Automated Chemical Stabilization of Leaded Paint Residue from Bridge Maintenance Painting

摘要

This study addressed the use of automated equipment to dose and mix lead stabilizing compounds to allow leaded paint residue/debris to be disposed at in-state contained landfills. The stabilizing would be conducted in situ at bridges being subjected to maintenance painting operations involving total coating removal and replacement. Many Kentucky bridges have existing painting that contains lead compounds at levels which may constitute hazardous wastes upon removal. The KYTC practice of recycling lead containing residue is working well at this time but the issue of a single recycler available continues to place KYTC in position of returning to hazardous waste disposal should the recycling option be removed. Limited field sampling and testing of removed paint residue indicates high total lead content but, typically below the 5mg/L, TCLP action level. A previous KTC report indicated that TCLP test results of paint removal residue eill often be less that 5 mg/L, however some samples with exceed the hazardous waste threshold. KYTCshould pursue the chemical stabilization of paint removal residue to provide an additional option to hazardous waste handling and disposal.