Plug-flow activated sludge process

Fig. 3 Plug-flow activated sludge process schematic. (Note The aeration tank is a plug-flow reactor with an average biomass concentration of Xav and effluent substrate concentration of S.)...

Fig. 13. Types of activated sludge processes (a) plug flow (b) complete mix (c) selector-activated sludge.

Comminution Shredding. A mechanical treatment process which cuts large pieces of waste into smaller pieces so that they won t plug pipes or damage equipment. Contact stabilization Contact stabilization is a modification of the conventional activated sludge process. In contact stabilization, two aeration tanks are used. One tank is for separate reaeration of the return sludge for at least four hours before it is permitted to flow into the other aeration tank to be mixed with the primary effluent requiring treatment. 

The procedure to foUow in designing PAC-activated sludge systems for nitrification involves a modification to those for complete mix or conventional plug flow systems (39) in order to account for the effects of the addition of PAC. According to major suppliers of the technology (38 2), most PAC process systems are designed at MUSS concentrations of approx 15,000 mg/L. The mixed liquor is composed of volatile activated carbon, biomass, nonvolatile PAC ash, biomass decay components, and influent inert material. The... 

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