Sewage Sludge – Challenge Or Opportunity

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Sewage Sludge – Challenge Or Opportunity

  1. 1. S EWAGE S LUDGE W ASTE O R V ALUABLE R ESOURCE? The challenges and opportunities in the next 10 years
  2. 2. Sewage sludge – The challenges <ul><li>Approximately 1.5 million tonnes dry solids annually </li></ul><ul><li>Legislation will increase this figure and change the nature of sewage sludge (Water Framework Directive) </li></ul><ul><ul><li>Legislation & Codes of Practise restrict the disposal route </li></ul></ul><ul><ul><li>ADAS Safe Sludge Matrix (restriction on the type of sewage sludge to land) </li></ul></ul><ul><ul><li>Sludge (Use in Agriculture) Regulations 1989 </li></ul></ul><ul><ul><li>EU sludge directive (encouragement of reuse of sewage sludge) </li></ul></ul><ul><ul><li>Landfill Directive (35% of 1995 levels by 2016) </li></ul></ul><ul><li>Is sewage sludge a substance to be disposed of or a product to be produced? </li></ul>
  3. 3. What is the future? Changes in how sewage sludge is produced and in what quantity The demands of the market Value of energy Government subsidies on renewables Legislation
  4. 4. Sewage sludge – The opportunities <ul><li>Methane Production from Advanced and Conventional Digestion </li></ul><ul><li>Energy recovery from incineration or pyrolysis </li></ul><ul><li>Nutrient Recovery from sludge liquors </li></ul><ul><li>Utilisation of sludge liquors in BNR Processes </li></ul><ul><li>Biosolids to agricultural land </li></ul><ul><li>Topsoil production from Sludge phytoconditioning </li></ul>
  5. 5. What are the future aims? <ul><li>3 main goals: </li></ul><ul><li>Reduce the amount of sludge that is produced and how it is processed </li></ul><ul><li>Maximise energy production from sludge </li></ul><ul><li>Transform sludge into marketable products </li></ul>
  6. 6. Sludge reduction and production Salsnes - Primary tank replacement with sludge dewatering changes the way sludge is thickened, dewatered and transported LODOred 100k – up to 45% sludge reduction of surplus activated sludges Changes in sludge and how its produced in the wastewater process
  7. 7. Energy from sludge <ul><li>Maximising energy throughput from sludges </li></ul><ul><li>There are a number of options: </li></ul><ul><li>Digestion and advanced digestion </li></ul><ul><li>Incineration or pyrolysis </li></ul><ul><li>Physical disintegration techniques </li></ul><ul><li>CHP –v- gas turbines –v- biofuel </li></ul>
  8. 8. Sludge as a marketable product Technology exists its how you produce it and how you sell it Sludge as a marketable product Biofert production at 13,200 tDS/annum Sludge phytoconditioning Biogas as a biofuel or supply to the gas grid Ringsend 50% of energy from biogas Sludge liquors as a product Pearl & Crystal Green
  9. 9. Summary <ul><li>There is N O O NE solution – one size doesn’t fit all </li></ul><ul><li>Market and technologies not fully developed </li></ul><ul><li>There are opportunities as well as constraints </li></ul><ul><li>Sludge is a M ARKETABLE P RODUCT not a waste </li></ul>
  10. 10. Any Questions

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