Urea, tshuaj formula CH4N2O, yog ib qho tshuaj tsis haum. Urea yog synthesized industrially nrog ammonia thiab carbon dioxide nyob rau hauv tej yam kev mob. Urea yog yooj yim soluble hauv dej. Ntawm 20 degree, 105 grams tuaj yeem yaj hauv 100 ml dej. Cov tshuaj aqueous reacts neutrally. Nws muaj zog hygroscopicity thiab cov ntaub ntawv lumps tom qab absorbing noo noo. Qhov tseem ceeb hygroscopic point ntawm 20 degree yog 80% txheeb ze av noo, tab sis ntawm 30 degree, qhov tseem ceeb hygroscopic point poob mus rau 72.5%. Yog li ntawd, urea yuav tsum raug zam los ntawm kev khaws cia rau hauv qhov chaw ntub dej ntawm lub caij ntuj sov.
Ammonia dej yog hais txog aqueous tov ntawm ammonia, uas muaj ib tug muaj zog pungent tsw thiab tsis muaj zog alkaline. Ammonia dej yog ib qho yooj yim rau volatilize ammonia roj. Lub volatility nce nrog qhov nce ntawm qhov kub thiab qhov txuas ntxiv ntawm lub sijhawm cia, thiab qhov volatility nce nrog qhov nce ntawm concentration. Ammonia dej muaj cov nyhuv corrosive. Ammonia roj yog teeb meem rau tib neeg lub cev. Cov dej xau yog qhov ua rau tawg thiab muaj qee yam txaus ntshai.
Qhov zoo ntawm urea denitrification yog: kev siv nyab xeeb, urea yuav luag tsis muaj kev phom sij, thiab zoo dua rau cov dej ammonia txaus ntshai hauv kev cia thiab siv; raw cov ntaub ntawv yooj yim kom tau txais thiab tsis txwv los ntawm cov txheej txheem.
Qhov tsis zoo ntawm urea denitrification yog: qhov ua tau zoo ntawm urea denitrification yog me ntsis qis dua li ntawm ammonia denitrification, txog 10% qis dua; urea yog ib qho yooj yim kom nqus dej noo thiab tawv thaum khaws cia.
Qhov tsis zoo ntawm ammonia denitrification yog: ammonia yog qhov txaus ntshai heev, thiab kev siv ammonia yuav tsum muaj cov txheej txheem kev pom zoo, uas ua rau muaj kev nyuaj ntawm kev siv ammonia; ammonia leakage yog qhov ua rau muaj xwm txheej, yog li kev siv ammonia yuav tsum muaj ntau yam kev ruaj ntseg ntsuas; ungasified ammonia feem ntau yuav corrode cov yeeb nkab phab ntsa, ua rau muaj kev nyab xeeb.
Qhov zoo ntawm ammonia denitrification yog qhov ua tau zoo ntawm ammonia denitrification yog me ntsis siab dua li ntawm urea denitrification, txog 10% siab dua.
Hauv cov ntsiab lus, cov lag luam siv ammonia lossis urea rau denitrification yuav tsum xav txog tus nqi ntawm cov khoom siv raw hauv zos raws li lawv tus kheej qhov xwm txheej; Feem ntau hais lus, nws yooj yim dua thiab muaj kev nyab xeeb dua los xaiv urea rau denitrification. Qhov tseeb, feem ntau ntawm cov tuam txhab xaiv urea rau denitrification.
