Whether collected within wastewater treatment plants, solid waste landfills, or simply on a forest floor, organic solids will naturally degrade and decay under aerobic conditions through the natural process of oxidative breakdown. The microbial cells found in raw sludge will therefore undergo much the same progressive sequence of cell lysis, release of cytoplasmic materials, and final oxidative conversion within an aerobic digester, whereby the organics released from lysed cells serve as a source of substrates for other living aerobic cells. The metabolic conversion of wastewater sludge through aerobic digestion, such as the unit depicted in Figure 16.47, subsequently converts an initially organic-rich sludge matrix into carbon dioxide and residual solids that include not only both inorganic and recalcitrant organic forms but also the remaining complement of meta-bolically active aerobic oxidizers. The resulting product has the advantage not only of
Raw sludge i HRT I A
Thermophilic "Acid-Phase" (Hydrolysis & Acidogenesis)
Acid-Gas Phased "Therms—Mess" Total HRT 12+ days
Was this article helpful?
Quit smoking for good! Stop your bad habits for good, learn to cope with the addiction of cigarettes and how to curb cravings and begin a new life. You will never again have to leave a meeting and find a place outside to smoke, losing valuable time. This is the key to your freedom from addiction, take the first step!