Effective nitrogen removal from ammonium-depleted wastewater by partial nitritation and anammox immobilized in granular and thin layer gel carriers

WATER RESEARCH

卷:183

Article

Landreau, Matthieu¹  Byson, Samuel J.¹  You, HeeJun¹  Stahl, David A.¹  Winkler, Mari K. H.¹ 

[1] Univ Washington, Dept Civil & Environm Engn, 201 More Hall,Box 352700, Seattle, WA 98195 USA

关键词: Cell immobilization;    AOB;    AOA;    Anammox;    Flow cell;    Temperature;    Dissolved oxygen;   

DOI  :  10.1016/j.watres.2020.116078

来源: Elsevier

【 摘 要 】

This study investigates the effect of physicochemical conditions on the partial nitritation and anammox treatment by immobilized ammonia oxidizers under ammonium-deplete conditions. The impact of oxygen and temperature was studied by measuring the activity of immobilized aerobic and anaerobic ammonia-oxidizing organisms (Ammonia-oxidizing bacteria (AOB) and archaea (AOA), and Anammox bacteria) embedded in polyvinyl alcohol - sodium alginate (PVA-SA) beads and in thin layer polyethylene glycol hydrogels. Beads and flat hydrogels were incubated in a fluidized bed reactor (FBR) and in two flow cells, respectively. Both systems were fed with synthetic wastewater (15 mg N-NHVL) at different temperatures (20 degrees C and/or 30 degrees C) and different dissolved oxygen (DO) concentrations (0.1, 0.3, 0.5 and/or 1 mg/L) over 152 and 207 days, respectively. The FBR system had a maximum removal rate of 1.7 g-N/m(3) id at 0.1 mg O-2/L, corresponding to 80% removal efficiency, while a high aerobic ammonia-oxidizing activity but a partial oxygen inhibition of Anammox bacteria were observed at higher DO concentrations. In both flow cells, nitrogen removal efficiency was highest (80%) at 30 degrees C and 1 mg O-2/L while removal was less favorable at lower DO and lower temperature. Our results indicate a potential use of hydrogel beads for an energy efficient technology with reduced aeration demand for treating low ammonia wastewater, while layered hydrogels are a possible first step for biological treatments of wastewater using tangential flow. In addition, we provide blueprint drawings of the flow cells, which may be used to 3D-print the apparatus for other applications. (C) 2020 Elsevier Ltd. All rights reserved.

【 授权许可】

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