Appendix C: Hazardous Waste Management and Disposal

Management of hazardous waste has three components: minimizing the generation of hazardous waste; record keeping; and hazardous waste disposal.

Minimizing Waste | Record-keeping | Hazardous Waste Manifests | Chemical Disposal by Sewer/Landfill | Hazardous Waste Disposal

Minimizing the generation of hazardous waste

Source reduction: procedures that reduce or eliminate the volume of hazardous waste are encouraged. Workers should use the smallest quantity possible of hazardous materials. Whenever possible, the use of hazardous materials should be avoided.

Source substitution: substitute an alternative less toxic chemical, or use a procedure which does not use toxic chemicals whenever possible.

Recycling: Recycle hazardous waste whenever possible.


Container labeling: Labels on containers should list all the constituents, including water, and their concentration. Concentration is preferably expressed as percentage (w/v or v/v). The container and the associated hazardous waste manifest should be numbered identically.

Minnesota Pollution Control Agency (MPCA) Uniform Hazardous Waste Manifests: MPCA Uniform Hazardous Waste Manifests will be generated by the "University of Minnesota Chemical Safety Day Program" using the Hazardous Chemical Wastes Manifest we submit to them. This manifest will be signed by a member of the biology safety department on the shipping date. One copy will be retained within the department and if needed one copy is sent the CSB/SJU Chemical Hygiene Officer, Ganard Orionzi.

Annually if required, the amount of each class of chemical waste (aerosols, corrosives, flammable liquids, oxidizing liquids, toxic liquids etc.) is reported to MPCA by Environmental Health and Safety.

Hazardous waste manifests:

"University of Minnesota Chemical Safety Day" manifests are completed for used chemicals that have been identified as hazardous waste.

Follow the instructions supplied by the Chemical Safety Day Program.

The manifests must include the EPA Identification Number for the CSB/SJU Biology Department.

For each constituent, the manifests must include its concentration in the mixture, CAS number, DDC number and EPA number. DDC numbers and EPA numbers are listed in the Chemical Registry supplied by the U of M Chemical Safety Day Program, or can be found in a searchable index on-line at HWD Guidebook, Appendix 1 - DEHS, UMN

The manifests must include the number of containers, and the quantity in each container.

Manifests must be submitted by deadline requested to ensure timely disposal.

Make two copies of each manifest. The original manifests are sent to the Chemical Safety Day Program Manager. One copy is retained for department records, and if necessary, one copy is sent to the CSB/SJU Chemical Hygiene Officer, Ganard Orionzi.

Identification of Hazard Level of Chemical Waste:

If the chemical to be disposed is less than 100 milliliters or 100 grams and is included in the list below, it can be disposed in a sewer or landfill. Turn on the cold water and flush the compound down the drain at a rate of 50 ml/minute. Follow with at least 100 volumes of water.

Class of chemical Chemicals that can be disposed in sewer/landfill Special disposal instructions







Neutralize to pH 5-9 with 1M sodium hydroxide or a slurry of sodium bicarbonate
Amino acids, Peptides and Proteins

amino acids



yeast extract

casamino acids




Calcium hydroxide

Potassium hydroxide

Sodium hydroxide

Neutralize to pH 5-9 with citric or acetic acid.








Starch (corn, potato, soluble)



Calcium sulfate

Cesium chloride

Magnesium chloride

Magnesium sulfate

Potassium acetate

Potassium bicarbonate

Potassium chloride

Potassium phosphate, monobasic

Potassium phosphate, dibasic

Potassium sulfate

Sodium acetate

Sodium bicarbonate

Sodium citrate

Sodium chloride

Sodium lactate

Sodium phosphate, monobasic

Sodcium phosphate, dibasic

Sodium sulfate

Check the pH. If necessary, neutralize to pH 5-9.
Mixtures Mixtures can only be disposed in the sewer if all compounds in the mixture are on the list.


Chemicals of unknown hazard potential:

Use the "Hazard Determination Record for Chemical Wastes" if uncertain whether concentrations or kinds of chemical are hazardous. This form and its accompanying instructions are found in Appendix E. If identified as a hazardous waste, complete a University of Minnesota Chemical Safety Day Program Hazardous Waste Manifest. If it is not identified as a hazardous waste, determine and record the appropriate means of disposal.

Disposal of Hazardous Waste

Through the University of Minnesota Chemical Safety Day Program, hazardous waste is disposed up to four times per year. At minimum, collected waste from the biology department should be disposed at least twice a year.

Waste should be packaged in screw-top containers, preferably plastic. Fill the waste containers no more than 3/4 full.

Containers should be clearly labeled and include a number referring to the appropriate manifest.

When a waste container is ready for disposal, the generators should transport the container to NSC 130 using appropriate transportation devices and personal protective equipment. The container should be placed on appropriate shelving.

The pH of mixtures will be measured using pH paper for colorless liquids, and a pH meter for colored liquids. The pH is recorded on its hazardous waste manifest.

If possible, segregate the waste by chemical class: separate flammables from oxidizers; acids from bases.

Carol Jansky or a Biology Safety Committee student worker will complete the manifests. After completing the manifest, it will be sent to the generator of the waste. If the listing of constituents and their concentrations is accurate, then the generator will sign and date the manifest.

After submitting the hazardous chemical manifests, U of M Chemical Safety Program employees, first inspect and package waste for shipping. The pickup for shipping hazardous wastes occurs usually one week later.