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Pollution Prevention
Tips
Glass Industry
- Waste glass or cullet
are increasingly used as a feedstock-manufacturers now typically use 30
percent cullet mixed with raw materials to make new glass.
- Spent refractory brick
can be used as a feedstock, although recycling of this material represents a
relatively minor pollution prevention opportunity.
- Glass container recycling has increased from 20
percent in the 1980s to 37 percent to in the 1990s.
Printing and Publishing Industry
- Used plates and plate
materials are recycled back to the metal manufacturer or a metal recover
during pre-press-plate making operations.
- Certain waste inks and product rejects are recycled
during press operations
Motor Vehicle Assembly Industry
- Waste oil is recovered
at stamping, machining, and engine plants, and remanufactured on-site for
return to the process
- Durable returnable and reusable containers are
designed and recycled to reduce paper, metal, and wooden packaging materials
at motor vehicle assembly plants.
Textile Industry
- Water is reused by
application of countercurrent wash in the preparation processes.
- Reuse dyebaths and
bleach baths in the bleaching and dyeing operations, successful full-scale
applications include knit, yarn, and woven fabric products .
- Reuse of synthetic (PVA)
size using membrane filtration equipment. At present only 30% of textile
operations use PVA, while the remainder still use starch (which cannot be
recovered). The recovery rate for PVA is still only 30%.
- Caustic reclamation by evaporative method in the
mercerizing process.
Fabricated Metal Production
Industry
- Recycling of oil from
cutting and machining operations
- Oil scrap mixtures are
centrifgued to recover the bilk of the oil for reuse.
- Reuse of cutting
fluids through ultrafiltration
- Regeneration and reuse
of aluminum chemical milling solutions
- Recovery of metal working fluids
Electronic and Computer Industry
- Reuse of drag-out
waste back to process tank
- Process chemicals are
recovered from fog rinsing parts over plating baths
- Evaporate and
concentrate rinse baths for recycling
- Metals are recovered
from sludge
- Reuse of rinse water in plating operations
Metal Casting Industry
- In-process recycling of electric are furnace dust
involves palletizing and then reusing the pellets in the furnace; for some
foundries, this on-site dust recycling is not technically o economically
competitive
Wood Furniture and Fixtures
Industry
- Recycle spent solvents with recovery units,
including:small, on-site recovery of spent lacquer thinner; small, in-house
recycling of methylene chloride and xylene; batch distillation to recover
isopropyle acetate; and small recovery systems for spent paint and methyle
ethyl ketone.
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