and Welding Laboratory
Waste Stream Assessment:
Estimate what percentages
of your waste fall into these common categories. Add your own categories
|___% Finishing Chemicals*
*Surface preparation - paints, strippers, solvents, waste water
look at where you can reduce waste, reuse materials or recycle.
Try to make use of metal working materials made from recycled materials.
Use environmentally friendly products when possible. When dealing with products
that can only be disposed of, choose the least hazardous option.
Use this checklist to identify possible
Finishing Chemical Wastes
chemicals - Do You?
- Keep product lids secure and
closed tightly to prevent spills and evaporation.
- Store containers off the ground
and in an area where they won't corrode. (Store
over spill containing pallets when possible.)
- Remember that any water contaminated
with such chemical waste becomes waste itself.
- Ask your local painting supply
company about regulations in your area, recycling opportunities and
proper disposal methods.
Cutting fluids - Do You?
- Conserve as much as possible.
- Filter solid matter that builds up in fluid.
- Follow all manufacturers recommendations on
fluid use and maintenance.
- Research and choose the optimum fluid for your
common processes and materials
- Select a fluid which may be easily recycled
or select a fluid that is least harmful to the environment.
materials - Do You?
- Determine if coating material
is hazardous. Dry paint may not be considered hazardous.
- Use coating with high solid
content (usually 35% or more), as they require fewer coats.
- Teach students proper and
efficient application techniques.
- Consider water-based coatings.
- Buy only as much as you need.
and solvents - Do You?
- Solvents can be expensive,
treat them so and conserve them.
- Consider less hazardous strippers
- Reuse solvents and strippers
(use dirty solvent to first loosen metal coating and then proceed with
fresh; filter solvents to prolong life.)
must dispose of strippers and solvents: use a legitimate recycling facility
or permitted hazardous waste treatment facility.
- Do You?
- Reuse rinse water for metal
- Dry wipe or brush pieces before
rinsing to prolong the life of your rinse water
- Remember never to put waste
water down a storm drain, sump or septic system. Inquire with
your local water authority and follow their recommendations. This
waste water could be put into a municipal treatment system.
Metal Finishing Chemical Wastes (cont.)
(sawdust, kitty litter and others) -
- Remember that absorbents used
to absorb hazardous materials will become hazardous and require special
- Use drip trays and pans to
- Use squeegees to recover product
and cleanup spills
- Use rags that can be “wrung”
out to recover product.
- Do You?
- Avoid disposable shop rags
and use a shop towel recycling service
- Wring out shop towels to reclaim
solvents and other products (use proper personal protection e.g., gloves).
- Avoid chemicals which may
hinder laundering of shop towels (e.g., perchloroethylene and toluene).
- Keep clean and dirty shop
towels separate and well-labeled containers.
- Do You?
- Return defective cans to supplier; do not throw away.
- Use refillable spray canisters for cutting fluids.
- Remember that only totally empty cans may be landfilled.
Scraps - Do
- Efficiently cut and use metal
to get the most from each piece.
- Reuse scraps for future projects.
and shavings - Do You?
- Always wear personal protective
clothing and respirator when when working around metal dust
- Collect shavings/dust and
store in a bucket. (Check with metal recycler for possible recycling.)
- Try to keep metal shavings
out of sump and drains.
Containers and Packaging of Metal Working Supplies
- Do You?
- Return empty containers to
the distributor for re-use when possible
- Train students to scrape paint
containers clean so they are lawfully “empty”.
- Reuse and recycle
paper and cardboard as recommended under General Housekeeping.
- Buy products with as little packaging as possible.
- Separate reusable and recyclable packaging materials from those that
can only be disposed of.
to all WATER QUALITY, AIR QUALITY and ENERGY CONSERVATION recommendations
listed in General Housekeeping.
- Metal Fabricators Pollution Prevention Workbook, 1999, Pacific
Northwest Pollution Prevention Resource Center http://www.pprc.org/pubs/newsletter/news0997.html.
- Environmental Compliance
Checklist for Vehicle Maintenance Shops, 1998, Montana State University Extension
The P2 audit for Agricultural and Vocational Educators
was produced by the Peaks to Prairies Pollution Prevention Information
Center, funded by the US Environmental Protection Agency.