Qhov sib txawv tseem ceeb ntawm anammox thiab denitrification yog tias anammox yog hais txog anaerobic ammonium oxidation, uas hloov ammonium thiab nitrites rau hauv cov roj nitrogen hauv cov mob anoxic. Lub caij no, thaum denitrification yog kev hloov pauv roj ntsha ntawm nitrate rau hauv N 2 los ntawm cov kab mob denitrifying.
Lub voj voog nitrogen yog lub voj voog biogeochemical tseem ceeb uas nitrogen hloov mus rau hauv cov tshuaj sib txawv xws li NH3, NH4 +, NO2,3 – thiab lwm yam. Muaj plaub txheej txheem loj pom hauv lub voj voog nitrogen. Lawv yog fixation, ammonification, nitrification, thiab denitrification. Ntau cov txheej txheem no yog ua los ntawm cov kab mob microorganisms, tshwj xeeb tshaj yog cov kab mob uas muaj nyob hauv av. Anammox yog ib qho tshiab ntxiv rau lub voj voog nitrogen. Nws yog cov txheej txheem ntawm anaerobic ammonium oxidation. Ib pawg kab mob tshwj xeeb hu ua planctomycetes ua cov txheej txheem no. Lawv muaj cov organelle tshwj xeeb hu ua anammoxosomes, uas muab lub xaib rau cov tshuaj tiv thaiv anammox. Txawm li cas los xij, thaum kawg, ob qho tib si denitrification thiab anammox tsim cov roj nitrogen.
Anammox yog dab tsi?
Anammox yog txheej txheem hu ua anaerobic ammonium oxidation. Nws yog cov tshuaj tiv thaiv uas siv ammonium thiab nitrite ua cov khoom siv hluav taws xob thiab tsim cov roj nitrogen hauv cov xwm txheej anoxic. Anammox cov tshuaj tiv thaiv yog ib qho ntawm qhov tseeb ntxiv rau biochemical nitrogen voj voog. Ib pawg tshwj xeeb ntawm cov kab mob zoo li planctomycete feem ntau tsav nws. Cov kab mob no muab lawv lub zog rau kev loj hlob los ntawm kev hloov pauv ntawm ammonium thiab nitrite rau hauv cov roj dinitrogen thaum tsis muaj oxygen. Lawv muaj ib qho anammoxosome: ib daim nyias nyias nyob hauv lub cytoplasm uas muab cov tshuab rau cov txheej txheem anammox. Ntxiv mus, cov kab mob no tau ntim nrog cytochrome c hom proteins, suav nrog cov enzymes uas ua cov tshuaj tiv thaiv catabolic tseem ceeb ntawm cov txheej txheem anammox, ua rau cov hlwb liab zoo kawg li. Cov kab mob Anammox qhia qhov kev loj hlob qeeb heev.
Daim duab 01: Anammox
Nyob hauv ib puag ncig marine, tshaj 50% ntawm N2 roj tso tawm tuaj yeem tsim los ntawm cov kab mob anammox. Tsis tas li ntawd, cov txheej txheem anammox muaj lwm txoj hauv kev zoo rau cov dej khib nyiab tam sim no rau kev tshem tawm cov ammonia-nitrogen (NH 4 -N). Nws kuj txuag tau ~ 75% nitrification thiab 100% denitrification ntawm lub voj voog nitrogen.
Denitrification yog dab tsi?
Denitrification yog cov txheej txheem ntawm kev txo cov nitrates hauv cov av rau hauv atmospheric nitrogen gas los ntawm denitrifying kab mob. Nws yog qhov opposite ntawm nitrification. Denitrification yog ib kauj ruam tseem ceeb hauv lub voj voog nitrogen, uas tso cov roj nitrogen ruaj khov rov qab rau hauv qhov chaw thiab ua tiav lub voj voog nitrogen.
Daim duab 02: Denitrification
Denitrification yog txhawb nqa los ntawm cov kab mob denitrifying xws li Pseudomonas, Clostridium, Thiobacillus denitrificans, Micrococcus denitrificans, thiab lwm yam. Cov kab mob no yog cov kab mob facultative anaerobic thiab heterotrophic. Lawv ua hauj lwm nyob rau hauv anaerobic los yog anoxic tej yam kev mob xws li waterlogged av. Lawv siv nitrate raws li lawv txoj kev ua pa substrate, thiab raws li qhov tshwm sim ntawm nws, nitrate raug tso tawm raws li gaseous nitrogen rau qhov chaw. Ib yam li ntawd, cov kab mob denitrifying muaj peev xwm txo tau nitrates thiab nitrites rau nws qhov tshwm sim tshwm sim diatomic daim ntawv nitrogen gas. Los ntawm cov txheej txheem no, atmospheric Nitrogen theem tau rov tsim dua mus rau qhov qub concentration.
Cov tshuaj tiv thaiv denitrification yog qhia hauv qab no.
NO3– NO2–→ TSIS + N2O → N2 (g)
Dab tsi zoo sib xws ntawm Anammox thiab Denitrification?
- Anammox thiab denitrification yog ob qho tseem ceeb ntawm lub voj voog nitrogen.
- Cov txheej txheem no tsim cov roj nitrogen.
- Cov kab mob yog cov kab mob tseem ceeb uas ua tiav ob txoj kev.
Qhov txawv ntawm Anammox thiab Denitrification yog dab tsi?
Anammox yog anaerobic ammonium oxidation, uas yog cov tshuaj tiv thaiv uas hloov ammonium thiab nitrites rau hauv cov pa roj nitrogen hauv cov xwm txheej anoxic. Nyob rau hauv sib piv, denitrification yog txo cov nitrate rau gaseous nitrogen los ntawm denitrifying kab mob. Yog li, qhov no yog qhov sib txawv tseem ceeb ntawm anmmox thiab denitrification. Dhau li ntawd, txheej txheem anammox yog cov tshuaj tiv thaiv ntawm NH4+ + NO2- → N2 + 2H2O, thaum denitrification yog cov tshuaj tiv thaiv NO3 – → NO2– → TSIS + N2 O → N2 (g). Yog li, qhov no yog lwm qhov sib txawv ntawm anammox thiab denitrification.
Ntxiv mus, anammox cov tshuaj tiv thaiv yog ua los ntawm cov kab mob uas muaj nyob rau hauv planctomycetes (Brocadia, Kuenenia, Anammoxoglobus, Jettenia thiab Scalindua hom). Hauv qhov sib piv, denitrification yog ua los ntawm cov kab mob xws li Pseudomonas, Clostridium, Thiobacillus denitrificans, Micrococcus denitrificans, thiab lwm yam. Yog li, qhov no kuj yog qhov sib txawv tseem ceeb ntawm anammox thiab denitrification.
Summary – Anammox vs Denitrification
Anammox yog cov tshuaj tiv thaiv uas hloov ammonium thiab nitrites rau hauv cov pa roj nitrogen hauv cov kab mob anoxic los ntawm cov kab mob anammox, thaum denitrification yog cov txheej txheem ntawm kev txo nitrate thiab nitrite rau nitrogen gas los ntawm denitrifying kab mob. Ob qho anmmox thiab denitrification yog cov txheej txheem tseem ceeb hauv lub voj voog biochemical nitrogen. Yog li, qhov no yog cov ntsiab lus ntawm qhov sib txawv ntawm anammox thiab denitrification.
