Pilot scale anion selectrodialysis for water reclamation and nutrient recovery from UASB effluent after nitrification, ultrafiltration and UV C treatment

In the frame of increasing need nutrient recovery and recycling objective was to fractionate concentrate nutrients from nitrified, ultra-filtered ultraviolet C treated UASB effluent with anion selectrodialysis (aSED). Under these conditions it possible keep system in operation for 14 days or even 3 weeks intermittent cleaning place every week. When membranes developed sulphuric acid production (PC-Acid 100 OT) were used as exchange (AE membranes) instead standard AE (PC-SA) a 4.5 times higher current efficiency phosphate transport noted. The diluate aSED is reusable e.g. cooling water condensers. product stream which enriched (5–6 mmol.L ?1 ) brine accumulated potassium (150 nitrate (90 are suitable recovery. During optimization process increased tenfold, 0.7% 7%. fed lamella separator (with molar Ca/P ratio ± 1.93) recover 98% phosphate. recovered precipitate free magnesium contained equivalent 30 38 m% P 2 O 5 ; XRD analysis showed presence hydroxyapatite. this decreased proportionally degree aeration expel dissolved inorganic carbon feed aSED, indicating less coprecipitation calcium carbonate within • Anion combines reclamation N, K fractionation. Ca (PO 4 precipitated separator. (max. 82 ? 38% only contaminated CaCO . Up 80% nitrate-N concentrated 3.2 times. By specific tenfold.