draw a schematic diagram of an activated sludge system that includes a "selector". describe the function...

draw a schematic diagram of an activated sludge system that includes a "selector". describe the function of the "selector" and describe how this process configuration and associated operating strategy is different from a "conventional" activated sludge system.

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Expert Solution

Functions of selector in activated sludge system:
there are three types of selectors - aerobic, anoxic and anaerobic (aerobic selector is the most effective one).
They functions by controlling the growth of filamentous bacteria, that cause bulking.
These selectors can produce BOD concentration gradient
Selectors can improve settleabilty of these bacterial colonies.
They also provide good growth conditions to this forming filamentous bacteria.
under anoxic and anaerobic conditions- the bacteria can't use nitrate as its electron acceptor .and also these filamentous can't take acetate as they lack storae of phosphatase.

Comparison of selector activated sludge system and conventional activated sludge system

selector are used in combination with reactors such asditch type reactor or step feed reactor or plug flow reactor or complete mixer reactor but conventional type do not use any specific reactors
conventional type is used to elimate BOD while selectors are based on contact time during peak output and rbCOD loading at that zone

Sydney Mullin answered 11 months ago

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