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Ireland’s Approach to Wastewater Sludge Management

Ireland’s Approach to Wastewater Sludge Management. Aoife Kyne June 2019. National Infrastructure. Large number of small WWTP’s (over 60% < 500 p.e.) Centralised treatment required for efficient resource recovery ~50% of WW sludge generated at 11 WWTPs > 50,000 PE.

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Ireland’s Approach to Wastewater Sludge Management

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  1. Ireland’s Approach to Wastewater Sludge Management Aoife Kyne June 2019

  2. Wastewater Sludge Strategy

  3. National Infrastructure • Large number of small WWTP’s (over 60% < 500 p.e.) • Centralised treatment required for efficient resource recovery • ~50% of WW sludge generated at 11 WWTPs > 50,000 PE Wastewater Sludge Strategy

  4. Wastewater Treatment Levels Wastewater Sludge Strategy

  5. Type of Sludge Treatment (2016) AD = anaerobic digestion ATAD – autothermalthermophillic aerobic digestion Wastewater Sludge Strategy

  6. Sludge Management • > 98% of wastewater sludge produced by Irish Water currently used in agriculture • Small quantities of sludge going to forestry and landfill • Pressure on sludge agricultural outlets due to food industry quality assurance schemes • Irish Water to develop quality assurance system for re-use of wastewater sludge • Alternative sludge outlets currently being assessed • Options for phosphorus recovery being considered for larger wastewater treatment plants • Upgrades to sludge treatment to increase anaerobic digestion to increase energy recovery and reduce sludge quantities Wastewater Sludge Strategy

  7. Sludge Quantities Notes: • Total sludge quantity approximately 230,000 tonnes per annum • Actual sludge quantities in 2025 likely to be less than predicted

  8. Restrictions in Landspreading • Groundwater vulnerability • Soil metal levels (cadmium and nickel) Wastewater Sludge Strategy

  9. Potential Areas Suitable for Biosolids Excludes areas of:- Extreme groundwater vulnerability High soil cadmium levels High soil nickel levels Over 50% of agricultural land potentially suitable Further restrictions due to Natura 2000 sites, type of agriculture etc.

  10. Challenges • Data accuracy and availability • Monitoring of on-site and off-site activities • Level of compliance with legislation • Compliance with Code of Good Practice • Stakeholder perception • Impact of any proposed changes on DBO contracts and/or SLA agreements Wastewater Sludge Strategy

  11. Opportunities and Constraints

  12. Options to Progress

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