COD chiratidzo chinoreva kuyerwa kwezviri mukati meorganic substances mumvura. Iyo COD yakakwirira, ndiyo yakanyanya kushatisa kusvibiswa kwemuviri wemvura nezvinhu zvine organic. Toxic organic matter inopinda mumvura yemvura haingokuvadzi zvipenyu zviri mumvura sehove, asi zvakare inogona kupfumiswa mucheni yechikafu yobva yapinda mumuviri wemunhu, zvichikonzera chepfu chisingaperi. Semuenzaniso, chepfu isingaperi yeDDT inogona kukanganisa hurongwa hwetsinga, kuparadza kushanda kwechiropa, kukonzera kusagadzikana kwemuviri, uye inogona kutokanganisa kubereka uye genetics, kuburitsa zvipenga uye kukonzera kenza.
COD ine simba guru pamhando yemvura uye nharaunda yezvakatipoteredza. Kamwe organic zvinosvibisa zvine yakakwira COD yemukati ichipinda munzizi nemadziva, kana isingakwanise kurapwa nenguva, zvinhu zvakawanda zveorganic zvinogona kutorwa nevhu pasi pemvura uye kuungana nekufamba kwemakore. Ichakonzera kukuvadza kune marudzi ese ezvipenyu mumvura, uye muchetura unogara kwemakore akati wandei. Iyi chepfu mhedzisiro ine maitiro maviri:
Kune rimwe divi, zvinokonzeresa nhamba huru yekufa kwezvipenyu zvemumvura, kuparadza kuenzana kwezvakatipoteredza mumvura yemvura, uye kunyange kuparadza zvakananga rwizi rwese ecosystem.
Kune rumwe rutivi, chepfu inoungana zvishoma nezvishoma mumitumbi yezvipenyu zvemumvura zvakadai sehove uye shrimp. Kana vanhu vangodya izvi zvipenyu zvemumvura zvine chepfu, chepfu ichapinda mumuviri wemunhu uye ichiungana nekufamba kwemakore, ichikonzera cancer, kuremara, gene mutation, nezvimwe. Zvisingatarisirwi zvakakomba mhedzisiro.
Kana iyo COD yakakwira, inokonzeresa kuparara kwemhando yemvura yemuviri wemvura chaiwo. Chikonzero ndechekuti kuzvinatsa kwemuviri wemvura kunoda kushatisa izvi organic zvinhu. Kushatisa kweCOD kunofanira kupedza okisijeni, uye simba reoxygenation mumuviri wemvura harigone kuita zvinodiwa. Ichadonha zvakananga ku0 uye ive anaerobic mamiriro. Munzvimbo yeanaerobic, icharamba ichiora (anaerobic kurapwa kwehutachiona), uye muviri wemvura unoshanduka wakasviba uye unonhuwa (anaerobic microorganisms inotaridzika yakasviba zvakanyanya uye inoburitsa hydrogen sulfide gasi. ).
Iko kushandiswa kweinotakurika COD detectors kunogona kudzivirira zvinobudirira zvakanyanya COD zvemukati mumhando yemvura.
Iyo inotakurika COD analyzer inoshandiswa zvakanyanya mukutemerwa kwemvura yepasi, pasi pevhu, tsvina yemumba uye tsvina yemaindasitiri. Haisi yakakodzera chete kumunda uye pa-saiti yekukurumidza yemhando yemvura yekuyedzwa, asiwo yekuongororwa kwemhando yemvura murabhoritari.
Mitemo inowirirana
HJ/T 399-2007 Hunhu hweMvura – Kutemerwa kweKemikari Oxygen Demand – Rapid Digestion Spectrophotometry
JJG975-2002 Chemical Oxygen Demand (COD) Meter
Nguva yekutumira: Kubvumbi-13-2023
