Ulwazi malunga nohlalutyo lwe-COD BOD

I-BOD kunye ne-COD zilinganiswa njani?

Kukho iindlela ezahlukeneyo ezinokusetyenziswa ukulinganisa i-BOD (iMfuno yeOksijini yeBiological) kunye ne-COD (iMfuno yeOksijini yeChemical) emanzini. Nantsi ingcaciso emfutshane yeendlela ezimbini eziphambili:

Indlela yokuxuba: Kwindlela yokuxuba, umthamo wamanzi owaziwayo uxutywa ngamanzi athile axutyiweyo, aqulathe amanqanaba aphantsi kakhulu ezinto eziphilayo. Isampuli exutyiweyo emva koko ifakwa kwi-incubator ixesha elithile (ngesiqhelo iintsuku ezi-5) kubushushu obulawulwayo (ngesiqhelo ngama-20°C). Uxinzelelo lwe-oksijini kwisampuli lulinganiswa ngaphambi nasemva kokufakelwa. Umahluko kuxinzelelo lwe-oksijini ngaphambi nasemva kokufakelwa usetyenziselwa ukubala i-BOD yesampuli.

Ukulinganisa i-COD, kulandelwa inkqubo efanayo, kodwa isampuli inyangwa nge-chemical oxidizing agent (efana ne-potassium dichromate) endaweni yokuba ifakwe kwi-incubate. Uxinzelelo lwe-oxygen olusetyenziswa yi-chemical reaction lusetyenziselwa ukubala i-COD yesampuli.

Indlela yeRespirometer: Kwindlela yeRespirometer, isitya esivaliweyo (esibizwa ngokuba yiRespirometer) sisetyenziselwa ukulinganisa ukusetyenziswa kweoksijini kwiintsholongwane njengoko ziqhekeza izinto eziphilayo kwisampuli yamanzi. Uxinzelelo lweoksijini kwiRespirometer lulinganiswa kwixesha elithile (ngesiqhelo iintsuku ezi-5) kubushushu obulawulwayo (ngesiqhelo ngama-20°C). I-BOD yesampuli ibalwa ngokusekelwe kwisantya apho uxinzelelo lweoksijini luncipha khona ngokuhamba kwexesha.

Zombini indlela yokuxuba kunye nendlela ye-respirometer ziindlela ezimiselweyo ezisetyenziswa kwihlabathi liphela ukulinganisa i-BOD kunye ne-COD emanzini.

Yintoni umda we-BOD kunye ne-COD?

I-BOD (iMfuno yeOksijini yeBiological) kunye ne-COD (iMfuno yeOksijini yeKhemikhali) ziindlela zokulinganisa ubungakanani beoksijini efunekayo ukuqhekeza izinto eziphilayo emanzini. Amanqanaba e-BOD kunye ne-COD angasetyenziselwa ukuvavanya umgangatho wamanzi kunye nempembelelo enokubakho yokukhupha amanzi amdaka kwimizimba yendalo yamanzi.

Imida ye-BOD kunye ne-COD yimigangatho esetyenziselwa ukulawula amanqanaba e-BOD kunye ne-COD emanzini. Le mida idla ngokubekwa ziiarhente ezilawulayo kwaye isekelwe kumanqanaba amkelekileyo ezinto eziphilayo emanzini angasayi kuba nefuthe elibi kwindalo esingqongileyo. Imida ye-BOD kunye ne-COD idla ngokubonakaliswa kwii-milligrams zeoksijini ngelitha yamanzi (mg/L).

Imida ye-BOD isetyenziselwa ukulawula ubungakanani bezinto eziphilayo emanzini amdaka akhutshelwa kwimizimba yendalo yamanzi, njengemilambo namachibi. Amanqanaba aphezulu e-BOD emanzini anokunciphisa umxholo weoksijini emanzini kwaye onakalise ubomi basemanzini. Ngenxa yoko, izityalo zonyango lwamanzi amdaka kufuneka zihlangabezane nemida ethile ye-BOD xa zikhupha ukungcola kwazo.

Imida ye-COD isetyenziselwa ukulawula amanqanaba ezinto eziphilayo kunye nezinye izinto ezingcolisayo emanzini amdaka emizi-mveliso. Amanqanaba aphezulu e-COD emanzini anokubonisa ukuba kukho izinto ezinobungozi okanye eziyingozi, kwaye anokunciphisa umxholo weoksijini emanzini kwaye onakalise ubomi basemanzini. Izakhiwo zoshishino zihlala zifuneka ukuba zihlangabezane nemida ethile ye-COD xa zikhupha amanzi azo amdaka.

Lilonke, imida ye-BOD kunye ne-COD zizixhobo ezibalulekileyo zokukhusela okusingqongileyo nokuqinisekisa umgangatho wamanzi kwimizimba yendalo yamanzi.