Normal 0 false false false EN-US X-NONE AR-SA MicrosoftInternetExplorer4 Backgrounds and Objectives: Large quantities of sludge are produced in biological wastewater treatment. Because this sludge is highly rotten. it should be stabilized before its disposal. Aerobic and anaerobic digestion is widely considered as stabilization techniques. https://www.lightemupsequences.com/quick-find-Our-Seasons-The-World-in-Winter-Spring-Summer-and-Autumn-best-save/