I-Biochemical Oxygen Demand VS Chemical Oxygen Demand

Iyini i-Biochemical Oxygen Demand (BOD)?

I-Biochemical Oxygen Demand (BOD) Eyaziwa nangokuthi i-biochemical oxygen demand. Kuyinkomba ebanzi ekhombisa okuqukethwe kwezinto ezidinga umoya-mpilo njengezinhlanganisela eziphilayo emanzini. Uma i-organic matter equkethwe emanzini ithintana nomoya, yonakala ama-microorganisms e-aerobic, futhi inani lomoya-mpilo elidingekayo ukuze i-inorganic or gasified ibizwa ngokuthi i-biochemical oxygen demand, evezwa ngo-ppm noma mg/L. Lapho inani liphakeme, kuyanda ukungcola okuphilayo emanzini kanye nokungcola okunamandla kakhulu. Eqinisweni, isikhathi sokubola ngokuphelele kwento ephilayo siyahlukahluka ngohlobo kanye nobuningi bayo, uhlobo nenani lama-microorganisms, kanye nesimo samanzi. Ngokuvamile kuthatha amashumi noma amakhulu ezinsuku ukuze i-oxidize ngokuphelele futhi ibole. Ngaphezu kwalokho, Ngezinye izikhathi ngenxa yethonya lezinsimbi ezisindayo nezinto ezinobuthi emanzini, imisebenzi yama-microorganisms iyavinjelwa futhi ibulawe. Ngakho-ke, kunzima ukukala i-BOD ngokunembe kakhulu. Ukuze kuncishiswe isikhathi, isidingo komoyampilo sezinsuku ezinhlanu (BOD5) sivame ukusetshenziswa njengezinga eliyisisekelo lokulinganisa lokungcoliswa kwemvelo emanzini. I-BOD5 icishe ilingane no-70% wokusetshenziswa komoyampilo ukubola okuphelele kwe-oxidative. Ngokuvamile, imifula ene-BOD5 ngaphansi kwe-4ppm ingashiwo ukuthi ayinakho ukungcola.

Ungasihlola kanjani isidingo se-Biochemical oxygen?

Ithuluzi lokubona i-BOD elisebenziseka kalula libaluleke kakhulu ekutholeni izinga lamanzi. Insimbi ye-BOD5 ye-Lianhua isebenzisa indlela ye-mercury-free differential pressure (manometric), engahlola amanzi aqukethe amagciwane ngaphandle kokwengeza ama-reagents amakhemikhali, futhi imiphumela ingaphrintwa ngokuzenzakalelayo. Ubuchwepheshe obuphambili obunelungelo lobunikazi.

Iyini i-Chemical Oxygen Demand (COD)?

I-Chemical oxygen demand (COD) inani lomoya-mpilo odingekayo ukuze kukhishwe ukungcola okuphilayo nezinye izinto ezinciphisa amanzi ngaphansi kwezimo ezithile ezine-oxidizing agent (njenge-potassium dichromate noma i-potassium permanganate), evezwa ngamamiligremu omoya-mpilo osetshenziswa ilitha ngalinye lesampula yamanzi. kusho inombolo. I-COD iyinkomba ebalulekile evame ukusetshenziselwa ukuhlola ikhwalithi yamanzi. Isidingo somoya-mpilo wamakhemikhali sinezici zendlela yokunquma elula nesheshayo. I-Potassium chromate, i-ejenti eyenza i-oxidizing, ingakwazi ukukhipha ngokuphelele izinto eziphilayo emanzini, futhi ingakwazi futhi i-oxidize ezinye izinto ezinciphisayo. I-oxidant potassium permanganate ingakwazi ukukhipha kuphela u-60% wezinto eziphilayo. Ayikho kulezi zindlela ezimbili engabonisa isimo sangempela sokucekelwa phansi kwezinto ezingcolisa imvelo emanzini, ngoba ayikho kuzo eveza inani lezinto eziphilayo ezingase zifakwe oksijini. Ngakho-ke, isidingo se-oksijini ye-biochemical sivame ukusetshenziswa ocwaningweni lwekhwalithi yamanzi engcoliswe izinto eziphilayo.

Njengamanje, ukutholwa kwe-COD kuvame kakhulu ekuhlanzeni amanzi, futhi kudingwa amafekthri, izimboni zendle, omasipala, imifula nezinye izimboni. Ubuchwepheshe bokuthola i-COD be-Lianhua bungathola ngokushesha imiphumela enembile phakathi nemizuzu engu-20 futhi busetshenziswa kabanzi.