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Ref. No. [UMCES] CBL 11-037
2
Trial #2
– 3 sampling periods; high pressure 30 psi, 211 m
3
/h flow; first back flush after 45
minutes from start time, additional back flushes approximately every 30 minutes over a 1h and
45min testing series; differential pressure ranged between 0.11 and 0.9 psi
Trial #3
– 3 sampling periods; high pressure 30 psi, 211 m
3
/h flow, 5 back flushes – two after
Sample 1, one after and one during Sample 2, and one after Sample 3; differential pressure
ranged between 0.11 and 0.9 psi
Trial #4
– 6 sampling periods, high pressure 22 psi, 211 m
3
/h flow for first three samples;
changed to 29 psi at 216 m
3
/h for remaining samples, 5 back flushes total – first back flush prior
to Sample 3, four back flushes after Sample 3, 4, 5 and 6; differential pressure of 0.5 psi
Trial #5
– 6 sampling periods, Sample 1: 29 psi, 200 m
3
/h flow; Sample 2: 27 psi, 256 m
3
/h
flow; Sample 3: 22.5 psi, 210 m
3
/h flow; (Filter change prior to Sample 4) Sample 4: 22.9 psi,
200 m
3
/h flow; Sample 5: 29 psi, 200 m
3
/h flow; Sample 6: 29 psi, 265 m
3
/h flow; 9 back flushes
total – 1 prior to start, one each after Samples 1, 2, 3, 4, 5, and 6, two back flushes after filter
change; differential pressure of 0.2 psi
Trial #6
– First three sampling periods at high pressure 22 psi, 200 m
3
/h flow at 1400 filter
differential pressure; remaining three sampling periods at high pressure 29 psi, 200 m
3
/h flow at
1650 filter differential pressure; four back flushes after Sample 2 and one back flush after
Sample 5
4.0. Trial Results
4.1. Water Quality – Physical Parameters
The parameters below were measured in the ambient water using a YSI 556 multi-
parameter instrument.
Trial Number
Date
Temp (C°)
Salinity
DO (mg/l)
pH
Hydac-1
25 Jan 2011
1.5
15.1
14.3
7.4
Hydac-2
31 Jan 2011
1.5
13.5
16.6
6.9
Hydac-3
2 Feb 2011
1.3
11.4
N/A
6.9
Hydac-4
24 May 2011
21.2
1.9
7.9
N/A
Hydac-5
25 May 2011
22.4
1.8
8.7
N/A
Hydac-6
26 May 2011
23.8
1.7
9.1
N/A
4.2. Water Quality - Total Suspended Solids
The TSS samples for Hydac trials 1, 2, and 3 were collected after the Hydac filter for
every major sample time point (T0, T1 and T2) in triplicate in order to obtain high-resolution
TSS data. Back pressure and flow remained constant. Hydac trials 4, 5, and 6 focused on
varying the pressure, flow and filter changes, sometimes between each time point; therefore, the
sample regime changed to one ambient and one post filter sample per time point (with a total of 5
time points per trial).