enabling high-quality recycling of bio-waste through...
TRANSCRIPT
Enabling high-quality recycling of bio-waste through innovative waste separation technologies
3rd International Conference on Sustainable Solid Waste Management; Tinos, 3/07/2015
Katharina KrellGreenovate! Sprl, Belgium
The challenge: Efficient waste separation
Real challenge is to separate organics from the restCurrent solutions:
1. Separation at source / “kerbside collection”• Challenges of contamination and citizen participation• High logistics cost• Difficult in very low and very high density areas
2. Mechanical separation at centralised wastetreatment facilities• Often low separation efficiency• A lot of organics in non-organic fraction and vice versa
Organic fraction
Non-organic fraction
SEPARATION98% efficiency
The OREX press: a new approach to central separation of wastes
Plastic & TextilesPaper & CardboardMinerals & Metals
Homogenous semi-liquid biogenic fraction
Extruder press for MSW / SSO
High-pressure extrusion into two valuable waste streams that are each more valuable with the absence of the other
wet organic fraction dry non-organic
A 3-step process
Principle: Soluble organic matter behaves like a liquid and is separated from dry non-organic fraction
Feed phaseLow pressure
Expulsion phase
Low pressure
Physical properties / dry fraction
• Upstream density: 0.7/0.8 t/m³ approx.• Residual humidity: about 18-20%• Average caloric level: >14-16,000 kJ/kg• Organic: (except wood) <4-5%
After further separation• Sellable recyclables• High-quality fuel
-without much water content-With less odour and insects
Physical properties / wet fraction
• Upstream density: 0.8/0.9 t/m³ approx.• Residual humidity: about 60-65%
no floatation of material
• In case of AD: Biogas yield >180m³/hCH4 approx. 60%
• Low fiber level and very low contaminant level
After anaerobic digestion (AD):• Biogas• Clean digestate
OREX performance tests in UK and DE
Short term tests in UK• MSW Manchester – black bag & sub-streams• MSW Liverpool – black bag• Bio-waste Bedford – mixed garden & kitchen wasteLimitations of methodology:Mobile test press specs & number of samples!
Long-term tests in DE• Mixed rest waste• Separately collected bio-waste• Mono-streams
MSW Trials – Black Bag Manchester MSW Black bag Manchester
Average Separation
OREX TS VS Moisture ash VS/TS Original 100 37 34,8 63,0 2,3 94%Dry 55 63 51,3 37,0 11,7 82%Wet 45 28,6 25,1 71,0 4,3 88%
MSW Trials – Black Bag Liverpool
MSW Black bag Liverpool
Average Separation
OREX TS VS Moisture ash VS/TS Original 100 36 30,3 64,0 5,7 84%Dry 55 59 48,5 41,0 10,5 82%Wet 45 25,5 24,1 71,0 2,6 94%
MSW dry fraction: Gross Calorific Value16600
13100
7610
68406560
14200
0
2000
4000
6000
8000
10000
12000
14000
16000
18000kJ
/kg
MSW fractions
BB Manchester BB Screen Trommel Fines Heavy Rejects Organic Stockport BB Liverpool
MSW wet fraction: Methane yield
616
420
475
596
499
576
0
100
200
300
400
500
600
700L
CH4/
kg.V
S ap
plie
d
MSW fractions
BB Manchester BB Screen Trommel Fines Heavy Rejects Organic Stockport BB Liverpool
MSW wet fraction: Biogas potential
0
100
200
300
400
500
600
700
0 1 2 3 6 7 8 13 14 15 17 20 21
Met
hane
yie
ld (L
CH
4 pe
r kg.
VS a
pplie
d
Time (Days)Black Bag Manchester Black Bag Screen Trommel Fines Heavy RejectsOrganic Stockport Black Bag Liverpool Ø Average
Summary• The OREX extruder waste press is an alternative
approach to waste separation, based on materialtype rather than on size
• OREX can become the heart of modern MBT• The performance values claimed by the developer
have been largely confirmed in short-term testwith a mini test press so far
• Wet fraction from residual waste:– Little impurities (2,6-4,6%)– High methane yields (567-616 L CH4/kg VS)– High biogas yield (230-257 m3/tons)
• Dry fraction from residual waste:– High calorific values (14.2-16.6 MJ/ton)– Moisture reduced (37-41%)
17
Next steps
• Long-term tests with several waste streams in Germany
• In-depth analysis of undesirable materials in wet fraction
• LCA
• Environmental Impact Assessment
• Final presentation of results and open-door day at long-term test site at EGW in Gescher, Germany (Spring 2016)
Achieving high-quality organic feedstock for anaerobic digestion and composting through innovative separation technologies (2013-2016)www.separate-wastesystems.eu
European consortium:• db technologies, The Netherlands• Greenovate!, Belgium• Opportunity Peterborough, UK• EGW, Germany
Contact:Katharina Krell – Partner – Greenovate! Sprl, [email protected]: +32 2 400 1005