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Waste Disposal

Hazardous wastes are used or unwanted chemical, radioactive or biomedical wastes. All hazardous wastes must be disposed of through the Safety services provided by the school.

Types of Wastes

Waste types are radioactive, chemical, biomedical, biohazardous, laboratory glass and plastics, and general refuse. Each one of these types requires disposal in a specific manner. Therefore, care must be taken to ensure different wastes are not mixed together. Waste materials are segregated into one of the six waste types:

1. Radioactive Waste

All forms of radioactive waste shall be disposed of through Safety services. Please contact Safety on ext. XXXX for specific instructions.

2. Chemical waste

  • All forms of chemical waste such as halogenated solvents, non-halogenated solvents, aqueous acids & bases as well as laboratory chemicals must be disposed of through Safety services.

  • Empty containers which held hazardous chemicals and chemically contaminated glass/plastic shall be cleaned carefully and disposed of as waste laboratory glass/plastic. If cleaning is not possible, dispose as contaminated waste

  • Sharps which are chemically contaminated are not to be disposed of as waste laboratory glass/plastic but as biomedical wastes.

  • Complete the Chemical Waste Disposal Form and email scbesafety@ntu.edu.sg for pickup.

3. Biomedical waste

  • Biomedical Wastes are ALL SHARPS needles, syringes, scalpels, razor blades, etc. (not clean broken glassware and plastics), and items that are visibly contaminated with animal or human blood.

  • Place the biomedical waste in the yellow containers provided by Safety services.

  • Do not overfill containers. Fill only up to ¾ full and secured lids in place.

  • Label with the following information:

    • Contact name:
    • Building:
    • Laboratory/centre

4. Biohazardous waste

  • Biohazardous wastes except blood and sharps, should be autoclaved and disposed of into the regular garbage.
  • Containers of Agar or similar material are to be autoclaved and placed in plastic bags, sealed and disposed of as normal waste.

5. Clean laboratory glass/plastic waste

  • Obtain “waste glass / plastic containers” from Safety services to dispose clean laboratory glass/plastic.

  • Only place clean rinsed laboratory glass and plastic items into these containers.

  • All labels on chemical containers must be removed prior to disposal.

  • Clean Laboratory Glass and Plastic means all glass or plastic materials used in laboratories, such as: beakers, flasks, test tubes, empty chemical bottles and containers, pipettes, and other similar objects (broken or unbroken). The items must be:

    • Free of radioactive contamination

    • Not contaminated by human or animal blood or body fluids

    • Free of chemical contamination

  • Label with the following information:

    • Contact name:

    • Building:

    • Laboratory/centre:

6. Normal waste

  • General refuse (plastic, cardboard, paper) is disposed of in standard waste paper baskets.

  • This waste must not contain any radioactive, chemical, or biomedical materials.

  • No liquids of any kind (sterile water, saline, etc.), nor grease or motor oil may be placed into the general refuse.

  • General refuse type wastes are removed by the cleaners.

Waste Disposal Procedure

To request for a waste pickup:

  • Email your request to scbesafety@ntu.edu.sg or call Chitra at 8918, Wei Wei 8917, Joo Luang 5336 with the following information:
  • Contact name
  • Telephone number
  • Building and laboratory/centre where the waste containers are located
  • The number and type of waste containers to be picked up.
  • For chemical waste, complete and attach the Chemical Waste Disposal Form
  • Safety services provide hazardous waste pickups on Monday of the first week of every month. In case of a holiday, the next day will be the pick up day.
  • Email will be sent to all researchers and lab technicians two days in advance.
  • If the waste is not correctly prepared, Safety Services will refuse the collection until the necessary corrections have been made.

Note that:

  • All waste must be properly labeled.

  • Do not fill liquid containers more than 90% full.

  • Unidentified and unlabelled waste will not be accepted for pickup.

  • Waste must be collected in the provided containers.

  • Regulations prohibit the sink or drain disposal of any hazardous wastes.

  • Segregate waste according to the classes as halogenated, non-halogenated, aqueous acids and bases, biomedical …etc

  • Waste containers must be secured at all times and the waste container closed except when adding or removing waste.

  • For more information call Safety services at Ext.: XXXX

 

 

 

   
   
Copyright © 2005 SCBE, NTU
N1.2-B3-13, 62 Nanyang Drive Singapore, 637459
Tel: +65 6790 6742, Fax: +65 6794 7553
Email: SCBE@ntu.edu.sg