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Chemical Waste

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Chemical Waste Chemical Waste Policy All chemical wastes generated by HKU are In general chemical waste is segregated at source subject to the Waste Disposal (Chemical Waste) and collected in a variety of containers provided (General) Regulations made under the Waste by the chemical waste collector. The Dangerous Disposal Ordinance, which require control over Goods team of the Safety Office provides a the handling, collection, storage, transport, and service to collect and dispose of the waste disposal of such wastes. appropriately. Essentially, these regulations prohibit the tipping of chemical waste into water sources and prescribe for its proper treatment and disposal. __________________________________________ Responsibilities The Department Head must: The Safety Office will: appoint a chemical waste manager to ensure apply for Waster Producer Licences from the requirements of the chemical waste the Environmental Protection Department guidance are followed. (EPD). provide resources to procure chemical provide a chemical waste programme waste cabinets and spill trays. incorporating supply of waste containers, ensure that the checklist (Appendix IX) is labels, and collection of waste. completed regularly to monitor compliance. arrange final disposal with contractors. ensure trip ticket administration is The Departmental Chemical Waste Manager completed to EPD's satisfaction. should: provide spill trays for Departments. direct and co-ordinate the handling of provide Chemical Waste Warning signs. chemical wastes. monitor the effluents to comply with ensure each pail has an accompany log licence conditions sheet that was filled. The Contractor will: provide containers of appropriate materials and construction for each type of waste. __________________________________________ Prepared by: Safety Office Approved by: Safety, Health & Environment Committee Issue Date: Dec. 2012 Chemical Waste v. 3 Page 1 of 28 Review Date: Dec. 2014 (d)Irene/…/Chem Waste 5Dec12 Guidance 1. General Requirements 1.1 Classification 1.2 Segregation 1.3 Packaging 1.4 Labelling 1.5 Storage 2. Handling 2.1 Service 2.2 Chemical Waste Manager 2.3 Spent Chemicals 2.4 Surplus or expired Chemicals 2.5 Compatibility 2.6 Personal Protective Equipment 2.7 Collection Service 3. Liquid Effluent 3.1 Introduction 3.2 Practice 3.3 Standards for Effluents 4. Appendices Appendix I: Classification of Chemical Wastes Appendix II: Chemical Waste Storage Arrangements Appendix III: Waste Streams and Containers Appendix IV: Explosive Substances Appendix V: Water Reactive Substances Appendix VI: Hazardous Waste Compatibility Chart Appendix VII: Chemical Waste Log Sheets Appendix VIII: Labpack Form Appendix IX: Checklist Prepared by: Safety Office Approved by: Safety, Health & Environment Committee Issue Date: Dec. 2012 Chemical Waste v. 3 Page 2 of 28 Review Date: Dec. 2014 (d)Irene/…/Chem Waste 5Dec12 1. General Requirement chemicals (including strong oxidizing and reducing agents, catalyst), the waste 1.1 Classification of Laboratory Chemical should be stabilized prior to storage in Waste the same container of compatible waste type. Chemical wastes generated from the laboratories are generally of small quantity and relatively 1.2.3 Surplus or expired chemicals should be dilute in nature. However, a few common waste segregated, individually packaged and types are classifiable as chemical waste (as labelled for storage, prior to collection. defined in Schedule 1 to the Regulations, also listed in Appendix I). 1.3 Packaging They include the following: 1.3.1 Standard of Containers (a) strong acids and alkalis; Chemical wastes should be poured into the (b) spent organic solvents and appropriate containers provided by the Safety (c) surplus or expired chemicals. Office and supplied by Ecospace. 1.2 Segregation 1.3.2 Number and Capacity of Containers Workplaces should have sufficient chemical 1.2.1 Given the varied nature of chemical waste containers to ensure all the chemical waste wastes generated by laboratories, wastes that may be generated or produced at their should be segregated according to the premises between period of collection by Safety following classification: Office can be stored safely. Acids plus wastes compatible with acids (A); 1.3.3 Containers to be Securely Closed and Alkalis plus wastes compatible with with Clean External Surface alkalis (B); Every chemical waste container should be Organic solvents (O); and properly closed and stored. The container should wastes that requires special handling (S). be kept clean. These include such chemicals as ammonia, hydrogen peroxide, 1.3.4 Containers to be in Good Condition hypochlorite solutions and strong While the Safety Office will endeavour to ensure oxidising acids (e.g. nitric, perchloric). waste containers are in good condition, the waste Chemical wastes falling into this producers should check to ensure that the category must be segregated for storage containers are in good condition before use. and should be individually packaged and labelled. 1.3.5 Separate Containers for Different Waste Categories 1.2.2 For laboratory chemical waste which also contains other very reactive substances or Separate containers must be used for different waste categories. Inorganic wastes should be Prepared by: Safety Office Approved by: Safety, Health & Environment Committee Issue Date: Dec. 2012 Chemical Waste v. 3 Page 3 of 28 Review Date: Dec. 2014 (d)Irene/…/Chem Waste 5Dec12 separated from organic wastes and separate - name, address and contact telephone number containers should also be provided for the of the waste producer; storage of acid or alkali wastes. - chemical name(s), common name(s) or waste type(s); and 1.3.6 Incompatible Wastes - appropriate hazard warning symbol. Incompatible types of wastes should not be mixed in the same container. Chemical wastes The dimensions of the label should not be less that are incompatible generally include those than 90 mm x 100 mm. that will react with each other: 1.4.3 The chemical waste producer should - violently; or ensure that the information contained on - with evolution of substantial heat; or the label is accurate and sufficient so as - with evolution of toxic or harmful gases; to enable proper and safe handling, or storage and transport of the chemical - to produce flammable products; or waste. - to produce toxic products. 1.4.4 The label should be securely attached to 1.3.7 Ullage (Airspace) a suitable part of the container, which When filling the container with liquid chemical allows the information on the label to be wastes, sufficient ullage (air space) should be easily read, be kept clean and free from allowed for to ensure that neither leakage nor obstruction. permanent distortion of the container occurs as a result of liquid expansion caused by changes in 1.5 Storage temperature or other physical conditions which are likely to occur under normal conditions of 1.5.1 Chemical wastes should be stored in a handling, storage and transport. Generally 10cm storage cupboard which is fitted with air space should be sufficient. leakproof sill or spill catcher trays in its base to retain the capacity of the largest 1.4 Labelling container or 20% by volume of the total storage capacity in that cupboard 1.4.1 Every container for chemical waste whichever is the greater in case of storage should be provided an spillage or leakage from the containers. appropriate label in both English and Chinese in the form specified in the 1.5.2 The material used for the construction of Regulation. the leakproof sill or spill catcher trays should be able to withstand the chemical 1.4.2 The label should include the following action of the stored chemical waste. particulars: Examples of a stainless steel spill catcher - the words and characters 'CHEMICAL tray to be used with containers or organic WASTE'; wastes, and a heavy-duty plastic spill catcher tray to be used with containers of Prepared by: Safety Office Approved by: Safety, Health & Environment Committee Issue Date: Dec. 2012 Chemical Waste v. 3 Page 4 of 28 Review Date: Dec. 2014 (d)Irene/…/Chem Waste 5Dec12 inorganic wastes (including strong acids definition of 'chemical waste', and can and alkalis), are shown in Appendix II, be accepted by the CWTC for treatment. Sketches B and C respectively. 2.1.3 The Regulations target specific 1.5.3 Incompatible chemical wastes which substances in forms or concentrations when in contact with one another may that pose significant threat to health and produce dangerous consequences should the environment. The following either be stored separately or in a cabinet examples are what, according to the provided with compartments separated Regulation and EPD's guidelines, are not from each other by impermeable chemical wastes: partitions. (a) Neutralised salts that do not contain 1.5.4 The storage cupboard should be provided compounds listed in Append IX. with adequate ventilation by means of (b) Apparatus rinse water and wiping tissue openings to prevent the formation of any with low chemical contents. dangerous or harmful concentration of (c) Elemental heavy metals in stable form vapour. An example of such a cupboard, (e.g. lead, copper, chromium, nickel) and illustrations of how it could be used (d) Household chemicals used in laboratories to store chemical wastes are shown in for cleaning (e.g. soap, detergents). Sketches A, D and E of Appendix II. (e) Dilute acids and alkalis with concentration below those stipulated in 1.5.5 A site for Chemical Waste storage must Appendix I. not obstruct any means of escape. 2.1.4 A list of waste streams and respective 2. Chemical Waste Handling containers are shown in Appendix III. 2.1 Service 2.1.5 Ecospace does not provide service for the following substances as they are not 2.1.1 The D.G. Team of the Safety Office accepted at the CWTC: will collect waste from departments/ asbestos, laboratories etc. and accumulates it in Radioactive materials, appropriate stores to await collection by explosives, Ecospace. gaseous materials. 2.1.2 Ecospace will eventually collect and This list includes mixtures of spent chemicals dispose of: that pose an explosion hazard.
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