MERC ER01-14
4
chlorophyll (Chl). These analyses were carried out on representative samples collected from
challenge water (upstream of the Filtrex system) and treated water (down stream of the Filtrex
system). A hand-held multiparameter instrument measured temperature, salinity, and dissolved
oxygen in the challenge (pre-filter) and treated (post-filter) water overflow drums at three time-
points during each trial: beginning, middle and end. At the completion of each trial, the MERC
piping system was immediately flushed with fresh municipal water. See MERC SOPs for
additional details concerning operations and sampling.
4.3. Hydraulic tests
During the tests, Filtrex conducted independent hydraulic tests to add technological
supporting data and study filter performance. A Filtrex engineer monitored the following
parameters: instantaneous flow rate, daily accumulated flow, delta pressure on the filter, and
number of back washes per working day.
5. Summary of Results
Note: key performance data is provided in sections 5 - 9. All raw data and complete datasets
from this evaluation, including operational data, are available upon request.
MERC conducted seven land-based trials of the Filtrex ACB filtration system, under
various conditions, during the fall of 2013 (Table 1). This performance evaluation was based on
physical and biological characterization of challenge (pre-filter) water versus treated (post filter)
water for two IMO D-2 and USCG regulated biological efficacy categories: ≥50 µm and ≥10 -
<50 µm (Table 2). During the natural (NTL) water trials,
in situ
TSS and POC concentrations
were not manipulated. During the augmented (AUG) trials, the target TSS concentration was ~
50 mg/L and the target POC concentration was >5 mg/L. The augmentation trial for FXIT-30.1
µm was canceled due to inclement weather. A Filtrex 10 µm filter was also hydraulically tested;
however, no biological efficacy trials were performed.
Table 1. Trial Summary
Trial ID
Trial Date
Filter Type
Water Type
FXIT-30-NTL 5 Nov 2013
Filtrex 30 µm filter
Natural
FXIT-30-AUG 7 Nov 2013
Filtrex 30 µm filter
Augmented
FXIT-20-NTL 13 Nov 2013 Filtrex 20 µm filter
Natural
FXIT-20-AUG 14 Nov 2013 Filtrex 20 µm filter
Augmented
FXIT-06-NTL 18 Nov 2013 Filtrex 6 µm filter
Natural
FXIT-06-AUG 20 Nov 2013 Filtrex 6 µm filter
Augmented
FXIT-30.1-NTL 9 Dec 2013
Filtrex 30 µm filter
Natural
