Zeolite can play an important role in oil field waste cleanup.
An intensive review of Natural Zeolites as Cation Exchangers for Environmental Protection
was done by Colella Pansini of the University of Naples in Italy.
Pansini’s review is made up of four main sections:
Introduction to cation exchange procedures that can be operated at an industrial level, deals with the removal of NH₄+ from municipal and industrial wastewater.
Research on the abilities for natural Zeolites for removal of heavy metals from water and soil shows how chemical and structural features make Zeolites a very powerful tool for the decontamination of soils and waters containing radionuclides.
Zeolite makes an excellent option for oil field cleanup through a combination of ion exchange and sieving capabilities.
1. Ion Exchange
The magnetic charge leftover from the molecular makeup of Ida-Ore Zeolite nets a negative charge on the Zeolite Framework, known as Isomorphous Substitution. These areas of negative charge are therefore an ideal site for adsorption of exchangeable cations in the solution. If there is no suitable site in the structure, or if it is already filled, the cations occupy the sites of water molecules upon ion exchange. This property of Zeolite is part of what softens and filters wastewater that passes the material.
2. Molecular Sieves
Zeolites have the ability to exclude certain cations depending on the size of their microporous channels and cavities within the Zeolite structure. Those cations that are larger than the internal cavities are excluded from all or part of the internal surface of the Zeolite. Whereas, cations that do “fit” into the internal structure can be exchanged (through isomorphous substitution or ion-exchange) into the structure and become part of the Zeolite Framework. Hence, natural Zeolites are renowned for their molecular sieve properties (Tsitsishvili it al., 1992).
The first practical applications of Zeolites were performed in the 19th century (Breck, 1974). The applications for molecular sieve and cation ion exchange applications have been known for hundreds of years.
“Various aspects of work revolving around the Bakken Oil Patch can benefit from the use of Zeolite. The Cation exchange and Molecular Sieve properties allow for cleanup and capture of oil, hydrocarbons, ammonia, methane, radionuclides, radioactive isotopes, and heavy metals; as well as an array of positively charged elements and compounds. Zeolite can play a role in site remediation, landfills, spill cleanup, municipalities, air filtration, wastewater filtration, and radiation capture.”
Cleanup needs around drill sites and accident sites can utilize Zeolite for wastewater treatment. Ida-Ore Mining has the ability to manufacture blends of wood and Zeolite to take advantage of both the lightweight and absorbent characteristics of wood chips. Or it can be used directly to capture radio-nuclides and hydrocarbons.
Wood blends will reduce disposal costs at landfills and still take advantage of the binding and capturing capabilities Zeolite has to offer.
3. Fracturing Wastewater
It is well known the fracturing industry produces billions of gallons of wastewater each year. Several processing plants exist that allow for oil to be separated from water and water to be re-used for additional fracturing or cleaned and entered back into the ecosystem. Zeolite has the ability to properly filter fracturing water of heavy metals, radiation, and hydrocarbons. Possibilities exist for filtration chambers that use Zeolite as part of the process to filter down to acceptable release into streams. Natural Zeolites, in the wastewater treatment of mixed metal contaminated effluents, showed through the conditioning or Clinoptilolite, that 90% of heavy metals could be removed within a 15 minute contact time. The selectivity sequence for Clinoptilolite was shown to be:
Pb > Cu > Cd > Zn > Cr > Co > Ni
Zeolite is similar in Pozzolanic characteristics to Fly Ash, without the inconsistencies and additional harmful compounds, including radioactive isotopes, being added to the equation. Some Fly Ash has even been downgraded to Hazardous Material by the EPA. Zeolite is found in a consistent deposit, meaning product delivered will be of consistent quality over time.
Zeolite has the ability to be pre-mixed into other stabilization products such as wood pellets or mixed over the top of pellets or sawdust, fly ash, kiln dust, recycled cardboard, and any other type of absorption materials.
The conclusion of a study titled: Industrial Sludge Solidification by Using Clinoptilolite Zeolite, done by the Institute of Environmental Sciences in Turkey reinforced the use of Zeolite to consolidate industrial style sludge using Zeolite. The study was based on three parts: preparation of materials to be solidified, unconfined compressive strength values of the solidified material (UCS), and leaching characteristics using a standard Toxicity Characteristic Leaching Procedure (TCLP). The summary stated that hazardous components in industrial sludge was successfully locked and immobilized in the structure formed by the solidification. For the same reasons that Zeolite is commonly used a pozzolan, high UCS values obtained measured 4448 kPa. Leaching test results were compared to limits given by the Hazardous Waste Control Regulation, it was observed that there is not any leaching problem and the solidified products can be land filled safely (Balkan) & Kocasoy, 2004).
The study concluded that solidified sludge samples were safe to dispose of in landfills, although the potential to be used as a beneficial product such as a concrete pozzolan does exist, which would convert waste into a product with benefits and value.
Each mesh size of Zeolite allows for different characteristics to be taken advantage of. Smaller sizes such as 14-40 sand yielded a 60% – 70% sludge addition, but a lower UCS value. Larger Zeolite size of 7-14 or +7 yielded a lower percentage of sludge absorption, but a higher compressive strength.
Tests done on retention ponds routinely find levels of 200 pCi (Donovan). Zeolite will trap those NORMs in place and prevent leachage.
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