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| Catalan | English |
| estabilització del fang | sludge stabilisation Usually anaerobic sludge digestion, a treatment that stabilizes raw sludge. Fully digested sludge has little readily biodegradable organic matter. It is not smelly and about 50% of the solids are inorganic. Sludge can also be digested aerobically |
| fang actiu | digested sludge Sludge or thickened mixture of sewage solids with water that has been decomposed by anaerobic bacteria |
| fang d'aigües residuals | sewage sludge A semi-liquid waste with a solid concentration in excess of 2500 parts per million, obtained from the purification of municipal sewage |
| fang d'aigües residuals | waste water sludge The removed materials resulting from physical, biological and chemical treatment of waste water |
| fang deshidratat | dehydrated sludge Sludge whose water content has been reduced by physical means |
| fang industrial | industrial sludge Sludge produced as a result of industrial production processes or manufacturing |
| fang residual de depuradora | residual waste sludge The excess, unusable semi-solids or sediment resulting from a wastewater treatment or industrial process |