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activated sludge
environ.	actief slib
hydraul.	belucht slib
life.sc., environ.	actief-slib n; biologisch actief-slib; levend slib
activated sludge Sludge that has been aerated and subjected to bacterial action; used to speed breakdown of organism matter in raw sewage during secondary waste treatment
environ.	actief slib

activated-sludge: 17 phrases in 3 subjects

Earth sciences	1
Environment	13
Life sciences	3