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Bokashi Composting: Performance Monitoring Presentation to WasteMINZ Conference 16 October 2009 Dr Sean Barnes – Aurecon NZ Neville Burt – Bokashi NZ.

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Presentation on theme: "Bokashi Composting: Performance Monitoring Presentation to WasteMINZ Conference 16 October 2009 Dr Sean Barnes – Aurecon NZ Neville Burt – Bokashi NZ."— Presentation transcript:

1 Bokashi Composting: Performance Monitoring Presentation to WasteMINZ Conference 16 October 2009 Dr Sean Barnes – Aurecon NZ Neville Burt – Bokashi NZ

2 Summary of Presentation Introduction and Research Drivers The Bokashi Process Our Methodology Results and Discussion Conclusions Where to From Here?

3 Introduction and Drivers

4 What is Bokashi?

5 Bokashi Composting + =

6 Decentralised Waste Treatment HOUSEHOLDS: COMMERCIAL: ON-SITE USE COMMUNITY GARDENS PARKS/RESERVES AGRICULTURE

7 The New Bigger Bokashi Bins

8 What Did We Monitor? SOLIDS + COMPOST-ZING LIQUID BURIAL IN GARDEN/MEDIA Analysis Key Nutrients Carbon Composition

9 The Trials TRIAL 1TRIAL 2 5 WEEKS

10 What Happened? TRIAL 1

11 Composition of Juice Varied between trials and over time Low pH – around 4 to 4.5 High COD (soluble) – 83,000 to 160,000mg/L Nitrogen (ammonia) – 2,000mg/L + Phosphorus (organic) – 1,400mg/L & 360mg/L + Potassium – 2,600mg/L + Trends FERM 1 FERM 2

12 COD Generation

13 The Fermentation Trial 1 had higher nutrient and COD levels High juice content from predominantly vegetable waste in Trial 2  Differences based on feed material Juice production = waste volume reduction Lactic acid production assumed  Liquid fertiliser (after pH adjustment)

14 Fermentation Microbes Solid Polymeric Material Macromolecules (e.g. Starch) Monomers (e.g. Glucose) Fermentation Products (e.g. Lactic Acid) EM Microbes Lactic Acid Bacteria Photosynthetic Bacteria Yeasts Actinomycetes Pathogens Faecal Coliforms Clostridium sp. Staphylococcus sp. Salmonella sp. Listeria sp.

15 Microbial Parameters (Liquid) High numbers of microbes (aerobic/anaerobic) Faecal Coliforms and Escherichia coli present in first sample of Trial 1 only NO BAD GUYS! Below Detection Limits  Enterobacteriaceae, Staphylococcus aureus, Clostridium perfringens, Listeria monocytogenes, Salmonella sp.

16 What Did We Monitor? SOLIDS + COMPOST-ZING LIQUID BURIAL IN GARDEN/MEDIA Analysis Key Nutrients Carbon Composition

17 Fermented Food Waste 5 Weeks Composting Dry basis: N 2.4%0.9% P0.2%0.1% K0.4%0.5% C30% (Lit) Trial 0 Weeks

18 Post-Burial Analysis (0 to 8 Weeks) Org Matter: Trial 1: 38.6% to 46.2% Trial 2: 6.1% to 8.5% C Trial 1: 22.4% to 26.8% Trial 2: 3.5% to 4.9% N Trial 1: 1.2% to 1.7% Trial 2: 0.4% to 0.5% P Trial 1: 0.2% to 0.4% Trial 2: 0.2% slight increase K Trial 1: 0.5% to 0.7% Trial 2: 0.2% to 0.3% Trial 4 Weeks

19 Conclusions Common food pathogens absent in juice samples after fermentation No discernable odour High N, P and K content in juice + low pH Solid material breaks down rapidly in soil or compost pile Further targeted testing of COD composition and microbes on commercial systems.

20 Decentralised Waste Treatment HOUSEHOLDS: COMMERCIAL: ON-SITE USE COMMUNITY GARDENS PARKS/RESERVES AGRICULTURE

21 Where To From Here? Waiheke Island – Mudbrick Vineyard, Te Whau Brasserie, Lure Vineyard, Café Get Stuffed Hamilton (Back to Earth Programme) Hanmer Springs (Business Association) Waitakere City (Project Circle)

22 Standards To Be Met Resource Consent Requirements Work with Regional Councils BioGro Certification NZ – NZBPCC Standards

23 The Future: Microsheds/Transition Towns

24 Questions + Contact Details Neville Burt – Sean Barnes –

25 The Juice (Liquid Product)


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