SCHOOL SAFETY PROCEDURES FOR ART AND INDUSTRIAL ART PROGRAMS CHAPTER 9. WASTE MANAGEMENT Art teachers and students often produce solid waste and sometimes liquid waste as a result of their art processes. Much of this waste can be hazardous, leaving the problem of how to dispose of it safely and legally. Some waste, while non-hazardous, can be bulky and use up space in our overloaded landfills. Certain non-hazardous wastes can be storage or fire hazards. The section on the Environmental Protection Agency in Chapter 5 discusses waste management laws. The most important concept in safe waste management is to know the materials, and the hazards involved. The primary step is defining if the material in question is actually a hazardous waste or not. Understanding materials, including the ingredients, chemical reactivities, physical properties, and hazards involved in using, handling, storing, treating, or transporting is crucial. WASTEWATER The federal Water Pollution Act of 1972, and the Clean Water Act were enacted with the goal to "restore and maintain the chemical, physical and biological integrity of the nation's waters". Regulations promulgated to enforce these laws require that publicly-owned treatment works (POTWs) establish local pretreatment programs to ensure compliance. The actual pretreatment requirements are given in 40 CFR 403. These include general and specific discharge limitations and prohibitions to all POTWs, categorical pretreatment standard programs, requirements for POTW pretreatment programs, and the reporting requirements for industrial users. Under these regulations, it is forbidden to discharge pollutants with certain characteristics into a POTW, including: * pollutants that will cause fire or explosion hazard; * pollutants that will cause corrosive damage to the POTW; * solid or viscous pollutants that can obstruct flow; * pollutants released at flow rates that interfere with the POTW flow; * high temperature discharges that inhibit biological activity; * petroleum oil, cutting oil, or mineral oil products; * pollutants that can generate toxic gases, at levels that may cause health and safety problems; and * trucked or hauled pollutants, not at specific discharge points identified by the POTW. Industrial users must notify their local POTW of alldischarges, that may cause problems with operation and flow. All "significant industrial users" also have to notify the POTW, and their regional EPA office of any discharge of hazardous substances. Significant industrial users are those that discharge at least 25,000 gallons per day of wastewater (excluding sanitary wastewater), or contribute a waste stream that accounts for 5 or more percent of the hydraulic or organic capacity of a publicly owned treatment works (POTWs), or as especially designated by the municipality. Sewer Codes All POTWs are required to develop local sewer use codes. These limits are designed to reflect the particular local environmental conditions of the area. Sewer codes will vary according to where POTW discharges are made. It is impossible to present all the municipal sewage regulations here. Those concerned must contact their municipal Public Works Offices for details on the regulations. Given below is a sample toxic substances list supplied by the New York City Department of Environmental Protection, Bureau of Clean Water, Industrial Wastes Control Section. Sewer codes do restrict certain constituents, and some of the requirements include pH, temperature, Biochemical Oxygen Demand (BOD), Chemical Oxygen Demand (COD), suspended solids, and temperature. Materials that cannot be put into the sewer system include: * construction materials, ashes, cinders, straw, shavings, tar, plastic, wood, punch manure, coffee grounds, fur, wax, or obstructive solids; * flammable or explosive liquids, solids or gases; * petroleum hydrocarbons,at levels greater than 50 mg/L.; * paints and waste from paint manufacturing; * wastewater with a pH < 5.0 or > 9.5; and * toxic substances exceeding permissible concentration (cadmium, hexavalent chromium, copper, cyanide, lead, mercury, nickel, and zinc). TYPES OF HAZARDOUS WASTE What is hazardous waste? There are several categories of chemicals used by students and teachers in schools that come under the heading of hazardous waste. While RCRA designates specific categories of hazardous waste, one can also define hazardous waste colloquially as a material that is of no further use, and cannot be safely returned to the environment, in original form. Types of hazardous waste are listed below. Toxic Wastes This category includes toxic chemicals, such as solvents, formaldehyde, lead compounds, mercury, chromates, etc., which are listed in 40 CFR 261.33. Table 9-1 contains selected chemicals that are listed as toxic wastes. See the EPA regulations for the complete list. -------------------------------------------------------------------------- Table 9-1. Selected Toxic Wastes Regulated by 40 CFR 261.33 Acetone Benzene para-Benzoquinone n-Butyl alcohol Carbon tetrachloride Chloroform Creosote Cyclohexane Cyclohexanone Dibutyl phthalate ortho- and para-Dichlorobenzene Dichloroethylene Diethylhexyl phthalate Diethyl and dimethyl phthalate Di-n-octyl phthalate para-Dioxane 2-Ethoxyethanol (Cellosolve) Ethyl acetate Ethylene dichloride Ethylene glycol monoethyl ether Ethylene glycol monomethyl ether Ethylene oxide Ethyl ether Formaldehyde Freons Hydrofluoric acid Hydrogen sulfide Isobutyl alcohol Mercury Methyl alcohol Methyl bromide Methylene dichloride Methyl chloroform Methyl ethyl ketone Methyl ethyl ketone peroxide Methyl isobutyl ketone Methyl methacrylate Naphthalene Pentachlorophenol Perchloroethylene Phenol Resorcinol Selenious acid Selenium dioxide Tetrahydrofuran Thiourea Toluene Toluene diisocyanate (TDI) 1,1,1-Trichloroethane Trichloroethylene Xylene --------------------------------------------------------------------- Acutely Hazardous Waste This is hazardous waste that is very dangerous even in small amounts. One has to follow EPA regulations if one generates more than 1 kilogram (2.2 pounds) of these materials in a month. Table 9-2 contains selected acutely hazardous wastes listed in 40 CFR 161.33 which may be generated in schools. See the EPA regulations for the complete list. ---------------------------------------------------------------------- Table 9-2. Selected Acutely Hazardous Wastes Regulated by 40 CFR 261.33 Arsenic oxides Beryllium Carbon disulfide Cyanides Hydrogen cyanide Nitrogen oxides Phenylmercuric acetate Phosphine Strontium sulfide Vanadium pentoxide ----------------------------------------------------------------------- Flammable Waste This category includes: * flammable and combustible liquids (flash point less than 142ø F or 61ø C); * solids capable of causing fire through friction, moisture absorption, or spontaneous combustion (e.g. turpentine, d-limonene, and oil-soaked rags); * ignitable, compressed gases (e.g. acetylene); and * oxidizing substances (e.g. potassium chlorate, concentrated nitric acid, dichromates, etc.). Corrosive Waste Wastes with a pH less than 2 or greater than 12 are considered corrosive. Examples include nitric acid etching baths, photographic developing baths, anodizing and electroplating baths, ammonia, and acid dyebaths. Reactive Waste Reactive waste includes: * normally unstable compounds that can undergo violent change without detonating (e.g. methyl ethyl ketone peroxide and benzoyl peroxide); * cyanide or sulfide wastes which can generate dangerous amounts of toxic gases at pHs between 2 and 12.5 (e.g. cyanide electroplating solutions); * compounds that react violently with water; * compounds that can form potentially explosive mixtures with water; and * compounds that can detonate at room temperature and pressure. Leachable Toxic Waste EPA has defined a Toxicity Characteristic Leaching Procedure (TCLP) to determine if a hazardous waste could leach toxic amounts of certain metals, pesticides and organic chemicals into the ground water. This test is specified in Appendix 2 of 40 CFR 261. Table 9-3 lists selected chemicals restricted under this regulation. See the EPA regulations for the complete list. ------------------------------------------------------------------------ Table 9-3. Selected Chemicals Regulated Under the TCLP Rule (40 CFR 261.24) Arsenic Benzene Barium Cadmium Carbon tetrachloride Chloroform Chromium ortho-dichlorobenzene para-dichlorobenzene 1,2-dichloroethylene Lead Mercury Methyl ethyl ketone Pentachlorophenol Perchloroethylene Selenium Silver Trichloroethylene --------------------------------------------------------------------------- Other Hazardous Waste Other classes of hazardous waste, not normally encountered by artists, include radioactive materials and pathological waste. WASTE MANAGEMENT METHODS There are many waste management methods available. Obviously some are better than others. The following list the common ones in order of priority: 1. Waste elimination or reduction at the source 2. Waste separation and concentration 3. Waste exchange 4. Energy and material recovery 5. Incineration or treatment 6. Secure land disposal Sometimes, a combination of these methods will be needed. While the two most commonly used options of hazardous chemical waste management are secure chemical landfill storage and incineration, they may not be the most preferable. Waste Elimination or Reduction The best way of managing hazardous waste is to actually eliminate or minimize its production. The first step is to understand the hazards of the materials used. Then the substitution of lesser toxic materials can be investigated. Waste minimization pays particular attention to reducing the environmental toxicity - which is often reflected in the health hazards of the materials. Using lead-free glazes instead of leaded glazes results in the reduction in the amount of lead that enters the environment, via kiln fumes (health and air hazard), and also in discarding unwanted or waste material (as hazardous waste). Also, lead-glazed pottery is often not safe with food, and lead glazes cannot be donated to many art programs because of the hazards involved. Another example of waste minimization is the use of water-based screen printing inks instead of solvent-based ones. Waste Separation and Concentration If one cannot reduce the actual amount of hazardous waste being produced, the next step is to keep hazardous waste from "contaminating" regular garbage. In this way, these different waste streams remain separated. An example of this is separating used and unwanted solvent-based paint from water-based paint. Sometimes wastes can in fact be combined in an advantageous manner. For example, mixing dilute solutions of spent photographic developer (basic pH) with dilute solutions of spent photographic stop baths (acidic pH) can result in neutralization of both to nonhazardous waste solutions. Small amounts of solvents or solvent-containing materials (less than a pint) can be evaporated if no other better alternative is available. Of course, this evaporation should take place outside, or inside a local exhaust hood where no one will be exposed to the solvent vapors. Waste Exchange and Recycling One of the most exciting methods of waste management is exchange and recycling of products. There are two types of recycling methods, which can be described as internal or external approaches. Internal recycling: This method involves individual reuse of material. Oil-painting solvents used during painting can be allowed to settle, and then strained through cheesecloth (to remove the solids), and finally, reused either in actual painting or during cleanup. Internal recycling is usually going to be beneficial in terms of cost. We encourage artists and colleges to look at their extra materials and unwanted materials for possible reuse and recycling at another time. The inventory of materials can help in this evaluation. External recycling: This method involves actually passing unwanted materials on to someone else who can use them. What is refuse to one may be usable to another. For example, leftover art materials can be donated to an art center. Note that hazardous materials should never be donated to elementary schools, and highly toxic materials like lead glazes should not be recycled. There are increasing numbers of actual waste exchange programs. For example, the Northeast Industrial Waste Exchange, Inc. (NIWE) is one non-profit information clearinghouse for the resale of waste. They put out a quarterly catalog on both wanted and available resources. ENERGY AND MATERIAL RECOVERY Sometimes a waste cannot be put to good use in the form that it is generated, and must be treated to access beneficial qualities. Reclamation involves pick-up and handling of hazardous wastes by licensed companies. Large printmaking departments, which generate many solvent- or oil-soaked rags can contract pick-up, laundry and return of their rags for re-use. Incineration or Treatment It is sometimes impossible to reuse a material, and in this case it must be either destroyed by a process such as incineration, or treated in some manner to convert it into a less toxic material can be reused in the environment. There are three types of treatment options that are available: 1. Volume reduction refers to water removal, or concentration of chemicals that really doesn't result in a more acceptable waste, but a form of waste that is easier and safer to handle. While concentration of wastes conserves space, it rarely results in a more environmentally acceptable waste. Instead, concentration normally is practiced to conserve space in a chemical landfill. 2. Detoxification can involve several processes. Neutralization of acids and bases is a traditional example. Spraying materials removes volatile toxins from aqueous waste. Sometimes, toxic metals can be converted to highly insoluble and thus less biologically accessible compounds; for instance, highly toxic and soluble barium salts can be converted to the less toxic sulfates. Certain biodegradable wastes can be treated in surface impoundments. 3. Solidification involves converting waste into a solid form, usually by incorporation into a matrix. The purpose of solidification is to trap the waste in order to control the rate at which ground or surface water that contacts the waste can dissolve the hazardous components. This might be a solution for waste ceramic glazes that cannot be recycled. Secure Land Disposal The least favorable option, placed at the bottom of the waste management hierarchy is secure land disposal. There are two techniques of secure land disposal. The first is similar to the operation of a sanitary landfill facility, where waste is placed in contact with soil or buried under soil, to encourage biological degradation. A very high degree of ground and surface water isolation is required. Another approach to secure land disposal is perpetual storage. Secure land disposal and perpetual storage is placed last in the hierarchy of management options because of the many uncertainties regarding long-term success and safety, and maintenance complexities. Landfill design, transportation safeguards, labeling, surveillance, leachate management, disease control, barrier development and land use are just some of the safety concerns. WASTE DISPOSAL SERVICES Hazardous materials that can't be properly disposed of in other ways should be taken, in compliance with EPA and DOT requirements, to a licensed hazardous waste disposal company or picked up by a licensed hazardous waste transporter. Often this can be expensive. Once a contract is open with a waste management firm, the contractor will often help the client meet transportation and recordkeeping requirements. Specific contractors may have additional container labeling or marking requirements, or require specific waste analyses, or special packaging beyond that which is specified by the regulations. When wastes are shipped off-site, they are usually consolidated or lab packed. Lab Packs Many companies, because of the high costs of insuring the transportation vehicles, have set up special services, such as lab packs, that are very helpful in areas where there may be a great variety of chemicals, but the quantities that actually accumulate may be small. Smaller containers of similar and compatible materials can be placed in larger DOT-approved containers (e.g. a steel or fiber drum), provided that there are enough cushioning and absorbent material (e.g. vermiculite) surrounding each container. A chemical inventory is made as the containers are added to the drum. When the drum is full, it is sealed and shipped to the disposal facility, for processing, along with a copy of the inventory sheet. This system is called a lab pack, and is particularly useful when actual quantities of hazardous wastes generated are small. Lab packs are often put together at the time of shipment of hazardous waste. A lab pack must contain compatible wastes, even though the individual identities may vary. Disadvantages of lab packing include the fact that actual disposal is expensive since adsorbents make up the majority of the material disposed. When the inner containers are not full, actual space in the drum is wasted. Advantages include the fact that lab packs are generally safe, and simple, in that there is little chance of personnel exposure from transferring wastes or of hazardous mixing of incompatible chemicals. Consolidation of Wastes The alternative to lab packing is the consolidation of compatible waste materials into bulk form. Consolidation of wastes, however, presents different advantages and disadvantages. Utilization of space in consolidation is very efficient since chemicals are removed from their original containers and combined. About 3 or 4 times the amount of chemicals can be placed in a consolidated drum as compared to a lab pack. The total costs for disposal are lower, but there is a much greater risk of a chemical reaction or spill. Sometimes a facility may not accept a lab pack or consolidated waste drum if certain wastes included are not allowed under their permits. For example, the inclusion of wastes containing mercury in a container of other wastes could prevent incineration of the entire waste stream in the container, thus making it impossible to dispose of the waste. Also, the improper mixing of solvents, might prevent certain reclamation, reuse, or land disposal of the material. Transportation of Hazardous Waste Shipments of hazardous wastes off-site are regulated by both the EPA and Department of Transportation (DOT). DOT requires that wastes be segregated by hazard class. EPA requires that off-site shipments of hazardous waste must be accompanied by a "Uniform Hazardous Waste Manifest", which is a shipping paper used to track the waste. The manifest documents the "cradle-to-grave" requirements, and contains the name and address of the generator, the receiving facility site, and all transporters, along with a listing of all hazardous wastes in the shipments. All personnel handling the wastes must sign the manifest. Large quantity generators must have certification regarding waste minimization including programs to reduce the volume, quantity and the toxicity of the wastes. Similarly, small quantity generators must sign such a statement. All containers used for transporting the wastes over public streets and highways must meet DOT requirements for construction, compatibility with contained material, and tightness. RECOMMENDATIONS FOR TREATMENT OR DISPOSAL These recommendations are for actual treatment or disposal of art materials. If possible, leftover or waste art materials should be recycled or handled by other methods as listed above, especially since recycling of hazardous waste materials exempts waste generators from EPA regulations. Whenever pouring or neutralizing chemicals, wear proper, approved personal protective equipment including: * chemical splash goggles approved by the American National Standards Institute (ANSI); * protective clothing (impermeable gloves, aprons, etc.); * exhaust ventilation for hazardous, volatile gases or solvent vapors; and/or * appropriate respirators approved by the National Institute for Occupational Safety and Health (NIOSH). In addition, allroutine chemical handling should be done in areas that are equipped with: * emergency spill control kits for large spills; * fire extinguishers for flammable and combustible materials; * eyewash fountains in case of splashes in the eyes; and * emergency showers for concentrated acids and alkalis. Acids Examples: acetic acid, boric acid, hydrochloric acid, hydrofluoric acid, oxalic acid, nitric acid, phosphoric acid, sulfuric acid, para-toluenesulfonic acid. Dilute Acids 1. Neutralize dilute acid solutions by slowly adding baking soda (sodium bicarbonate) until bubbling stops. Check the pH with pH paper (neutral being pH 7). 2. Pour neutralized acid down the sink with lots of water. 3. Wear appropriate personal protective equipment. 4. Hydrofluoric and chromic acid solutions should never be poured down the sink. Dispose of as hazardous waste. Concentrated Acid Solutions 1. Less than a cup of concentrated acids can be diluted by slowly pouring into 10 parts of water to one of acid, and then neutralized as above. Always add the acid to the water to avoid production of large amounts of heat and boiling. 2. Wear appropriate personal protective equipment. 3. Larger amounts of concentrated acids should be disposed of as hazardous waste. Solid Acids Solids such as oxalic acid should be disposed of as hazardous waste. Aerosol Spray Cans Examples: spray adhesives, spray fixatives, spray paints 1. Empty aerosol spray cans completely by spraying (outside or in a spray booth), and then placing in the garbage. Spray cans with residues are fire and explosive hazards. Alkalis Examples: ammonium hydroxide, calcium hydroxide (slaked lime), calcium oxide (lime), lithium oxide, potassium hydroxide (caustic potash), potassium carbonate (potash), potassium oxide, sodium carbonate (soda ash, washing soda), sodium hydroxide (caustic soda), sodium oxide, sodium silicate, trisodium phosphate. Dilute Alkaline Solutions 1. Neutralize by slowly adding citric acid or white vinegar using pH paper to indicate when neutral (pH 7). 2. Pour the neutralized alkali down the drain with lots of water. 3. Wear appropriate personal protective equipment. Concentrated Alkaline Solutions 1. Small amounts (less than a cup) can be diluted by slowly pouring into 10 parts of water to one of alkali, and then neutralizing as above. Always add the alkali to the water. 2. Wear appropriate personal protective equipment. 3. Larger amounts of concentrated alkaline solutions should be disposed of as hazardous waste. Solid Alkalis 1. Dispose of as hazardous waste. Chlorine Bleach 1. Chlorine bleaches (sodium hypochlorite) are alkaline, and can produce chlorine gas when mixed with acid, or other poison gases if mixed with ammonia. 2. Less than a cup of household strength chlorine bleach can be poured down the drain with lots of water. 3. More than a pint of household bleach and stronger bleach solutions should be disposed of as hazardous waste. Clay 1. Place in garbage in sealed plastic bags. Clay is not listed as a hazardous waste by RCRA. Dyes Powders 1. Place in garbage in sealed plastic bags. Most dyes are biodegradable and are not listed as hazardous waste. Dye Solutions 1. Pour dye solutions down the drain with lots of water. 2. If the dyebath is acidic or alkaline, neutralize as discussed under Acids and Alkalis. 3. Mordant baths containing dichromates must not be poured down the drain since they are oxidizing agents and probable carcinogens. They should be disposed of as hazardous waste. Evaporation can reduce the volume of hazardous waste. Enamels - See Glazes and Glaze Chemicals Etches and Pickling Solutions 1. These are acidic and should be neutralized. See Acids. 2. Acid etching on zinc and copper dissolve zinc and copper, which are regulated under local sewer codes. These codes do not normally apply to small waste generators. If desired, zinc and copper can be precipitated by adjusting to pH 8, by the addition of sodium carbonate (washing soda) and filtering the solution. The precipitate can be placed in the garbage and the solution poured down the drain with lots of water. 3. Wear appropriate personal protective equipment. Glazes and Glaze Chemicals 1. Glaze chemicals, glazes, and glazed pottery are considered hazardous waste if they can not pass the acid leaching tests specified by EPA for arsenic, barium, cadmium, chromium, lead, nickel, or selenium. 2. Other glaze chemicals, glazes and glazed pottery can be placed in the garbage. Glazes should be allowed to dry before disposal. 3. Recycle glazes when possible. Residual glazes and glaze scrapings from spray booths can be combined, homogenized, tested, and used as a glaze. If needed, they can be adjusted with fluxes, colorants, etc. 4. Do not pour any glazes down the sink. Glues and Cements 1. Allow water-based glues and cements to dry, and place in garbage. 2. Small amounts of solvent-based glues and cements (e.g. less than a cup) should be allowed to dry in a laboratory hood, spray booth, or outside in a location which will not expose anyone to solvent vapors. Keep away from sparks, flames, or other sources of ignition since most solvent-based glues are flammable. 3. See Plastics Resins for epoxy glues and methyl methacrylate glues. Metals 1. Scrap metals are not considered hazardous waste if they are recycled or reclaimed. 2. If they are not recycled, then scrap metals would be considered hazardous waste if they can not pass the acid leaching tests specified by EPA for arsenic, barium, cadmium, chromium, lead, nickel, or selenium. 3. Beryllium is an acutely hazardous waste. 4. Mercury is a hazardous waste. Never mix mercury-containing waste with other hazardous waste. 5. Scrap solders containing lead, cadmium or silver are considered hazardous waste unless recycled or reclaimed. 6. Other scrap metals can be placed in the garbage (unless they are coated with hazardous paints). Metal Compounds 1. Arsenic oxides, arsenic acid, phenyl mercuric acetate, strontium sulfide, and vanadium pentoxide are acutely hazardous wastes. 2. Calcium chromate, lead acetate, lead phosphate, selenious acid, selenium dioxide, and selenium sulfide are toxic hazardous wastes. 3. Metallic compounds would be considered hazardous waste if they can not pass the acid leaching tests specified by EPA for arsenic, barium, cadmium, chromium, lead, nickel, or selenium. Minerals 1. Minerals such as carving stones, feldspars, flint, silica, talc, etc. are not considered hazardous waste, and can be placed in the garbage. Oils, Organic Examples: linseed oil, safflower oil, tung oil, turpentine, d-limonene 1. Oil-soaked rags are ignitable due to the risk of spontaneous combustion. 2. If oil-soaked (or solvent-soaked) rags are sent for laundering to laundries equipped to handle them, they are not considered hazardous waste. 3. Oil-soaked rags can also be hung up to dry individually so that heat can't accumulate, and then reused. Organic Peroxides Examples: methyl ethyl ketone peroxide, benzoyl peroxide 1. Organic peroxides can burn or explode if heated. 2. Organic peroxides should be dated and kept in original containers, since many contaminants can react with them. If they dry out, call the fire department for help since they can explode if heated (even from friction). 3. Small amounts of organic peroxides can be reacted with the plastic resin they were bought with to give a nonhazardous solid waste. 4. Large amounts of residual organic peroxides should be disposed of as hazardous waste. Keep separate from other hazardous wastes. 5. Wear appropriate personal protective equipment. Oxidizing Agents Examples: dichromates, chlorates, chromates, hypochlorites, nitric acid (concentrated), periodates, permanganates, persulfates 1. Oxidizers can react with organic materials such as sawdust, solvents, organic resins, starch, etc. to cause fires and explosions. 2. Oxidizers should be disposed of as hazardous waste. Keep them separate from other hazardous waste. Paints and Other Coatings Examples: Paints, varnishes, stains, finishes, sealants Water-based Coatings 1. Paints containing lead, cadmium, or chromate pigments should be disposed of as hazardous waste. 2. Other water-based paints and coatings should be allowed to dry, and then placed in the garbage. 3. Paints containing mercury preservatives should be disposed of as hazardous waste. Solvent-based Coatings 1. Small amounts of solvent-based paints and coatings (less than a cup) can be allowed to evaporate in a laboratory hood, spray booth or outside (if permitted) where no one is exposed. 2. If the residue contains lead, cadmium, or chromate pigments, it should be disposed of as hazardous waste; otherwise the residue can be placed in the garbage. 3. Larger quantities of solvent-based materials should be disposed of as hazardous waste. See also Solvents. 4. Stains containing wood preservatives are considered hazardous waste. See also Pesticides and Preservatives. Patinas - See Metallic Compounds Pesticides 1. Pesticides should be disposed of as hazardous waste. 2. Completely use up pesticides; empty pesticide containers should be triple rinsed. The rinse water should be used as a pesticide. 3. Pesticide spray cans - See Aerosol Spray Cans 4. Wear appropriate personal protective equipment. Photochemicals 1. Old or unused concentrated photochemical solutions or powders, toning solutions, chromium solutions, color processing solutions containing high concentrations of solvents, and platinum/palladium printing solutions should be recycled or disposed of as hazardous waste. 2. Neutralize the alkaline developer by mixing with the stop bath and pouring down the sink with lots of water. Wear appropriate personal protective equipment. 3. Do not treat the fixing bath with acid (e.g mixing with stop bath), since fixing baths usually contain sulfites and bisulfites which will produce sulfur dioxide gas, a respiratory irritant. Mix small amounts of fixer with wash water, and pour down the drain. 4. Many local authorities regulate the amount of silver that can be present in waste water. You should contact your local sewer authorities for informatoin. Silver can be recovered from the fixer by several types of silver recovery systems. The simplest uses steel wool or another source of iron. The iron dissolves and silver is precipitated out. The precipitated silver must be sent to a company that can recover the silver. Kodak has a test kit to test for silver levels in effluent. 5. Replenishment systems, where fresh solutions are added regularly to replace solutions carried out by film or paper, reduce the daily volume of solution needing disposal. Ultimately, you will have to dispose of these replenished systems, using the above guidelines. 6. In most areas, permits are needed to dump photographic wastes into septic systesms. Because of local variations in laws, Kodak no longer recommends dumping photographic wastes into septic systems without checking with local authorities. Previously, they recommended that photographic solutions (including wash water) constitute a maximum of 1/3 of the amount of household sanitary waste going into the septic system, and not to release more than a few pints at any one time. In some areas you need a permit to dump photographic wastes into septic systems. Pigments 1. Lead, chromate, and cadmium pigments should be disposed of as hazardous waste. 2. Other pigments can be placed in the garbage. Dry pigments should be placed in sealed plastic bags. Plaster 1. Plaster is not considered a hazardous waste. Place in the garbage in sealed plastic bags. Plastics 1. Solid plastics are not considered hazardous waste. Plastics Resins Examples: epoxy, methyl methacrylate, phenol- or urea- formaldehyde, polyester, polyurethane. 1. Leftover resins can be reacted with the hardener to form a solid plastic, which can be then be placed in the garbage. 2. Old or large amounts of plastics resins should be disposed of as hazardous waste. 3. Wear appropriate personal protective equipment. Solvents Examples: turpentine, acetone, mineral spirits, methyl ethyl ketone, xylene, toluene, glycol ethers. 1. Small amounts of solvents or solvent-containing materials (e.g. less than a cup) can be evaporated inside a laboratory hood, spray booth, or outside (if permitted) so no one would be exposed. 2. Large amounts of solvents can be mixed together and disposed of as hazardous waste. 3. Chlorinated solvents (e.g. perchloroethylene, methylene chloride, 1,1,1-trichloroethane), or mixtures containing them, should be kept separate from other solvents since hazardous waste containing even small amounts of chlorinated solvents can be considered chlorinated waste and is thus more expensive to dispose of. 4. Waste cleaning solvents containing solids can often be reused by allowing the solids to settle, and filtering. If the solids are toxic, then they should be disposed of as hazardous waste. Otherwise, place them in the garbage. Wood 1. Ordinary wood or wood waste can be recycled, burned as a fuel, or placed in the garbage. 2. Wood that has been treated with wood preservatives such as chromated copper arsenate or other toxic chemicals should be disposed of as hazardous waste. REFERENCES 1. Babin, A., and McCann, M. (1992). Waste Management and Disposal for Artists and Schools. Center for Safety in the Arts, New York. 2. Environmental Protection Agency. (1989). 40 CFR 260-267. Hazardous Waste Management Regulations. Government Printing Office, Washington, DC. 3. Environmental Protection Agency. (1991). 40 CFR 403-424 Effluent Guidelines and Standards. Government Printing Office, Washington, DC. 4. Environmental Protection Agency. (1989). 40 CFR 425-471 Effluent Guidelines and Standards. Government Printing Office, Washington, DC. 5. Environmental Protection Agency. (1990). RCRA Orientation Manual - 1990 Edition. Office of Solid Waste, Washington, DC. 6. Rules of the City of New York. (1992). Use of the Public Sewers, Including Sewer Discharges. Title 15, Chapter 19. New York, NY. 7. New York State Department of Environmental Conservation, Division of Hazardous Substances Regulation. (1988). Are You a Small Quantity Generator? NYSDEC, Albany, NY. 8. Northeast Industrial Waste Exchange, Inc. Listings Catalog, Issue 44, Spring 1992. 90 Presidential Plaza, Suite 122, Syracuse, NY 13202. Tel: (315) 422-6572. 9. Society of Photo Finishing Engineers (SPFE). (1992). Wastewater Regulation Overview. Photo Marketing Association International, Harrison, NY.