Pronk, W.; Zuleeg, S.; Lienert, J.; Escher, B.; Koller, M.; Berner, A.; Koch, G. and Boller, M. (2007) Pilot Experiments with Electrodialysis and Ozonation for the Production of a Fertilizer from Urine. Water Science and Technology, 56 (5), pp. 219-227.
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Pilot tests were performed with a process combination of electrodialysis and ozonation for the removal of micropollutants and the concentration of nutrients in urine. In continuous and batch experiments, maximum concentration factors up to 3.5 and 4.1 were obtained, respectively. The desalination capacity did not decrease significantly during continuous operation periods of several weeks. Membrane cleaning after 195 days resulted in approximately 35% increase in desalination rate. The Yeast Estrogen Screen (YES), a bioassay that selectively detects oestrogenic compounds, confirmed that about 90% of the oestrogenic activity was removed by electrodialysis. HPLC analysis showed that ibuprofen was removed to a high extent, while other micropollutants were below the detection limit. In view of the fact that ibuprofen is among the most rapidly transported micropollutants in electrodialysis processes, this result indicates that electrodialysis provides an effective barrier for micropollutants. Standardised plant growth tests were performed in the field with the salt solution resulting from the treatment by electrodialysis and subsequent ozonation. The results show that the plant height is comparable to synthetic fertilisers, but the crop yield is slightly lower. The latter is probably caused by volatilisation losses during field application, which can be prevented by improved application technologies.
|EPrint Type:||Journal paper|
|Keywords:||Anbautechnik einjährige Kulturen, Biohortikultur, Agricultural application, membrane technology, micropollutants, nutrient recovery, urine treatment|
|Subjects:|| Crop husbandry|
Soil > Soil quality
Environmental aspects > Air and water emissions
|Research affiliation:||Switzerland > FiBL - Research Institute of Organic Agriculture Switzerland > Crop Production > Vegetables/Ornamentals|
|Deposited By:||Koller, Martin|
|Deposited On:||07 Mar 2008|
|Last Modified:||12 Apr 2010 07:36|
|Refereed:||Peer-reviewed and accepted|
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