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| Subject | English | Catalan |
| environ. | activated carbon A powdered, granular or pelleted form of amorphous carbon characterized by a very large surface area per unit volume because of an enormous number of fine pores | carbó actiu |
| 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 | llots activats |