scum

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scum

(skŭm),
A film of insoluble material that rises to the surface of a liquid, as in epistasis.
[M.E.]

scum

(skŭm) [ME. scume]
Slimy floating islands of bacteria or impurities on the surface of a culture; an interrupted pellicle of bacterial growth.
References in periodicals archive ?
They didn't have a local process for dross (at the time) and were sending it over to Australia for processing and they wanted one in-house.
Aluminium dross is classified as a toxic industrial waste and it requires a proper treatment before it can be discharged.
STAR Coating prevents contamination of the aluminium and dross build-up in the crucible, ensuring the highest purity of metal when melting aluminium and aluminium alloys.
As an example, in 2015 recycling lead-free wave solder dross provided a cost payback of approximately $10 per lb.
Since we needed to decide the ideal concrete design including aluminium dross, we had to prepare a lot of mix designs and perform a lot of tests on a big number of samples," she added.
Dross, it's time for Exotic Voyages to gain more success in Asia.
It has been possible to reduce our loss by having the furnace tenders massage the dross very diligently.
As per the contract, TIC is to invest in a new system to recover aluminium metal from dross, which is a by-product of aluminium smelting and re-melting.
Dross is a by-product of aluminium smelting and re-melting, which has traditionally been recycled using salts and flux to recover available metal.
Qatalum has sent its dross to Bahrain where it is treated in the old-fashioned way.
Traditionally aluminium is extracted from dross left over from the smelter process by using chemicals and this results in the production of toxic waste.