Urban Ecology_Waste Systems_City of Sydney

Sydney, Australia

Climate Zone:
Warm Temperate Zone

Background of Case Study:
In 2007, the City of Sydney asked its residents and businesses what they wanted to see happen over the next 20 years and beyond. The result is a collective vision for Sydney’s future development called Sustainable Sydney 2030, which will make Sydney a green, global and connected city. The City is fast becoming a leading environmental performer and our sustainability plan guides what we do – sustainable development is not just about the physical environment but it is also about fostering Sydney’s economy, society and culture into their plans. The City of Sydney’s vision for 2030 is a sustainable City delivering global best practice services for its residents and businesses.

Year of Implementation: 
In 2008 the City of Sydney launched Sustainable Sydney 2030 and committed Sydney to becoming a green, global and connected city. The City increased its resource recovery rate from the domestic waste we collect from 27% to 66% between 2006 and 2011/12, two years ahead of the statewide target set by the NSW Government. Its focus is on separating valuable recyclables, composting the organic fraction, with the remaining 34% of the waste stream going to landfill.

Type of System:
The Advanced Waste Treatment Master Plan is a system that the city has adopted for its waste management. The plan sets out the options for the City of Sydney to improve the long term sustainability of its waste management needs, While providing a renewable energy recovery solution integrated with the targets of the Renewable Energy and Trigeneration Master Plans.

Urban Ecology Waste Systems_Abhishek Ashely_10062015
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Type of Waste Treated:
Organic Waste, Recycling, Commercial waste, E-waste and Chemical Waste.

Other Benefits apart from Waste Management:

Creating energy from waste
The advanced waste treatment master plan will deliver ‘energy from waste’ for Sydney by:

1) Recovering both material and energy resources from waste with virtually no waste going to landfill
2) Converting non-recyclable waste to renewable and non-fossil fuel gases
3) Converting renewable and non-fossil fuel gases into substitute natural gas for injection into the gas grid for lower carbon energy delivery, including supply of the City’s planned trigeneration network.

The City has influenced the community to eliminate unnecessary waste. Marketing and education programs that help people understand and use the systems available to them are an effective long-term approach to achieving sustainable waste outcomes. Educational programs are developed which prevent waste being created and continues to develop programs that can help reduce waste at its source.

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Necessary Policies:

Commercial waste collection time zones:
The two (2) time zones for collection of commercial waste are: Open collection zone:
24-hour collection access (everyday)
Limited collection zone: 6.00am – 10.00pm (Monday to Friday)
8.00am – 10.00pm (weekends and public holidays)
Most main and arterial roads in the city are open collection zones, meaning waste may be collected any day, at any time of the day or night.
All CBD streets are open collection zones except for residential streets in Dawes Point and Millers Point. See the Commercial Collection Time Zones Map for street-specific information.
Other City streets are limited collection zones. This means that waste may only be collected between 6.00am and 10.00pm weekdays, and 8.00am and 10.00pm on weekends and public holidays throughout most of the local government area.

Domestic waste collection time zones:
The two (2) time zones for collection of domestic waste are: Main and arterial roads zone:
5.30am – 10.00pm everyday Residential roads zone:
6.00am – 10.00pm Monday to Saturday
8.00am – 10.00pm Sundays
Domestic collection time zones refer to the collection of domestic waste by the City or agents acting on its behalf. They relate to the street on which the bin is put out for collection, not the street address of the premises. A map in this appendix shows the domestic collection time zones. On public holidays domestic collection times may vary in response to changes in waste disposal collection time zones at facility operating hours. The City reserves the right to alter the street boundaries and terms of the any time. The City will make reasonable attempts to notify all parties deemed to be affected by such changes.

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The City

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Case Study System Comparison:

$14-$21 million USD (based on a 40 tonnes per day TwinRec facility)

System Description:
Although the actual facility for this master plan has not yet been constructed they have listed several case studies that they have based their projections on. For the purposes of this case study the focus will be on Ebara TwinRec Process in Aomori Japan. This specific gasification process was developed by the Ebara Corporation in 2001 to manage commercial, municipal and industrial waste. This process begins in the first chamber that surrounds the organic biomass with oxygen rich gas at high heat and pressure, sucking in fluidizing air and releasing ash. From here, the synthesized gas produced is burnt at a very high temperature in a secondary chamber and releases vitrified ash that can be used as slag. The methane gas produced goes through a series of filters that receives and odorant for human detection in case of a leakage and a release water of water. From here we get a very pure and potent form of energy that can be used for industrial processes and power generation. This process has the benefit of a compact design, easily controlled process and limited air requirements.

system diagrams-01
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System Diagram:
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System Diagram:
system diagrams-03
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