A mixture of activated sludge and water containing organic matter undergoing activated sludge treatment in an aeration tank.
Source: World Bank
Check Also
Hydrochar turns agricultural waste into a powerful tool for healthier, carbon-rich soils
By converting waste biomass into hydrochar, farmers and land managers may be able to improve soil quality while contributing to carbon management.
Web-Resol Tudo sobre Limpeza Urbana e Resíduos Sólidos!