project overview waste pathways: outlook 2007 justin lang, city of burnside
DESCRIPTION
Project Overview Waste Pathways: Outlook 2007 Justin Lang, City of Burnside. Overview. Trial preparation – lead times Background info on GO presentation Scope of organics audits Participation & barriers to uptake Resident survey Composting sessions Recommendations. Implementation. - PowerPoint PPT PresentationTRANSCRIPT
Overview
• Trial preparation – lead times• Background info on GO presentation• Scope of organics audits• Participation & barriers to uptake• Resident survey• Composting sessions• Recommendations
Implementation
• Large trial area
• Representative housing, demographics, etc
• Limited contact with residents
• Professional information for community
Trial brochure
• Key messages:– Fortnightly service– Place material in GO Bin– Clean & simple to use– Current service has
achieved 56% diversion – 50% of residual stream is
organic (2004 CoB audit)– Bio baskets will help divert
up to 75% of residential waste stream
– As easy as one, two, three…
Audit methodology
Adapted from Kerbside Performance reporting:• Assess participation and resident behaviour
(contamination, no. of bags);• Monitor presentation rates, tonnages, yields per
household;• Assess WHERE organics are going (both waste
and GO streams).
Results
• Participation• Contamination• Diversion (and potential diversion)• Weight per bag• Bag consumption• Yields per household (kilograms)
2004 Kerbside Audit (W&R)Composition of material – as presented (n=76)
62% capacity 2nd bins 62%
69% capacity
recyclables
waste
Compostables(kg)
Not assessedCon
tents
not
ass
ess
ed.Not assessed
Not assessed
58% capacity
recyclables
waste
66% capacity
Compostables53.9%
Othermaterial23.0%
Recyclables17.9%
Misc plastics5.2%
Recyclables96.6%
05/06 Bio Basket Organics Audit (W&GO)Composition of material – as presented
(n=245, GO n=192, waste n=241)
Compostable green organic material (kg)
Food waste & compostable material (kg)
contamination (kg)
66% capacity, 2nd bins 65%
Typical participants
5.00 kg food waste/ fortnight
~17.00 kg green organics per
fortnight
Negligiblefood in residual
Rec. W
56% capacity
Conte
nts
not
ass
ess
ed.
59% capacity
Bio bags presented in GO bin
Food in residual
Rec. W
56% capacity
Conte
nts
not
ass
ess
ed.
“Non participants”
Substantial food in residual
Rec. W Rec. W
Participation
• 245* premises incl. in organics audits• 192/245 premises (78%) presented GO bins• 132/192 presented food waste in GO Bins
(69% of GO Bins presented). • Based upon kerbside audits, this represents a
participation rate of 54% (132/245).
• Home composters (~9-18) • 3.2 bags per wk/hh
Results - diversion
• 36.3% diversion of the residual organic waste
• 8.6% diversion of the total waste stream
green organics64.6%
diverted
15.4% organic
20% residualrecyclablesfood (8.6%)
Food waste per household
0
5
10
15
20
25
<.04kg
<2 kg <4 kg <6 kg <8 kg <10 kg <12 kg <14 kg <20 kg <54.96kg
% diversion of organics per household
0
5
10
15
20
25
30
0% < 10% < 20% < 30% < 40% < 50% < 60% < 70% < 80% < 90% < 99.5% 100%
(No GO presented)
% diversion food waste per household
0
5
10
15
20
25
30
35
40
45
50
<1% < 10% < 20% < 30% < 40% < 50% < 60% < 70% < 80% < 90% < 99.5% 100%
Results - contamination
• Green organics stream– 2.79% contamination of green organics
bins (by weight)– 23% incident rate of contamination– Typically garden pots etc
• Negligible contamination within cornstarch bags
Results – telephone survey
• 98% trial community awareness• 84% had used the system• 77% continued to use the system (93%
were happy to continue)• 81% of current users and 48% former
users – “very easy” to use• No issues with odour• Willingness $, 5+ bags,
other disposal methods
Composting / sessions
• Telephone survey 38% (34) composting
• 13 resident info sessions (3 hr sessions) - free Gedye bin
• Part of exit strategy (in conjunction with continued use). Cornstarch bags available from Council office.
Kerbside collection
• Performance of trucks (monthly audits)• Weight per load & daily tonnages• Determine average yield / household• Contamination
– CCTV– 2 strikes policy– Removal of service
Barriers to uptake
• Basic GO service (since 1997) monthly (optional user-pays service)
• 39% dwelling units / flats• GO Bin ownership relatively low (~65%)• Split bin service collected weekly (by
necessity) compared with opportunity for Councils with 3 bin systems to reduce effective volume of residual waste containers (fortnightly collections)
Recommendations
• Reduce residual waste collection frequency (reduced cost of collection offsets bio basket cost & ongoing bag costs)
• This also has the potential to:- increase diversion ratio (for each h/hold) and - increase participation (get more onboard)
• LG report available.