A pilot-scale study tested several technologies to treat biogas digestate— the residue from anaerobic digestion of dairy, animal, and some crop wastes—so that nutrients can be recovered and the material can be reused. The digestate was processed through microfiltration, ultrafiltration, reverse osmosis, selective electrodialysis, and UV/ozonation. Early filtration steps removed over 80% of solids and large organic molecules, while reverse osmosis removed nearly all remaining dissolved substances, producing clean water suitable for reuse. Selective electrodialysis recovered over 95% of ammonium and potassium and about 55% of phosphate, 75% of which was turned into struvite, a valuable fertilizer.
Nutrient-recovery-from-digestate-Pilot-test-experiments.pdf
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Written by Maria Dodou
Dr. Maria Zachariou-Dodou is civil and public health engineer, with MSc degree from University College London and PhD in Chemical Engineering from NTUA in the field of wastewater treatment and reuse. She has 40-year experience in working both in the public sector in Cyprus, as well as in the private sector in a large number of countries with emphasis on water resources management, water treatment and reuse, and desalination processes. She has a great experience in designing and implementing EU funded projects mostly dealing with providing innovative solutions to environmental challenges.
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