Suppressing Nitrite-oxidizing Bacteria Growth to Achieve Nitrogen Removal from Domestic Wastewater via Anammox Using Intermittent Aeration with Low Dissolved Oxygen.

ABSTRACT: Achieving nitrogen removal from domestic wastewater using anaerobic ammonium oxidation (anammox) has the potential to make wastewater treatment energy-neutral or even energy-positive. The challenge is to suppress the growth of nitrite-oxidizing bacteria (NOB). This study presents a promising method based on intermittent aeration with low dissolved oxygen to limit NOB growth, thereby providing an advantage to anammox bacteria to form a partnership with the ammonium-oxidizing bacteria (AOB). The results showed that NOB was successfully suppressed using that method, with the relative abundance of NOB maintained between 2.0-2.6%, based on Fluorescent in-situ Hybridization. Nitrogen could be effectively removed from domestic wastewater with anammox at a temperature above 20?°C, with an effluent total nitrogen (TN) concentration of 6.6?±?2.7?mg/L, while the influent TN and soluble chemical oxygen demand were 62.6?±?3.1?mg/L and 88.0?±?8.1?mg/L, respectively.

SUBMITTER: Ma B 

PROVIDER: S-EPMC4564738 | biostudies-literature | 2015 Sep

REPOSITORIES: biostudies-literature