Ackumen™ MCA-i™ The safer, smarter monochloramine offering - Paper Technology International 2023 Buckman - Paper Technology International 2023 - Flipbook - Page 49

Ackumen™ MCA-i™ The safer, smarter monochloramine offering - Paper Technology International 2023 Buckman

PAPERTECHNOLOGYINTERNATIONAL Ackumen™ MCA-i™ The safer, smarter monochloramine offering - Paper Technology International 2023 Buckman
Figure 3: Phase 1 Trial Evaluation of Microbial Control via ATP
Analysis. With the Gen 4 unit, ATP numbers were well below the
customer’s upper limit of 500 rlu. MCA-i produced similar results.
The three outliers (encircled) occurred after an unplanned down
and correlate to slightly lower MCA headbox residuals during the
same time period (Figure 1).
Figure 4: Phase 2 Trial Conversion Evaluation of Headbox MCA
Residual. The headbox residuals were maintained during the
conversion.
Figure 5: Phase 2 Trial Conversion Evaluation of MCAP and Sodium Hypochlorite Dosage Rates. Both chemical dosage rates were
reduced further while the MCA headbox residuals noted in the trial phase were maintained (Figure 4).
Phase 2 – Trial Conversion
For phase 2, the biocide program was further optimized
utilizing MCA-i’s features. Results are shown above in Figures 3-4.
The MCA headbox residuals were maintained at 1.7 ppm (Figure
4) while the flow rates of both MCAP and sodium hypochlorite were
further reduced (Figure 5).
The speed of response with MCA-i provided a more
consistent biocide dosing, less variation in monochloramine residual
and reduced variability throughout the process, resulting in a higher
level of efficacy and a reduction in chemical usage. Features of the
MCA-i unit that contributed to these results include the hypochlorite
sensor and the use of PID (proportional–integral–derivative) flow
control valves. In the past, the sodium hypochlorite activity was
tested manually and then the MCAP : sodium hypochlorite molar
ratio was also adjusted manually. Because the sodium hypochlorite
activity was monitored continuously, MCA-i was able to automatically
adjust the MCAP : sodium hypochlorite ratio to the proper molar
ratio. Figure 6 shows an example of the change in sodium
hypochlorite activity over a 24-hour period. As a new delivery was
transferred to the run tank, the sodium hypochlorite concentration
increased from 8.5% to 12.5%. MCA-i automatically adjusted the
chemical ratios to continue to produce a stable MCA solution. This
ensured that the sodium hypochlorite was not being overfed, which
would have led to the formation of dichloramines. The addition of
PID flow control valves eliminated drifts which can occur with the
use of manual flow valves. A comparison of the water booster pump
variation over a 12-hour period between the Gen 4 unit and MCA-i
is shown in Figure 7. With the PID flow control valves in MCA-i, the
flow variation was reduced by 75%. This translates to having the
right amount of MCA chemistry in the process at the right time.
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