Pre-concentration of ammonium to enhance treatment of wastewater using the partial nitritation/anammox process
2015 (English)In: Environmental technology, ISSN 0959-3330, E-ISSN 1479-487X, Vol. 36, no 10, 1256-1264 p.Article in journal (Refereed) Published
The anaerobic ammonium oxidation (anammox) process is one of the most cost-effective technologies for removing excessive nitrogen compounds from effluents of wastewater treatment plants. The study was conducted to assess the feasibility of using ion exchange (IE) and reverse osmosis (RO) methods to concentrate ammonium to support partial nitritation/anammox process, which so far has been used for treating only wastewater with high concentrations of ammonium. Upflow anaerobic sludge blanket (UASB) reactor effluents with 40.40, 37.90 and 21.80 mg NH4N/L levels were concentrated with IE method to 367.20, 329.50 and 187.50 mg NH4N/L, respectively, which were about nine times the initial concentrations. RO method was also used to concentrate 41.0 mg NH4N/L of UASB effluent to 163 mg NH4N/L at volume reduction factor 5. The rates of nitrogen removal from respective RO pretreated concentrates by partial nitritation/anammox technology were 0.60, 1.10 and 0.50 g N/m(2)day. The rates were largely influenced by initial nitrogen concentration. However, rates of RO concentrates were 0.74, 0.92 and 0.81 g N/m(2)day even at lower initial NH4N concentration. It was found out from the study that higher salinity decreased the rate of nitrogen removal when using partial nitritation/anammox process. Dissolved oxygen concentration of similar to 1 mg/L was optimal for the operation of the partial nitritation/anammox process when treating IE and RO concentrates. The result shows that IE and RO methods can precede a partial nitritation/anammox process to enhance the treatment of wastewater with low ammonium loads.
Place, publisher, year, edition, pages
2015. Vol. 36, no 10, 1256-1264 p.
nitrogen, partial nitritation, upflow anaerobic sludge blanket, ion exchange, reverse osmosis
IdentifiersURN: urn:nbn:se:kth:diva-161940DOI: 10.1080/09593330.2014.984770ISI: 000350042700005PubMedID: 25399876ScopusID: 2-s2.0-84924080019OAI: oai:DiVA.org:kth-161940DiVA: diva2:801088
QC 201504082015-04-082015-03-202015-04-08Bibliographically approved