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Development of Sulfidogenic Sludge from Marine Sediments and Trichloroethylene Reduction in an Upflow Anaerobic Sludge Blanket Reactor
Published on: October 15, 2015
Performance and functional flora of simultaneous nitrogen removal, desulfurization and electricity generation in
Changzi Guo1, Dongchan Xi1, Liyuan Shao1
1School of Environmental Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China.
Abstract:
In this study, a novel SAD-anammox-MFC coupled system was constructed for simultaneous nitrogen removal, desulfurization, and electricity generation. The optimal total nitrogen (TN) removal efficiency of 82.1% was achieved under the following conditions: a sludge inoculation ratio (SADB:AnAOB) of 1:2, external resistance of 500 Ω, influent sulfide concentration of 300 mg S/L, and hydraulic retention time (HRT) of 60 h. The maximum power density (1406.25 mW/m3) occurred at 300 mg S/L and an HRT of 24 h. A longer HRT promoted complete sulfide oxidation and allowed anammox to become the dominant nitrogen removal pathway, with the highest coulombic efficiency (18.20%) at 60 h. Microbial community analysis revealed that the cathode was enriched with the anammox bacterium Candidatus Brocadia (35%) and denitrifying bacterium unclassified_f_PHOS-HE36 (5%), while the anode was dominated by Thiobacillus (15%-20%) and Sulfuricurvum (10%-15%), forming a stable functional zonation. This study provides a low-carbon and resource-oriented solution for treating sulfur- and nitrogen-containing wastewater.
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