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CO-COLLECTION OF DOMESTIC FOOD WASTE AND GARDEN ORGANICS; what’s it going to cost?

CO-COLLECTION OF DOMESTIC FOOD WASTE AND GARDEN ORGANICS; what’s it going to cost?. Waste Pathways: Outlook 2007 23 March 2007. John Comrie. CO-COLLECTION OF DOMESTIC FOOD WASTE AND GARDEN ORGANICS. ZWSA commissioned preparation of business case to raise awareness

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CO-COLLECTION OF DOMESTIC FOOD WASTE AND GARDEN ORGANICS; what’s it going to cost?

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  1. CO-COLLECTION OF DOMESTIC FOOD WASTE AND GARDEN ORGANICS; what’s it going to cost? Waste Pathways: Outlook 2007 23 March 2007 John Comrie

  2. CO-COLLECTION OF DOMESTIC FOOD WASTE AND GARDEN ORGANICS • ZWSA commissioned preparation of business case to raise awareness • engaged JAC Comrie Pty Ltd in conjunction with TJH Management Services Pty Ltd (T Hockley) and Sustainable Outcomes ( T Bruun) • report not yet finalised - views expressed are consultants’, not ZWSA’s, and preliminary

  3. CO-COLLECTION OF DOMESTIC FOOD WASTE AND GARDEN ORGANICS • based on latest ZWSA audit, 3 bin system with fortnightly collection of garden organics achieves highest landfill diversion • typically currently recovers and therefore avoids disposing to landfill approximately 55% of material presented for collection

  4. CO-COLLECTION OF DOMESTIC FOOD WASTE AND GARDEN ORGANICS Modest further improvements in landfill diversion could be achieved by: • greater educational focus on recycling • encouraging all councils to provide a three bin system • encouraging all councils to collect green organics fortnightly

  5. CO-COLLECTION OF DOMESTIC FOOD WASTE AND GARDEN ORGANICS • food waste represents biggest opportunity to achieve significant additional diversion from landfill of domestic waste • co-collection of food waste with green organics can be readily accommodated in technical sense with existing green organics collection systems

  6. CO-COLLECTION OF DOMESTIC FOOD WASTE AND GARDEN ORGANICS Burnside experience & elsewhere in Aust evaluated, in particular regarding • container • corn starch bags • frequency of collection • open windrow composting Concluded Burnside model well worth pursuing

  7. CO-COLLECTION OF DOMESTIC FOOD WASTE AND GARDEN ORGANICS Different councils: • have some differences in actual costs (operating conditions) • measure costs differently (eg cost of capital and treatment of overheads)

  8. CO-COLLECTION OF DOMESTIC FOOD WASTE AND GARDEN ORGANICS • study based on marginal costs and recognises capital has a real (net of inflation) cost • recognises need for fortnightly green organics collection service

  9. ADDITIONAL COST IF HAVE EXISTING FORTNIGHTLY GREEN ORGANICS • bio bin $0.77 • corn starch bags $10.50 • processing green + kitchen waste $5.98 • promotion and advertising $2.50 • avoided landfill cost (Direct): ($3.44) • Total Cost per hh pa $16.31

  10. ADDITIONAL COST IF HAVE EXISTING FORTNIGHTLY GREEN ORGANICS • bio bin $0.77 • corn starch bags $10.50 • processing green + kitchen waste $5.98 • promotion and advertising $2.50 • avoided landfill cost (WTS): ($4.56) • Total Cost per hh pa $15.19 • diversion increases to approx 66%

  11. ADDITIONAL COST IF HAVE EXISTING FORTNIGHTLY GREEN ORGANICS • generic bin <$0.77 • NO corn starch bags • processing green + kitchen waste $4.94 • promotion and advertising $2.50 • avoided landfill cost (Direct): ($2.29) • Total Cost per hh pa <$5.92 • amenity & food waste diversion reduces

  12. ADDITIONAL COST IF HAVE EXISTING FORTNIGHTLY GREEN ORGANICS • generic bin <$0.77 • NO corn starch bags • processing green + kitchen waste $4.94 • promotion and advertising $2.50 • avoided landfill cost (WTS): ($3.04) • Total Cost per hh pa <$5.17 • amenity & food waste diversion reduces

  13. ADDITIONAL COST IF HAVE EXISTING FOUR WEEKLY GREEN ORGANICS • Cost as per first scenario $15.19 – $16.31 • Additional GO collections $10.14 • Total Cost per hh pa $25.33 - $26.45 • green organics diversion increases

  14. ADDITIONAL COST IF NO CURRENT GREEN ORGANICS SERVICE • Cost as per first scenario $15.19 – $16.31 • Introduce GO collections $33.02 • Total Cost per hh pa $48.21 - $49.33 • green organics diversion increases

  15. COST IF HAVE EXISTING FORTNIGHTLY GREEN ORGANICS AND SWITCH TO FORTNIGHTLY RESIDUAL WASTE • bio bin $0.77 • corn starch bags $10.50 • process green + kitchen waste $7.02 • promotion and advertising $2.50 • avoided landfill cost ($8.03) – ($10.65) • Collection savings ($14.30) • Total Savings per hh pa ($1.54) – ($4.16) • diversion increases to approx 77%

  16. FORTNIGHTLY GREEN ORGANICS AND SWITCH TO FORTNIGHTLY RESIDUAL WASTE • not suitable for split-bin system (recyclables exceed available capacity) • further increases diversion of food waste and other recyclables from landfill

  17. COST IF HAVE EXISTING FORTNIGHTLY GREEN ORGANICS AND SWITCH TO FORTNIGHTLY RESIDUAL WASTE Over time savings likely to increase further, eg; • technology & market forces • education & environmental awareness increases yields • if waste levy rises

  18. CO-COLLECTION OF DOMESTIC FOOD WASTE AND GARDEN ORGANICS Conclusion: • can be introduced with financial savings if community perceives environmental benefits and accepts these require change in behaviour • if introduce & retain weekly disposal of residual waste, cost of approx $16/hh/pa represents approx 1.7% ave increase in rates

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