Nitrogen recovery from reject water by production of nitrite concentrate via nitritation, membrane processes and ion exchange
Paweł Wiercik , Magdalena Domańska , Tomasz Konieczny
AbstractThe digester reject water is an ammonium-rich sidestream produced from sludge dewatering at wastewater treatment plants (WWTPs). The removal or recovery of nitrogen from this kind of wastewater is conducted by means of biological and membrane processes, air stripping or cation exchangers. The aim of the presented research was to recover the nitrogen contained in digester reject water as nitrite concentrate so that it could be used as a fertilizer or inhibitor of H2 S formation in sewers. Digester rejects water that underwent nitritation, microfiltration, nanofiltration was fed through anion exchanger at Janówek WWTP Test Station. To the authors’ knowledge, the recovery of nitrogen in the aforementioned processes from the real reject water as nitrite concentrate has not been performed yet. The conducted research demonstrated the usefulness of Lewatit S 5428 (Lanxess Deutschland GmbH, BU LPT, D-51369 Leverkusen) to obtain at least 2% nitrite concentrate in most eluate samples throughout a few months of exploitation. Nevertheless, the significant changes of the feed constitution during storing and high concentration of chlorides and sulfates in the eluate (even during NaHCO3 regeneration), reduced the possibility of its utility. Only the eluate from the first stage of NaCl regeneration could be used to check its impact on the inhibition of H2 S formation.
|Journal series||Desalination and Water Treatment, ISSN 1944-3994, e-ISSN 1944-3986, (N/A 100 pkt)|
|Publication size in sheets||0.5|
|Keywords in English||Digester reject water, Anion exchange resin, Nitrogen recovery, Nitrite removal|
|ASJC Classification||; ;|
|Score||= 100.0, 29-09-2020, ArticleFromJournal|
|Publication indicators||: 2018 = 0.509; : 2018 = 1.234 (2) - 2018=1.29 (5)|
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