Nkhani - Kodi muyeso wa COD ndi BOD ndi wofanana?

Kodi miyezo ya COD ndi BOD ndi yofanana?

Ayi, COD ndi BOD si lingaliro lofanana; komabe, ndizogwirizana kwambiri.
Zonsezi ndi zinthu zofunika kwambiri zomwe zimagwiritsidwa ntchito poyesa kuchuluka kwa zinthu zoipitsa zamoyo m'madzi, ngakhale kuti zimasiyana malinga ndi mfundo zoyezera ndi kukula kwake.

Zotsatirazi zikufotokoza mwatsatanetsatane kusiyana kwawo ndi ubale wawo:

1. Kufunika kwa Oxygen ya Mankhwala (COD)

· Tanthauzo: COD imatanthauza kuchuluka kwa mpweya wofunikira kuti upangitse kuti zinthu zonse zamoyo zilowe m'madzi pogwiritsa ntchito mankhwala amphamvu oxidizing, omwe nthawi zambiri amakhala potassium dichromate, pansi pa acidity yolimba. Imafotokozedwa mu ma milligram a mpweya pa lita imodzi (mg/L).
· Mfundo: Kusungunuka kwa mankhwala. Zinthu zachilengedwe zimasungunuka kwathunthu kudzera mu reagents za mankhwala pansi pa kutentha kwambiri (pafupifupi maola awiri).
· Zinthu zoyezedwa: COD imayesa pafupifupi mankhwala onse achilengedwe, kuphatikizapo zinthu zomwe zimawola komanso zomwe sizimawola.

Makhalidwe:
· Kuyeza mwachangu: Zotsatira nthawi zambiri zimatha kupezeka mkati mwa maola 2-3.
· Kuyeza kwakukulu: Mitengo ya COD nthawi zambiri imaposa mitengo ya BOD chifukwa njirayo imawerengera zinthu zonse zomwe zimasungunuka ndi okosijeni.
· Sichikhala ndi chidziwitso chapadera: COD singathe kusiyanitsa pakati pa zinthu zachilengedwe zomwe zimawola ndi zomwe sizimawola.

2. Kufunika kwa Oxygen ya Biochemical (BOD)

· Tanthauzo: BOD imatanthauza kuchuluka kwa mpweya wosungunuka womwe umadyedwa ndi tizilombo toyambitsa matenda panthawi yowola kwa zinthu zachilengedwe zomwe zimawola m'madzi pansi pa mikhalidwe inayake (nthawi zambiri 20 °C kwa masiku 5, otchedwa BOD₅). Imafotokozedwanso mu ma milligrams pa lita imodzi (mg/L).
· Mfundo: Kusungunuka kwa zinthu zachilengedwe. Kuwonongeka kwa zinthu zachilengedwe ndi tizilombo toyambitsa matenda kumatsanzira njira yachilengedwe yodziyeretsa yomwe imachitika m'madzi.
· Zinthu zoyezedwa: BOD imayesa gawo lokha la zinthu zachilengedwe zomwe zingawonongeke mwachilengedwe.

Makhalidwe:
· Nthawi yayitali yoyezera: Nthawi yoyezera yokhazikika ndi masiku 5 (BOD₅).
· Imawonetsa momwe zinthu zachilengedwe zimakhalira: Imathandiza kuzindikira momwe mpweya umagwiritsidwira ntchito m'chilengedwe.
· Kuchuluka kwapadera: BOD imayankha kokha ku zinthu zachilengedwe zomwe zimatha kuwola.

3. Kulumikizana ndi Kugwiritsa Ntchito Mwachangu

Ngakhale kuti pali kusiyana, COD ndi BOD nthawi zambiri zimasanthulidwa pamodzi ndipo zimagwira ntchito yofunika kwambiri pakuwunika ubwino wa madzi ndi kuchiza madzi otayidwa:

1) Kuwunika kuwonongeka kwa zinthu:
Chiŵerengero cha BOD/COD chimagwiritsidwa ntchito nthawi zambiri poyesa kuthekera kwa njira zochizira matenda achilengedwe (monga, njira yothira matope).
· BOD/COD > 0.3: Imasonyeza kuti zinthu zitha kuwonongeka bwino, zomwe zikusonyeza kuti chithandizo chachilengedwe ndi choyenera.
· BOD/COD < 0.3: Zimasonyeza kuchuluka kwa zinthu zachilengedwe zomwe sizingathe kuwonongeka komanso kuwonongeka kwachilengedwe. Muzochitika zotere, njira zochizira zisanachitike (monga, kusungunuka kwapamwamba kapena kugawanika kwa madzi) zingafunike kuti ziwonjezeke kuwonongeka kwachilengedwe, kapena njira zina zochizira thupi ndi mankhwala zingakhale zofunikira.

2) Zochitika zogwiritsira ntchito:
· BOD: Amagwiritsidwa ntchito makamaka poyesa momwe madzi otayira amakhudzira chilengedwe pa madzi achilengedwe, makamaka pankhani ya kuchepa kwa mpweya ndi kuthekera kwake kupha zamoyo zam'madzi.
· COD: Imagwiritsidwa ntchito kwambiri poyang'anira mwachangu kuchuluka kwa kuipitsidwa kwa madzi otayidwa m'mafakitale, makamaka pamene madzi otayidwa ali ndi zinthu zoopsa kapena zosawonongeka. Chifukwa cha kuthekera kwake koyezera mwachangu, COD nthawi zambiri imagwiritsidwa ntchito poyang'anira nthawi yeniyeni komanso kuwongolera njira m'makina oyeretsera madzi otayidwa.

Chidule cha Kusiyana Kwakukulu

Khalidwe	COD (Kufunika kwa Mpweya wa Oxygen)	BOD (Kufunika kwa Oxygen ya Biochemical)
Mfundo yaikulu	Kusungunuka kwa mankhwala	Kusungunuka kwa zamoyo (ntchito ya tizilombo toyambitsa matenda)
Oxidant	Mankhwala amphamvu ophera okosijeni (monga potaziyamu dichromate)	Tizilombo toyambitsa matenda a aerobic
Kuchuluka kwa muyeso	Zimaphatikizapo zinthu zonse zachilengedwe zomwe zimasungunuka ndi okosijeni (kuphatikizapo zosawonongeka)	Zinthu zachilengedwe zokha zomwe zimawola
Nthawi yoyesera	Mfupi (maola 2–3)	Kutalika (masiku 5 kapena kuposerapo)
Ubale wa manambala	COD ≥ BOD	BOD ≤ COD

Mapeto:

COD ndi BOD ndi zizindikiro zowonjezera poyesa kuipitsidwa kwa zinthu zachilengedwe m'madzi osati miyeso yofanana. COD ikhoza kuonedwa ngati "kufunikira kwakukulu kwa mpweya" kwa zinthu zonse zachilengedwe zomwe zilipo, pomwe BOD imasonyeza "kuthekera kwenikweni kogwiritsa ntchito mpweya" pansi pa zochitika zachilengedwe.

Kumvetsetsa kusiyana ndi mgwirizano pakati pa COD ndi BOD ndikofunikira popanga njira zogwirira ntchito zoyeretsera madzi akuda, kuwunika ubwino wa madzi, ndikukhazikitsa miyezo yoyenera yotulutsira madzi.

TP TN CODMn Nitrate nayitrogeni COD BOD Ammonia nayitrogeni chowunikira

Kampani ya Shanghai Boqu Instrument Co., Ltd. imagwira ntchito yopereka mitundu yonse ya ma COD ndi ma BOD pa intaneti omwe amagwira ntchito bwino kwambiri. Zipangizo zathu zanzeru zowunikira zimathandiza kuyang'anira nthawi yeniyeni komanso molondola, kutumiza deta yokha, komanso kuyang'anira pogwiritsa ntchito mitambo, motero zimathandiza kukhazikitsa bwino njira yowunikira madzi yakutali komanso yanzeru.

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Nthawi yotumizira: Sep-10-2025