Gympie Sewage Treatment and Processing Plant

Topics: Sewage treatment, Anaerobic digestion, Environmental engineering Pages: 27 (5909 words) Published: March 29, 2013


Title page

Contents pages

1.0 Project introduction and background

2.0 Project approvals required

3.0 Site location

4.0 Site geology

5.0 Project description of old system

5.1 Inlet

5.2 Three clarifiers

5.3 Digesters

5.4 Sludge bags

5.5 Three trickle filters

5.6 Settling lagoon

6.0 Additions and conversions

7.0 Project description of new system

7.1 Inlet

7.2 Storage tanks

7.3 Bioreactor

7.4 Two clarifiers

7.5 RAS pump station

7.6 Aerobic digester

7.7 Sludge press

7.8 Three sand filters

7.9 Chlorine holding tanks

7.10 Settling lagoon

8.0 Materials used on site and their sources

8.1 Concrete

8.2 Steel

8.3 Chlorine

8.4 PP and PVC (pipes, valves)

8.5 Filter bed material (rocks, gravel, sand)

8.6 Pumps and compressors

9.0 Construction methods used

9.1 Excavation and landscaping earthworks

9.2 Formwork and scaffolding

9.3 Steel reinforcement

9.4 Drilling and blasting

9.5 Piling

9.6 Hoisting and fitting

10.0 Plant used

10.1 Shovel bucket

10.2 Backhoe

10.3 Grader

10.4 Tamping foot roller

10.5 Truck

10.6 Crane

11.0 Management structure of the project

11.1 Preliminary investigation and final project definition

11.2 Planning and design

11.3 Contracting, construction and operation

12.0 Safety, environmental and traffic management

12.1 Safety management

12.2 Environmental management

12.3 Traffic management

13.0 Particular points of interest

14.0 Particular problems encountered on the project

15.0 Conclusions

16.0 References

Appendix 1 (a, b)

Appendix 2 (a–x)

1.0 Project introduction and background

The Gympie Sewage Treatment and Processing Plant project began in 2008 and is due to finish in June 2011. It is designed to process sewage from all of Gympie and nearby surrounding areas. Essentially, the project is an upgrade to new system from an existing inferior old system. The cost of old system’s construction was $15 million, and the upgrade cost is estimated as $22 million. The old system was built in 1964 when Gympie’s population was 12 000, and the system was capable of processing wastewater produced by 15 000 EP (equivalent persons). The population of Gympie in the year 2000 was only 15 400 and in 2005 was 18 700 but increased to 21 000 in 2008 and therefore a decision was made to upgrade. In 2008, 6 ML/day (megalitres per day) of ‘Class D–’ sewage effluent was being released into the Mary River, the main river in Gympie. The sewage only underwent minor chlorine treatment, sludge was filtered out, and remaining liquid was discharged into the river.

There were unpleasant odours for nearby areas, large quantities of harmful nitrogen, compounds phosphorous compounds and BOD (biological oxygen demand) emissions, polluting the water and making it unsuitable for fish life, marine habitats, or any human contact in nearby concentrated areas. Some workers received infections from handling the effluent just before its discharge into the river.

The effluent was unapproved by the Queensland EPA (Environmental Protection Authority) and DERM (Department of Environment and Resource Management) to be released into river. Thus a new system was devised with better, multiple treatments and filtering to produce Class A (certified by EPA) effluent, of which only 4.5 ML would be discharged into Mary River, 0.7 ML would be irrigated around the site and the remaining 0.8 ML would be channelled to golf courses, sports landscapes and tree plantations.

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