Hauv cov txheej txheem kev kho dej phwj tuaj, txhawm rau ua kom tiav qhov tso tawm ntawm cov dej kho, cov khoom siv saib xyuas dej zoo yuav raug siv los txheeb xyuas cov dej zoo hauv txhua qhov txuas ntawm kev kho dej phwj tuaj. Raws li cov ntaub ntawv ntsuas los ntawm cov khoom siv ntsuas dej zoo, cov txheej txheem kev kho mob raug coj los ua kom qhov txuas no Cov dej ntsuas ntsuas tau raws li qhov yuav tsum tau ua, thiab tom qab ntawd nkag mus rau qhov txuas txuas txuas ntxiv. Ntawm cov ntsuas ntsuas dej zoo, ob qhov ntsuas tau hnov thiab tseem ceeb tshaj plaws yog COD thiab BOD. Yog li dab tsi yog qhov txawv thiab kev sib txuas ntawm ob qho no? Zero nrug qhia rau koj paub tias vim li cas COD thiab BOD feem ntau siv hauv cov ntsuas dej paug, thiab qhov sib txawv thiab kev sib txuas ntawm COD thiab BOD.
COD yog dab tsi?
COD (Chemical Oxygen Demand): Nws yog tus nqi ntawm cov oxidant noj thaum muaj cov oxidant muaj zog siv los kho cov qauv dej hauv qee yam mob. Nws qhia txog qhov muaj kuab paug nyob hauv dej. Qhov ntau dua cov tshuaj oxygen xav tau, qhov hnyav dua cov pa phem ntawm cov organic hauv dej. COD qhia hauv mg/L. Tus nqi ntawm COD kuaj pom los ntawm cov khoom siv saib xyuas dej zoo tuaj yeem muab faib ua tsib pawg. Ntawm lawv, hom thawj thiab thib ob ntawm COD tsawg dua lossis sib npaug li 15 mg / L, uas tuaj yeem ua tau raws li tus qauv dej haus, thiab tus nqi ntau dua li hom dej thib ob. Cov uas tsis tuaj yeem siv los ua dej haus, ntawm peb hom COD Tsawg dua lossis sib npaug li 20mg / L, plaub hom COD Tsawg dua lossis sib npaug li 30mg / L, thiab tsib hom COD Tsawg dua lossis sib npaug li 40mg / L belongs rau cov dej tsis zoo. Qhov siab dua tus nqi COD, qhov ua paug hnyav dua.
BOD yog dab tsi?
BOD (Biochemical Oxygen Demand): yog hais txog qhov loj ntawm cov pa oxygen uas xav tau hauv cov txheej txheem biochemical ntawm cov kab mob hauv dej kom decompose organic teeb meem nyob rau hauv aerobic tej yam kev mob. Txhawm rau ua kom qhov ntsuas qhov ntsuas ntawm BOD sib piv, lub sijhawm feem ntau tau teev tseg, thiab ntsuas cov pa oxygen hauv dej. Feem ntau, tsib hnub siv, hu ua tsib hnub biochemical oxygen xav tau, uas tau sau tseg ua BOD5, thiab tsib hnub biochemical oxygen xav tau feem ntau siv. . Qhov loj dua tus nqi BOD, ntau cov organic teeb meem muaj nyob rau hauv dej, thiab yog li ntawd qhov ua paug loj dua.
BOD yog qhov ntsuas qhov ntsuas ib puag ncig siv los saib xyuas cov pa phem ntawm cov organic hauv dej. Organic teeb meem tuaj yeem decomposed los ntawm cov kab mob. Oxygen tau noj hauv cov txheej txheem no. Yog tias cov pa oxygen yaj hauv dej tsis txaus los muab cov kev xav tau ntawm cov kab mob, lub cev dej yuav cuam tshuam nrog lub xeev muaj kuab paug.
BOD yog qhov ntsuas qhov ntsuas ib puag ncig siv los saib xyuas cov pa phem ntawm cov organic hauv dej. Organic teeb meem tuaj yeem decomposed los ntawm cov kab mob. Oxygen tau noj hauv cov txheej txheem no. Yog tias cov pa oxygen yaj hauv dej tsis txaus los muab cov kev xav tau ntawm cov kab mob, lub cev dej yuav cuam tshuam nrog lub xeev muaj kuab paug.
Kev sib raug zoo ntawm COD thiab BOD yog dab tsi?
Hauv cov txheej txheem kev kho dej phwj tuaj, muaj ntau pua ntawm cov organic tshuaj, thiab kev tshuaj xyuas cov organic tshuaj ib zaug ib zaug yuav siv sijhawm thiab tshuaj. Tom qab kev tshawb fawb, nws pom tau tias tag nrho cov organic tshuaj muaj ob yam zoo sib xws. Ib qho yog tias lawv txhua tus muaj cov hydrocarbons. Lwm qhov yog tias feem ntau cov khoom siv organic tuaj yeem raug oxidized los yog oxidized los ntawm cov kab mob. Lawv cov pa roj carbon thiab hydrogen tsim tsis muaj tshuaj lom nrog oxygen. Tsis muaj teeb meem carbon dioxide thiab dej. Cov organic teeb meem hauv cov dej phwj tuaj siv cov pa oxygen ob qho tib si hauv cov txheej txheem tshuaj oxidation lossis hauv cov txheej txheem oxidation lom. Qhov ntau cov organic teeb meem hauv cov dej khib nyiab, cov pa oxygen ntau dua. Muaj kev sib raug zoo ncaj qha ntawm ob. Yog li ntawd, cov pa oxygen noj los ntawm cov tshuaj oxidation ntawm cov dej phwj yog hu ua COD (Chemical Oxygen Demand), thiab cov pa oxygen noj los ntawm oxidation ntawm cov kab mob hauv cov dej phwj yog hu ua BOD (Oxygen Demand for Gas).
Txij li thaum COD (Chemical Oxygen Demand) thiab BOD (Oxygen Demand for Gas) tuaj yeem cuam tshuam txog qhov ntau ntawm tag nrho cov organic tshuaj hauv dej, kuj tseem muaj ntau yam cuab yeej tshawb nrhiav, txoj kev tshawb nrhiav tau yooj yim, thiab cov txiaj ntsig tshawb pom tuaj yeem tau txais hauv ib lub sij hawm luv luv. Yog li ntawd, nws tau siv dav hauv kev tshawb nrhiav thiab tshuaj xyuas dej zoo, thiab nws tau dhau los ua qhov taw qhia tseem ceeb ntawm kev saib xyuas dej zoo thiab lub hauv paus tseem ceeb rau kev saib xyuas ib puag ncig ntawm lub cev dej. Peb tau hnov kev sib piv hauv kev kho dej phwj tuaj.
Qhov tseeb, COD (Chemical Oxygen Demand) tsis tsuas yog cuam tshuam nrog cov organic tshuaj hauv dej, tab sis kuj sawv cev rau cov khoom tsis muaj zog nrog txo cov khoom hauv dej, xws li sulfides, ferrous ions, thiab sodium sulfite. Piv txwv li, yog tias cov ferrous ions hauv cov dej phwj tuaj tsis raug tshem tawm tag nrho hauv lub tank neutralization, yuav muaj ferrous ions nyob rau hauv cov dej phwj ntawm biochemical kev kho mob, thiab COD (tshuaj oxygen xav tau) ntawm cov effluent yuav dhau tus qauv.
Qee cov organic teeb meem hauv cov dej phwj tuaj yeem ua rau lom neeg oxidized (xws li qabzib thiab ethanol), thiab qee qhov tsuas tuaj yeem ua rau qee qhov degradation los ntawm lom oxidation (xws li methanol), thiab qee cov organic teeb meem tsis tuaj yeem degraded los ntawm lom oxidation, thiab qee qhov Toxicity (xws li methanol). Qee cov surfactants). Ua li no, cov organic teeb meem hauv cov dej phwj tuaj yeem muab faib ua ob ntu, biodegradable thiab tsis biodegradable organic teeb meem. Kev lig kev cai, COD (tshuaj oxygen xav tau) yeej txhais tau tias tag nrho cov organic teeb meem hauv cov dej phwj tuaj, BOD (oxygen thov rau gasification) yog cov organic teeb meem uas tuaj yeem biodegraded hauv dej phwj, yog li qhov sib txawv ntawm COD thiab BOD tuaj yeem qhia tau tias cov dej phwj tuaj yeem tsis tuaj yeem biodegradable. Ntawm cov organic.