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194 N.K. Shammas and L.K. Wang
Fig. 4.8. Schematic of challenge testing facility (Source: ref. (37)).
operators accomplished all repairs to the CBUDSF system with readily available tools. For many
of the repairs to the MF unit, factory-trained technicians were needed.
14. Results of the increased solids loading test indicate that both systems are capable of processing
high solids source water with modified operational protocol (e.g., increased coagulant, chlorine
turnover rate for CBIJDSF and increased backwash frequency for MF). The MF unit outperformed
the CBUDSF unit during the tests; however, both units produced filtrate in compliance
with existing regulatory standards for potable water (e.g., consistent effluent turbidities less
than 0.1 NTU) throughout the test.
15. Both systems performed well as tertiary filtration units and in such a way as to confirm that both
units are in compliance with the NYC Watershed Rules and Regulations.
Muhammad et al. (40) evaluated various surrogates for Cryptosporidium removal. The
results are useful for future pilot plant challenge testing.