Mainstream short-cut nitrogen removal and mainstream deammonification success represent a paradigm shift for the industry, offering the opportunity for sustainable wastewater treatment, energy neutral or even energy positive facilities and dramatic reductions in treatment costs, which has widespread environmental, economic and societal benefits. It was this clear driver and the success of sidestream deammonification processes that got both academics and industry globally invested in applied collaborative research from the early start onwards. Since then, about 10 years have passed, and a range of technologies has been proposed including suspended, granular, biofilm and hybrid approaches with each of them having a list of required conditions to achieve NOB out-selection, leading to aeration control strategies such as AvN. Although some success has been shown in pilot studies, no clear transition towards full-scale implementation has been observed. The major limitation for full-scale implementation has been related to the difficulty of NOB out-selection and its lack of guarantee for success throughout seasonal changes. Also the recent discovery of comammox organisms, being able to perform full nitrification, might slow down full-scale implementation even more. To move towards full-scale applications of short-cut nitrogen removal we must work to achieve nitrite availability for anoxic ammonium oxidizing bacteria (AnAOB or anammox) in mainstream systems. Short-cut N removal systems developed on the basis of the partial denitrification (PdN route) rather than NOB out-selection route (Fig.1) will likely provide more reliable nitrite production and could accelerate full-scale implementation of short-cut N technologies.
|Effective start/end date||9/1/20 → 8/31/23|
- Water Research Foundation (Wells AGMT 12/15/20//84008601)
- Environmental Protection Agency (Wells AGMT 12/15/20//84008601)