Carbonair (A Division of ProAct Services Corporation) offers potable water treatment technologies across the US and Canada

Offering low profile air strippers and potable water liquid phase carbon and media vessels. Carbonair is a leader in rental and purchased potable water equipment.

Carbonair will ensure your potable water needs are met by providing:

  • System designs and engineering
  • Installation supervision
  • System startup and operator training
  • On-going system support and troubleshooting
  • On-site media exchange services

Carbonair’s fleet of potable water equipment includes potable water liquid phase carbon and media vessels, as well as NSF 61 certified STAT low-profile air strippers.

Carbonair’s extensive range of vendors allows access to the best media for your process.

Potable water media include NSF 61 approved virgin coconut carbon, NSF 61 approved virgin bituminous coal carbon, and NSF 61 approved acid washed carbon and ion exchange resin options.

Carbonair has experience in treating PFCs, THMs, and VOCs in potable water, as well as experience in H2S reduction.

Contact a Carbonair/ProAct Potable Water and Airstripping specialist today for more details

Testimonials

Testimonial #1

What was the nature of your project?

The municipality was 7-8 miles from the source area and there were very low levels of contamination, which actually made is the most difficult type of remediation as it makes it difficult to reach your goals.

Why did you select Carbonair/ProAct?

They had the NSF Certification required for the project, along with one other firm and we have had a positive relationship working with Carbonair in the past.

The project was a straightforward large scale low profile airstripper tray system. One of the key criteria in addition to price was availability of construction materials as we were under the gun from a timing perspective and these are not off the shelf items.  Carbonair was able to source the materials on time and on budget.

My confidence level with Carbonair/ProAct is extremely high.  They were very hands-on and responsive as he managed us through the process. During the initial they were on-site and the level of engagement was over the top, very impressive, Bob and his team were on the phone daily checking in whether we asked for it or not.

The performance of the system has delivered exactly as it was modeled during the set-up process.

Bob and his team will be my go-to guys for future projects.  Price will always be the driver, but given that they will be competitive Carbonair/ProAct will get my business.


Municipality

New York
Project Manager

Testimonial #2

What was the nature of your project?

I can’t imagine a situation being any worse that we one we were confronted with, our THM waste flow had extremely high concentrations of four different species significantly exceeding regulations.

We had a pending environmental regulation deadline, so there was no time for lengthy testing.  I brought in three potential partners:  Carbonair/ProAct Services, Hydro Quip/NEEP and QED. 

We chose Carbonair/ProAct – they became the obvious choice and have never let us down.  They met and even exceeded my criteria:

1.  Simplicity
2. Technical competency
3. High level of automation and control

In addition their team was highly dependable, they delivered on every model I asked them to run, their people were very responsive and knowledgeable.  I felt very confident with their designs, recommendations and equipment installation.

The bottom line:  we are down to non-detectable levels of THM.  Carbonair/ProAct delivered the best technology, a very practical designed system and the installation is practically maintenance free.  I would highly recommend them for any similar projects

Major Specialty Chemical Manufacturer
Northeast US/Pennsylvania
Maintenance Project Engineer

Potable Water Liquid Phase Carbon Vessels

Carbonair Services has a large inventory of Potable water liquid phase carbon vessels available for rent. Rental potable water carbon vessels range in size from 1,000 pound to 20,000 pound vessels and can be operated individually, in series, in parallel or parallel/series depending on the flow rate required for the system. Carbonair also has the capability to build new potable vessels for purchase.

Using one of our NSF 61 approved carbons; Carbonair has the capabilities to treat VOCs and PFCs with the use of our potable water liquid phase carbon vessels.

Low Profile Sieve Tray Air Strippers

Carbonair’s STAT series represents the best choice in low profile air strippers, combining high performance, flexibility, and design simplicity. The STAT units are available with a number of tray configurations, blowers, and controls, and can achieve removal efficiency to 99.99% for a long list of volatile compounds.

Carbonair’s STAT low profile air strippers are certified to meet the requirements of NSF/ANSI 61. These STAT units are ideally suited for treatment of drinking water that is contaminated with VOCs including disinfection by-products like Chloroform, Bromoform, Dibromodichloromethane and Bromodichloromethane.

Typical materials of construction in our STAT models include 304 stainless steel and have 125 lb flanged inlet and outlet connections and can be constructed of 316 stainless as well as corrosive resistant Hastelloy 276 material. Below is a list of the various STAT models offered by Carbonair/ProAct.

Model Stat 15 Stat 30 Stat 80 Stat 180 Stat 400 Stat 720
Liquid Flow Range (gpm) 0.5-12 1-35 5-80 10-200 20-400 40-1,000

On-Site Media Exchange Services

Carbonair provides professional turnkey on-site carbon rebed servicing at affordable rates to satisfy our customer’s needs, ranging for potable water vessels.

Our experienced, technical sales reps will assist in mitigating the hassle of completing the required paperwork and assist in meeting regulatory guidelines during activated carbon changeouts or final disposal of spent carbon.

We can provide a vacuum system for smaller vessels or compartmented slurry tractor/trailers for potable water vessels 8,000 pounds or more. Fresh NSF 61 certified GAC material can be transported to the site and installed after the spent carbon is removed via vacuum extraction or slurry method. Carbonair is committed to using the highest quality carbon to ensure maximum performance. Our service is backed by 100% satisfaction guarantee.

PFCs (Perfluorinated Chemicals)

As the concern for PFCs in drinking water rises, and discharge limits fall, Carbonair is a leader in the treatment for PFCs in drinking water.

PFCs had been widely used for manufacturing in a large number of household products and found to contaminate drinking water sources in the United States. PFCs degrade into several byproducts in the environment, however, two main by-products, perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS), are found to be stable and do not biologically break down further. The EPA recently has recommended a new provisional health advisory (PHA) level of 0.07 ppb for a combined level of PFOA and PFOS. With this new PHA level, numerous drinking water treatment facilities are required to treat PFOA and PFOS in their water sources.

Carbonair has researched and tested different granular activated carbons (GAC) to determine the most effective media for the removal of PFOA and PFOS. Using rapid small-scale column tests (RSSCT) and water treatment pilot studies, Carbonair has been able to determine the most efficient and cost-effective carbon. Synthetic resins can also be used in conjunction with GAC to assure the very low PFOA/PFOS level to be met and to reduce the GAC change-out frequency.

THMs

Trihalomethanes (THMs) are by-products formed after disinfection of drinking water sources using chlorination chemicals such as gaseous chlorine (Cl2), chlorine dioxides (ClO2), sodium hypochlorite (NaOCl), and calcium hypochlorite (Ca(OCl)2). These chlorination compounds break down naturally occurring organic matter (NOM) and organic bromide in the water sources to form the following four THMs as disinfection by-products (DBPs): chloroform (CHCl3), dichlorobromomethane (CHCl2Br), chlorodibromomethane (CHClBr2), and bromoform (CHBr3). The compositions of the THMs can vary greatly with a number of parameters such as types and concentrations of NOM and organic bromide, types and dosages of chlorination compounds, times of chlorination, and temperatures.

THMs can be effectively treated using either air stripping or granular activated carbon; however, air stripping appears to be more attractive and cost effective where the off-gas treatment is not required. Shown in the table below is the treatability of THMs by air stripping and carbon adsorption in terms of dimensionless Henry’s law constant (H value) and Freundlich isotherm constant (K value), respectively. The higher the H and K values, the easier the compounds can be treated. Chloroform appears to be the easiest compound to be treated by air stripping but most difficult by carbon adsorption while bromoform appears to be the most difficult compound to be treated by air stripping but easiest by carbon adsorption.

Compound Henry’s Law Constant at 20 °C H Value (Unitless) Freundlich Isotherm Constant K Value (umole/gm)(L/umole)**1/n
Chloroform 0.150 30
Dichlorobromomethane 0.036 30
Chlorodibromomethane 0.095 80
Bromoform 0.017 150

Although EPA has established a maximum contaminant level (MCL) of 80 ppb for the Total THMs (TTHMs), the TTHMs must be in most cases reduced by air stripping to much lower levels in order to account for THM reformation that may occur in the distribution lines downstream. THMs continue to form even after air stripping due to the reactions of DBP precursors and residual chlorine that drinking water treatment facilities want to maintain continuous disinfection and deliver bacteria-free product water to their customers.

Carbonair has conducted a number of water treatment pilot tests to determine the optimum THM removal efficiencies to account for the THM reformation and comply with the EPA’s MCL.

VOCs

Volatile organic compounds (VOCs) have been widely found to contaminate drinking water sources in the United States. VOCs include petroleum hydrocarbons such as BTEX (benzene, toluene, ethylbenzene, xylenes, methyl tert butyl ether (MTBE)) and chlorinated compounds such as trichloroethene (TCE), tetrachloroethene (PCE), dichloroethenes (DCEs), dichloroethanes (DCAs), vinyl chloride (VC). Some of VOCs can be better treated with air stripping while others with carbon adsorption. Shown in the table below is the treatability of some of the commonly found VOCs by air stripping and carbon adsorption in terms of dimensionless Henry’s law constant (H value) and Freundlich isotherm constant (K value), respectively. The higher the H and K values, the easier the compounds can be treated. The H values of < 0.01 and K values of < 10 (umole/gm)(L/umole)**1/n indicate the difficulty in treating with air stripping and carbon adsorption, respectively.

Compound Henry’s Law Constant at 20 °C H Value (Unitless) Freundlich Isotherm Constant K Value (umole/gm)(L/umole)**1/n
Benzene 0.23 100
Toluene 0.20 400
Ethylbenzene 0.29 600
m-Xylene 0.33 800
o-Xylene 0.45 800
p-Xylene 0.29 800
Methyl tert butyl ether (MTBE) 0.035 18
Carbontetrachloride 0.99 200
Chloroethane 0.66 10
Chloroform 0.15 30
Chloromethane 1.80 0.5
1,1-Dichloroethane 0.22 20
1,2-Dichloroethane 0.59 15
1,1-Dichloroethene 1.40 50
1,2-Dichloroethene (cis) 0.16 30
1,2-Dichloroethene (trans) 0.23 30
Methylene chloride 0.055 3
Tetrachloroethene (PCE) 0.59 400
1,1,1-Trichloroethane 0.38 100
1,1,2,-Trichloroethane 0.049 80
Trichloroethene (TCE) 0.38 100
1,2,3-Trichloropropane (TCP) 0.01 200
Vinyl chloride (VC) 3.4 5

It appears from the table shown above that all the listed VOCs are treatable by air stripping, and most of the listed VOCs, excluding chloromethane, methylene chloride, and vinyl chloride, are treatable by carbon adsorption.

Carbonair has extensive experience in treatment of VOCs will identify the most cost effective technologies for each drinking water treatment application.

H2S Reduction

Treatment methods for hydrogen sulfide are air stripping, chemical oxidation, and catalytically enhanced granular activated carbon.

During air stripping, the water pH must be kept below a value of 5.0 in order for all of the sulfide to be present in the strippable for of H2S (hydrogen sulfide). Above a pH of 5.0, H2S will start to dissociate into HS- and H+. The ionized form of HS- will not be removed from the water by air stripping and can convert into H2S after the air stripping due to the chemical equilibrium. The table below shows the percentage of strippable H2S at various pH levels.

pH (S.U.) Percentage of Strippable H2S (%)
3.5 99.97
4.0 99.92
4.5 99.75
5.0 99.21
5.5 97.60
6.0 92.70
6.5 80.00
7.0 50.00
7.5 28.47
8.0 11.18

H2S can be destroyed by oxidizing agents such as ozone, chlorine, chlorine dioxide, potassium permanganate, sodium hypochlorite, and hydrogen peroxide. Sodium hypochlorite and hydrogen peroxide are most commonly used since they are in liquid forms and easy to handle. When ammonia is also present in water, hydrogen peroxide is the best choice because it can oxidize sulfur compounds without reacting with ammonia. Chemical oxidation is not commonly a preferred method of H2S reduction in drinking water, due to the necessity to add in chemicals to the water.

Catalytically enhanced granular activated carbon can be used to treat low H2S concentrations (<5 ppm). In order for the catalytic reactions to take place, it requires a minimum dissolved oxygen-to-H2S concentration ration of 2:1. Under atmospheric pressure, I will be impossible to attain the dissolved oxygen concentration of >10 ppm.