Perforated Fine Screen Screenings Washer/Compactor: Lessons Learned

Description:More and more WWTPs are replacing coarse raw sewage screening equipment with perforated plate, two dimensional fine screens with perforation size of 6mm diameter or less. The fine screens remove a significantly greater fraction of unwanted material in comparison to existing vertical slot bar screens. The result is reduced downstream operational requirements and the associated costs related to the accumulation of unwanted soilds and debris. With this change to fine screening, the volume and nature of the screenings markedly altered. As part of this change to fine screens, washeer/compactor equipment is also being added to the screening process in attempts to recove soluble and usable particulate organics which are necessary for downstream processes for a BNR plant and to reduce compacted screenings disposal costs. In the Okanagan valley, the WWTPs for Penticton, Kelowna, and Westside have completed upgrades or upgrades are underway for raw sewage fine screening and washing/compaction of screenings. These facilities have installed fine screens and washer/compactors from different vendors that utilize variations in the technology. This presentation will summarize the design issues for the fine screens aand washer/compactors for the three Okanagan WWTPs and review lessons learned relating to volume of screenings generated and other characteristics; compare features of different manufacturers; compare equipment configuration for each facility; performance of washer/compactors; and, continuous or intermittent operation of fine screens.

Authors: Nemeth, Les

Subjects: Wastewater

Tags:WWTP,sewage,fine screens,ac2012

Citation:2012 BCWWA Annual Conference, Session 8, Penticton

Publication Date:Aug 7th, 2012 Upload Date:Aug 7th, 2012

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