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It has not been discovered as of yet, where 100% of the sludge is in granular form. Most aerobic granular sludge has 50% and the remaining composition is dense microorganism. Overall, wastewater treatment technology is new and it will be difficult to replace conventional activated sludge processes for the usage of wastewater treatment. [7]
Sludge treatment technologies that are used for thickening or dewatering of sludge have two products: the thickened or dewatered sludge, and a liquid fraction which is called sludge treatment liquids, sludge dewatering streams, liquors, centrate (if it stems from a centrifuge), filtrate (if it stems from a belt filter press) or similar.
The advantages of aerobic granular sludge are excellent settleability, high biomass retention, simultaneous nutrient removal and tolerance to toxicity. Recent studies show that aerobic granular sludge treatment could be a potentially good method to treat high strength wastewaters with nutrients, toxic substances.
Settling stage allows undigested solids to settle. This forms a sludge that must be periodically removed from the system. Disinfecting stage, where chlorine or similar disinfectant is mixed with the water, to produce an antiseptic output. Another option is UV disinfection, where the water is exposed to UV light inside of a UV disinfection unit.
Oxygen is obtained from the atmosphere as the disks rotate. As the micro-organisms grow, they build up on the media until they are sloughed off due to shear forces provided by the rotating discs in the sewage. Effluent from the RBC is then passed through a clarifier where the sloughed biological solids in suspension settle as a sludge. [6]
The sludge is sometimes passed through a so-called pre-thickener which de-waters the sludge. Types of pre-thickeners include centrifugal sludge thickeners, [49] rotary drum sludge thickeners and belt filter presses. [50] Dewatered sludge may be incinerated or transported offsite for disposal in a landfill or use as an agricultural soil ...
The sludge is commonly discarded down the sewer or to landfill. Occasionally, the sludge is used in the production of bricks and concrete, in agriculture as a soil additive, or for land reclamation. In this application, solid bowl centrifuge is used as the final step of the water treatment sludge before disposal in order to reduce landfill ...
Enhanced biological phosphorus removal (EBPR) is a sewage treatment configuration applied to activated sludge systems for the removal of phosphate. [ 1 ] The common element in EBPR implementations is the presence of an anaerobic tank ( nitrate and oxygen are absent) prior to the aeration tank.