Kukanganiswa kwekudiwa kweoxygen yakawanda mumvura (COD) pahutano hwevanhu nenzvimbo yezvakatipoteredza kwakakosha. COD inoshanda sechiratidzo chikuru chekuyera huwandu hwezvinosvibisa zvipenyu muzvisikwa zvemumvura. Kuwanda kweCOD kunoratidza kusvibiswa kwakanyanya kwezvinhu zvipenyu, izvo zvinoisa njodzi huru kunharaunda yezvakatipoteredza uye kuhutano hweveruzhinji.

Zvinhu zvine chepfu zvinopinda mumvura zvinogona kukuvadza zvisikwa zvemumvura, kusanganisira hove, uye zvinogona kuungana kuburikidza nechikafu, zvozopedzisira zvapinda mumuviri wemunhu zvichikonzera chepfu isingaperi. Semuenzaniso, kugara uchiona zvinhu zvakaita seDDT kwenguva refu kwave kuchibatanidzwa nemhedzisiro yakaipa patsinga, kukuvara kwechiropa, kusashanda zvakanaka kwemuviri, uye kukanganisa kunogona kuitika kuhurongwa hwekubereka uye majini, kusanganisira kuwedzera kwenjodzi dzezvirwere zvekuzvarwa nazvo uye kenza.

Mafuta eCOD akawandisa anokanganisawo kunaka kwemvura uye anokanganisa kuenzana kwezvakatipoteredza. Kana tsvina yeorganic ikapinda munzizi nemadziva pasina kurapwa nenguva, yakawanda inonyudzwa mumadhaka ari pasi. Nekufamba kwenguva, zvinhu izvi zvakaunganidzwa zvine chepfu kwenguva refu pahupenyu hwemumvura. Izvi zvinoonekwa nenzira mbiri huru: yekutanga, kufa kwemarudzi akawanda emumvura kunogona kuitika, zvichikanganisa kugadzikana kwezvakatipoteredza uye zvingangotungamira mukuputsika kwenzvimbo dzese dzemumvura; yechipiri, chepfu dzinoungana zvishoma nezvishoma muzvisikwa zvakaita sehove nehove. Kudya kwehove dzakasvibiswa nevanhu kunoguma nekuwanda kwezvinhu izvi zvinokuvadza mumuviri, zvichikonzera njodzi huru dzehutano kwenguva refu, kusanganisira kenza, kukuvara kwekukura, uye kushanduka kwemajini.

Uyezve, huwandu hwakawanda hweCOD hunokanganisa kugona kwekuzvichenesa kwezvisikwa kwemvura. Kuora kwezvinhu zvipenyu kunodya okisijeni yakanyungudutswa (DO), uye kana kushandiswa kweokisijeni kwakapfuura mwero we reoxygenation, huwandu hweDO hunogona kudzikira kusvika pazero, zvichikonzera mamiriro ekusafema. Mumamiriro ezvinhu akadaro, basa remabhakitiriya asina kufema rinoramba riripo, richigadzira gasi rehydrogen sulfide uye zvichiita kuti mvura isvibe uye ibudise hwema hwakaipa—zviratidzo zvinowanzoonekwa zvekusvibiswa kwakanyanya.

Kushandiswa kweCOD analyzers kunoita basa rakakosha mukutarisa nekudzivirira huwandu hwakawanda hweCOD. Boqu'COD analyzer inoshandiswa zvakanyanya mukuongorora mvura yepamusoro, pasi pevhu, tsvina yemumba, uye mvura yakasviba yemumaindasitiri. Inotsigira bvunzo dzekukurumidza panzvimbo uye kuongorora kwakanyatsojeka kwemhando yemvura yakavakirwa murabhoritari, zvichiita kuti ive chishandiso chinoshanda zvakanyanya chekutarisa nharaunda uye kudzora kusvibiswa.