Cov pa oxygen dissolved yog hais txog cov pa oxygen yaj hauv dej, feem ntau sau tseg ua DO, qhia hauv milligrams ntawm oxygen ib liter dej (hauv mg / L lossis ppm).Qee cov organic tebchaw yog biodegraded nyob rau hauv qhov kev txiav txim ntawm cov kab mob aerobic, uas siv cov pa yaj hauv dej, thiab cov pa oxygen yaj tsis tuaj yeem muab ntxiv rau lub sijhawm.Cov kab mob anaerobic hauv cov dej hauv lub cev yuav nrawm nrawm, thiab cov organic teeb meem yuav tig lub cev dej dub vim kev noj nyiaj txiag.tsw.Tus nqi ntawm cov pa oxygen yaj hauv dej yog qhov taw qhia los ntsuas tus kheej lub peev xwm ntawm lub cev dej.Cov pa oxygen yaj hauv dej tau noj, thiab nws yuav siv sijhawm luv luv los rov qab los rau hauv lub xeev thawj zaug, qhia tias lub cev dej muaj peev xwm ua kom nws tus kheej muaj zog, lossis cov dej hauv lub cev muaj kuab paug tsis loj.Txwv tsis pub, nws txhais tau hais tias cov dej hauv lub cev yog qias neeg, lub peev xwm ua kom huv ntawm tus kheej tsis muaj zog, lossis txawm tias lub peev xwm ua kom huv ntawm tus kheej poob.Nws yog ze ze rau ib nrab siab ntawm oxygen nyob rau hauv cov huab cua, atmospheric siab, dej kub thiab dej zoo.
1.Aquaculture: txhawm rau ua kom lub ntsws xav tau ntawm cov khoom hauv dej, saib xyuas cov ntsiab lus ntawm cov pa oxygen, tsis siv neeg lub tswb, tsis siv neeg oxygenation thiab lwm yam haujlwm.
2.Kev saib xyuas dej zoo ntawm cov dej ntuj: Tshawb xyuas qhov kev ua qias tuaj thiab kev ua kom huv ntawm tus kheej ntawm cov dej, thiab tiv thaiv cov pa phem xws li eutrophication ntawm cov dej hauv lub cev.
3. Kev kho dej phwj tuaj, tswj cov ntsuas: anaerobic tank, aerobic tank, aeration tank thiab lwm yam ntsuas tau siv los tswj cov dej kho cov nyhuv.
4. Tswj qhov corrosion ntawm cov ntaub ntawv hlau hauv cov kav dej muaj dej: Feem ntau, cov sensors nrog ppb (ug / L) ntau yog siv los tswj cov kav dej kom ua tiav xoom oxygen kom tsis txhob xeb.Nws yog feem ntau siv nyob rau hauv fais fab nroj tsuag thiab boiler khoom.
Tam sim no, feem ntau cov pa oxygen meter nyob rau hauv kev ua lag luam muaj ob txoj hauv kev ntsuas: membrane method thiab fluorescence method.Yog li dab tsi yog qhov txawv ntawm ob?
1. Membrane method (tseem hu ua polarography method, txoj kev siab tas li)
Cov txheej txheem membrane siv cov txheej txheem electrochemical.Lub semi-permeable membrane yog siv los cais cov platinum cathode, nyiaj anode, thiab electrolyte los ntawm sab nraud.Feem ntau, cov cathode yuav luag ncaj qha nrog cov yeeb yaj kiab no.Oxygen diffuses los ntawm daim nyias nyias ntawm qhov sib piv proportional rau nws ib nrab siab.Qhov siab dua cov pa oxygen ib nrab, cov pa ntau dua yuav dhau los ntawm daim nyias nyias.Thaum yaj oxygen tsis tu ncua nkag mus rau hauv daim nyias nyias thiab nkag mus rau hauv cov kab noj hniav, nws raug txo rau ntawm cathode los tsim ib qho tam sim no.Qhov tam sim no yog ncaj qha proportional rau cov yaj oxygen concentration.Ib feem ntawm lub 'meter' undergoes amplifying processing los hloov cov ntsuas tam sim no mus rau hauv ib chav tsev concentration.
2. Fluorescence
Lub fluorescent sojntsuam muaj ib lub teeb nyob rau hauv uas emits xiav lub teeb thiab illuminates lub fluorescent txheej.Cov tshuaj fluorescent emits liab tom qab zoo siab.Txij li cov pa oxygen molecules tuaj yeem tshem tawm lub zog (cov nyhuv quenching), lub sijhawm thiab kev siv ntawm lub teeb liab zoo siab yog cuam tshuam nrog cov pa oxygen molecules.Cov concentration yog inversely proportional.Los ntawm kev ntsuas cov theem sib txawv ntawm lub teeb liab zoo siab thiab siv lub teeb pom kev zoo, thiab muab piv nrog cov nqi ntsuas sab hauv, cov concentration ntawm oxygen molecules tuaj yeem xam tau.Tsis siv cov pa oxygen thaum ntsuas, cov ntaub ntawv ruaj khov, kev ua tau zoo yog txhim khu kev qha, thiab tsis muaj kev cuam tshuam.
Cia peb txheeb xyuas nws rau txhua tus los ntawm kev siv:
1. Thaum siv cov polarographic electrodes, sov li tsawg kawg 15-30 feeb ua ntej calibration los yog ntsuas.
2. Vim yog kev noj cov pa oxygen los ntawm cov electrode, qhov concentration ntawm oxygen nyob rau saum npoo ntawm qhov kev sojntsuam yuav sai sai txo, yog li nws yog ib qho tseem ceeb uas yuav tsum tau do cov tshuaj thaum ntsuas!Hauv lwm lo lus, vim tias cov ntsiab lus oxygen ntsuas los ntawm kev siv cov pa oxygen, muaj kev ua yuam kev.
3. Vim qhov kev nce qib ntawm cov tshuaj tiv thaiv electrochemical, cov electrolyte concentration yog tas li noj, yog li nws yuav tsum tau ntxiv electrolyte tsis tu ncua kom ntseeg tau tias cov concentration.Txhawm rau kom ntseeg tau tias tsis muaj npuas nyob rau hauv cov electrolyte ntawm daim nyias nyias, nws yuav tsum tau tshem tawm tag nrho cov kua chambers thaum txhim kho daim nyias nyias lub taub hau cua.
4. Tom qab txhua qhov electrolyte ntxiv, lub voj voog tshiab ntawm kev ua haujlwm calibration (feem ntau yog xoom taw tes calibration hauv dej tsis muaj oxygen thiab nqes hav calibration hauv huab cua) yuav tsum tau siv, thiab txawm tias qhov ntsuas qhov ntsuas kub tsis siv neeg siv, nws yuav tsum tau kaw. rau Nws yog qhov zoo dua rau calibrate cov electrode ntawm qhov kub ntawm cov qauv tov.
5. Tsis muaj npuas yuav tsum tau tso rau ntawm qhov chaw ntawm lub semi-permeable membrane thaum lub sij hawm ntsuas, txwv tsis pub nws yuav nyeem cov npuas raws li cov pa oxygen-saturated qauv.Nws tsis pom zoo kom siv nws hauv lub tank aeration.
6. Vim yog txheej txheem txheej txheem, lub taub hau daim nyias nyias nyias, tshwj xeeb tshaj yog yooj yim rau tho rau hauv ib qho nruab nrab corrosive, thiab muaj lub neej luv luv.Nws yog ib qho khoom siv.Yog hais tias lub membrane puas lawm, nws yuav tsum tau hloov.
Raws li cov ntsiab lus, cov txheej txheem membrane yog qhov tseeb qhov yuam kev yog qhov sib txawv, lub sijhawm saib xyuas luv luv, thiab kev ua haujlwm muaj teeb meem ntau dua!
Yuav ua li cas txog txoj kev fluorescence?Vim yog lub hauv paus ntsiab lus ntawm lub cev, cov pa oxygen tsuas yog siv los ua cov khoom siv thaum lub sijhawm ntsuas, yog li cov txheej txheem ntsuas yog qhov pib tsis muaj kev cuam tshuam sab nraud!High-precision, txij nkawm-dawb, thiab zoo-zoo probes yeej ib txwm cia li tsis muaj neeg saib xyuas rau 1-2 xyoos tom qab installation.Puas yog txoj kev fluorescence yeej tsis muaj qhov tsis txaus?Tau kawg muaj!
Post lub sij hawm: Dec-15-2021