Part Response to Information Request (Odour Modelling) - MCU21/0110 - Email 1 of 2

              Issue                            Information required                                            Katestone Recommended Response
                                      14. Provide further justification for not    Section 6 of the air quality assessment describes the reasoning. That is, odour emissions
                                      including odour emissions from the inlet     from the inlet works were not included as odours were not detected a short distance from the
                                      works in the assessment.                     source. This observation is consistent with the fact that the inlet works is enclosed to facilitate
                                                                                   capture of odours and treatment via a biofilter.
                                                                                   Odour emissions from the biofilter were measured and included in the dispersion modelling
                                                                                   study.
The odour emission rates adopted      15. Describe the dispersion parameters       Characterisation of the sludge loadout sources is provided in the table below.
for the assessment identify that      and representation of the sludge             Sludge loadout was assumed to occur at 5am in the morning based on operational advice
sludge has a high emission            emission source in the modelling to          from the Noosa Waste Water Treatment Plant.
potential but was not sampled at      validate the predictions undertaken for       Source Type                        Effective   Initial horizontal spread   Initial vertical spread
the plant.                            this source.                                                                     height
                                                                                                                           m                  m                            m
                                                                                    Transfer from conveyor to hopper       4                  2                            1
                                                                                    Hopper                                 4                  8                            1
                                                                                    Drying belt                            4                                               1
                                      16. Provide justification as to why the      Odour sampling was undertaken on 13 December 2017. Standard operations were occurring
                                      odour sampling undertaken for the            at the Noosa Waste Water Treatment Plant at the time of sampling. The Noosa WWTP has a
                                      purpose of the reporting is relevant to      biofilter which minimises emissions and makes them more consistent. The only activity that
                                      odour emissions at all times. Is the odour   was not occurring was the sludge loadout due to the time of the day and, therefore, emissions
                                      emission sampling representative of          for this source were obtained from the literature.
                                      worst case emissions?                        Emissions from the sampling have been compared to those reported in the Sydney Water
                                                                                   Database for WWTPs. A summary is provided below. The emissions from Noosa WWTP are
                                                                                   of the same magnitude or greater than the literature.
                                                                                                                  Sydney Water Database
                                                                                                                                                               Noosa WWTP
                                                                                    Source                   Average               Maximum
                                                                                                                                                                 (ou/m2/s)
                                                                                                             (ou/m2/s)             (ou/m2/s)
                                                                                                                                                               16.8 (anaerobic)
                                                                                    Bioreactor                 0.77                        4.7                   2.6 (anoxic)
                                                                                                                                                                1.3 (aerobic)
                                                                                    Digester                   0.20                        1.0                        1.2
                                                                                    Clarifier                  0.12                        1.1                        5.4
                                                                                    Sludge
                                                                                                                17                          22                        17
                                                                                    loadout



Katestone Environmental Pty Ltd                                                                                                                                        23 August 2021
GH Australia – D21030-1-1 - Noosa Springs Boutique Hotel                                                                                                                      Page 4


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Issue Information required Katestone Recommended Response
14. Provide further justification for not | Section 6 of the air quality assessment describes the reasoning. That is, odour emissions
including odour emissions from the inlet | from the inlet works were not included as odours were not detected a short distance from the
works in the assessment. source. This observation is consistent with the fact that the inlet works is enclosed to facilitate
capture of odours and treatment via a biofilter.
Odour emissions from the biofilter were measured and included in the dispersion modelling
study.
The odour emission rates adopted | 15. Describe the dispersion parameters | Characterisation of the sludge loadout sources is provided in the table below.
for the assessment identify that and representation of the sludge | Sludge loadout was assumed to occur at 5am in the morning based on operational advice
sludge has a high emission | emission source in the modelling to | from the Noosa Waste Water Treatment Plant.
potential but was not sampled at | validate the predictions undertaken for | | Source Type Effective | Initial horizontal spread | Initial vertical spread
the plant. this source. height
m m m
Transfer from conveyor to hopper 4 2 1
Hopper 4 8 1
Drying belt 4 1
16. Provide justification as to why the | Odour sampling was undertaken on 13 December 2017. Standard operations were occurring
odour sampling undertaken for the | at the Noosa Waste Water Treatment Plant at the time of sampling. The Noosa WWTP has a
purpose of the reporting is relevant to | biofilter which minimises emissions and makes them more consistent. The only activity that
odour emissions at all times. Is the odour | was not occurring was the sludge loadout due to the time of the day and, therefore, emissions
emission sampling representative of | for this source were obtained from the literature.
worst case emissions? Emissions from the sampling have been compared to those reported in the Sydney Water
Database for WWTPs. A summary is provided below. The emissions from Noosa WWTP are
of the same magnitude or greater than the literature.
Sydney Water Database Noosa WWTP
Source Average Maximum (ou/m2/s)
(ou/m?/s) (ou/m?/s)
16.8 (anaerobic)
Bioreactor 0.77 4.7 2.6 (anoxic)
1.3 (aerobic)
Digester 0.20 1.0 1.2
Clarifier 0.12 141 5.4
Sludge
ioadout 7 22 7
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