Nkhani - Kodi miyeso ya COD ndi BOD ndiyofanana?

Kodi miyeso ya COD ndi BOD ndi yofanana?

Ayi, COD ndi BOD sizofanana; komabe, ndi ogwirizana kwambiri.
Onsewa ndi magawo ofunikira omwe amagwiritsidwa ntchito poyesa kuchuluka kwa zowononga zachilengedwe m'madzi, ngakhale amasiyana malinga ndi miyeso ndi kukula kwake.

Zotsatirazi zikupereka kufotokozera mwatsatanetsatane za kusiyana kwawo ndi maubwenzi awo:

1. Chemical Demand Oxygen (COD)

· Tanthauzo: COD amatanthauza kuchuluka kwa mpweya wofunikira kuti upangitse zinthu zonse zamoyo m'madzi pogwiritsa ntchito mankhwala ophera okosijeni, omwe nthawi zambiri amakhala potassium dichromate, pansi pa acidic kwambiri. Imawonetsedwa mu milligrams ya okosijeni pa lita (mg/L).
Mfundo yofunika: Chemical oxidation. organic zinthu kwathunthu oxidized kudzera mankhwala reagents pansi pa kutentha kwambiri (pafupifupi 2 hours).
· Zinthu zoyezera: COD imayesa pafupifupi zinthu zonse zachilengedwe, kuphatikizapo zinthu zomwe zimatha kuwonongeka komanso zosawonongeka.

Makhalidwe:
· Muyezo wachangu: Zotsatira zimatha kupezeka mkati mwa maola 2-3.
· Muyezo wokulirapo: Miyezo ya COD nthawi zambiri imaposa ma BOD chifukwa njirayo imatengera zinthu zonse zomwe zimatha kukhala ndi okosijeni.
· Ilibe tsatanetsatane: COD siingathe kusiyanitsa pakati pa zinthu zowola ndi zosawonongeka.

2. Kufuna kwa Oxygen kwa Biochemical (BOD)

· Tanthauzo: BOD imatanthawuza kuchuluka kwa mpweya wosungunuka womwe umagwiritsidwa ntchito ndi tizilombo toyambitsa matenda panthawi ya kuwonongeka kwa zinthu zowonongeka m'madzi pansi pa mikhalidwe yapadera (nthawi zambiri 20 °C kwa masiku asanu, otchedwa BOD₅). Amawonetsedwanso mu milligrams pa lita (mg/L).
Mfundo yofunika: Biological oxidation. Kuwonongeka kwa zinthu zachilengedwe ndi tizilombo ta aerobic kumatsanzira njira yachilengedwe yodziyeretsa yomwe imachitika m'madzi.
Zinthu zoyezedwa: BOD imayesa kachigawo kakang'ono kokha ka zinthu zamoyo zomwe zimatha kuwonongeka.

Makhalidwe:
· Nthawi yayitali yoyezera: Nthawi yoyezetsa ndi masiku 5 (BOD₅).
· Imaunikira chilengedwe: Imatipatsa chidziwitso pakugwiritsa ntchito mpweya weniweni wa zinthu zachilengedwe m'malo achilengedwe.
· Kukhazikika kwapamwamba: BOD imayankha kuzinthu zachilengedwe zomwe zimatha kuwonongeka.

3. Kulumikizana ndi Ntchito Zothandiza

Ngakhale kusiyana kwawo, COD ndi BOD nthawi zambiri amawunikidwa palimodzi ndipo amatenga gawo lofunikira pakuwunika kwamadzi komanso kuthira madzi oipa:

1) Kuwunika kwa biodegradability:
Chiyerekezo cha BOD/COD chimagwiritsidwa ntchito pounika kuthekera kwa njira zochiritsira zamoyo (mwachitsanzo, njira ya sludge).
BOD/COD > 0.3: Imawonetsa kuwonongeka kwachilengedwe, kutanthauza kuti chithandizo chachilengedwe ndi choyenera.
BOD/COD <0.3: Imawonetsa kuchuluka kwa zinthu zosagwirizana ndi organic komanso kusawonongeka kwachilengedwe. Zikatero, njira zochiritsira (mwachitsanzo, kutulutsa makutidwe ndi okosijeni apamwamba) kapena kuti coagulation sedimentation) zisafunike kuti ziwonjezeke, kapena njira zina zochizira mankhwala akuthupi zitha kufunikira.

2) Zochitika zogwiritsira ntchito:
BOD: Imagwiritsidwa ntchito pounika momwe chilengedwe chimakhudzira madzi akutayira pamadzi achilengedwe, makamaka pakutha kwa okosijeni komanso kuthekera kwake kuchititsa kufa kwa zamoyo zam'madzi.
COD: Imagwiritsidwa ntchito kwambiri powunika mwachangu kuchuluka kwa madzi otayira m'mafakitale, makamaka ngati madzi otayira ali ndi zinthu zapoizoni kapena zosawola. Chifukwa cha kuyeza kwake mwachangu, COD nthawi zambiri imagwiritsidwa ntchito poyang'anira nthawi yeniyeni ndikuwongolera njira pamakina oyeretsera madzi oyipa.

Chidule cha Kusiyana Kwapakati

Khalidwe	COD (Chemical Oxygen Demand)	BOD (Kufunika kwa Oxygen kwa Biochemical)
Mfundo yofunika	Chemical oxidation	Biological oxidation (ntchito ya tizilombo)
Oxidant	Mankhwala amphamvu okosijeni (monga potassium dichromate)	Aerobic microorganisms
Muyeso woyezera	Mulinso zinthu zonse zomwe zimatha kukhala ndi okosijeni (kuphatikiza zosawonongeka)	Ndi biodegradable organic kanthu
Kutalika kwa mayeso	Yaifupi (maola 2-3)	Kutalika (masiku 5 kapena kuposerapo)
Ubale wa manambala	COD ≥ BOD	BOD ≤ COD

Pomaliza:

COD ndi BOD ndizizindikiro zowonjezera pakuwunika kuipitsidwa kwachilengedwe m'madzi m'malo mofananirako. COD ikhoza kuonedwa ngati "kufunidwa kwa okosijeni wambiri" pazachilengedwe zonse zomwe zilipo, pomwe BOD imawonetsa "kuthekera kwenikweni kwa okosijeni" m'chilengedwe.

Kumvetsetsa kusiyana ndi maubwenzi pakati pa COD ndi BOD n'kofunika kwambiri popanga njira zoyeretsera madzi onyansa, kuyesa madzi abwino, ndikukhazikitsa miyezo yoyenera yotayira.

TP TN CODMn Nitrate nitrogen COD BOD Ammonia nitrogen analyzer

Shanghai Boqu Instrument Co., Ltd. imagwira ntchito popereka zowunikira zamtundu wamadzi pa intaneti za COD ndi BOD. Zida zathu zowunikira mwanzeru zimathandizira kuyang'anira nthawi yeniyeni komanso yolondola, kutumiza deta yodziwikiratu, ndi kasamalidwe ka mitambo, potero zimathandizira kukhazikitsidwa bwino kwa njira yowunikira madzi akutali komanso anzeru.

Lembani uthenga wanu apa ndikutumiza kwa ife

Nthawi yotumiza: Sep-10-2025