Wood preservation facilities, copper azole : chapter H-9
9. Waste, Process Emissions and Disposal
For general information on process emissions and disposal, consult Section 9 of Part I, Chapter A - General Recommendations for All Wood Preservatives.
9.1 Control, Treatment and Disposal
Potential process emission sources at CA-B wood preservation facilities were described in Section 5.2 and in Figure 1. The main categories of process wastes and emissions that may be encountered at CA-B facilities, along with their recommended disposal methods, are presented in Table 23 and in Chapter A.
Federal and provincial regimes address hazardous waste and hazardous recyclable material in different manners. Provincial requirements may also differ from province to province. Consult your provincial authority for more information.
9.2 Liquids Containing CA-B
Liquid Process Wastes
Liquid process wastes should not be discharged from CA-B plants. Liquid solutions (such as drips and washwaters) containing CA-B are routinely collected and reused as makeup waters in preparing new treatment solutions. If unusual circumstances (such as prolonged plant shutdown) prevent on-site reuse, transportation to another CA-B facility should be arranged. Disposal of process liquids should be considered only as a last alternative.
9.3 Solids with High CA-B Concentrations
Consult Section 9 of Part I, Chapter A - General Recommendations for All Wood Preservatives.
9.4 Miscellaneous Solid Wastes
CA-B concentrate drums should be rinsed thoroughly (triple-rinsed) with water prior to disposal, and the rinse water should be used for the preparation of working solutions.
Do not use wood treated with CA-B as a compost or mulch.
Incineration of materials contaminated with CA-B is not permitted except in facilities authorized for disposal of such products because of the formation of toxic combustion by-products.
The additive drums (moldicide and defoamer) should be thoroughly triple-rinsed with water prior to disposal, and the rinse water should be used for the preparation of work solutions. These drums should either be returned to supplier if appropriate or disposed of by the appropriate disposal company.
9.5 Air Emissions
The use of an amine formulation at ambient temperature will produce minimal tank emissions from normal operation. Typically no controls are necessary for ambient-temperature solutions of the CA-B product. There should be no in-plant emissions from storage tank vents or vacuum pump exhausts, as these must be vented to the plant exterior with liquid release protection.
The use of heated solutions may imply some potential for amine emissions at the CA-B facility if proper controls are not in place. Consult the chemical supplier.
Refer to Part I, Chapter A - General Recommendations for All Wood Preservatives, Section 9, Table 23 Recommended Practices for Handling Liquid & Solid Wastes and Sludge.
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