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Rena Angelidaki

PIGMAN. A sustainable solution for pig manure treatment: Environmental compliance with the Integrated Pollution Prevention and Control directive (PIGMAN). Rena Angelidaki. Cost EU project - Partners. Main environmental problems caused by pig manure. Contamination soil and ground water

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Rena Angelidaki

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  1. PIGMAN A sustainable solution for pig manure treatment: Environmental compliance with the Integrated Pollution Prevention and Control directive (PIGMAN) Rena Angelidaki

  2. Cost EU project - Partners

  3. Main environmental problems caused by pig manure • Contamination soil and ground water • Contamination surface water • Emission of green house gasses (carbon dioxide and methane) • Emission of ammonia gas (acidification) • Odour emission

  4. Pig manure on Cyprus

  5. Main objective PIGMAN To develop and test a working prototype of a digester + water treatment plant: • Removal of organic matter (anaerobic digestion) • P precipitation as struvite • N removal by partial ammonia oxidation process

  6. Process flow chart

  7. Anaerorbic digestion Biogas Manure Water Water treatment Digester Other Solids Compost

  8. P removal as struvite Mg2+ + NH4+ + HPO42- + 6H2O  MgNH4 PO4 · 6H2O + H+ Struvite precipitation • > 90% of the phosphate is removed from the water • Solids and organic matters are removes which gives 50% COD reduction and 30% N reduction • Every kg P gives 7,9 kg MgAP (MgAP is a fertilizer which can be dry used)

  9. Ammonia removal • Conventional: nitrification/denitrification • Novel: OLAND = oxygen-limited autotrophic nitrification/denitrification

  10. Flowsheet suggestion CH4-prod., COD reduct., Part. P removal P removal, partial N removal N removal CH4-prod., COD reduction COD reduction Clean Waste Water Oland process Anaerobic dig. UASB reactor Anphos Separation

  11. DTU’s activities: • Codigestion of manure together with animal byproducts • Ultrafiltration of centrifugate • Struvite precipitation • UASB reactor for further COD removal • Oland process

  12. Hegndal biogas plant Reactor Decanter Centrifuge Ultra filter

  13. The effluent from the decanter centrifuge is collected in an underground tank (Hegndal Biogas plant).

  14. The tank (H=170cm, D=130cm) where the membrane was installed Technical specifications of Mitsubishi membranes MBR test unitgiven by the supplier: Membranes:Submerged, capilliar Producer: Mitsubishi Rayon Company, Japan Surface membrane: 1.5 m2 Withdrawal flow: 30 l/hr Back flush flow: 1.5 * withdrawal flow = 45 l/hr

  15. Membrane filtration unit.

  16. The liquor in the membrane filtration tank

  17. Foaming 12 hours after initiation of the filtration

  18. Clogged membrane after 3 days of operation

  19. The liquor after membrane filtration

  20. Biofilm microbial community overview (DAPI) Biofilm formation on the membrane surface Microbial communites in the biofilm studied by FISH Archaea (ARC 915) Eubacteria (EUB 338 and EUB 338+)

  21. Conclusions for the membrane filtration step • Maximal obtained outflow rate -12 L filtrate per hour. • Aeration of the membrane creates foaming after 12 hours. • Clogging of the membrane was observed after 3-4 days of operation (back flushing with water was not able to completely remove accumulated particles). • The membrane was not suitable for practical application (filtration of the decanter centrifuge effluent).

  22. UASB (Upflow anaerobic sludge blanket) experiments

  23. Future activities • Treatment of the UASB effluents with: • Anphos • Oland

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