Chemical　absorption-biological　reduction　based　on　Fe(II)EDTA　is　a　promising　technology　to　remove　nitric　oxide　(NO)　from　flue　gases.　However,　limited　effort　has　been　made　to　enable　direct　energy　recovery　from　NO　through　production　of　nitrous　oxide　(N2O)　as　a　potential　renewable　energy　rather　than　greenhouse　gas.　In　this　work,　the　enhanced　energy　recovery　in　the　form　of　N2O　via　biological　NO　reduction　was　investigated　by　conducting　short-term　and　long-term　experiments　at　different　Fe(II)EDTA-NO　and　organic　carbon　levels.　The　results　showed　both　NO　reductase　and　N2O　reductase　were　inhibited　at　Fe(II)EDTA-NO　concentration　up　to　20　mM,　with　the　latter　being　inhibited　more　significantly,　thus　facilitating　N2O　accumulation.　Furthermore,　N2O　accumulation　was　enhanced　under　carbon-limiting　conditions　because　of　electron　competition　during　short-term　experiments.　Up　to　47.5%　of　NO-N　could　be　converted　to　gaseous　N2O-N,　representing　efficient　N2O　recovery.　Fe(II)EDTA-NO　reduced　microbial　diversity　and　altered　the　community　structure　toward　Fe(II)EDTA-NO-reducing　bacteria-dominated　culture　during　long-term　experiments.　The　most　abundant　bacterial　genus　Pseudomonas,　which　was　able　to　resist　the　toxicity　of　Fe(II)EDTA-NO,　was　significantly　enriched,　with　its　relative　abundance　increased　from　1.0　to　70.3%,　suggesting　Pseudomonas　could　be　the　typical　microbe　for　the　energy　recovery　technology　in　NO-based　denitrification.　©