Containers holding waste must be in good condition, not leaking, and compatible with the waste being stored. The container must always be closed during storage, except when it is necessary to add waste. Hazardous waste must not be placed in unwashed containers that previously held an incompatible material (see Incompatibility chart in APPENDICES).
If a container holding hazardous waste is not in good condition or if it begins to leak, the generator must transfer the waste from this container to a container that is in good condition, overpack the container, or manage the waste in some other way that prevents a potential for a release or contamination. Please contact EHS at 710-2900, if assistance is required.
A storage container holding a hazardous waste that is incompatible with any waste or other materials stored nearby in other containers must be separated from the other materials or protected from them by means of a partition, wall or other device.
All waste containers must be:
Note: Do not use Red bags, Sharps containers (Biohazard), or Asbestos bags for hazardous chemical waste collection.
A generator of possible hazardous waste may accumulate up to a total of 55 gallons of waste, which may be determined to be hazardous by the Office of Environmental Health and Safety, or one quart of "listed" acutely hazardous waste (see Appendix IV) at or near the point of generation. If a process will generate more than this volume at one time, the Office of Environmental Health and Safety should be contacted in advance to arrange a special waste pick up.
Whenever possible, keep different hazardous wastes separate so that disposal options remain clearer and more cost effective. In all cases, do not mix incompatible wastes or other materials (see Appendix III) in the same container or place wastes in an unwashed container that previously held an incompatible waste or material. However, if separation is not practical, collect waste in compatible containers and try to keep it segregated into the following categories:
Before chemical waste can be picked up by EHS, a waste tag is required. It should be filled out by the waste generator and attached to each container. The information on the tag is used to categorize and treat the waste. Please fill them out legibly, accurately and completely.
Note: Biological Waste and Sharps containers do not require waste tags.
When your container is ready for disposal and is properly tagged, contact EHS by submitting a Waste Pickup Request to EHS.
Contents Specific, full chemical name, no formulas or abbreviations. Product names or trade names are acceptable if the manufacturer's name and address or a material safety data sheet can be supplied with the material. Vague statements such as "hydrocarbons", "organic waste", "various salts of ..." make it impossible to comply with EPA treatment standards and will delay the pick-up until sufficiently detailed information is submitted to EHS.
The following checklist should be used in determining whether or not a waste may be disposed of in the sanitary sewer or municipal trash. This checklist does not apply to wastes which are radioactive or mixed in nature.
Does the material meet any of the following criteria?
If the material has not been used, does it meet any of the following criteria?
|If the answer to any of the preceding questions is "yes," then the waste is regulated and must not be disposed of via sanitary sewer. Please refer to the disposal procedures outlined in Section II (Disposal Procedures for Regulated Wastes) of this chapter.|
If the material is not a hazardous waste, please answer the following questions:
|If the answer to the preceding question is "no," then the waste is prohibited by the City of Waco POTW and must not be disposed of via sanitary sewer. Please refer to the disposal procedures outlined in section II of this chapter (Disposal Procedures for Regulated Wastes).|
|Carbon tetrachloride||Methylene chloride|
|Copper 1.9 mg/L|
|Nickel 1.6 mg/L|
|Zinc 2.3 mg/L|
|Fluorides 65 mg/L|
|Cyanides 1.0 mg/L|
|Manganese 6.1 mg/L|
|If the answers to the two preceding questions are "yes," then the waste is prohibited by the City of Waco POTW and must not be disposed of via sanitary sewer. Please refer to the disposal procedures outlined in section II of this chapter (Disposal Procedures for Regulated Wastes). Otherwise, the material is acceptable for sanitary sewer disposal if it is a liquid or for trash disposal if it is a solid. The discharge of wastes to the sanitary sewer should be accompanied with copious amounts of water a good rule of thumb is to use a 100-fold excess of water when discharging wastes to the sanitary sewer.|
Examples of Non-Regulated Chemicals
The following are examples of nonhazardous chemicals which may be disposed of either in the general trash (for solids) or the sanitary sewer (for liquids). For a more complete list, please consult Appendix I.
|Adenosine 3'-monophosphate, sodium salt|
|Albumin, bovine, methylated|
|Bacto peptone; Peptone|
Disposal procedures for empty containers depends on the previous contents and the efficiency of emptying them. Containers of pourable contents must be completely emptied. Containers of thick or solidified materials must be scraped out or drained until no more than one inch of material remains in the bottom of the container or no more than 3% of the original weight of the contents remains, whichever is less. Chemical containers that meet these criteria are considered empty and may be disposed of given the following provisions:
If containers are not or cannot be emptied, or if they contained acutely hazardous waste, submit them to EHS as waste in accordance with the procedures described in these procedures. You can also utilize a used container to hold waste for pick up if the waste is compatible with the residue in the container, the label is defaced, and the container is in good condition and not leaking.
Containers that held compressed gases are to be picked up intact by EHS. Empty cylinders should be tagged in the same manner as other waste, with the previous contents listed and the notation (EMPTY) on both the tag and the Waste Pickup Request.
Scientific and engineering research and teaching activities in academic institutions can result in the generation of relatively small quantities of a wide variety of waste and surplus chemicals. The small-scale treatment and deactivation of these sorts of chemical products and by-products as part of the experimental plan (i.e., as part of the routine procedure) is one approach that can be used to address the problem of waste minimization at the laboratory level. Several texts have been published that deal with this issue - two particularly good examples are:
To enhance safety and minimize the environmental consequences of an experiment, careful thought should be given to the materials to be used and the scale of the experiment. Traditionally, chemists have chosen reagents and materials for experiments to meet scientific criteria without always giving careful consideration to waste minimization or environmental objectives. In synthetic procedures, overall yield and purity of the desired product were usually regarded as the most important factors. Material substitution emerged as an important consideration in manufacturing process design because of the large quantities of chemicals involved. The following questions should now be considered when choosing a material to be used as a reagent or solvent in an experimental procedure:
The following examples illustrate applications of these principles to common laboratory procedures: