Ruzivo nezve COD BOD analyzer

BOD neCOD zvinoyerwa sei?

Kune nzira dzakasiyana siyana dzinogona kushandiswa kuyera BOD (Biological Oxygen Demand) uye COD (Chemical Oxygen Demand) mumvura. Heino pfupiso yenzira mbiri huru:

Nzira yekudiridza: Munzira yekudiridza, huwandu hwemvura hunozivikanwa hunodiridza nemvura yakadiridza, ine huwandu hushoma hwezvinhu zvipenyu. Sampuro yakadiridza inozoiswa kwenguva yakatarwa (kazhinji mazuva mashanu) patembiricha inodzorwa (kazhinji 20°C). Kuwanda kweokisijeni musampuli kunoyerwa usati waiswa uye mushure mekuiswa. Musiyano wekuwanda kweokisijeni usati waiswa uye mushure mekuiswa unoshandiswa kuverenga BOD yesampuli.

Kuti muyere COD, maitiro akafanana anoteverwa, asi sampuro inorapwa ne chemical oxidizing agent (yakadai se potassium dichromate) pachinzvimbo chekuiswa mu incubation. Kuwanda kwe oxygen inodyiwa ne chemical reaction kunoshandiswa kuverenga COD ye sampuro.

Nzira yeRespirometer: Munzira yeRespirometer, mudziyo wakavharwa (unonzi respirometer) unoshandiswa kuyera kushandiswa kweoxygen kwetupukanana pazvinoputsa zvinhu zvipenyu mumvura. Kuwanda kweoxygen murespirometer kunoyerwa kwenguva yakatarwa (kazhinji mazuva mashanu) patembiricha inodzorwa (kazhinji 20°C). BOD yemuenzaniso inoverengerwa zvichienderana nekuderera kwehuwandu hweoxygen nekufamba kwenguva.

Nzira yekudilution uye nzira ye respirometer inzira dzakajairwa dzinoshandiswa pasi rese kuyera BOD neCOD mumvura.

Chii chinonzi muganho weBOD neCOD?

BOD (Biological Oxygen Demand) uye COD (Chemical Oxygen Demand) zviyero zvehuwandu hweokisijeni hunodiwa kuti zvinhu zvipenyu zviparare mumvura. Mazinga eBOD neCOD anogona kushandiswa kuongorora mhando yemvura uye kukanganisa kunogona kuitika kana mvura yakasviba yabuda mumvura.

Miganhu yeBOD neCOD ndiyo mitemo inoshandiswa kudzora mwero weBOD neCOD mumvura. Miganhu iyi inowanzo gadziriswa nemasangano anotonga uye inobva pahuwandu hunogamuchirwa hwezvinhu zvipenyu mumvura husingazokanganisi nharaunda. Miganhu yeBOD neCOD inowanzo ratidzwa mumamirigiramu eokisijeni pa litre imwe neimwe yemvura (mg/L).

Miganhu yeBOD inoshandiswa kudzora huwandu hwezvinhu zvipenyu mumvura yakasviba inoburitswa mumvura, zvakaita senzizi nemadziva. Huwandu hwakawanda hweBOD mumvura hunogona kuderedza huwandu hweokisijeni mumvura uye kukuvadza zvipenyu zvemumvura. Nekuda kweizvozvo, nzvimbo dzekuchenesa mvura yakasviba dzinofanirwa kusangana nemiganhu yakatarwa yeBOD padzinoburitsa tsvina yadzo.

Miganhu yeCOD inoshandiswa kudzora huwandu hwezvinhu zvipenyu nezvimwe zvinosvibisa mumvura yakasviba yemumaindasitiri. Huwandu hwakawanda hweCOD mumvura hunogona kuratidza kuvapo kwezvinhu zvine chepfu kana zvinokuvadza, uye hunogonawo kuderedza huwandu hweokisijeni mumvura uye kukuvadza zvipenyu zvemumvura. Zvivako zvemaindasitiri zvinowanzo fanirwa kusangana nemiganhu chaiyo yeCOD pazvinoburitsa mvura yakasviba.

Kazhinji, miganhu yeBOD neCOD inzira dzakakosha dzekuchengetedza nharaunda uye kuona kuti mvura iri mumvura yakanaka.