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advanced digestion technology

Integration of New Biowaste Facilities on Waste Water Treatment Infrastructure Dorian Harrison, Technical Director (Monsal). advanced digestion technology. Project Brief . Develop AD Assets / Strategy in Scotland for Biowaste Plant 1 - 30,000 tpa (Cumbernauld)

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advanced digestion technology

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  1. Integration of New Biowaste Facilities on Waste Water Treatment Infrastructure Dorian Harrison, Technical Director (Monsal) advanced digestion technology

  2. Project Brief • Develop AD Assets / Strategy in Scotland for Biowaste • Plant 1 - 30,000 tpa (Cumbernauld) • Plant 2 - 40,000 tpa (Prestwick) • Plant 3 - 40,000 tpa (Johnstone) • Merchant Site • Category 3 Material • Separate Packaged Feed Materials • Produce High Quality (PAS110) Product • Maximise Revenue from Energy Generation • Integrate into Existing Facility advanced digestion technology advanced digestion technology

  3. Project Procurement & Team • Initial OJEC Notice (short list 6 bidders) • Phase 1 – Permit Design Development • Phase 2 – Detail Design Development • Phase 3 – Construction Phase advanced digestion technology advanced digestion technology

  4. Project Overview • Existing Open Windrow and IVC Composting Facility • Mixed green waste • Catering waste • Slurries (Odour) • Current Capacity 40,000 tpa • New Biowaste AD – Additional 30,000 tpa • Kerbside collection (source segregated) • Packaged food waste • Category 3 • Commercial and industrial (C&I) • Slurries • 1MWe Generation advanced digestion technology advanced digestion technology

  5. Cumbernauld - Site History • Site History • Operated as Deerdykes STW • Converted to open windrow composting facility (2003) • In vessel composting completed (2008) • Merchant AD facility (2010) advanced digestion technology advanced digestion technology

  6. Integration Issues – WwTW Upgrade to Biowaste • Difficulties • Traffic management • Electrical Connection • Discharge Consent • Permit Modification • Planning Permission • Product (PAS110 / Waste Exemption License) • Benefits • Dilution Effluent • Existing Discharge to Sewer / Liquor Treatment? • Existing Logistics • Trained Operations Staff • Grid Connection / Generating Capacity advanced digestion technology advanced digestion technology

  7. Permitting Issues • Odour at boundary 1.5OUe • NOx, SOx emissions • Noise • Effluent (liquor treatment) • Normal operation • Abnormal operation • Best Available Technology • Environmental risk assessment integral with design risk assessment • Modelling of emissions (noise, NOx, SOx, odour) • Design to minimise emissions • Environmental HAZOP to look at risks • Visit working sites to familiarise • Define BAT advanced digestion technology advanced digestion technology

  8. Commercial Viability • Revenue Streams (Maximise!) • Gate fee • Power • Product • Opex Costs (Minimise!) • Parasitic power • Fuel costs • Manpower • Product? • Infrastructure Cost • Minimise development costs (phased contract) • Biowaste AD asset specification • Development support advanced digestion technology advanced digestion technology

  9. 30,000 Biowaste plant– Short Mass Balance Waste 30,000 tpa Compost 16,600 tpa Power 1 MWe Pre-Processing Biogas AD plant CHP Biogas production 439 m3/h Makeup Water 40 - 90 m3/d Waste Water 36 m3/d advanced digestion technology advanced digestion technology

  10. Monsal Biowaste Flowsheet advanced digestion technology advanced digestion technology

  11. Feed Preparation for Digestion • Up to 20% Contamination • Solids 20% to 40% • This is what we get • What we Want • Solids ~ 10% by weight • Contamination < 0.25% in feed advanced digestion technology advanced digestion technology

  12. Cleaning up Biowaste – how it works advanced digestion technology advanced digestion technology

  13. Ideal Feed to Digester • Liquified Slurry Feed (Wet Digestion) • 10% DS • 12mm screened • Low Contaminants • PAS110 req <0.5% by Weight • Digestion Concentrates Contamination • 0.25% Feed = 0.5% Cake advanced digestion technology advanced digestion technology

  14. Required Product • Contamination < 0.5% • PAS110 compliant • Product • 25 – 35% dry solids advanced digestion technology advanced digestion technology

  15. Conclusions • Co-development of Biowaste AD with WW assets minimises development costs & programme • Planning • Permitting • Synergises – liquors, power, infrastructure, staff. • Water industry pedigree of client and technology provider ensures robust quality and professional project delivery • Biowaste asset standard optimised to deliver good commercial IRR • Model can be expanded rapidly across Scotland (Plants 2 & 3) delivering: • 110,000 tpa capacity • 4 MWe + renewable energy • Valuable compost for recycling advanced digestion technology advanced digestion technology

  16. Acknowledgments • Scottish Water Horizons • Donald MacBrayne • Helen Gillard • Kristine Leitch • Enviros • Jonty Olufsen • Joe Short • HBS • Andrew Russell • Bill Taylor • SEPA • WRAP (demonstrator program) advanced digestion technology

  17. Thank You Dorian Harrison Technical Director (Monsal) advanced digestion technology

  18. Magnetic Separation (for source segregated?) advanced digestion technology advanced digestion technology

  19. Waste Dissolvers • Liquify Organic Material • Separate out Heavy Contaminants • Float Light Contaminants advanced digestion technology advanced digestion technology

  20. Animal By-Products • Category 1 • Incineration • Category 3 • 70oC for 1 hour as a batch • <12mm in one plane • Category 2 • Rendering • 133oC for 20 minutes as a batch • 3 bar pressure • No Disposal to Agricultural Land • Catering Waste (UK) • Meat Excluded • Biogas - 57C for 5 hour as a batch • <50mm in one plane • 18 days storage advanced digestion technology advanced digestion technology

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