stringent VicRoads specifications needs to be met shifting toward construction stable on-going market Using in landfill NR alternative daily cover, water replacement as biodegradation enhancer leachate risk landfilling valuable WLP components enhancing biodegradation in landfills, can reduce odour and dust control disease since WLP is considered as HHW, it cannot be used in this application in Victoria and there is also enough precipitation in Victoria to provide moisture for landfills Energy Recovery Fuel Blending CS* cement kilns sorting expenses ongoing laboratory testing and costs of valuable WLP components reduce the cost of waste disposal ongoing demand for WLP cannot be reused or recycled * NR : Not Recommended R1: Recommendation 1 R2: Recommendation 2 CS: Current Situation
Table Risk assessment summary for reusing of WLP in concrete Category Risk Likelihood Consequence Risk level Treatment Note Workplace health and safety Workers health due to working with chemicals Possible Moderate High Safety Date Sheet prepared and monitored regularly Concrete industry produces a range of products using chemicals and polymers and use of WLP is similar in nature to those practices. Fire and explosion due to storage and working with waste paint Possible Catastrophic Extreme Fire plan and material safety data sheet required Low air quality in work environment Unlikely Moderate Moderate Air quality monitoring is required Environment Groundwater and stormwater contamination due to leachate* Unlikely Moderate Moderate Research on leachate of contaminant constituents from WLP concrete is required Australian Standard for Leachate Procedure (ASLP) to be followed. Business Negative reputation due to varying quality of final concrete product Possible Major Extreme Continuous quality control of final product More research and field trials prior to any large scale application will minimise uncertainties. Case specific Change of government regulation and budget allocation affecting paint scheme quantity and cost Likely Major Extreme Long-term government plan and commitment
Sorting Paint Similar to current DYH program conducted by toxfree NA Paint extraction Similar to current DYH program conducted by toxfree NA Technical evaluation tests on waste paint Water content, polymer content and pigment content Frequency and number of tests depends on volume, final application and outcomes of initial research work Transport and handling Similar to current procedure from toxfree to geocycle NA WLP Consolidation content needs to be reduced below a certain level determined at the research phase Technical and financial costs vary with water content orf each WLP patch Production line Similar to adding and polymer to concrete An allocated tank (mixer) with capability of weight measurement will be required Volume Considerations for WLP in Asphalt Sealants and PMB The limited data on reusing WLP in asphalt sealants as a replacement for polymer does not provide any details on what percentage of polymer can be replaced with WLP. Research in this application is at its very early stages and as such many assumptions need to be made in volume calculations. The percentage of polymer in asphalt sealants varies from 7 to 20% (King and King 1988). With an assumption that 50% of polymer can be replaced with WLP; the WLP percentage in asphalt sealant will be 3.5% to 10% (average of 7% is used in calculations). Table 13 shows rough estimations on WLP quantity required to replace 50% of polymer used in asphalt sealants. Table 13 Volume considerations for WLP in concrete and asphalt selanats Application Annual production (thousands m3) (Australia) Replaced polymer Required WLP (tonnes) Asphalt Sealants Up to 50 34 kg/m3 1700 Environment Impact Assessment of WLP in Concrete This section provides an overview of the major environmental impacts and considerations associated with recycling WLP in concrete and also asphalt sealants. Understanding the environmental impacts of each option helps in making informed decisions on whether or not to proceed with a project.
Risk assessment summary for reusing of WLP in asphalt sealants Category Risk Likelihood Consequence Risk Treatment Note Workplace health and safety Workers health due to working with chemicals Unlikely Moderate Moderate Safety Date Sheet prepared and monitored regularly Asphalt sealant industry works regularly with chemicals as part of daily operation and this lowers the risk likelihood due to trained and experienced workers. Fire and explosion due to storage and working with waste paint Unlikely Catastrophic Extreme Fire plan and material safety data sheet required Low air quality in work environment Likely Moderate High WLP and mixture temperature and air quality monitoring is required Environment Negative impact on air quality during production and placement Possible Moderate High Research on effect of WLP in air quality during production is essential. The production temperature plays an important role. Business Negative reputation due to varying quality of final product Possible Major Extreme Continuous quality control of product More research and field trials prior to any large scale application will minimise uncertainties. Case specific Change of government regulation and budget allocation affecting waste paint scheme quantity and cost Likely Major Extreme Long-term government plan and commitment