Cost-efficient nitrogen removal from reject water and sewage via partial nitritation-anammox
DOI:
https://doi.org/10.35933/ENTECHO.2019.04.001Keywords:
anammox, deammonification, municipal wastewater, reject water, nitritation bacteria, nitratation bacteriaAbstract
Partial nitritation-anammox (PN/A) process removes nitrogen from wastewater with 50% reduction of aeration costs, 80% less excess sludge and no consumption of organic carbon. PN/A is an established process for the removal of nitrogen from reject water from anaerobic digestion and other similarly warm and concentrated streams. On such wastewater, PN/A has been applied in full scale for over 10 years under names such as ANAMMOX®, ANITA™ Mox, DEMON® or TERRAMOX®, whose optimized installations consistently achieve nitrogen removal loading rates of 0,5–2,3 kg∙m–3∙d–1. The current challenge for research is to implement PN/A into the main stream of cold municipal wastewater, the specific challenges being (i) suppression of undesirable nitrite oxidizing bacteria (NOB) and (ii) adaptation of anammox microorganisms to low temperatures. Our initial experiences with one-stage PN/A in the main stream led us to the separation of PN/A in two subsequent reactors. Subsequently, we developed a strategy for NOB suppression in partial nitritation even under 12 °C, which we then successfully tested in the pilot scale. Furthermore, we found that anammox can be adapted to low temperatures using cold shocks. In sum, these results will enable extending the savings for nitrogen removal into the main stream of wastewater at WWTP.
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