Kev sib raug zoo ntawm COD thiab BOD

Hais txog COD thiab BOD
Hauv cov ntsiab lus kev tshaj lij
COD sawv cev rau Chemical Oxygen Demand. Chemical Oxygen Demand yog ib qho tseem ceeb ntawm qhov ntsuas dej tsis zoo, siv los qhia txog qhov txo cov tshuaj (feem ntau yog cov organic teeb meem) hauv dej. Kev ntsuas ntawm COD yog xam los ntawm kev siv cov oxidants muaj zog (xws li poov tshuaj dichromate los yog poov tshuaj permanganate) los kho cov qauv dej nyob rau hauv tej yam kev mob, thiab tus nqi ntawm cov oxidants noj tau roughly qhia lub degree ntawm organic teeb meem nyob rau hauv lub cev dej. Qhov loj dua tus nqi COD, qhov hnyav dua lub cev dej yog paug los ntawm cov organic teeb meem.
Txoj kev ntsuas cov tshuaj oxygen xav tau feem ntau suav nrog txoj kev dichromate, txoj kev poov tshuaj permanganate thiab txoj kev nqus ultraviolet tshiab. Ntawm lawv, txoj kev potassium dichromate muaj kev ntsuas siab thiab tsim nyog rau lub sijhawm uas yuav tsum tau muaj qhov tseeb, xws li kev saib xyuas dej khib nyiab; thaum txoj kev poov tshuaj permanganate yog ib qho yooj yim rau kev khiav lag luam, kev lag luam thiab siv tau, thiab tsim nyog rau cov dej saum npoo av, dej thiab dej haus. Kev saib xyuas dej.
Cov laj thawj rau kev xav tau cov pa oxygen ntau dhau yog feem ntau cuam tshuam nrog kev lag luam emissions, dej phwj hauv nroog thiab kev ua liaj ua teb. Organic teeb meem thiab txo cov tshuaj los ntawm cov peev txheej no nkag mus rau hauv lub cev dej, ua rau COD qhov tseem ceeb tshaj tus qauv. Yuav kom tswj tau COD ntau dhau, yuav tsum tau ua kom muaj kev ntsuas kom txo tau cov pa phem los ntawm cov pa phem no thiab ntxiv dag zog rau kev tswj dej paug.
Raws li qhov tshwm sim, cov tshuaj lom neeg cov pa oxygen xav tau yog ib qho tseem ceeb qhia uas qhia txog qib ntawm cov organic kuab paug ntawm lub cev dej. Los ntawm kev siv cov kev ntsuas sib txawv, peb tuaj yeem nkag siab txog cov pa phem ntawm cov dej hauv lub cev thiab tom qab ntawd siv cov kev ntsuas coj los kho.
BOD sawv cev rau Biochemical Oxygen Demand. Biochemical oxygen xav tau  (BOD5) yog ib qho kev qhia dav dav uas qhia txog cov ntsiab lus ntawm cov pa oxygen xav tau xws li cov organic tebchaw hauv dej. Thaum cov organic teeb meem muaj nyob rau hauv dej los rau hauv kev sib cuag nrog huab cua, nws yog decomposed los ntawm aerobic microorganisms thiab ua inorganic los yog gasified. Kev ntsuas ntawm biochemical oxygen xav tau feem ntau yog ua raws li qhov txo qis ntawm cov pa hauv dej tom qab cov tshuaj tiv thaiv ntawm qhov kub thiab txias (20 ° C) rau ib hnub (feem ntau 5 hnub).
Yog vim li cas rau siab biochemical oxygen xav tau yuav muaj xws li cov qib siab ntawm cov organic teeb meem nyob rau hauv dej, uas yog decomposed los ntawm cov kab mob thiab noj ntau cov pa oxygen. Piv txwv li, kev lag luam, kev ua liaj ua teb, dej hauv dej, thiab lwm yam xav tau kom cov biochemical oxygen xav tau tsawg dua 5mg / L, thaum cov dej haus yuav tsum tsawg dua 1mg / L.
Biochemical oxygen thov kev txiav txim siab muaj xws li dilution thiab inoculation txoj kev, nyob rau hauv uas yuav txo tau nyob rau hauv yaj oxygen tom qab diluted dej qauv yog incubated nyob rau hauv ib tug tas li kub incubator ntawm 20 ° C rau 5 hnub yog siv los xam BOD. Tsis tas li ntawd, qhov piv ntawm biochemical oxygen xav tau rau cov tshuaj oxygen xav tau. Cov organic pollutants uas nyuaj rau decompose ua rau muaj kev phom sij ntau dua rau ib puag ncig.
Biochemical oxygen thov load (BOD load) kuj tseem siv los qhia txog cov khoom organic ua tiav ib chav tsev ntim ntawm cov chaw kho dej khib nyiab (xws li cov lim dej lom neeg, cov tso tsheb hlau luam aeration, thiab lwm yam). Nws yog siv los txiav txim qhov ntim ntawm cov chaw kho dej khib nyiab thiab kev ua haujlwm thiab kev tswj xyuas cov chaw. yam tseem ceeb.
COD thiab BOD muaj cov yam ntxwv zoo sib xws, uas yog, lawv tuaj yeem siv los ua qhov qhia dav dav kom pom cov ntsiab lus ntawm cov pa phem hauv dej. Lawv tus cwj pwm ntawm oxidation ntawm cov organic teeb meem yog txawv kiag li.
COD: Bold thiab unrestrained style, feem ntau siv poov tshuaj permanganate los yog poov tshuaj dichromate raws li oxidant, ntxiv los ntawm high-temperature digestion. Nws them sai sai rau txoj kev ceev, raug thiab ruthless, thiab oxidizes tag nrho cov organic teeb meem nyob rau hauv ib tug luv luv lub sij hawm los ntawm spectrophotometric, dichromate tus nqi ntawm cov pa noj yog suav los ntawm kev tshawb nrhiav txoj kev xws li cov txheej txheem, uas yog kaw raws li CODcr thiab CODmn raws li txawv. oxidants. Feem ntau, potassium dichromate feem ntau yog siv los ntsuas cov dej phwj tuaj. Tus nqi COD uas feem ntau hais yog qhov tseeb CODcr tus nqi, thiab poov tshuaj permanganate yog Tus nqi ntsuas rau cov dej haus thiab dej saum npoo hu ua permanganate Performance index, uas kuj yog tus nqi CODmn. Tsis muaj teeb meem dab tsi oxidant siv los ntsuas COD, qhov siab dua tus nqi COD, qhov ua rau muaj kuab paug ntawm lub cev ntau dua.
BOD: Yooj yim hom. Nyob rau hauv cov xwm txheej tshwj xeeb, cov kab mob tau tso siab rau kom decompose biodegradable organic teeb meem hauv dej los xam cov nyiaj ntawm cov pa oxygen uas siv hauv cov tshuaj tiv thaiv biochemical. Them mloog mus rau ib tug step-by-step txheej txheem. Piv txwv li, yog hais tias lub sij hawm rau lom oxidation yog 5 hnub, nws raug kaw raws li tsib hnub ntawm biochemical tshuaj. Oxygen xav tau (BOD5), sib raug zoo BOD10, BOD30, BOD qhia txog tus nqi ntawm biodegradable organic teeb meem hauv dej. Piv nrog rau kev ua phem oxidation ntawm COD, nws yog ib qho nyuaj rau cov kab mob oxidize ib co organic teeb meem, yog li tus nqi BOD tuaj yeem suav hais tias yog cov dej phwj hauv qhov concentration ntawm cov khoom organic uas tuaj yeem biodegraded.
, uas muaj cov ntaub ntawv tseem ceeb rau kev kho dej phwj tuaj, dej tus kheej purification, thiab lwm yam.

COD thiab BOD yog ob qho tib si qhia txog qhov concentration ntawm cov pa phem hauv dej. Raws li qhov piv ntawm BOD5 / COD, qhov taw qhia ntawm biodegradability ntawm cov dej phwj tuaj yeem tau txais:
Cov mis mos yog: BOD5 / COD = (1-α) × (K / V)
Thaum B / C ＞ 0.58, tag nrho biodegradable
B/C = 0.45-0.58 zoo biodegradability
B/C = 0.30-0.45 Biodegradable
0.1B/C＜0.1 Tsis biodegradable
BOD5 / COD = 0.3 feem ntau yog teem raws li qhov qis dua ntawm cov dej phwj tuaj biodegradable.
Lianhua tuaj yeem soj ntsuam cov txiaj ntsig ntawm COD hauv dej tsis pub dhau 20 feeb, thiab tseem tuaj yeem muab ntau yam reagents, xws li hmoov reagents, kua reagents thiab pre-made reagents. Kev ua haujlwm muaj kev nyab xeeb thiab yooj yim, cov txiaj ntsig tau nrawm thiab raug, cov reagent noj me me, thiab cov pa phem me me.
Lianhua tseem tuaj yeem muab ntau yam BOD nrhiav kom pom, xws li cov cuab yeej siv cov txheej txheem biofilm los ntsuas BOD sai sai hauv 8 feeb, thiab BOD5, BOD7 thiab BOD30 uas siv cov txheej txheem sib txawv tsis muaj mercury, uas tsim nyog rau ntau yam kev tshawb nrhiav scenarios.