Tsebo ka sehlahlobi sa COD BOD

BOD le COD li lekanngoa joang?

Ho na le mekhoa e 'maloa e ka sebelisoang ho lekanya BOD (Biological Oxygen Demand) le COD (Chemical Oxygen Demand) ka metsing. Mona ke kakaretso e khutšoanyane ea mekhoa e 'meli e meholo:

Mokhoa oa ho hlapolla: Mokhoeng oa ho hlapolla, bophahamo ba metsi bo tsejoang bo hlapolloa ka metsi a itseng a hlapollang, a nang le maemo a tlase haholo a lintho tse phelang. Sampole e hlapollotsoeng e ntan'o beoa ka nako e itseng (hangata matsatsi a 5) mochesong o laoloang (hangata 20°C). Bongata ba oksijene sampoleng bo lekanngoa pele le ka mor'a ho beoa. Phapang ea bongata ba oksijene pele le ka mor'a ho beoa e sebelisoa ho bala BOD ea sampole.

Ho lekanya COD, ho latelwa mokhoa o tšoanang, empa sampole e phekoloa ka sesebelisoa sa lik'hemik'hale se oxidizing (joalo ka potassium dichromate) ho e-na le ho futhumatsoa. ​​Khakanyo ea oksijene e jeoang ke karabelo ea lik'hemik'hale e sebelisoa ho bala COD ea sampole.

Mokhoa oa Respirometer: Mokhoeng oa respirometer, setshelo se koetsoeng (se bitsoang respirometer) se sebelisoa ho lekanya tšebeliso ea oksijene ea likokoana-hloko ha li ntse li qhaqha lintho tse phelang sampole ea metsi. Khakanyo ea oksijene ka har'a respirometer e lekanngoa ka nako e itseng (hangata matsatsi a 5) mochesong o laoloang (hangata 20°C). BOD ea sampole e baloa ho latela sekhahla seo khakanyo ea oksijene e fokotsehang ka sona ha nako e ntse e ea.

Mokhoa oa ho hlapolla le mokhoa oa respirometer ka bobeli ke mekhoa e tloaelehileng e sebelisoang lefatšeng ka bophara ho lekanya BOD le COD ka metsing.

Moeli oa BOD le COD ke ofe?

BOD (Tlhokomeliso ea Oksijene ea Baeloji) le COD (Tlhokomeliso ea Oksijene ea Lik'hemik'hale) ke litekanyo tsa bongata ba oksijene e hlokahalang ho qhaqha lintho tse phelang ka metsing. Maemo a BOD le COD a ka sebelisoa ho lekola boleng ba metsi le tšusumetso e ka bang teng ea ho ntša metsi a litšila metsing a tlhaho.

Meeli ea BOD le COD ke litekanyetso tse sebelisoang ho laola maemo a BOD le COD metsing. Meeli ena hangata e beoa ke mekhatlo ea taolo 'me e thehiloe maemong a amohelehang a lintho tse phelang metsing a ke keng a ba le tšusumetso e mpe tikolohong. Meeli ea BOD le COD hangata e hlahisoa ka limiligrama tsa oksijene ka litara ea metsi (mg/L).

Meeli ea BOD e sebelisoa ho laola bongata ba lintho tse phelang metsing a litšila a tšolotsoeng metsing a tlhaho, joalo ka linoka le matša. Maemo a phahameng a BOD metsing a ka fokotsa oksijene metsing le ho senya bophelo ba metsing. Ka lebaka leo, lifeme tsa kalafo ea metsi a litšila lia hlokahala ho fihlela meeli e itseng ea BOD ha li ntša metsi a tsona a litšila.

Meeli ea COD e sebelisoa ho laola maemo a lintho tse phelang le litšila tse ling metsing a litšila a indasteri. Maemo a phahameng a COD metsing a ka bontša boteng ba lintho tse chefo kapa tse kotsi, 'me a ka boela a fokotsa oksijene metsing le ho senya bophelo ba metsing. Hangata libaka tsa indasteri lia hlokahala ho fihlela meeli e itseng ea COD ha li ntša metsi a tsona a litšila.

Ka kakaretso, meeli ea BOD le COD ke lisebelisoa tsa bohlokoa bakeng sa ho sireletsa tikoloho le ho netefatsa boleng ba metsi metsing a tlhaho.