Upload
others
View
19
Download
0
Embed Size (px)
Citation preview
YEPPOON
SEWAGE TREATMENT PLANT
AUGMENTATION
PROJECT BACKGROUND
Yeppoon STP Location
Sludge
Dewatering
Blowers
Original BNR Plant
• Existing Yeppoon Sewage Treatment Plant (YSTP) was commissioned in 2006
• Biological Nutrient Removal (BNR) plant designed to treat flow of 21,000 equivalent persons (EP)
• Treated effluent reused for irrigation or discharged to Corduroy Ck
• Waste sludge was dewatered and disposed of at landfill at significant cost
• Plant had performed well to date
Project Background
• Plant Audit and Augmentation Options studies done in 2015 and 2016
• Capacity increased from 21,000 EP to 31,000 EP
• Will accommodate population growth for ~10 years
• Augmentation involved conversion to MBR plant
• Utilises latest membrane technology
• Improved effluent quality (Class A) produced
Augmentation Overview
PROJECT SCOPE
New Inlet Works
New Odour Control Facility
Bioreactor Refurbishment
Membrane Feed Pumping
New Membrane Filtration
New Membrane Filtration
New Chemical Dosing System
Centrifuge
ENGINEERING & DESIGN
Downer MBR ProcessYeppoon STP is Downer’s 21st MBR Process Plant
• Downer has a proven track record of successful delivering 23 MBR process plants over the past 15 years
• First plant constructed in 2005 (Victor Harbor STP)
• Avg Flows between 0.18 – 18.6 ML/day
• Peak Flows between 0.2 – 95 ML/day
Design ParametersParameter ValueInitial Daily Inflow 4 ML/d
46 L/sDesign Average Dry Weather Flow (31,000EP) 6.2 ML/d
71.8 L/sDesign Peak Full Treatment Flow (3 x ADWF) 18.6 ML/d
216 L/sUltimate PFTF 292 L/sMaximum Design MBR net outflow – three trains (12 membrane modules)
256 L/s
Maximum Design MBR net outflow – Ultimate four trains online (4.6 x ADWF)
332 L/s
• MBR design caters well for plants with high rainfall through the addition of more membrane modules.
Design Parameters
• The design was typical domestic wastewater with the provision of septage loading
Parameter Raw Sewage 50%ile Design Load
Raw Sewage 90%ile Design Load
Maximum Septage Load
COD (kg/d) 3,653 4,932 170BOD (kg/d) 1,588 2,144 26.5TSS (kg/d) 1,827 2,467 157VSS (kg/d) 1,553 2,097 103TKN (kg/d) 364 492 14.3Ammonia (kg/d) 291 393 6.4Total P (kg/d) 61 83 3.6Oil and Grease (kg/d) 372 502 3.5
Process Flow Diagram
•
3D Modelling
•
Final Plant
Planning for Staged Construction
Value in DesignDowner provided a number of key features that added value for Livingstone Shire Council
• Stage 2 upgrade (in 10+ years time) could require an additional bioreactor –Downer provided a connection point on the outlet of the inlet works
• Additional screening capacity provided via ‘oversized’ fine screens
• The membrane tanks were fitted with 3 trains and a fourth spare for a future upgrade
Reduction in Plant Footprint
DELIVERY
Engaging the Local Supply Chain• 6 local delivery partners chosen to perform the main elements of the
project
Contractor Scope
JRT Civil Civil Works
BME Mechanical and piping Installation
NRG Industrial Electrical – Supply & Installation
Intallect
CQ Steel Structural Steel – Supply & Installation
Form2bSure Concrete Structures
Works Staging – integration with existing plantNew facilities integrated into the existing plant in staged process
Stage 1: Enabling Works:
• Demolition & temporary works
Stage 2: New Inlet Works
• New Inlet Works commissioned & cut over
Stage 3: Bioreactor 1 Offline
• Plant operates with new Inlet Works and only 1 Bioreactor while Bioreactor 1 is refurbished
Stage 4: Bioreactor 2 Offline
• Plant operates with new Inlet Works and only 1 Bioreactor while Bioreactor 2 is refurbished
Works Staging – integration with existing plantNew facilities integrated into the existing plant in staged process
Stage 5: MBR Online:
• New MBR process integrated, existing clarifiers & tertiary filters decommissioned
Stage 6: Bioreactor 2 Online
• Refurbishment of Bioreactor 2 complete, plant now operating with new inlet works, MBR, and both bioreactors
Stage 7: Dewatering, Odour Control System and Final Works
• New dewatering system commissioned & cut over
• New Odour control system operational
QLD Building & Construction Training
LSC were successful in securing $5 M funding from Building Our Regions (BOR) State funding program.
Training Hours Achieved:
• Over 4800 hours for workforce apprentices/trainees
How this was Achieved:
• Engagement of local workforce with focus on providing upskilling opportunities
• Tenderers evaluated on their commitment to providing employment to apprentices/trainees for duration of the project
PERFORMANCE
Plant Performance
The final plant performance was assessed against:
• Effluent Quality
• Power Consumption
• Chemical Consumption
• Biosolids Generated
• Operability
Improved Recycled Water Quality
Effluent quality:
• Total Nitrogen <1.5 mg/L
• Total Phosphorus <1 mg/L
• Reliable bacterial results (<2 CFU/100mL)
• Turbidity <1 NTU
Operating CostsNo increase in specific power consumption Reduced Chemical
Biosolids Disposal Costs
Reduced due to increased dryness
• 22%w/w dry solids achieved with decanter centrifuge using membrane pre-thickening of WAS
KEY ACHIEVEMENTS
Key Achievements
• Successful delivery of the treatment plant upgrade on time and on budget
• Successfully integrated the new treatment plant into the existing treatment plant process, without incident
• Improved sustainability and optimised plant operation
• Supporting the community through buying local
• Contributing to the construction industry through training of apprentices