Post on 01-Jan-2021
transcript
C&D Waste as a resource Applying circular economy principles to the construction sector
WasteMINZ Conference 2019
26th September 2019
Chris Purchas & Anna Ainsworth
Contents
• Context
• Our approach
• Drivers
• Issues and opportunities
• Overview
Context
• Construction and demolition (C&D) waste is a challenge across New Zealand
• Lack of good data nationally for C&D waste
• Data suggests a high proportion of landfilled waste is C&D
Context continued...
Wellington region – est. 570,000 TPA of C&D waste sent to landfill
Auckland – est. 500-600,000TPA sent to landfill
(ECNZ, AC Programme Director)
Represents est. 50% of all waste generated in NZ
Est 20% of all waste to landfill
Est 80% of all waste to managed fills and cleanfill(REBRI)
Our approach
Where are we now?
• Current approach to managing C&D waste
• Estimated materials quantity and characteristics
What does the future look like?
• Projected future quantity of materials
• Likely materials characteristics
What could we do
differently?
• Understand and address data gaps
• Chase opportunities
• Address challenges and issues
What are we talking about here?
• Buildings
• A hierarchy of optionso Reuse (on site or re-locate)
o Recover components
o Recovery materials
o Recover for energy or other ‘lower value use
What are the drivers for ‘diverters’
• Cost
• Timeline
• Reputation/Community expectation
• Health & Safety
• Jobs
What are the drivers for ‘reusers’
• Cost
• Aesthetics
• Standards/performance
• Reputation (e.g. Greenstar, ISCA)
Issues and opportunities
• Mindset
• Capability for processing materials
• Capacity to process materials
• Local solutions
• Building an ecosystem …
Mindset
• Lowest cost vs. maximum value
• Managing risk vs. taking opportunitieso Building product standards
o Conventional vs innovative products
• Public sector procurement
• Invite entrepreneurs
Capability and capacity
• Capability – the ability to deliver
o The right skills
o The right people
o The equipment to safely and effectively delivery services
• Capacity – to manage the quantity of materials
o The right number of people, plant and equipment
o Space for processing and storage
Local solutions
• Disposal
o Location
o Standards
• Materialso Local availability e.g. quarry locations, material re-processors
o Local regulators/specifiers e.g. road base materials
Creating an ecosystem
• Everyone has a role to play
Creating an ecosystem
• Everyone has a role to play
• A break can occur anywhere
Creating an ecosystem
• Everyone has a role to play
• A break can occur anywhere
• Integrated approacho Mindset
o Capability and capacity
o Local solutions
Case study – Piritahi
• 7,000: 1950 – 80’s homes to 25,000 modern homes
• 5 precincts across Aucklando Mt Roskill, Oranga, Mangere,
Northcote
• (Commercial) alliance to clear properties for home constructiono Commercial vs social and broader economic outcomes
o Timeline pressures
o Market risk
Dumpster diving at scale
Case study – Commercial building
• Earthquake damageo Insurance
o Risk of entry (H&S)
• Future commercial developmento Cost
o Timeline
Integrated approach – our ideas
• Share stories, knowledge and lessons learnt
• Build capability and capacityo Leverage public sector projects.
o Make use of public assets (space)
• Circular from the ground up – procurement, design, construction, …
• Get the framework righto Bylaws (data, project requirements)
o Building Regulation – appropriate use of recovered materials
o Disposal and processing – appropriate controls including monitoring and enforcement