grade media designed to remove dissolved organic contaminants, chlorine, and trace hydrocarbons. This media is selected for its high density and abrasion resistance, ensuring it maintains structural integrity during high-flow liquid processing.
- Specialty Impregnated Carbon: When standard carbon isn’t enough, we deploy specialty media chemically impregnated with reagents like Caustic or Potassium Permanganate KMnO4.
Vapor Phase – Vapor Scrubbers & VOC Abatement
Mobile Systems for SCAQMD and EPA Compliance
Envent offers a large fleet of trailer-mounted carbon scrubbers and liquid scrubbers to answer specific vapor phase and odor control needs. Our mobile systems are permitted by regulatory agencies, including the strictest, such as South Coast AQMD, and draw upon our diverse inventory of vapor phase Granular Activated Carbon (GAC) media based on coal or coconut shell. We design our vapor control systems to operate reliably and economically, and our teams are available to handle regular carbon change-outs on your mobile or stationary systems.
Our Vapor Phase applications include:
- Vacuum truck vapor/odor control
Managing emissions during loading and unloading. - High-Volume Trucks
Handling vapor/odor control up to 6,000 cfm. - Industrial Carbon Filters
Specialized for vessel and pipeline purging. - Post-Treatment Cleanup
Polishing for liquid/chemical scrubbing of sour (NH3 & H2S) and acid gasses. - MSS Certified Units
Trailer and skid-mounted units for refinery turnaround compliance. - Vapor Scrubbers
High-capacity units up to 6,000 cfm. - Municipal and Commercial
Carbon scrubbers for community odor issues.
Vapor Phase
Our vapor phase activated carbon removes organic contaminants from hazardous vapor streams and is backed by an industry-leading quality assurance program. With our variety of carbon options-coal-based, coconut shell, or impregnated GAC-we have an enhanced ability to remove volatile organic compounds (VOCs) from gas streams.
To solidify maximum removal efficiency, our media is selected based on the specific molecular weight and concentration of the contaminants in your stream.
Product Data Sheets:
4×8 Coal Based (ECARB 48)
4×10 Coal Based Carbon (ECARB 410)
4×8 Coconut Shell based (ECOC 48)
4×10 Coconut Shell (ECOC 410)
Liquid Phase – Liquid Scrubbers
Meeting Stringent NPDES Discharge Requirements
Envent is highly experienced in using liquid phase carbon scrubbers to remove contaminants from a water stream. We have designed, permitted, and utilized many systems that answer the stringent NPDES discharge requirements for industrial and environmental projects.Typical Liquid Phase carbon scrubber applications include:
Liquid Phase
Our liquid phase carbon removes organic and inorganic contaminants from all types of wastewater, groundwater, and process water. We offer a variety of liquid phase carbon options-coal-based or coconut shell-as well as specialty clays and zeolite for the capture of emulsified oil and grease. Our carbon has been used for industrial, municipal, or commercial applications all over the country.
To attain superior water quality, we select media based on the specific molecular size of the pollutants and the required flow velocity.
Product Data Sheets:
8×30 Coal Based (EWCARB 830)
8×30 Coconut Based (EWCOC830)
12×40 Coal Based (EWCARB1240)
12×40 Coconut Based (EWCOC1240)
Carbon Scrubber Units & Media Services
Largest Fleet for 24/7 Emergency Response
Envent offers a large fleet of trailer-mounted carbon scrubbers and liquid scrubbers to answer specific vapor phase and odor control needs. Our mobile systems are permitted by regulatory agencies-including the strictest, such as South Coast AQMD, and draw upon our diverse inventory of vapor phase Granular Activated Carbon (GAC) media based on coal or coconut shell.
Envent has the largest fleet of odor control units always ready for emergency response 24/7 for pipeline blowdowns, sewers, digesters, storage tanks, vacuum trucks, and high-flow air movers. Our turnkey approach includes on-site media exchange and spent carbon disposal, securing your operational compliance while removing the burden of logistics management.
We design our vapor control systems to operate reliably and economically, and our teams are available to handle regular carbon change-outs on your mobile or stationary systems.
What Our Clients Say
"In my opinion, Envent provides a service that is critical to Chevron maintaining its permit to operate. Envent helps Chevron in controlling vapors safely, reducing costs, and is fully committed to Chevron in a long-term relationship. Envent is the standard for a one-stop shop for engineering solutions and safe execution for vapor control."
Chevron
Supervisor of Product Integrity
"They deliver exceptional performance, over and beyond our expectations contractually."
BP
S&H Superintendent
Featured Case study
The Problem: A producer in the Bakken region needed to transfer crude into 30 frac tanks, generating high flows of VOCs, BTEX, and H2S. To meet NDDEQ and EPA standards, the project required at least 95% control efficiency in a remote area where standard carbon filters saturate too quickly to be cost-effective.
What We Did: Envent deployed the ESCRUB-1000P passive scrubber using proprietary VapoScrubEX5 chemistry. Our OQ-qualified technicians managed the liquid scrubbing system to neutralize hazardous gases and odors at the source, preventing the rapid media saturation typically seen with traditional filtration.
The Result: The system achieved >99% control efficiency, surpassing regulatory mandates. The client saved $21,000 by eliminating three carbon swaps and extending media life by 400%, resulting in 100% compliance with zero safety incidents.
Recent Scrubbers & Odor Control Projects
Explore how Envent’s vapor scrubbing equipment and technicians have successfully managed complex emissions across North America.
Advanced Carbon Scrubbing Solutions: Frequently Asked Questions
What regulatory standards do Envent’s carbon scrubbers meet?
Our systems are designed to exceed Benzene NESHAPS requirements and are recognized as Best Available Control Technology (BACT). We also provide specialized units that comply with the strictest local mandates, such as SCAQMD Rule 1166 in California.
Does Envent provide turnkey carbon services?
Yes. We offer a full-service model that includes system design, equipment rental, media sampling, on-site change-outs, and the responsible disposal or regeneration of spent carbon, allowing your team to focus on core operations.
What is the difference between vapor phase and liquid phase carbon?
Vapor phase carbon is optimized for air emissions (GAC), focusing on the removal of VOCs from gas streams. Liquid phase carbon is engineered to treat water and wastewater, removing dissolved organic and inorganic contaminants to meet NPDES discharge requirements.
Can your scrubbers handle high-flow air movement?
Absolutely. Our fleet includes high-volume mobile scrubbers and blowers capable of handling flow rates up to 6,000 cfm, making them ideal for large-scale tank degassing or high-speed vacuum truck operations.
What types of specialty media do you offer for toxic gases?
For contaminants that standard carbon cannot capture, we provide impregnated media. This includes Caustic-impregnated carbon for H2S removal and Potassium Permanganate (KMnO4) media for neutralizing ammonia and acid gases.
How does Envent handle emergency odor control?
We maintain the largest fleet of “Always Ready” odor control units in North America. Available 24/7, these units can be mobilized within hours for pipeline blowdowns, sewer emergencies, or storage tank venting issues.
Are your systems safe for refinery and petrochemical environments?
Safety is our priority. Our carbon systems are HAZOP and MOC certified, and our field technicians are OQ-qualified (Operator Qualified) to work in high-pressure, high-risk industrial settings.
What equipment sizes are available in your fleet?
Our carbon media systems are highly scalable, with vessel capacities ranging from 200 lbs to 20k lbs. We offer trailer-mounted, skid-mounted, and stationary configurations to fit any facility footprint.
How do you treat water contaminated with oil and grease?
In addition to standard GAC, we utilize specialty media like organoclay and zeolite. these are specifically designed to capture emulsified oils and grease that standard carbon might miss, ensuring your hydrotest or groundwater treatment is effective.
What information do I need to provide for a system quote?
To size the right system, we typically need the flow rate (GPM for liquid or CFM for vapor), the specific contaminants present, their concentrations, and the temperature of the stream. Our engineers will then design a solution tailored to your permit requirements.
Partner with the Carbon Filtration Experts
Don’t risk a permit excursion or project delay. Contact an Envent engineer today to size the right carbon system for your vapor or liquid stream.
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