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Pilot studies were conducted to investigate the effect of recycling spent filterbackwash water (SFBW) on Cryptosporidium and particle removal during conventionalsedimentation and dual-media filtration. When SFBW recycle configurations(3,000-19,000 oocysts/100 L) were used, Cryptosporidium concentrations in settledwater were as low as or lower than when no recycle was used (6,000-22,000oocysts/100 L). Filtered water oocyst concentrations were typically below thedetection limit of 1 oocyst/120 gal (~0.25/100 L). Overall process removal wasabout 5 log without recycle and about 5.7 log for each recycle scenario based oncalculations using raw Cryptosporidium concentrations and filtered waterdetection levels. As with Cryptosporidium removal, removal of turbidity andparticles

Product Details

Edition: Vol. 93 - No. 4 Published: 04/01/2001 Number of Pages: 10 File Size: 1 file , 330 KB