Kufunika Kwa Oxygen Wachilengedwe VS Chemical Oxygen Demand

Kodi Biochemical Oxygen Demand (BOD) ndi chiyani?

Kufunika kwa Oxygen wa Biochemical (BOD) Kumatchedwanso kuti biochemical oxygen demand. Ndilolozera wokwanira wosonyeza zomwe zili muzinthu zomwe zimafunikira mpweya monga ma organic compounds m'madzi. Pamene zinthu zamoyo zomwe zili m'madzi zikhudzana ndi mpweya, zimawola ndi tizilombo toyambitsa matenda, ndipo kuchuluka kwa mpweya wofunikira kuti ukhale wopangidwa ndi mpweya kapena mpweya umatchedwa biochemical oxygen demand, yomwe imafotokozedwa mu ppm kapena mg/L. Mtengowo ukakhala wapamwamba kwambiri, m’pamenenso m’pamenenso pali zinthu zambiri zowononga zinthu zachilengedwe m’madzi ndipo m’pamenenso zimawononga kwambiri. M'malo mwake, nthawi yowola kotheratu zinthu zamoyo zimasiyanasiyana ndi mtundu wake ndi kuchuluka kwake, mtundu ndi kuchuluka kwa tizilombo tating'onoting'ono, komanso mawonekedwe amadzi. Nthawi zambiri zimatenga makumi kapena mazana amasiku kuti oxidize kwathunthu ndikuwola. Komanso, Nthawi zina chifukwa cha mphamvu ya zitsulo zolemera ndi zinthu zapoizoni m'madzi, ntchito za tizilombo toyambitsa matenda zimalephereka ndipo ngakhale kuphedwa. Choncho, n'zovuta kuyeza BOD molondola kwambiri. Pofuna kufupikitsa nthawi, kufunikira kwa okosijeni wamasiku asanu (BOD5) nthawi zambiri kumagwiritsidwa ntchito ngati mulingo woyambira wazinthu zowononga zachilengedwe m'madzi. BOD5 ndi pafupifupi yofanana ndi 70% ya kumwa kwa okosijeni pakuwonongeka kwathunthu kwa okosijeni. Nthawi zambiri, mitsinje yokhala ndi BOD5 pansi pa 4ppm imatha kunenedwa kuti ilibe kuipitsa.

Momwe mungayesere kufunikira kwa okosijeni wa Biochemical?

Chida chodziwika bwino cha BOD chosavuta kugwiritsa ntchito ndichofunikira kwambiri pakuzindikira mtundu wamadzi. Chida cha BOD5 cha Lianhua chitengera njira ya mercury-free differential pressure (manometric), yomwe imatha kuyesa madzi okhala ndi mabakiteriya osawonjezera ma reagents amankhwala, ndipo zotsatira zake zitha kusindikizidwa zokha. Ukadaulo wotsogola wapatent.

Kodi Chemical Oxygen Demand (COD) ndi chiyani?

Kufunika kwa okosijeni wa Chemical (COD) ndi kuchuluka kwa okosijeni wofunikira kuti oxidize zoipitsa zachilengedwe ndi zinthu zina zochepetsera m'madzi pansi pamikhalidwe ina ndi oxidizing agent (monga potaziyamu dichromate kapena potaziyamu permanganate), wowonetsedwa mu ma milligrams a oxygen omwe amadyedwa pa lita imodzi yamadzi. nambala idatero. COD ndi chizindikiro chofunikira chomwe chimagwiritsidwa ntchito powunika momwe madzi alili. Kufunika kwa okosijeni wa Chemical kumakhala ndi mawonekedwe a njira yosavuta komanso yodziwira mwachangu. Potaziyamu chromate, wothandizila oxidizing, amatha oxidize organic zinthu m'madzi, komanso oxidize zinthu zina kuchepetsa. Oxidant potaziyamu permanganate imatha kutulutsa pafupifupi 60% yazinthu zachilengedwe. Palibe mwa njira ziwirizi zomwe zingawonetsere momwe zinthu zilili pakuwonongeka kwa zowononga zachilengedwe m'madzi, chifukwa palibe mwa iwo amene amawonetsa kuchuluka kwa zinthu zomwe tizilombo toyambitsa matenda titha kutulutsa. Chifukwa chake, kufunikira kwa okosijeni wachilengedwe kumagwiritsidwa ntchito nthawi zambiri pofufuza zamadzi oipitsidwa ndi zinthu zachilengedwe.

Pakalipano, kuzindikira kwa COD kumakhala kofala kwambiri pazitsulo zamadzi, ndipo kumafunidwa ndi mafakitale, zonyansa, ma municipalities, mitsinje ndi mafakitale ena. Tekinoloje yozindikira COD ya Lianhua imatha kupeza zotsatira zolondola mkati mwa mphindi 20 ndipo imagwiritsidwa ntchito kwambiri.