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| Subject | English | Estonian |
| life.sc., environ. | activated sludge | biomuda |
| environ. | 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 | aktiivmuda |
| life.sc., environ. | activated sludge | aktiivmuda |
| life.sc., environ. | activated sludge respiration inhibition test | aktiivmuda respiratsiooni inhibeerimise test |
| life.sc. | modified semi-continuous activated sludge test | modifitseeritud poolpidev aktiivmudatest |
| life.sc. | semi-continuous activated sludge test | poolpidev aktiivmudatest |
| life.sc. | semi-continuous activated sludge unit | poolpidevalt töötava aktiivmudatesti seade |