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Disposorb - Carbon Adsorber Canister
The DISPOSORB canisters have been developed by Calgon Carbon Corporation for rapid deployment and cleanup of low flow treatment applications such as off-spec products, accidental spills, wash water or runoff water treatment or temporary groundwater cleanups. The DISPOSORB canisters contain all of the design features of a full scale adsorber, but are easily transportable and are intended to be disposed of properly after use. The DISPOSORB canisters are available in two sizes; the larger canister containing 1,000 lbs of granular activated carbon to treat flows up to 35 gpm, and the smaller version containing 165 lbs of granular activated carbon to treat up to 10 gpm.
Typical applications for the DISPOSORB canisters would include:
- Small wastewater streams
- Groundwater treatment
- Monitoring well discharges
- Underground storage tank leaks
- Process liquid purification or decolorization
- Spill or runoff water treatment
- Wash water treatment
- Water dechlorination
- Pilot testing for carbon adsorption
Hazardous/Toxic Dissolved Organic Removal
- Process Stream Purification
- In-Plant Spill Treatment
- Laboratory Bench Drains
- Storage Tank Washdown
- Monitoring Well Discharges
- Dechlorination
- Dechlorination of Liquids
- Small Wastewater Streams
Evaluation of Adsorption for Liquid Processes
- Feasibility Studies
- Laboratory Investigation
- Pilot Plant Studies
DISPOSORBB contains granular activated carbon which removes dissolved pollutants from water by a process called adsorption. As water passes through the porous granules of activated carbon, molecules of the organic pollutants are attracted to the surface of the pores and are held there by weak physical forces. The phenomenon is somewhat similar to iron filings being held by a magnet.
The ability of granular activated carbon to remove large quantities of organic impurities is a function of its highly developed internal pore structure. This unique pore structure is created during the manufacturing process which involves the crushing and thermal "activation" of select grades of bituminous coal under carefully controlled conditions. As a result of this processing, an extensive network of pores is created inside each carbon granule providing an enormous internal surface area.
Granular activated carbon`s great porosity is responsible for its high capacity for trapping and holding organic molecules. For example, just one pound of carbon granules has an effective total (external and internal) surface area equal to that of a 100-acre farm.
In general, the adsorption capacity for non-polar organic compounds increases with concentration, molecular weight, and decreased solubility. Compounds which adsorb well are aromatic and unsaturated aliphatic compounds and halogenated solvents.
Low-molecular-weight (less than 50) and/or high-polar compounds, highly soluble in water - such as formaldehyde, alcohols, glycols - will not be readily adsorbed. When the concentration of organic wastes in the effluent equals the concentration in the influent, the DISPOSORB* unit is saturated with the maximum organic loading possible.
The DISPOSORB units can be ordered with any of Calgon Carbon Corporation`s extensive product line of granular activated carbon. A Technical Service Representative can assist is selecting the most cost effective carbon for your application.
The internals of the DISPOSORB^ are a combination of PVC and stainless steel. In applications involving contaminants which attack these materials, alternative internal construction materials can be ordered.
DISPOSORB" units are constructed of polyethylene. They are not suitable for applications where solvents of high-density polyethylene are present in large concentrations or at temperatures above I40°F.
Generally, pre-filtration will be necessary if the stream entering the DISPOSORB- has more than 50 ppm of suspended solids. However, depending upon the nature of the suspended solids, pre-filtration at lower suspended solids levels may be necessary. A flow of 30 gpm will provide 10 minutes contact time per 350 gallon DISPOSORB unit. Flow in the 350 gallon DISPOSORB" unit should not exceed 30 gpm for an individual unit or create an operating pressure of >7.5 psig in single, series or parallel operation.This pressure rating may limit the maximum flow attainable in applications using multiple DISPOSORB`s in series operations. A flow of 10 gpm will provide 5 minutes contact time per 55 gallon DISPOSORB" unit. Flow in the 55 gallon DISPOSORB- unit should not exceed 10 gpm for an individual unit, or create an operating pressure of >7.5 psig in single, series or parallel operation.
Contact time and organic removal efficiency can be enhanced by using multiple DISPOSORB units in parallel or series mode operation. Depending upon the specific application, consideration should be given to using a vacuum-break or anti-siphon loop to ensure the DISPOSORB is flooded, and that a vacuum cannot be applied to it.
Monitoring the influent to the final DISPOSORB in series mode is a good precaution against effluent breakthrough. 350 gallon DISPOSORB-units, 44" diameter by 67" high, may be prepared for operation using hose connections or hard pipe. Connections are male I 1/2" NPT inlet and outlet. Calgon Carbon has available hose harnesses for this purpose as optional equipment. The white connection is the inlet for down-flow operation. The outlet is grey. The DISPOSORB is not recommended for up-flow operation.
55 gallon DISPOSORB units, 23" diameter by 36" high, may be prepared for operation using hose connections or hard pipe. Connections are ¾” NPT inlet and I" NPT outlet.
DISPOSORET units are not designed for operation under high pressure or vacuum. The units have been tested under pressure and should not be operated at a pressure above 7.5 psig.
Granular activated carbon must be thoroughly wetted before use to dispel air and to assure proper contact with the influent stream. To facilitate use in the field Calgon Carbon has performed the wetting procedure prior to shipment Before placing the DISPOSORB unit into service, fill the unit through the effluent line. The DISPOSORB is now ready for use in the normal operating mode.
DISPOSORBB adsorber units may be easily moved by sling or forklift.
Shipping weight for the 350 gallon DISPOSORB units containing granular activated carbon is approximately 2.500 pounds. Spent units can be expected to weigh about 2.500 pounds after water is drained via siphon on the effluent line or I psi air pressure connected to the influent line.
Shipping weight for the 55 gallon DISPOSORB0 units containing granular activated carbon is approximately 350 pounds. Spent units can be expected to weigh approximately 350 pounds after water drain.
Disposal
Depending upon what materials are adsorbed on the carbon, the storage, transportation, and disposal of the spent carbon may be subject to Federal. State, and local regulations as a hazardous material.