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Haiyan Wang, Qianyu Hang, John Crittenden, Yuexi Zhou +2
A novel combined process is proposed for treating ammonium-rich wastewater with low C/N ratio, utilizing autotrophic nitritation and bioelectrochemical-sulfur denitrification.
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A novel combined autotrophic nitritation and bioelectrochemical-sulfur denitrification (CANBSD) process was developed for treatment of synthetic ammonium-rich wastewater with low carbon/nitrogen ratio. Total nitrogen removal of the CANBSD was higher than 95 %, the effluent SO₄²⁻ was lower than 1280 mg L⁻¹, and the maximum nitrogen volumetric loading rate was 1.2 kg m⁻³ day⁻¹ when (1) the influent NH₄⁺-N was lower than 1008 mg L⁻¹, (2) hydraulic retention time was between 3.7 and 32 h, (3) the DO was between 0.5 and 1.2 mg L⁻¹, (4) the pH was between 7.5 and 8.2, and (5) the temperature was between 28 and 30 °C. Both the NH₄⁺-N removal and conversion to NO₂⁻-N in the nitritation membrane reactor (NMBR) were maintained at about 50 %, and the residual NH₄⁺-N and accumulated NO₂⁻-N were subsequently treated in the bioelectrochemical-sulfur three-dimensional denitrification reactor. The CANBSD energy consumption was 0.13 and 3.4 kWh m⁻³, respectively, for influent NH₄⁺-N of 100 and 1000 mg L⁻¹. The energy consumption of CANBSD was close to that of partial nitritation-ANNMMOX.