Impembelelo yokufunwa kakhulu kwe-oxygen (COD) emanzini kwimpilo yabantu nakwindalo esingqongileyo ibalulekile. I-COD isebenza njengophawu oluphambili lokulinganisa uxinano lwezinto ezingcolisayo eziphilayo kwiinkqubo zasemanzini. Amanqanaba aphezulu e-COD abonisa ungcoliseko olukhulu lwezinto eziphilayo, olubeka umngcipheko omkhulu kwiinkqubo zendalo nakwimpilo yoluntu.

Iikhompawundi ze-organic ezinetyhefu ezingena emanzini zingonakalisa izinto eziphilayo zasemanzini, kuquka iintlanzi, kwaye zinokuqokelelana kwikhonkco lokutya, ekugqibeleni zingene emzimbeni womntu kwaye zikhokelele kwityhefu engapheliyo. Umzekelo, ukuvezwa ixesha elide kwizinto ezifana ne-DDT kuye kwanxulunyaniswa nemiphumo emibi kwinkqubo yemithambo-luvo, umonakalo wesibindi, ukungasebenzi kakuhle komzimba, kunye nokuphazamiseka okunokwenzeka kwiinkqubo zokuzala nezemfuza, kubandakanya umngcipheko okhulayo wokuphazamiseka kokuzalwa kunye ne-carcinogenesis.

Amanqanaba aphezulu e-COD nawo ayawuphazamisa umgangatho wamanzi kwaye aphazamise ulungelelwaniso lwendalo. Xa ungcoliseko lwezinto eziphilayo lungena emilanjeni nasemachibini ngaphandle konyango olukhawulezileyo, uninzi lufunxwa kwiindawo ezingaphantsi komhlaba. Ekuhambeni kwexesha, ezi zinto ziqokelelweyo zinemiphumo emibi yexesha elide kwizidalwa zasemanzini. Oku kubonakala ngeendlela ezimbini eziphambili: okokuqala, ukufa ngobuninzi kweentlobo zezilwanyana zasemanzini kunokwenzeka, okuphazamisa indalo kwaye okunokubangela ukuwohloka kweendawo zokuhlala zasemanzini; okwesibini, iityhefu ziyaqokelelana ngokuthe ngcembe kwizinto eziphilayo ezifana neentlanzi kunye neentlanzi. Ukutya kwabantu ukutya kwaselwandle okungcolisiweyo kuphumela ekudluliseleni nasekuqokeleleni kwezi zinto ziyingozi emzimbeni, nto leyo ebangela iingozi ezinkulu zempilo ixesha elide, kubandakanya umhlaza, ukukhubazeka kophuhliso, kunye notshintsho lwemfuza.

Ngaphezu koko, amanqanaba aphezulu kakhulu e-COD aphazamisa amandla endalo okuzihlambulula emanzini. Ukuwohloka kwezinto eziphilayo kudla i-oksijini enyibilikisiweyo (DO), kwaye xa ukusetyenziswa kwe-oksijini kudlula amazinga okuvuselela i-oxygen, amanqanaba e-DO anokwehla aye kwi-zero, nto leyo ebangela iimeko ze-anaerobic. Phantsi kweemeko ezinjalo, umsebenzi we-anaerobic microbial uyaqhubeka, uvelisa igesi ye-hydrogen sulfide kwaye ubangele ukuba amanzi abe mnyama kwaye akhuphe ivumba elibi—izalathisi eziqhelekileyo zongcoliseko olukhulu.

Ukusetyenziswa kwee-COD analyzers kudlala indima ebalulekileyo ekujongeni nasekuthinteleni amanqanaba e-COD agqithisileyo. I-Boqu'COD analyzer isetyenziswa kakhulu ekuhloleni amanzi angaphezulu komhlaba, amanzi angaphantsi komhlaba, amanzi amdaka asekhaya, kunye namanzi amdaka emizi-mveliso. Ixhasa uvavanyo olukhawulezileyo kwindawo kunye nohlalutyo oluchanekileyo lomgangatho wamanzi olusekwe kwilebhu, nto leyo eyenza ukuba ibe sisixhobo esisebenzisekayo sokujonga okusingqongileyo kunye nokulawula ungcoliseko.