AI Article Synopsis
- A three-dimensional biofilm electrode reactor (3D-BER) combined with pyrite-autotrophic denitrification (PAD) was developed to explore how electrical current affects the system's start-up period and efficiency.
- Results indicated that higher current levels shorten start-up time and enhance nitrate removal efficiency, reaching about 88.2% after 13 days at 20 mA.
- The study also found that optimal current levels (10 or 20 mA) supported the growth of beneficial denitrifying bacteria and boosted the expression of related functional genes, contributing to a better understanding of the system's denitrification mechanisms.
Article Abstract
In this study, a three-dimensional biofilm electrode reactor (3D-BER)/pyrite-autotrophic denitrification (PAD) coupled (3D-BER-PAD) system was constructed, aiming at investigating the effect of current on the start-up period of the system. The results showed that increasing current could shorten the system's start-up period and improve nitrate removal efficiency (NRE). When the current was 20 mA, the system could start stabilization after approximately 13 days and maintain a stable NRE (88.2 ± 3.4 %) with low energy consumption (0.05 ± 0.003 kW·h/gNO-N). Additionally, an appropriate current (10 or 20 mA) promoted the reproduction of denitrifying bacteria (e.g., Thiobacillus and Thermomonas) and the expression of functional genes involved in denitrification and sulfur oxidation. Finally, the denitrification mechanism and electron transfer model in the 3D-BER-PAD system were proposed. This study has reference value for the rapid start-up and the improvement of treatment efficiency in the 3D-BER-PAD system.
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| http://dx.doi.org/10.1016/j.biortech.2024.131719 | DOI Listing |
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