Page 2071 - Week 06 - Thursday, 9 June 2022
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Table 1: Median H2S values in parts per million (ppm)
|
Period |
West Mac 1 |
West Mac 2 |
West Mac 3 |
All sites |
|
2011 |
0.17 |
0.12 |
0.26 |
0.17 |
|
2012 |
0.14 |
0.04 |
0.00 |
0.06 |
|
2013 |
0.22 |
0.00 |
0.04 |
0.05 |
|
2014 |
0.04 |
0.00 |
0.04 |
0.03 |
|
2015 |
0.12 |
0.02 |
0.00 |
0.04 |
|
2016 |
0.13 |
0.00 |
0.00 |
0.00 |
|
2017 |
0.24 |
0.04 |
0.02 |
0.08 |
|
2018 |
0.19 |
0.04 |
0.04 |
0.06 |
|
2019 |
0.27 |
0.00 |
0.02 |
0.05 |
|
2020 |
0.20 |
0.00 |
0.01 |
0.04 |
|
2021 |
0.32 |
0.01 |
0.00 |
0.03 |
|
2022 |
0.18 |
0.03 |
0.00 |
0.02 |
|
2011 to 2022 |
0.18 |
0.01 |
0.01 |
0.05 |
9. The basis for replacement of filter media is determined by a unit’s performance. Measuring gas concentration indicates the proportion of odourous gas removed as the gases pass through the media (media refers to the carbon filter which removes odour). When the media reaches a saturation point, removal effectiveness declines, and the media is replaced.
There are three units in the area. Since 2011, the carbon filters have been changed nine times at one of the units (due to it taking the majority of load) and two times for the second unit. The third unit has not been changed as it has not reached its saturation point due to very low H2S inflow.
Belconnen trunk sewer upgrade—odour control units
(Question No 786)
Mrs Kikkert asked the Chief Minister, upon notice, on 6 May 2022 (redirected to the Treasurer):
(1) On what basis was it determined that the ventilation stacks, for the new odour control units (OCUs) associated with the Belconnen Trunk Sewer Upgrade, should be 14 metres in height.
(2) What is the maximum possible height for an OCU’s ventilation stack.
(3) Is it possible that the ventilation stacks for the planned OCUs could be raised if necessary.
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