Notably, ammonia-oxidizing (EC 1.7.2.6) and nitrite-reducing (EC 1.7.2.2) enzyme genes generally showed a trend of downregulation under the GAC treatment.
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Granular activated carbon (GAC)-driven microbial electron shuttle boosts denitrification and mitigates N<sub>2</sub>O in cold and carbon-limited biofilm system.
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