Emissions　of　greenhouse　gases　(GHGs)　from　a　full-scale　contact　oxidation　emergency　sewage　treatment　plant　(STP)　in　Japan　that　was　damaged　by　an　earthquake　and　a　tsunami　were　measured.　The　open　chamber　(OC)　and　closed　chamber　(CC)　methods　were　used　to　sample　the　gases　emitted　in　the　aeration　tank　and　the　settler,　respectively.　The　dissolved　gases　were　measured　using　the　headspace　method,　and　the　major　emissions　sources　in　wastewater　treatment　were　identified.　The　results　indicated　that　the　GHG　emissions　from　the　wastewater　were　58.6　g-CO2/m(3)　(equivalent　per　cubic　meter　of　wastewater).　The　CH4　emissions　showed　a　strong　negative　correlation　with　the　dissolved　oxygen　(DO)　content.　More　than　98%　of　the　GHGs　were　produced　and　stripped　by　the　aeration　tank.　The　CO2,　CH4　and　N2O　emissions　accounted　for　73.0%　(21,781　mL/m(3)),　17.1%　(669　mL/m(3))　and　9.9%　(10.9　mL/m(3)),　respectively,　of　all　GHG　emissions.　Approximately　1.06%　of　the　incoming　chemical　oxygen　demand　(COD)　was　emitted　as　CH4,　and　0.147%　of　the　removed　nitrogen　was　emitted　as　N2O.　(C)　2019　Elsevier　B.V.　All　rights　reserved.