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CWTC Service Scope

Enviropace provides collection or disposal service for: Spent chemical mixtures resulting from experiments Surplus and expired chemicals. Enviropace does not provide collection or disposal service for: Non-chemical wastes Asbestos waste Radioactive materials Explosives Gaseous materials

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CWTC Service Scope

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  1. Enviropace provides collection or disposal service for: Spent chemical mixtures resulting from experiments Surplus and expired chemicals Enviropace does not provide collection or disposal service for: Non-chemical wastes Asbestos waste Radioactive materials Explosives Gaseous materials Unknown chemicals CWTC Service Scope

  2. Non-chemical Wastes • Apparatus rinse water and wiping tissues • Household chemicals used in laboratories for cleaning (e.g.- soap, detergents) • Stabilized salts (e.g.- NaCl, Fe2O3, Al2O3) • Dilute acids and alkali with concentration below the definitions of chemical waste in Schedule 1 of the WDO Regulations

  3. Schedule 1 Waste Disposal (Chemical Waste)(General) Regulations

  4. Spent Chemical Mixtures • For each school, Enviropace initially provides a set of three 20-litre pails. - Mixed Spent Organics - Mixed Spent Acids - Mixed Spent Alkali • Collect the waste in 3 beakers of appropriate size, one for each of organics, acids and alkali. • Perform a compatibility test between the content of the beakers and the pail before mixing. • Complete a Waste Log Sheet for each pail.

  5. Waste Log Sheet

  6. Handling Surplus or Expired Chemicals • Leave the chemical in original packing and label bearing the chemical name, quantities, safety precautions, etc. • If the original packing presents a risk of leakage, wrap and seal the bottle in a polythene plastic bag • Includes highly reactive (e.g.- moisture or water reactive) and concentrated compounds • Complete a Labpack Waste Profile Sheet (WPS1) for Enviropace

  7. Example of WPS1

  8. Example of CCL

  9. Collection of Highly Reactive Chemicals • Do not open the bottle • The chemical to be disposed of remains in original container with the lid tightly enclosed • The bottle to be wrapped in a plastic bag and packed in a carton box as an extra cushioning material • Place the carton box into the 20-litre pail • Complete a Labpack Waste Tracking form and attach it on each waste collection pail containing carton box

  10. Labpack Waste Tracking Form

  11. Examples of highly reactive chemicals (collection in carton box) • Air and water reactive • High toxicity • Shock and heat sensitive • Obnoxious or irritating odor • Chemicals that are incompatible with many substances so that they must be containerized in original packing

  12. Examples of other chemicals (collection in original bottles) • Elemental mercury (<15 Kg per pail) • Mercury compounds • Mercury contaminated waste • Solid organic compounds • Solid cyanide compounds

  13. Examples of other chemicals (transfer directly to pails) • Inert inorganic salts • Water insoluble metal carbonates, oxides, hydroxides, sulfides & sulfate salts • Common solvents • Non-reactive aliphatic and aromatic hydrocarbons • General non-halogenated and halogenated organic solvents

  14. Transfer and Dilution of Chemicals • Never pour concentrated acids directly into the waste collection pail • Add the chemical slowly into water • Mixing ratio ~ (Waste : Water = 1:10) • Perform a compatibility testing before transferring two or more types of wastes into the same collection pail • Each pail to be filled up to 70-80% capacity

  15. Compatibility Test Procedures • Perform in a fume hood with the sash half lowered • Use a pipette to draw a 50-ml waste sample from the target waste pail and move to a beaker • Insert a thermometer into the beaker • Mix the chemical waste that is intended to be added into the waste collection pail • Waste compatibility fails if bubbling, fuming or noticeable temp. rise of 10 degree °C in 5 minutes • Stop mixing and inform Enviropace to collect the original bottle

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