The approach for carrier retention sieves has  evolved based on the practical experience. Early designs used vertically mounted stainless-steel flat-panel sieves. Now uses horizontally configured stainless-steel wedge-wire sieves in aerated MBBR applications, because the position and orientation  of  the  sieve  takes  advantage  of  the  media and process aeration grid for scouring.

Stainless steel wedge wire screens retain the cultivated biofilm / media in a process-designated reactor while allowing the treated wastewater and sloughed   biofilm   to   flow   through   to   the next treatment phase

When vertical-mounted flat-panel sieves are used, an air-sparge system should be mounted along the bottom edge of the panels to periodically pulse the sieves and dislodge any accumulated matter. 

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