3 years ago

Deep purification of low-strength ammonium-containing wastewater with ANRE process

Deep purification of low-strength ammonium-containing wastewater with ANRE process
Ammonium-nitrogen pollution is the main cause of waterbody eutrophication and has been a severe problem for the treatment of river and groundwater. In this paper, a novel Advanced Nitrogen REmoval (ANRE) process was successfully developed based on anaerobic ammonium oxidation (ANAMMOX), aiming at the treatment of low-strength ammonium-containing wastewaters (5–15mg/L NH4 +-N). The ANRE process was demonstrated to be high-efficient with the substrate (ammonium and nitrite) removal efficiency up to 97% and the effluent ammonium concentration less than 1mgN/L. Kinetic analysis indicated that the maximum specific ammonium utilization rate was 46.40mgN/(g VSS·d) and the half-saturation constants ks was 0.25mgN/L. The ANAMMOX granular sludge was observed to disaggregate gradually due to the consumption of extracellular polymeric substances (EPS). The Anaerobic Ammonium Oxidation Bacteria (AnAOB) were proved in the state of starvation, causing the stoichiometric change for cellular synthesis and energy production and leading to more nitrate accumulation.

Publisher URL: www.sciencedirect.com/science

DOI: S1369703X17302619

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