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?Activated sludge process (ASP) is a type of biological wastewater treatment process for treating sewage or industrial wastewaters using aeration and a biological floc composed of bacteria and protozoa.Different boundary conditions, such as the hydraulic residence time (HRT) in the aeration tank, which is defined as the aeration tank volume divided by the flow rate, control the removal efficiency.There are many different designs, but in general, all ASP have three main components: an aeration tank that serves as a bio reactor; a settling tank for separating AS solids and treated waste water; and a return activated sludge (RAS) equipment that transfers settled AS from the clarifier to the aeration tank's influent.


Original text

‏Activated sludge process (ASP) is a type of biological wastewater treatment process for treating sewage or industrial wastewaters using aeration and a biological floc composed of bacteria and protozoa. It uses air (or oxygen) and microorganisms to biologically oxidize organic pollutants, producing a waste sludge (or floc) containing the oxidized


‏material. There are many different designs, but in general, all ASP have three main components: an aeration tank that serves as a bio reactor; a settling tank for separating AS solids and treated waste water; and a return activated sludge (RAS) equipment that transfers settled AS from the clarifier to the aeration tank's influent.


‏The concentration of biodegradable components in the influent is reduced in all activated sludge plants due to biological (and sometimes chemical) processes in the aeration tank. Different boundary conditions, such as the hydraulic residence time (HRT) in the aeration tank, which is defined as the aeration tank volume divided by the flow rate, control the removal efficiency.


‏The activated sludge process in wastewater treatment involves injecting oxygen or air into raw, unsettled sewage. The solids are smashed during this process. The sewage is bubbled, and the sewage liquor is discharged into a chamber with activated sludge. Live bacteria sink to the bottom of the tank, while dead bacteria float to the surface. While the live bacteria return to the digestion chamber, clean water is discharged into a soak


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