Umthelela wesidingo se-oxygen yamakhemikhali ngokweqile (COD) emanzini empilweni yomuntu kanye nendawo ezungezile ubalulekile. I-COD isebenza njengenkomba eyinhloko yokulinganisa ukugcwala kokungcola kwemvelo ezinhlelweni zasemanzini. Amazinga e-COD aphakeme akhombisa ukungcoliswa okukhulu kwezinto eziphilayo, okubeka engcupheni enkulu kukho kokubili i-ecosystem kanye nempilo yomphakathi.

Izinhlanganisela zezinto eziphilayo ezinobuthi ezingena emanzini zingalimaza izinto eziphilayo zasemanzini, kuhlanganise nezinhlanzi, futhi zinganqwabelana ngochungechunge lokudla, ekugcineni zingene emzimbeni womuntu futhi ziholele ebusheni obungapheli. Isibonelo, ukuchayeka isikhathi eside ezintweni ezifana ne-DDT kuhlotshaniswe nemiphumela emibi ohlelweni lwezinzwa, ukulimala kwesibindi, ukungasebenzi kahle komzimba, kanye nokuphazamiseka okungase kube khona ezinhlelweni zokuzala nezofuzo, okuhlanganisa nezingozi ezengeziwe zokungajwayelekile kokuzalwa kanye ne-carcinogenesis.

Amazinga aphezulu e-COD nawo abeka engcupheni ikhwalithi yamanzi futhi aphazamise ibhalansi yemvelo. Lapho ukungcola kwemvelo kungena emifuleni nasemachibini ngaphandle kokwelashwa okufika ngesikhathi, okuningi kukhangiswa ezinhlakeni ezingaphansi. Ngokuhamba kwesikhathi, lezi zinto ezinqwabelene ziba nemiphumela enobuthi yesikhathi eside empilweni yasemanzini. Lokhu kubonakala ngezindlela ezimbili eziyinhloko: eyokuqala, ukufa kwabantu abaningi kwezilwane zasemanzini kungase kwenzeke, kuthuntubeze i-ecosystem futhi okungase kuholele ekuweni kwazo zonke izindawo ezihlala emanzini; okwesibili, ubuthi bunqwabelana kancane kancane ezintweni eziphila njengezinhlanzi nezimbaza. Ukusetshenziswa komuntu ukudla kwasolwandle okungcolile kubangela ukudluliswa nokunqwabelana kwalezi zinto eziyingozi emzimbeni, okudala ubungozi bezempilo besikhathi eside, okuhlanganisa umdlavuza, ukukhubazeka kokukhula, nokuguqulwa kofuzo.

Ngaphezu kwalokho, amazinga e-COD aphezulu kakhulu akhubaza amandla emvelo okuzihlanza emizimbeni yamanzi. Ukuwohloka kwezinto eziphilayo kudla umoya-mpilo oncibilikisiwe (DO), futhi lapho ukusetshenziswa komoyampilo kudlula amazinga okukhishwa kabusha kwe-oksijini, amazinga e-DO angehlela kuqanda, okuholela ezimweni ze-anaerobic. Ngaphansi kwezimo ezinjalo, umsebenzi we-anaerobic microbial uyaphikelela, ukhiqiza igesi ye-hydrogen sulfide futhi ubangele amanzi abe mnyama futhi akhiphe iphunga elibi—izinkomba ezivamile zokungcola okukhulu.

Ukusetshenziswa kwezihlaziyi ze-COD kudlala indima ebalulekile ekuqapheni nasekuvimbeleni amazinga e-COD eqile. I-Boqu'COD analyzer isetshenziswa kabanzi ekuhloleni amanzi angaphezulu, amanzi angaphansi komhlaba, indle yasekhaya, namanzi angcolile ezimbonini. Isekela kokubili ukuhlolwa kwezimo eziphuthumayo esizeni kanye nokuhlaziywa kwekhwalithi yamanzi okusekwe elabhorathri okunembile, okuyenza ibe ithuluzi eliguquguqukayo lokuqapha imvelo nokulawula ukungcola.