Qhov sib txawv tseem ceeb ntawm BOD thiab COD yog tias BOD yog qhov xav tau oxygen ntawm cov kab mob kom oxidize organic teeb meem hauv cov dej hauv qab aerobic thaum COD yog cov pa oxygen xav kom oxidize tag nrho cov pa phem hauv dej tshuaj.
Qhov zoo ntawm cov qauv dej muab nyob ntawm qee yam sib txawv. Tsis tas li ntawd, nws tuaj yeem muab faib ua ntau txoj hauv kev xws li lom neeg, lub cev thiab tshuaj lom neeg. Lawv yog cov pH, turbidity, microorganisms, yaj-oxygen ntsiab lus, thiab yaj-nutrients. Lub ntsiab parameter, uas tuaj yeem cuam tshuam cov dej zoo, yog cov dej muaj pes tsawg leeg. Feem ntau dej muaj cov pa roj carbon monoxide, inorganic ions, organic compounds, cov kab mob muaj sia thiab qee cov tshuaj lom neeg sib txuas. Cov muaj pes tsawg leeg sib txawv nyob ntawm qhov sib txawv xws li qhov kub thiab txias, qhov chaw thiab theem ntawm cov pa phem, thiab lwm yam. Cov pa oxygen xav tau yog ib txoj hauv kev zoo tshaj plaws los ntsuas cov dej zoo. Ob qho tib si lom neeg xav tau oxygen (BOD) thiab tshuaj lom neeg oxygen xav tau (COD) tab tom los ntawm qhov tshwm sim. Lub hom phiaj tseem ceeb ntawm tsab xov xwm no yog muab lub tswv yim meej txog ob qho tib si ntawm lub tswv yim, qhov sib xws, qhov sib txawv, thiab kev siv tswv yim ntawm lawv.
BOD yog dab tsi?
BOD yog cov ntawv luv ntawm cov pa oxygen xav tau hauv dej. Nws tseem hu ua biochemical oxygen xav tau. Muaj kev sib raug zoo ntawm cov organic teeb meem, cov neeg microbial thiab cov ntsiab lus oxygen yaj hauv dej. Aerobic microorganisms xav tau oxygen rau lawv cov metabolism. Yog li, lawv siv cov pa oxygen yaj thiab hloov cov khoom organic rau hauv lub zog. Ntxiv mus, lawv siv lub zog muab los ntawm cov zaub mov organic, rau lawv cov kev cuam tshuam metabolic ntxiv thiab tshwj xeeb tshaj yog rau lawv cov me nyuam. Yog li, cov pej xeem ceev tau nce ntxiv txog lub zog tau txais, tab sis nws nyob ntawm cov khoom noj muaj. Qhov kev xav tau metabolic rau cov neeg tsim tshiab dua tsim qhov kev thov rau cov pa oxygen, uas yog proportional rau cov zaub mov muaj.
Daim duab 01: BOD Test
Yog li ntawd, kev xav tau cov pa roj ntsha lom neeg yog qhov xav tau ntawm cov pa oxygen uas xav tau los ntawm cov kab mob aerobic los rhuav tshem cov ntaub ntawv organic, kom tau txais lub zog rau lawv cov metabolism. Tus nqi no yuav tsum tau sim nyob rau hauv qhov ntsuas kub rau ib lub sijhawm, thiab nws yuav nyob ntawm seb cov khoom noj muaj pes tsawg leeg thiab cov tshuaj tiv thaiv enzymatic ib yam nkaus. Tsis tas li ntawd, tus nqi BOD hauv cov dej qias neeg feem ntau siab dua cov dej tshiab. BOD siab tuaj yeem yog qhov tshwm sim vim cov dej phwj tuaj hauv tsev, roj av seem thiab khib nyiab ntawm tsiaj thiab qoob loo.
COD yog dab tsi?
Tshuaj lom neeg xav tau (COD) yog ib txoj hauv kev tsis ncaj ncees ntawm kev txiav txim siab tag nrho cov organic tebchaw hauv dej. Li no, COD hais txog cov pa oxygen uas tsim nyog los oxidize tag nrho cov organic carbon tag nrho rau CO2 thiab H2O. Tsis tsuas yog COD koom nrog cov decomposition ntawm cov organic teeb meem, tab sis kuj, nws muaj feem xyuam rau oxidation ntawm inorganic tshuaj (ammonia thiab nitrite). Nws tau piav qhia raws li lub peev xwm ntawm dej, kom haus cov pa oxygen hauv ob qho tib si.
Daim duab 02: Organic Pollution
Ntxiv mus, COD kuaj siv tshuaj reagent los oxidize cov pa phem. Yog li ntawd, nws tsis cia siab rau kev siv cov kab mob me me los rhuav tshem cov organic hauv cov qauv los ntawm kev ua pa aerobic. Tsis tas li ntawd xwb, COD ib txwm muaj kev sib piv rau BOD vim tias COD yog qhov ntsuas ntawm kev ua kom tiav cov pa phem, tsis zoo li BOD uas feem ntau biochemical puas tsis ua tiav raws li cov tshuaj lom neeg tawg.
Dab tsi yog qhov zoo sib xws ntawm BOD thiab COD?
- COD thiab BOD tuaj yeem qhia tau li mg / L lossis ppm (ib feem ntawm lab).
- Ob qhov ntsuas ntsuas cov pa oxygen xav tau los oxidize cov pa phem hauv dej.
- Tsis tas li, ob qhov kev ntsuas qhia qhov hnyav ntawm cov dej qias neeg.
- Tsis tas li ntawd, ob qho tib si BOD thiab COD yog qhov tseem ceeb hauv cov dej khib nyiab rau kev txiav txim siab cov khib nyiab hauv dej.
Qhov txawv ntawm BOD thiab COD yog dab tsi?
BOD yog hais txog cov pa oxygen uas siv los ntawm cov kab mob kom decompose organic teeb meem hauv dej hauv cov xwm txheej aerobic. Ntawm qhov tod tes, COD hais txog cov pa oxygen xav tau los oxidize tag nrho cov organic thiab inorganic kuab paug hauv dej tshuaj. Yog li, qhov no yog qhov sib txawv tseem ceeb ntawm BOD thiab COD.
Tsis tas li ntawd, COD kuaj siv lub zog oxidizing reagent los oxidize cov ntaub ntawv hauv dej thaum BOD kuaj tsis siv tshuaj reagent hloov nws tso cai rau cov kab mob ua rau cov organic teeb meem. Yog li, nws kuj yog qhov sib txawv ntawm BOD thiab COD. Lwm qhov sib txawv ntawm BOD thiab COD yog tias nws muaj peev xwm ua kom tiav COD xeem hauv ob peb teev hauv chav kuaj. Tab sis, kev xeem BOD siv sijhawm tsib hnub. Ntxiv mus, txij li COD ntsuas cov pa oxygen tsim nyog los oxidize tag nrho cov pa phem, COD tus nqi yeej ib txwm ntau dua li tus nqi BOD. Tsis tas li ntawd, hauv COD, kev tawg ua tiav ntawm cov pa phem tshwm sim thaum nws tsis tshwm sim hauv BOD.
Cov lus qhia hauv qab no ntawm qhov sib txawv ntawm BOD thiab COD piav qhia qhov sib txawv ntawm qhov sib piv.
Summary – BOD vs COD
BOD thiab COD yog ob qhov ntsuas los ntsuas dej zoo thiab qhov muaj kuab paug ntawm cov dej. BOD ntsuas cov pa oxygen siv los ntawm cov kab mob aerobic los rhuav tshem cov organic hauv dej. Ntawm qhov tod tes, COD ntsuas cov pa oxygen xav tau los oxidize tag nrho cov organic thiab inorganic pollutants nyob rau hauv dej tshuaj yam tsis muaj kev koom tes ntawm microbes. Yog li, qhov no yog qhov sib txawv tseem ceeb ntawm BOD thiab COD. Ntxiv mus, COD yeej ib txwm siab dua BOD. Txij li thaum COD siv cov oxidizing muaj zog, nws oxidizes cov pa phem tag nrho rau hauv CO2 thiab H2O tsis zoo li hauv BOD. BOD yog qhov kev xeem siv sijhawm thaum COD tuaj yeem ua tiav hauv ob peb teev. Yog li, qhov no qhia txog qhov sib txawv ntawm BOD thiab COD.
