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Sewage Sludge – Challenge Or Opportunity
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Sewage Sludge – Challenge Or Opportunity






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Sewage Sludge – Challenge Or Opportunity Sewage Sludge – Challenge Or Opportunity Presentation Transcript

  • S EWAGE S LUDGE W ASTE O R V ALUABLE R ESOURCE? The challenges and opportunities in the next 10 years
  • Sewage sludge – The challenges
    • Approximately 1.5 million tonnes dry solids annually
    • Legislation will increase this figure and change the nature of sewage sludge (Water Framework Directive)
      • Legislation & Codes of Practise restrict the disposal route
      • ADAS Safe Sludge Matrix (restriction on the type of sewage sludge to land)
      • Sludge (Use in Agriculture) Regulations 1989
      • EU sludge directive (encouragement of reuse of sewage sludge)
      • Landfill Directive (35% of 1995 levels by 2016)
    • Is sewage sludge a substance to be disposed of or a product to be produced?
  • 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
  • Sewage sludge – The opportunities
    • Methane Production from Advanced and Conventional Digestion
    • Energy recovery from incineration or pyrolysis
    • Nutrient Recovery from sludge liquors
    • Utilisation of sludge liquors in BNR Processes
    • Biosolids to agricultural land
    • Topsoil production from Sludge phytoconditioning
  • What are the future aims?
    • 3 main goals:
    • Reduce the amount of sludge that is produced and how it is processed
    • Maximise energy production from sludge
    • Transform sludge into marketable products
  • 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
  • Energy from sludge
    • Maximising energy throughput from sludges
    • There are a number of options:
    • Digestion and advanced digestion
    • Incineration or pyrolysis
    • Physical disintegration techniques
    • CHP –v- gas turbines –v- biofuel
  • 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
  • Summary
    • There is N O O NE solution – one size doesn’t fit all
    • Market and technologies not fully developed
    • There are opportunities as well as constraints
    • Sludge is a M ARKETABLE P RODUCT not a waste
  • Any Questions