by-product
unwanted secondary product of a production process, manufacturing process or chemical reaction
slag
glass-like by-product left over after a desired metal has been separated from its raw ore
waste heat
Waste heat is by necessity produced both by machines that do work and in other processes that use energy, for example in a refrigerator warming the room air or a combustion engine releasing heat into the environment.
brewer's spent grain
brewing residue
bort
variation of diamond (powder end particles), applied in abrasives, polishing agents, lubricants and on drilling & cutting tools/machinery
government spin-off
civilian goods which are the result of military or governmental research
ash
waste product of fire; the end product of incomplete combustion; the solid remains of fires; specifically, it refers to all non-aqueous, non-gaseous residues that remain after something is burned
pomace
remains of pressing fruit
data exhaust
data left as a side effect of computer use
produced water
water as a byproduct of oil production
rice hulls
husk of rice grains
dross
impurities in molten metal
sewage sludge
by-product of sewage treatment
coffee wastewater
byproduct of coffee processing
software development artifact
tangible by-product produced during the development of software
chaff
protective casings of the seeds of cereal grain
contrail
long, thin artificial clouds that sometimes form behind aircraft
distillers grains
cereal residues from alcohol production
rest wood
waste-product
sawdust
loose matter made of finely divided wood particles
silica fume
ultrafine amorphous silica spheres recovered from the silicon and ferrosilicon alloy production
radioactive waste
waste containing radioactive material and emitting ionizing radiation
sprue
channel through which liquid material enters a mold, or excess material that solidifies in such a channel and is later removed
amurca
byproduct of olive oil production