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A Citizen's Guide to Solvent Extraction

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A Citizen's Guide to Solvent Extraction United States Solid Waste and EPA 542-F-96-003 Environmental Protection Emergency Response April 1996 Agency (5102G) A Citizen’s Guide to Solvent Extraction Technology Innovation Office Technology Fact Sheet What Is solvent extraction? The solvent extraction process involves five steps: Solvent extraction is a treatment technology that uses a • Preparation (sorting the contaminated material) solvent (a fluid that can dissolve another substance) to • Extraction separate or remove hazardous organic contaminants • Separation of concentrated contaminants from solvent from sludges, sediments, or soil. (Sludge is a mud-like • Removal of residual solvent material produced from industrial or sewage waste, and • Contaminant recovery, recycling, or further treatment. sediment is fine-grained rock and mineral fragments which have settled to the bottom of a water body such as a river or lake.) Solvent extraction does not destroy How does it work? contaminants. It concentrates them so they can be more Treatment of contaminated soil is discussed in this easily recycled or destroyed by another technology. guide, but the method would be basically the same for treatment of sludges or sediments. When the soil enters an extractor (a tank where the con- taminated soil is mixed with the solvent), the soil is The entire process is conducted on-site and begins by separated into three components, or “fractions.” The excavating the contaminated soil and moving it to a three fractions are: solvent with dissolved contami- staging area where it is prepared for treatment. The soil nants, solids, and water. Different contaminants con- is then sifted to remove debris and rocks. The soil may centrate into different fractions. For example, polychlo- be processed in either a batch, a semi-batch, or a con- rinated biphenyls (PCBs) concentrate in the contami- tinuous mode. In the semi-batch mode, the material is nated solvent, while metals are left behind in the solids cycled through the extraction unit in increments. If the and water. Each fraction can be individually treated or soil is processed continuously, it may need to be made disposed of more cost effectively. A simplified drawing more fluid so it can move easily through the process by of the solvent extraction process is illustrated in Figure pumping. This is accomplished by adding water or, in 1 on page 2. the case of oily sludges, adding solvents to the material. A Quick Look at Solvent Extraction • Separates contaminants so they may be treated individually. • Is a transportable technology that can be brought to the site. • Reduces the volume of contaminated material. • Processes up to 125 tons of waste per day. • Is designed to operate without air emissions. Printed on Recycled Paper -1 - The soil is placed in the extractor. Extractors can vary • The water, which must be analyzed to determine if in size. Some process 25 tons per day, while others further treatment is necessary before discharge to ei- may treat over 125 tons daily and require setup areas of ther a publicly-owned treatment plant or other ap- 1,500 to 10,000 square feet or more. (For comparison, proved discharge area. a tennis court covers about 4,000 square feet.) The sol- vent is added to the extractor, and the soil and solvent The separation process occurs next. The contaminants are mixed together. Consequently, the organic con- are separated from the solvent either by changing the taminants dissolve into the solvent. pressure and temperature, by using a second solvent to pull the first solvent out of the solvent/contaminant A number of factors control the speed with which con- mixture, or by other physical separation processes. At taminants are dissolved from the soil. Some of these the completion of this step, concentrated contaminants controlling factors include temperature, moisture con- result. Concentrated contaminants are removed during tent, and the level of contamination. Each is critical to the separation process, and the solvent is sent to a hold- the design of the treatment. Treatability studies per- ing tank for reuse. The contaminants are then analyzed formed in a laboratory are required to determine how to determine their suitability for recycle/reuse, or need much solvent is needed and how long the material must for further treatment before disposal. remain in the extractor in order to assure maximum ef- fectiveness. Since some solids may contain contami- Solvent extraction units are designed to operate with- nants that require more than one cycle in the extractor, out giving off contaminated vapors or air emissions. this step of the process may need to be repeated. However, at some sites, air emissions could occur dur- ing excavation or preparation of contaminated soil. If The extraction process produces three fractions which air emissions exceed levels allowed by law, waste require separation: preparation and handling procedures at the site must be • The contaminated solvent mixture. modified. • The treated soil which, depending on the concentra- tions of contaminants present, may require a repeat cycle or further treatment by some other technique. Figure 1 The Solvent Extraction Process Recycled Solvent Concentrated Contaminants Solvent with Extractor Organic Separator Contaminants Contaminated Soil Water (Further Treatment Treat or Disposal) Waste Again If Water Necessary Treatment Treated Solids Oversized Debris - 2 - Why consider solvent extraction? • If the waste contains detergents or strong acids or Solvent extraction can be both an effective and cost ef- bases, solvent extraction may not be effective. Their ficient process for separating hazardous contaminants presence can reduce the amount of contamination from non-hazardous materials and concentrating the removed and slow the speed with which they are hazardous materials for further treatment. Because the removed. contaminants are separated, the treatment selected can • The presence of lead and other inorganics may inter- be targeted to the contaminant. As a result of solvent fere with the removal of organic materials. extraction, some contaminants may be recycled or re- used in manufacturing, thus minimizing disposal re- • Implementation can require complex engineering quirements. The process has been effective in removing considerations. For example, some systems include organic contaminants from paint wastes, synthetic rub- compressed butane and propane, which require strict ber process wastes, coal tar wastes, drilling muds, wood management to prevent them from vaporizing and treating wastes, pesticide/insecticide wastes, and oily igniting. wastes. • Extensive pretreatment of the waste may be required to remove or break up large clumps. What contaminants can it treat? Solvent extraction has been shown to be effective in Where is solvent extraction being used? treating sediments, sludges, and soils containing prima- Table 2 on page 4 lists some Superfund sites at which rily organic contaminants, such as polychlorinated bi- solvent extraction has been selected as a treatment phenyls (PCBs), volatile organic compounds (VOCs), method. In addition to using this technology at Super- halogenated solvents (solvents containing halogens, fund sites, solvent extraction is commonly used by which are bromine, chlorine, or iodine), and petroleum manufacturers in their day-to-day operations. Since sol- wastes. These contaminants typically come from metal vents are expensive raw materials that can be reused, degreasing, printed circuit board cleaning, gasoline, and manufacturers, such as the dry cleaning and perfume wood preserving manufacturing processes. Table 1 lists industries, regularly recycle the solvents used in their the different solvents that are used. This technology is manufacturing processes. generally not used for removing inorganics (i.e., acids, bases, salts, and heavy metals) as these materials do not readily dissolve in most solvents. Other treatment methods exist to treat these contaminants. Will it work at every site? Solvent extraction can be effective at separating hazard- ous organic contaminants from some contaminated soils, sludges, and sediments. It does not reduce the tox- icity of the contaminants and, therefore, the final prod- What Is An Innovative Treatment uct of the process (the concentrated residuals) still re- Technology? quire treatment or disposal. Some of the limitations of this technology include: Treatment technologies are processes applied to hazardous waste or contaminated materials to permanently alter their condition through chemical, biological, or physical means. Treatment technologies are able to destroy or change contaminated materials so they are less hazardous or not hazardous at all. This may be done by Table 1 reducing the amount of contaminated material, by Solvents Used in the Solvent Extraction Process recovering or removing a component that gives the material its hazardous properties, or by immobilizing Liquid Carbon Dioxide the waste. Propane Butane Innovative treatment technologies are those that Triethylamine have been tested, selected, or used for treatment of Acetone hazardous waste or contaminated materials but lack Methanol well-documented cost and performance data under a Hexane variety of operating conditions. Dimethyl Ether -3 - Table 2 Examples of Superfund Sites Using Solvent Extraction * Name of Site Status** Type of Facility Contaminants Carolina Transformer, NC In design Transformer repair Polychlorinated biphenyls (PCBs) United Creosoting, TX In design Wood preserving Polyaromatic hydrocarbons
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