I-COD luphawu olubhekiselele kumlinganiselo womxholo wezinto eziphilayo emanzini.Okukhona i-COD iphezulu, kokukhona ungcoliseko lomzimba wamanzi lubi kakhulu zizinto eziphilayo.Izinto eziphilayo ezinobuthi ezingena emzimbeni wamanzi azenzakalisi kuphela izinto eziphilayo kumzimba wamanzi njengentlanzi, kodwa zinokutyetyiswa kwikhonkco lokutya kwaye zingene emzimbeni womntu, zibangele ityhefu engapheliyo.Ngokomzekelo, ityhefu engapheliyo ye-DDT inokuchaphazela inkqubo yemithambo-luvo, itshabalalise ukusebenza kwesibindi, ibangele ukuphazamiseka komzimba, kwaye isenokuchaphazela nokuzala kunye nemfuza, ivelise izinto ezingaqhelekanga ize ibangele umhlaza.
I-COD inempembelelo enkulu kumgangatho wamanzi kunye nokusingqongileyo kwendalo.Nje ukuba ungcoliseko lwendalo olunomxholo ophakamileyo weCOD lungene emilanjeni nasemachibini, ukuba akanakunyangwa kwangethuba, izinto ezininzi eziphilayo zinokufunxwa ngumhlaba ongaphantsi kwamanzi kwaye ziqokelelane ngokuhamba kweminyaka.Kuya kubangela ingozi kuzo zonke iintlobo zezinto eziphilayo emanzini, kwaye umphumo wetyhefu uya kuhlala iminyaka emininzi.Esi siphumo setyhefu sineziphumo ezimbini:
Kwelinye icala, iya kubangela inani elikhulu lokufa kwezinto eziphilayo zasemanzini, itshabalalise ibhalansi ye-ecological kumzimba wamanzi, kwaye itshabalalise ngokuthe ngqo yonke i-ecosystem yomlambo.
Kwelinye icala, ityhefu iqokelelana kancinane emizimbeni yezinto eziphila emanzini njengentlanzi kunye neshrimps.Xa abantu besitya ezi zinto ziphilayo zasemanzini ezinetyhefu, i-toxins iya kungena emzimbeni womntu kwaye iqokelele ngokuhamba kweminyaka, ibangele umhlaza, ukukhubazeka, ukuguqulwa kofuzo, njl. Iziphumo ezingalindelekanga ezingalindelekanga.
Xa iCOD iphezulu, iya kubangela ukuwohloka komgangatho wamanzi kumzimba wamanzi endalo.Isizathu kukuba ukuhlanjululwa komzimba wamanzi kufuneka kuthotywe ezi zinto eziphilayo.Ukuthotywa kwe-COD kufuneka kudle i-oksijini, kwaye umthamo we-reoxygenation kumzimba wamanzi awukwazi ukuhlangabezana neemfuno.Iya kuhla ngokuthe ngqo kwi-0 kwaye ibe yimeko ye-anaerobic.Kwimeko ye-anaerobic, iya kuqhubeka nokubola (unyango lwe-anaerobic lwe-microorganisms), kwaye umzimba wamanzi uya kuba mnyama kwaye uvumba (i-anaerobic microorganisms ibonakala imnyama kakhulu kwaye ivelise igesi ye-hydrogen sulfide. ).
Ukusetyenziswa kwee-COD detectors eziphathekayo kunokuthintela ngokufanelekileyo umxholo weCOD ngokugqithiseleyo kumgangatho wamanzi.
Isihlalutyi seCOD esiphathwayo sisetyenziswa kakhulu ekumiseleni amanzi aphezu komhlaba, amanzi aphantsi komhlaba, ilindle lasekhaya kunye namanzi amdaka akwimizi-mveliso.Ayilungelanga kuphela ukuvavanya ubulunga bamanzi obungxamisekileyo ebaleni nakwisiza, kodwa nohlalutyo lobulunga bamanzi elabhoratri.
Imigangatho iyahambelana
HJ/T 399-2007 Umgangatho waManzi – Ukumiselwa kweMfuno yeOxygen yeMichiza – iSpectrophotometry yoDigestion oKhawulezayo
I-JJG975-2002 Imfuno ye-Oxygen ye-Chemical (COD) Imitha
Ixesha lokuposa: Apr-13-2023
