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Composting Toilet Technology

Composting Toilet Technology

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Composting Toilet Technology

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  1. Composting Toilet Technology Chris Salmon GHD, Environment Group Manager NZ Composting Toilet Technology

  2. Composting Toilets – Yuck! Composting Toilet Technology

  3. Composting Toilets – Yuck! Composting Toilet Technology

  4. It’s About Perception  there is no rule that composting toilets must be ugly Composting Toilet Technology

  5. It’s About Perception Composting Toilet Technology Photo credit - Reece

  6. It’s About Perception Composting Toilet Technology Photo credit - Reece

  7. It’s About Perception Composting Toilet Technology Photo credit - Reece

  8. Urine Separation – what!!  It means just what it says It’s much easier than it sounds Composting Toilet Technology

  9. DCT Resource Benefits Save water and Recover most nutrients Composting Toilet Technology

  10. Volume Comparison CONVENTIONAL TOILETS COMPOSTING TOILETS 30 tonnes of sewage/household/year 1 tonne of urine and compost/household/year 95% water 90% urine Composting Toilet Technology

  11. Waste Loads Exported 12 Sewer 10 8 Tonne/c.yr Flushing Water Faeces & Paper Urine & Leachate 6 4 2 DCT 0 Composting Toilet Technology

  12. Loads from Excreta 2 0.8 Grey Water 30 150 11 88% 1.5 65% 10 25 42% 1 50 28% WC 8 TN g/c.d Flow L/c.d Composting toilets can divert all of the components in black water (brown shaded area) to agriculture. BOD g/c.d TP g/c.d g/c.d in urine Composting Toilet Technology

  13. Feasibility Study Report To download a pdf copy of the executive summary or the full report go to: http://www.ghd.com.au/compostloo Composting Toilet Technology

  14. Outline of Project Composting Toilet Technology

  15. Partners Smart Water Fund Driving innovative water-saving technologies www.smartwater.com.au Demaine Partnership Pty Ltd Architect www.demaine.net Environment Equipment Designing dry toilet technology www.rotaloo.com Bensons Property Developer www.bensonsproperty.com.au Composting Toilet Technology

  16. Graphic (section through apartment) Composting Toilet Technology

  17. Trial Reuse Area  1.2ha of dry land crops and controls - $350,000 over 3 years Composting Toilet Technology

  18. Public Acceptance  Question: Would you consider purchasing an apartment with a Dry Composting Toilet? Would Consider 55% Unlikely 17% May Consider 28% Composting Toilet Technology

  19. Public Acceptance  Question: Would you consider paying $5000 extra for better water and energy efficiency? May Unlikely 6% Consider 18% Would Consider 76% Composting Toilet Technology

  20. Health – the All Important Issue From Stored Urine: Bacterial: <10-15 Protozoan infection: <10-7 Viral: <10-3 Negligible risk from compost Manageable risk for workers Manageable risk for householders Composting Toilet Technology

  21. Economics of DCTs Backlog/Unsewered Town Areas  Financial advantage  Increased if water cost increases Inner Urban  Similar cost to sewerage  Lower if water cost increases Composting Toilet Technology

  22. Energy Usage  DTC will not increase energy use Composting Toilet Technology

  23. Conclusions on DCTs  Composting toilets are feasible and safe  They divert nutrients to beneficial use  They save 28 tonnes water per household each year  They free sewerage system capacity  They can save energy  They are less costly in backlog or unsewered areas  They are of similar or lower cost in sewered areas  A monitored demonstration is needed and justified Composting Toilet Technology

  24. Detailed Drawing  Composting Toilet Technology