Cov pa roj carbon activated puas tuaj yeem txo COD?

Ua ntej tshaj plaws, txhawm rau nkag siab zoo dua cov txiaj ntsig tshem tawm ntawm cov pa roj carbon activated ntawm COD, peb yuav tsum nkag siab meej lub ntsiab lus ntawm COD thiab BOD, ob qhov ntsuas ntsuas dej zoo. COD thiab BOD yog ob qho tib si ntsuas rau ntsuas qhov ntsuas ntawm cov pa phem hauv dej, thiab lawv cuam tshuam txog lub peev xwm ntawm cov dej kom haus cov pa hauv qee qhov xwm txheej.

COD (Chemical Oxygen Demand): Nws qhia txog cov pa oxygen xav tau rau txhua qhov oxidizable organic teeb meem hauv dej hauv qab kev ua ntawm cov oxidants muaj zog. Hauv ntej, COD qhia txog tag nrho cov kuab paug organic hauv dej. COD tus nqi siab dua, cov organic pollutants muaj nyob hauv dej ntau dua thiab cov dej tsis zoo.

BOD (biochemical oxygen xav tau): qhia txog cov pa oxygen xav tau rau kev degradation ntawm cov organic teeb meem hauv dej los ntawm cov kab mob hauv qee qhov kub thiab sijhawm. BOD feem ntau qhia txog cov ntsiab lus ntawm biodegradable organic teeb meem hauv dej, uas feem ntau qis dua tus nqi COD.

Txawm hais tias ob qho tib si COD thiab BOD tuaj yeem cuam tshuam txog qib dej paug, COD muaj ntau dua vim tias nws suav nrog txhua yam oxidizable organic teeb meem, txawm tias nws yooj yim degradable lossis nyuaj rau degrade. Yog li ntawd, kev txo qis ntawm COD yog lub hom phiaj tseem ceeb hauv kev kho cov dej phwj tuaj.

Cov pa roj carbon activated yog cov khoom ntxeem tau carbonaceous nrog lub peev xwm adsorption muaj zog heev. Nws tuaj yeem tshem tawm cov organic thiab inorganic teeb meem hauv dej los ntawm lub cev adsorption, tshuaj adsorption thiab lwm txoj hauv kev. Yog li ntawd, activated carbon feem ntau yog siv los txo COD hauv cov dej phwj tuaj kho, tshwj xeeb tshaj yog thaum cuam tshuam nrog qee qhov nyuaj-rau-degrade organic teeb meem, cov nyhuv ntawm cov pa roj carbon activated yog qhov tseem ceeb.

Adsorption mechanism ntawm activated carbon: Lub hauv paus ntsiab lus decontamination ntawm activated carbon yog tsuas yog adsorb organic teeb meem nyob rau hauv dej los ntawm ib tug loj tus naj npawb ntawm micropores thiab mesopores ntawm nws nto. Vim muaj kev sib cuam tshuam ntawm cov organic teeb meem thiab activated carbon, cov organic teeb meem yuav adsorbed rau saum npoo los yog pores ntawm activated carbon, yog li txo tus nqi COD nyob rau hauv dej.

Yam tseem ceeb cuam tshuam rau COD tshem tawm efficiency: Kev tshem tawm cov pa roj carbon activated rau COD cuam tshuam los ntawm ntau yam, feem ntau suav nrog:

Hom activated carbon: Cov pa roj carbon activated ntawm cov duab sib txawv (xws li columnar activated carbon, granular activated carbon, powdered activated carbon) muaj qhov sib txawv pore loj faib thiab adsorption zog, yog li nws cov txiaj ntsig COD tshem tawm kuj txawv, ntawm cov hmoov activated carbon muaj qhov sib txawv. tus nqi tshem tawm zoo tshaj plaws.

Lub sijhawm adsorption: Lub adsorption ntawm cov pa roj carbon activated yog txheej txheem dynamic. Feem ntau, nrog rau ncua sij hawm adsorption, cov nyhuv tshem tawm yuav maj mam nce, tab sis tom qab ib lub sijhawm, nws yuav zoo li saturation thiab tsis tuaj yeem tshem tawm COD.

Tus nqi PH: Cov pH ntawm cov dej muaj qhov cuam tshuam tseem ceeb ntawm cov nyhuv adsorption ntawm cov pa roj carbon activated. Feem ntau hais lus, cov nyhuv adsorption ntawm activated carbon yog zoo dua nyob rau hauv ib tug weakly acidic rau nruab nrab ib puag ncig.

Reaction kub: Qhov nce hauv qhov kub feem ntau nce qhov adsorption tus nqi ntawm cov pa roj carbon activated, tab sis kub dhau heev yuav ua rau cov qauv ntawm cov pa roj carbon activated thiab txo nws cov peev xwm adsorption.

Tus nqi ntawm cov pa roj carbon activated: Tus nqi ntawm cov pa roj carbon activated ncaj qha txiav txim siab nws cov txiaj ntsig hauv kev tshem tawm COD. Nyob rau hauv rooj plaub ntawm COD siab, tus nqi ntawm cov pa roj carbon activated yuav tsum tau nce ntxiv los txhim kho tus nqi tshem tawm.

stirring lub sij hawm: stirring pab cov pa phem nyob rau hauv dej kom tag nrho cov activated carbon, yog li txhim kho cov adsorption efficiency.

Txawm hais tias cov pa roj carbon activated tuaj yeem txo qis COD, nws cov peev txheej ntawm daim ntawv thov tsis txwv. Qhov tseeb, cov nyhuv tshem tawm ntawm cov pa roj carbon activated ntawm COD yog ze ze rau qhov concentration ntawm COD hauv dej. Thaum kho cov dej phwj tuaj nrog COD siab, tso siab rau cov pa roj carbon activated nkaus xwb yuav ua rau cov nqi ntau dhau. Yog li ntawd, cov theem tshwj xeeb ntawm COD yuav tsum tau txiav txim siab thaum xaiv siv cov pa roj carbon activated.

Thaum tus nqi COD qis qis (50-500 mg/L): Rau cov dej phwj tuaj nrog tus nqi COD qis, cov pa roj carbon activated yog ib txoj kev kho mob zoo dua. Lub sijhawm no, cov organic teeb meem hauv cov dej muaj qee qhov nyuaj ntawm degradation, thiab nws yuav tsis ua rau kev siv cov pa roj carbon activated kim heev. Yog li ntawd, kev siv cov pa roj carbon activated nyob rau hauv cov ntaub ntawv no tuaj yeem txo qis COD thaum tswj tus nqi kho mob.

When the COD value is high (>500 mg / L): Thaum tus nqi COD hauv dej siab, cov txiaj ntsig ntawm COD tshem tawm los ntawm cov pa roj carbon activated ib leeg yuav txo qis heev. Nyob rau lub sijhawm no, lub peev xwm adsorption ntawm cov pa roj carbon activated yuav maj mam nce mus txog saturation, thiab tus nqi kho mob kuj tseem nce siab. Yog li ntawd, rau cov dej phwj tuaj nrog tus nqi COD ntau dua 500 mg / L, feem ntau yuav tsum tau siv cov pa roj carbon activated ua ke nrog lwm txoj kev kho mob (xws li kev kho oxidation, membrane pom, kev kho mob lom, thiab lwm yam) los txhim kho tag nrho cov kev kho mob thiab. txo cov nqi.

Raws li tus yam ntxwv degradation ntawm cov organic teeb meem nyob rau hauv dej, ob peb cubic meters ntawm activated carbon feem ntau yog siv nyob rau hauv lub rov qab kawg ntawm cov dej phwj tuaj kho, tshwj xeeb tshaj yog nyob rau hauv lub tom qab theem ntawm kev kho mob, ntxiv tshem tawm cov nyuaj-rau-degrade organic teeb meem nyob rau hauv dej. Cov hauv qab no yog ob peb lub ntsiab lus tseem ceeb rau kev siv cov pa roj carbon activated hauv kev kho dej phwj tuaj:

Pretreatment theem: Thaum tus nqi COD siab, nws yog ib qho tsim nyog yuav tsum xub siv lub cev thiab tshuaj txoj kev (xws li coagulation, nag lossis daus, membrane filtration, thiab lwm yam) rau pretreatment kom txo tau cov COD concentration thiab txo lub nra ntawm activated carbon tom ntej.

Tom qab kev kho mob theem: Thaum cov organic degradable yooj yim nyob rau hauv cov dej tau biodegraded los yog tshem tawm los ntawm lwm txoj kev, activated carbon yuav siv tau ntxiv tshem tawm qhov nyuaj-rau-degrade organic teeb meem, optimize cov dej zoo, thiab txo tus nqi COD. mus rau qhov chaw tsim nyog.

Cov theem kev kho mob sib sib zog nqus: Hauv qee qhov kev lag luam lossis thaj chaw uas xav tau kom ua tau raws li cov qauv COD emission tsawg heev, cov pa roj carbon activated tuaj yeem siv los ua ib feem ntawm kev kho mob sib sib zog nqus kom ntseeg tau tias cov dej tso tawm tau zoo raws li kev tiv thaiv ib puag ncig nruj.

Cov yam ntxwv adsorption ntawm cov pa roj carbon activated ua rau nws ua lub luag haujlwm tseem ceeb hauv kev kho cov dej phwj tuaj, tshwj xeeb tshaj yog nyob rau hauv kev kho mob nyuaj-rau-degrade organic teeb meem. Txawm li cas los xij, seb puas yuav xaiv cov pa roj carbon activated thiab thaum twg siv cov pa roj carbon activated yuav tsum tau txiav txim siab tsim nyog raws li COD concentration ntawm lub cev dej. Rau cov dej phwj tuaj nrog tus nqi COD ntawm 50-500 mg / L, cov pa roj carbon activated muaj txiaj ntsig zoo dua li txoj kev kho mob rov qab, tab sis nyob rau hauv cov ntaub ntawv muaj txiaj ntsig COD siab heev, cov txiaj ntsig kev kho mob ntawm kev cia siab rau cov pa roj carbon activated tsuas yog txwv. , thiab nws yuav tsum tau siv ua ke nrog lwm txoj kev kho mob.

Yog li ntawd, thaum siv cov pa roj carbon activated, COD concentration, hom activated carbon, siv ib puag ncig thiab lwm yam txheej txheem yuav tsum tau txiav txim siab kom ua tiav cov txiaj ntsig zoo.