What is activated sludge?
It is a flocked sludge with a certain vitality and sewage purification function composed of bacteria micelles, protozoa, metazoans and other microbial groups and organic and inorganic substances in the adsorbed sewage.
The process of activated sludge degrading organic matter in sewage
The microbial populations that participate in the treatment of sewage activated sludge are mainly aerobic bacteria.
Aerobic Granular Sludge (AGS) is a granular activated sludge formed by microbial self-agglomeration.
Compared with regular activated sludge, it is less prone to sludge bulking, has strong impact resistance, can withstand high organic load, and integrates microorganisms of different properties.
Aerobic granular sludge has a dense structure and large particle size. Due to the limitation of oxygen mass transfer, the granular sludge presents an aerobic zone outside and anoxic or anaerobic zone inside, which is aerobic, facultative and anaerobic. Anaerobic microorganisms provide their own suitable living environment, thus enabling aerobic granular sludge to carry out various aerobic and anaerobic metabolic activities.
Compared with traditional activated sludge flocs, aerobic granular sludge has the following advantages: regular shape, compact and compact structure, good settling performance, high biomass, and at the same time, it has a variety of microbial functions, and the amount of excess sludge is small. It has become one of the most promising biological wastewater treatment technologies due to its high tolerance to biological toxins and organic load fluctuations.