Volume 19 Issue 1
Feb.  2006
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YOU-MING TAN, YAN-QUN LIU, FEI SU, LIN WANG, QI-FANG LUO. Experimental Study on Denitrification Using Coated Electrode of Immobilized Denitrifying Bacteria[J]. Biomedical and Environmental Sciences, 2006, 19(1): 47-52.
Citation: YOU-MING TAN, YAN-QUN LIU, FEI SU, LIN WANG, QI-FANG LUO. Experimental Study on Denitrification Using Coated Electrode of Immobilized Denitrifying Bacteria[J]. Biomedical and Environmental Sciences, 2006, 19(1): 47-52.

Experimental Study on Denitrification Using Coated Electrode of Immobilized Denitrifying Bacteria

Funds:  国家自然科学基金(39870664)
  • Objective To develop a coated electrode of immobilized denitrificants and to evaluate the performance of a bioelectrochemical reactor to enhance and control denitrification. Methods Denitrifying bacteria were developed by batch incubation and immobilized with polyvinyl alcohol (PVA) on the surface of activated carbon fiber (ACF) to make a coated electrode. Then the coated electrode (cathode) and graphite electrode (anode) were transferred to the reactor to reduce nitrate. Results After acclimated to the mixtrophic and autotrophic denitrification stages, the denitrifying bacteria could use hydrogen as an electron donor to reduce nitrate. When the initial nitrate concentration was 30.2 mg NO3--N/L, the denitrification efficiency was 57.3% at an applied electric current of 15 mA and a hydraulic retention time (HRT) of 12 hours.Correspondingly, the current density was 0.083 mA / cm2. The nitrate removal rate of the reactor was 34.4 g NO3--N / m3·d, and the surface area loading was 1.34 g NO3--N / m2·d. Conclusion The coated electrode may keep high quantity of biomass, thus achieving a high denitrification rate. Denitrification efficiencies are related to HRT, current density, oxidation reduction potential (ORP), dissolved oxygen (DO), pH value, and temperature.
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    沈阳化工大学材料科学与工程学院 沈阳 110142

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Experimental Study on Denitrification Using Coated Electrode of Immobilized Denitrifying Bacteria

Funds:  国家自然科学基金(39870664)

Abstract: Objective To develop a coated electrode of immobilized denitrificants and to evaluate the performance of a bioelectrochemical reactor to enhance and control denitrification. Methods Denitrifying bacteria were developed by batch incubation and immobilized with polyvinyl alcohol (PVA) on the surface of activated carbon fiber (ACF) to make a coated electrode. Then the coated electrode (cathode) and graphite electrode (anode) were transferred to the reactor to reduce nitrate. Results After acclimated to the mixtrophic and autotrophic denitrification stages, the denitrifying bacteria could use hydrogen as an electron donor to reduce nitrate. When the initial nitrate concentration was 30.2 mg NO3--N/L, the denitrification efficiency was 57.3% at an applied electric current of 15 mA and a hydraulic retention time (HRT) of 12 hours.Correspondingly, the current density was 0.083 mA / cm2. The nitrate removal rate of the reactor was 34.4 g NO3--N / m3·d, and the surface area loading was 1.34 g NO3--N / m2·d. Conclusion The coated electrode may keep high quantity of biomass, thus achieving a high denitrification rate. Denitrification efficiencies are related to HRT, current density, oxidation reduction potential (ORP), dissolved oxygen (DO), pH value, and temperature.

YOU-MING TAN, YAN-QUN LIU, FEI SU, LIN WANG, QI-FANG LUO. Experimental Study on Denitrification Using Coated Electrode of Immobilized Denitrifying Bacteria[J]. Biomedical and Environmental Sciences, 2006, 19(1): 47-52.
Citation: YOU-MING TAN, YAN-QUN LIU, FEI SU, LIN WANG, QI-FANG LUO. Experimental Study on Denitrification Using Coated Electrode of Immobilized Denitrifying Bacteria[J]. Biomedical and Environmental Sciences, 2006, 19(1): 47-52.

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