The Flour Pot Bakery

Waste Audit & Biogas Potential

The Flour Pot Bakery’s stand at the Haile Village Farmer’s Market Danielle Keeter Bioenergy Summer School Internship 2009

The Inspiration for this Project

• Ryan Graunke’s paper “Food and Fuel: Biogas Potential at Broward Dining Hall” • Won the Student Research on Campus Sustainability Award from the Association of the Advancement of Sustainability in Higher Education (AASHE).

• http://www.aashe.org/documents/resources/Graunk e2008.pdf

http://farm4.static.flickr.com/3223/3 024356415_1d195ecbab.jpg?v=0

Experiment Goals

• Conduct waste audit for The Flour Pot Bakery • Quantify average methane output from food waste • Use food waste as feedstock for anaerobic digester

Methods

• • • Waste stream separated into: • Compostable paper • • • Food waste Recyclable metal/plastic • Plastics 1-7 and most metals 5 Non-recyclable Grind food waste to start homogenizing the sample Blend sample in food processor to complete homogenization • Food waste then baked to analyze volatile solid content

Source 4

The Process of Anaerobic Digestion

Anaerobic Digester Technology

•Energy Park’s anaerobic digester: •1 lb daily •100 liters daily at peak Anaerobic digester design: continuous stir tank reactor.

The Benefits of Biogas

• • • • • Provides power from waste Decreases amount of material going to landfills Nutrient rich output • Use as fertilizer May be scaled according to project size Provides local source of power http://snre.ufl.edu/pubsevents/source/spring0 8/images/best2.png

Alachua County Waste Data

• Total Municipal Solid Waste Disposed 1 • 159,080 tons • Population 3 • 241,364 people Source: http://appprod.dep.state.fl.us/www_rcra/reports/WR/Recycling/2006An nualReport/AppendixG/Alachua.pdf

• MSW per capita 2 • 0.91 tons/capita 1. 2005 data. 2. 2006 data. 3. 2008 data.

Alachua County Waste Composition

• 800 tons per day of municipal solid waste • The remaining 68% is shipped to Union County Source: http://appprod.dep.state.fl.us/www_rcra/reports/WR/Recycl ing/2006AnnualReport/AppendixG/Alachua.pdf

About

The Flour Pot Bakery

• Traditional European style bakery • No preservatives, no artificial additives • Active in every local farmer’s market • The Flour Pot Bakery’s website: • http://www.theflourpotbakery.com/

Process

• • • • • • Two weeks of collection Separation Weighing Physical breakdown of food waste Analyze for volatile solid content • Provides methane output data Feedstock for anaerobic digester

Waste Audit Results

7/21/2009 7/22/2009 7/23/2009 7/24/2009 7/25/2009 7/27/2009 8/3/2009 8/4/2009

The Flour Pot Bakery Waste Audit Compostable Paper (lbs)

4.3

1.2

3.1

2.4

1 1.2

2.6

0.4

Food Waste (lbs) Non-Recyclable (lbs)

34.8

13.8

34.1

8.2

Recyclable (lbs) Total (lbs)

1.8

54.7

0.3

43.8

30.3

9.1

5.7

6.5

13 3.4

11.2

12.5

7.3

22 10.4

5.4

1.9

1 0.4

1.3

2.1

0.4

46.5

25 14.4

31 28.1

9.6

Waste Composition

36%

The Flour Pot Bakery: Waste Composition 7/21/09 through 8/4/2009

4% 6% 54% Compostable Paper (lbs) Food Waste (lbs) Non-Recyclable (lbs) Recyclable (lbs)

Volatile Solid Data

date

21-Jul 7/21/2009 7/21/2009 7/23/2009 7/23/2009 7/23/2009 7/24/2009 7/24/2009 7/24/2009 7/27/2009 7/27/2009 7/27/2009

tray

3.7553

3.7116

3.7358

3.7845

3.7655

3.6725

3.7159

3.7504

3.7232

3.6792

3.6697

3.6843

Average tray+WW WW

78.3795

78.0966

78.0667

75.4172

75.3506

75.7757

75.1754

75.0277

75.0575

75.021

75.9022

75.5263

74.6242

74.385

74.3309

71.6327

71.5851

72.1032

71.4595

71.2773

71.3343

71.3418

72.2325

71.842

MC (1-TS/WW)

0.224342774

0.234201788

0.238389418

0.34501003

0.344911162

0.354124366

0.710897781

0.708344732

0.706965653

0.373918236

0.379984079

0.379197405

0.416690619

tray+TS

61.6381

TS

57.8828

60.6755

60.347

50.7032

50.6601

56.9639

56.6112

46.9187

46.8946

50.2422

24.375

24.5388

24.6266

48.345

48.455

48.284

46.5697

20.6591

20.7884

20.9034

44.6658

44.7853

44.5997

TS/WW

0.775657

0.765798

0.761611

0.65499

0.655089

0.645876

0.289102

0.291655

0.293034

0.626082

0.620016

0.620803

0.583309

tray+ash ash

7.1302

3.3749

7.2601

6.8813

3.5485

3.1455

9.8638

10.1197

10.1074

4.9372

6.0793

6.3542

6.4349

1.2213

4.9376

5.0699

8.7308

9.4515

9.8231

1.1872

1.3467

5.0516

5.7818

6.1388

VS

54.5079

53.4154

53.4657

40.8394

40.5404

40.1348

19.4378

19.6012

19.5567

39.6142

39.0035

38.4609

VS/WW VS/TS

0.730432 0.941694

0.718094 0.937706

0.719293 0.944437

0.570122 0.870429

0.566325

0.8645

0.55663 0.861822

0.272011 0.940883

0.274999 0.942891

0.274156 0.935575

0.555273 0.886902

0.539972

0.8709

0.535354 0.862358

0.526055 0.905008

Volatile Solid Analysis

Physical Properties of The Flour Pot Bakery's Food Waste

7% 32% Moisture content Volatile Solids Ash 61%

Combined Results

• Average food waste output of 17.11 lbs/daily • 4.7 kg/daily of volatile solids • 72.25 ft 3 /daily methane production • 540.47 gallons/daily

In Summary

• Organize process with a local business • Analyze waste stream composition • Volatile solid content • Methane output • Potential to offset energy consumption

Sources

1. http://docs.google.com/gview?a=v&q=cache:Z6JfYHI4gs8J:www.co.alachua.fl.us/ass ets/uploads/images/gm/ear/Economic%2520Development/Recycling%2520and%252 0Waste%2520Alternatives.pdf+%22alachua+county%22+%22waste%22+%22comp osition%22&hl=en&gl=us 2. http://appprod.dep.state.fl.us/www_rcra/reports/WR/Recycling/2006AnnualReport/A ppendixG/Alachua.pdf

3. http://quickfacts.census.gov/qfd/states/12/12001.html

4. http://images.google.com/imgres?imgurl=http://wgbis.ces.iisc.ernet.in/energy/paper /Tr_114/chapter2_clip_image002.jpg&imgrefurl=http://wgbis.ces.iisc.ernet.in/energy /paper/Tr_114/chapter2.htm&usg=__U6uK6CrnOP5ZM_18_67VEVXXY38=&h=622&w =600&sz=22&hl=en&start=19&um=1&tbnid=OLczafCPsidIdM:&tbnh=136&tbnw=13 1&prev=/images%3Fq%3D%2522anaerobic%2Bdigestion%2522%2B%2522process %2522%2B%2522simple%2522%26hl%3Den%26sa%3DG%26um%3D1 5. http://www.alachuacounty.us/government/depts/pw/waste/recycling/bigblue/whattor ecycle.aspx