Impembelelo yemfuno yeekhemikhali egqithisileyo yeoksijini (COD) emanzini kwimpilo yabantu kunye nendalo esingqongileyo ibalulekile. I-COD isebenza njengophawu oluphambili lokulinganisa ukuxinwa kwezinto ezingcolisa indalo kwiinkqubo zasemanzini. Amanqanaba aphezulu e-COD abonisa ungcoliseko olumandla lwendalo, olubeka imingcipheko enkulu kuzo zombini ii-ikhosistim kunye nempilo yoluntu.

Iikhompawundi ezinobuthi ezinobuthi ezingena emanzini zingonakalisa izinto eziphilayo zasemanzini, kuquka neentlanzi, kwaye zinokuqokelelana kwikhonkco lokutya, ekugqibeleni zingene emzimbeni womntu kwaye zikhokelele kwityhefu engapheliyo. Ngokomzekelo, ukuchanabeka ixesha elide kwizinto ezifana ne-DDT kuye kwanxulunyaniswa nemiphumo emibi kwinkqubo yemithambo-luvo, ukonakala kwesibindi, ukungasebenzi kakuhle komzimba, kunye nokuphazamiseka okunokubakho kwiinkqubo zokuzala kunye nemfuzo, kubandakanywa nemingcipheko eyongeziweyo yokuzalwa okungaqhelekanga kunye ne-carcinogenesis.

Amanqanaba aphezulu e-COD nawo abeka emngciphekweni umgangatho wamanzi kwaye aphazamise ulungelelwaniso lwendalo. Xa ungcoliseko lwendalo lungena emilanjeni kunye namachibi ngaphandle konyango lwangexesha, uninzi lufakwa kwintlenga esezantsi. Ngokuhamba kwexesha, ezi zinto ziqokelelweyo zineziphumo eziyityhefu zexesha elide kubomi basemanzini. Oku kubonakala ngeendlela ezimbini eziphambili: eyokuqala, ukufa kweentlobo zezityalo zasemanzini ngobuninzi kunokuthi kwenzeke, kuphazamisa inkqubo yokuphilisana kwezidalwa kunye nokunokukhokelela ekuwohlokeni kweendawo zokuhlala zasemanzini zizonke; okwesibini, ityhefu ngokuthe ngcembe iqokelelana kwizinto eziphilayo ezinjengentlanzi noonokrwece. Ukusetyenziswa koluntu kokutya kwaselwandle okungcolisekileyo kubangela ukudluliselwa kunye nokuqokelelana kwezi zinto ziyingozi ngaphakathi emzimbeni, ezibeka imingcipheko yempilo yexesha elide, kubandakanya umhlaza, ukungahambi kakuhle kophuhliso, kunye nokuguqulwa kofuzo.

Ngaphezu koko, amanqanaba aphezulu e-COD awonakalisa amandla endalo okuzihlambulula emizimbeni yamanzi. Ukuthotywa kwezinto eziphilayo kudla i-oksijeni enyibilikisiweyo (DO), kwaye xa ukusetyenziswa kwe-oksijini kudlula amazinga e-reoxygenation, amanqanaba e-DO angawela kwi-zero, okubangelwa iimeko ze-anaerobic. Ngaphantsi kweemeko ezinjalo, umsebenzi we-anaerobic microbial uyaqhubeka, uvelisa igesi ye-hydrogen sulfide kwaye ibangela ukuba amanzi abe mnyama kwaye akhuphe ivumba elibi-izibonakaliso eziqhelekileyo zokungcola okukhulu.

Ukusetyenziswa kwe-COD analyzers kudlala indima ebalulekileyo ekubekeni iliso kunye nokuthintela amanqanaba aphezulu e-COD. Isihlalutyi se-Boqu'COD sisetyenziswa ngokubanzi kuvavanyo lwamanzi angaphezulu, amanzi aphantsi komhlaba, ugutyulo lwasekhaya, kunye namanzi amdaka akwimizi-mveliso. Ixhasa uvavanyo olukhawulezileyo olungxamisekileyo kwindawo kunye nohlalutyo oluchanekileyo lomgangatho wamanzi olusekwe elabhoratri, nto leyo eyenza ukuba ibe sisixhobo esiguquguqukayo sokuhlolwa kokusingqongileyo kunye nolawulo longcoliseko.