Dissolved oxygen (DO) ua lub luag haujlwm tseem ceeb hauv kev tswj hwm kev noj qab haus huv ntawm cov dej hauv dej thiab txhawb nqa lub neej hauv dej. Qhov concentration ntawm cov pa oxygen yaj hauv dej ncaj qha cuam tshuam rau cov dej zoo thiab lub qhov dej - yog cov kab mob hauv dej. Niaj hnub no cia peb tham txog cov ntsiab lus tseem ceeb ntawm cov pa oxygen yaj, cov qauv kev ua haujlwm, cov ntawv thov tseem ceeb thiab yuav xaiv qhov zoo li cas.
Dissolved Oxygen yog dab tsi?
Dissolved oxygen(DO) yog hais txog cov pa oxygen uas muaj nyob hauv dej, qhov tseem ceeb rau kev ciaj sia ntawm cov kab mob hauv dej. Nws yog ntsuas nyob rau hauv milligrams ib liter (mg / L), thiab nws cov concentration yog ib tug tseem ceeb qhia ntawm dej zoo. Lub cev dej noj qab haus huv txhawb txoj sia, tab sis thaum cov pa oxygen poob qis, nws tuaj yeem ua rau lub neej hauv dej, cuam tshuam ecological tshuav nyiaj li cas, thiab qhia tias muaj kuab paug.
Cov Ntsiab Cai Ua Haujlwm ntawm Dissolved Oxygen Sensors
Muaj ob txoj kev ntsuas kev siv ntau: Polarographic (Clark Electrode) thiab Optical.
Polarographic (Clark Electrode) Txoj Kev:
Txoj Cai Ua Haujlwm: Txoj kev no siv cov nyiaj / nyiaj chloride electrode thiab cov pa oxygen electrode los ntsuas qhov tam sim no tsim los ntawm kev txo cov pa oxygen ntawm cov hluav taws xob tshwj xeeb.
Qhov zoo: Nws muab qhov tseeb siab, tshwj xeeb tshaj yog nyob rau hauv ib puag ncig uas muaj cov pa oxygen tsawg. Nws yog ib tug dav siv, mature technology.
Disadvantages: Lub membrane yuav tsum tau permeable rau oxygen thiab yuav tsum tau ntxuav thiab hloov tsis tu ncua vim muaj peev xwm kis tau. Lub sensor tseem rhiab rau qhov kub thiab txias hloov pauv.
Txoj kev kho qhov muag:
Txoj Cai Ua Haujlwm: Optical dissolved oxygen sensors ua haujlwm siv cov txheej txheem fluorescence quenching. Ib lub wavelength tshwj xeeb ntawm lub teeb excites cov khoom fluorescent ntawm lub sensor qhov chaw, thiab qhov kev siv ntawm lub teeb emitted inversely correlates nrog cov yaj oxygen concentration.
Qhov zoo: Txoj kev no tsis muaj electrodes, tsis haus oxygen, thiab yuav tsum tau saib xyuas tsawg. Nws yog adaptive heev rau qhov kub thiab txias variations.
Qhov tsis zoo: Optical sensors nyiam kim dua piv rau polarographic sensors.
Cov ntawv thov tseem ceeb ntawm Cov Khoom Siv Hluav Taws Xob Cov Hluav Taws Xob
Kev Lag Luam Kev Kho Dej
Hauv kev kho cov dej phwj tuaj thiab cov dej khib nyiab, kev tswj cov qib oxygen yaj yog qhov tseem ceeb rau kev ua kom zoo ntawm cov organic teeb meem los ntawm cov kab mob. Cov txheej txheem activated sludge siv cov pa oxygen sensors los tswj cov tshuab aeration, kom ntseeg tau tias cov kab mob tuaj yeem kho cov dej zoo.
Kev Pom Zoo Ntau Yam: Feem ntau, cov pa oxygen yaj yuav tsum nyob nruab nrab ntawm 2-4 mg / L rau kev kho aerobic thiab 0-1 mg / L hauv thaj chaw anaerobic.
Kev saib xyuas ib puag ncig
Kev soj ntsuam cov pa oxygen hauv cov dej ntws, cov pas dej, thiab dej hiav txwv pab ntsuas kev noj qab haus huv ntawm cov dej hauv dej. Tsawg cov pa oxygen tsawg feem ntau qhia tias muaj kuab paug los yog kev nyuaj siab hauv ecological, thaum qib siab tuaj yeem ua rau muaj teeb meem algal blooms.
Pom Zoo Ntau Yam: Rau lub cev dej ntuj, cov pa oxygen yaj feem ntau yog nyob rau hauv thaj tsam ntawm 5-10 mg / L. Rau cov dej eutrophic, tswj qib ntawm 2-4 mg / L yog qhov tseem ceeb rau kev sib npaug ntawm ecosystem.
Kev lag luam Aquaculture
Hauv kev ua liaj ua teb ntses thiab cw, tswj kom muaj cov pa oxygen txaus yog qhov tseem ceeb rau kev noj qab haus huv thiab kev loj hlob ntawm cov tsiaj hauv dej. Sensors tso cai rau cov neeg ua liaj ua teb saib xyuas cov pa oxygen thiab kho cov tshuab aeration kom ua kom cov dej zoo.
Kev Pom Zoo Ntau Yam: Rau kev ua liaj ua teb ntses, thaj tsam ntawm 5-7 mg / L yog qhov zoo tagnrho, thaum ua liaj ua teb cw feem ntau xav tau 6-8 mg / L ntawm cov pa oxygen yaj.
Muaj Kev Tswj Xyuas Txheej Txheem
Hauv kev lag luam xws li fermentation thiab kev ua tshuaj lom neeg, yaj cov pa oxygen ncaj qha cuam tshuam rau microbial kev ua haujlwm thiab kev ua haujlwm ntawm cov tshuaj biochemical. Kev ntsuas kom raug yog qhov tseem ceeb kom ntseeg tau tias kev tsim khoom zoo.
Kev Pom Zoo Ntau Yam: Hauv cov txheej txheem fermentation, cov pa oxygen feem ntau yuav tsum tau tswj ntawm 2-6 mg / L kom muaj kev noj qab haus huv microbial.
Xaiv Txoj Cai Dissolved Oxygen Sensor
Xaiv qhov tsim nyog yaj oxygen sensor nyob ntawm ntau yam:
|
Xaiv Factor |
Polarographic |
Kho qhov muag |
|
Qhov tseeb |
Haum rau kev siv dav dav siv nrog cov kev cai qis dua |
Haum rau kev tshawb fawb thiab kev saib xyuas ib puag ncig nrog cov kev xav tau siab |
|
Kev tu |
Yuav tsum tau tu ncua sij hawm, hloov daim nyias nyias, thiab calibration |
Kev saib xyuas qis, ntev - lub sijhawm ruaj khov, tsis tas yuav tsum muaj kev saib xyuas tas li |
|
Kev txiav txim siab nqi |
Kev nqis peev qis qis dua, tsim nyog rau cov haujlwm uas muaj peev nyiaj tsawg |
Kev nqis peev ntau dua tab sis txo cov nqi mus sij hawm ntev - |
|
Kev thov ib puag ncig |
Haum rau kev siv txhua hnub, xws li kev saib xyuas dej khib nyiab, dej hauv dej, thiab lwm yam. |
Haum rau siab - ib puag ncig muaj kuab paug los yog ntev - lub sij hawm ruaj khov yaj cov pa ntsuas, xws li kev saib xyuas ib puag ncig |
Xaus
Cov pa oxygen dissolved yog qhov tseem ceeb rau kev saib xyuas thiab tswj xyuas cov dej zoo hauv ntau qhov kev lag luam, suav nrog kev kho dej, kev saib xyuas ib puag ncig, aquaculture, thiab kev lag luam. Kev nkag siab txog cov txheej txheem ntsuas thiab xaiv lub sensor raws li daim ntawv thov- cov kev cai tshwj xeeb tuaj yeem pab txhim kho cov txheej txheem, txhim kho kev ua haujlwm zoo, thiab ua kom muaj kev noj qab haus huv ntawm cov dej hauv dej.
Yog tias koj xav paub ntau ntxiv, hu rau peb tus engineer.