Kev thov cov pa oxygen, tseem hu ua chemical oxygen noj, lossis COD luv luv, siv cov tshuaj oxidants (xws li potassium dichromate) los oxidize thiab decompose oxidizable tshuaj (xws li cov organic teeb meem, nitrite, ferrous ntsev, sulfides, thiab lwm yam) hauv dej, thiab tom qab ntawd Oxygen noj yog xam raws li tus nqi ntawm cov oxidant residual.Zoo li biochemical oxygen xav tau (BOD), nws yog ib qho tseem ceeb qhia txog qib dej paug.Chav tsev ntawm COD yog ppm lossis mg / L.Qhov tsawg dua tus nqi, qhov qis dua ntawm cov dej qias neeg.Hauv kev kawm txog cov dej qias neeg thiab cov dej khib nyiab hauv kev lag luam, nrog rau kev ua haujlwm thiab kev tswj xyuas cov chaw kho dej khib nyiab, nws yog ib qho tseem ceeb thiab ceev ceev ntsuas COD cov pa phem.
Cov tshuaj lom neeg xav tau (COD) feem ntau yog siv los ua qhov taw qhia tseem ceeb los ntsuas cov ntsiab lus ntawm cov organic hauv dej.Qhov ntau dua cov tshuaj oxygen xav tau, qhov hnyav dua lub cev dej yog qias neeg los ntawm cov khoom organic.Rau kev ntsuas cov tshuaj oxygen xav tau (COD), qhov ntsuas qhov ntsuas sib txawv nyob ntawm qhov txo cov khoom hauv cov qauv dej thiab cov qauv ntsuas.Txoj kev txiav txim siab feem ntau siv tam sim no yog cov txheej txheem acidic poov tshuaj permanganate oxidation thiab potassium dichromate oxidation txoj kev.
Organic teeb meem yog teeb meem heev rau kev lag luam dej.Hais lus nruj me ntsis, cov tshuaj oxygen xav tau kuj suav nrog cov tshuaj tsis muaj zog uas muaj nyob hauv dej.Feem ntau, txij li tus nqi ntawm cov organic teeb meem hauv cov dej khib nyiab ntau ntau dua li cov khoom tsis zoo, cov tshuaj oxygen xav tau feem ntau yog siv los sawv cev rau tag nrho cov organic teeb meem hauv cov dej khib nyiab.Nyob rau hauv cov xwm txheej ntsuas, cov organic teeb meem uas tsis muaj nitrogen hauv dej yog yooj yim oxidized los ntawm poov tshuaj permanganate, thaum cov organic teeb meem uas muaj nitrogen yog nyuaj rau decompose.Yog li, kev siv cov pa oxygen yog qhov tsim nyog rau kev ntsuas cov dej ntuj lossis cov dej khib nyiab uas muaj cov khoom siv oxidized yooj yim, thaum cov dej khib nyiab organic nrog ntau cov khoom siv feem ntau siv los ntsuas cov tshuaj oxygen xav tau.
Qhov cuam tshuam ntawm COD ntawm kev kho dej
Thaum cov dej uas muaj cov organic teeb meem ntau dhau los ntawm cov txheej txheem desalination, nws yuav paug cov ion pauv resin.Ntawm lawv, nws yog qhov tshwj xeeb tshaj yog yooj yim kom paug cov anion pauv resin, yog li txo cov resin pauv peev xwm.Cov teeb meem organic tuaj yeem raug txo los ntawm 50% thaum lub sij hawm ua ntej (coagulation, clarification thiab filtration), tab sis cov organic teeb meem tsis tuaj yeem raug tshem tawm zoo hauv cov txheej txheem desalination.Yog li ntawd, cov dej ua-up feem ntau yog coj mus rau hauv lub boiler kom txo cov pH nqi ntawm boiler dej., ua rau corrosion system;Qee zaum cov organic teeb meem yuav raug coj mus rau hauv chav dej thiab cov dej condensate, txo tus nqi pH, uas tuaj yeem ua rau lub cev corrosion.
Tsis tas li ntawd, ntau cov ntsiab lus ntawm cov organic teeb meem nyob rau hauv lub circulating dej system yuav txhawb microbial reproduction.Yog li ntawd, tsis hais txog desalination, boiler dej los yog circulating dej systems, qhov qis COD, qhov zoo dua, tab sis tam sim no tsis muaj kev sib koom ua ke ntawm cov lej.
Lus Cim: Hauv cov dej txias txias, thaum COD (KMnO4 txoj kev) yog> 5mg / L, cov dej zoo tau pib deterioration.
Qhov cuam tshuam ntawm COD ntawm ecology
Cov ntsiab lus COD siab txhais tau hais tias cov dej muaj ntau cov tshuaj txo qis, feem ntau yog cov kuab paug organic.Qhov siab dua COD, qhov hnyav dua cov organic paug hauv cov dej hauv dej.Qhov chaw ntawm cov organic paug no feem ntau yog tshuaj tua kab, tshuaj nroj tsuag, organic chiv, thiab lwm yam. Yog hais tias tsis kho raws sij hawm, ntau cov organic pollutants yuav adsorbed los ntawm cov sediment nyob rau hauv qab tus dej thiab deposited, ua rau kom cov kab mob mus ntev rau cov dej nyob rau hauv lub ob peb tom ntej no. xyoo.
Tom qab ib tug loj tus naj npawb ntawm cov dej nyob rau hauv lub neej tuag, lub ecosystem nyob rau hauv tus dej yuav maj mam puas.Yog tias tib neeg noj cov kab mob zoo li no hauv dej, lawv yuav nqus cov co toxins ntau ntawm cov kab mob no thiab sau rau hauv lub cev.Cov co toxins no feem ntau yog carcinogenic, deformational, thiab mutagenic, thiab tsis zoo rau tib neeg noj qab haus huv.Tsis tas li ntawd, yog tias cov dej qias neeg tsis zoo siv rau kev siv dej, cov nroj tsuag thiab cov qoob loo yuav raug cuam tshuam thiab loj hlob tsis zoo.Cov qoob loo uas qias neeg no tsis tuaj yeem noj los ntawm tib neeg.
Txawm li cas los xij, kev xav tau cov pa oxygen siab tsis tas yuav txhais tau hais tias yuav muaj kev phom sij saum toj no, thiab qhov kev txiav txim zaum kawg tuaj yeem ncav cuag los ntawm kev txheeb xyuas cov ncauj lus kom ntxaws.Piv txwv li, soj ntsuam cov hom ntawm cov organic teeb meem, dab tsi cuam tshuam rau cov organic teeb meem muaj nyob rau hauv dej zoo thiab ecology, thiab seb lawv puas muaj teeb meem rau tib neeg lub cev.Yog tias tsis muaj kev soj ntsuam ntxaws ntxaws, koj tuaj yeem ntsuas cov tshuaj oxygen xav tau ntawm cov qauv dej dua tom qab ob peb hnub.Yog tias tus nqi poob qis ntau piv nrog tus nqi dhau los, nws txhais tau hais tias cov khoom txo qis hauv dej yog qhov yooj yim degradable organic teeb meem.Xws li cov organic teeb meem yog teeb meem rau tib neeg lub cev thiab Biological txaus ntshai yog me me.
Cov hau kev rau COD degradation dej khib nyiab
Tam sim no, txoj kev adsorption, chemical coagulation method, electrochemical method, ozone oxidation method, biological method, micro-electrolysis, thiab lwm yam yog cov txheej txheem rau COD degradation dej khib nyiab.
COD nrhiav txoj kev
Rapid digestion spectrophotometry, COD nrhiav txoj hauv kev ntawm Lianhua Tuam Txhab, tuaj yeem tau txais qhov tseeb ntawm COD tom qab ntxiv cov reagents thiab zom cov qauv ntawm 165 degrees rau 10 feeb.Nws yog qhov yooj yim rau kev khiav lag luam, muaj cov tshuaj reagent tsawg, muaj kuab paug tsawg, thiab siv hluav taws xob tsawg.
Post lub sij hawm: Feb-22-2024
