Ọrụ Oxygenation Microporous Aeration

N'ime usoro ọgwụgwọ mmiri na-ekpofu mmiri, usoro ikuku na-akpata 45% ruo 75% nke oriri ike nke ụlọ ọrụ mmiri na-ekpofu mmiri dum, iji mee ka ikuku oxygen na-ebufe ọrụ nke ikuku ikuku, a na-ejikarị ụlọ ọrụ na-edozi mmiri na-ekpo ọkụ ugbu a na microporous. Sistemu ikuku. Ka o sina dị, ọnụọgụ ikuku oxygen nke usoro ikuku ya dịkwa n'ogo 20% ruo 30%. Na mgbakwunye, enweela ọtụtụ mpaghara na China iji teknụzụ ikuku microporous maka ọgwụgwọ osimiri ndị emetọtọ, mana ọ nweghị nyocha maka otu esi eji ezi uche họrọ ikuku ikuku microporous maka ọnọdụ mmiri dị iche iche. Ya mere, njikarịcha nke microporous aerator oxygenation paramita arụmọrụ maka mmepụta na ngwa n'ezie dị oke mkpa.

Enwere ọtụtụ ihe na-emetụta arụmọrụ microporous aeration na oxygenation, nke kachasị mkpa bụ ụda ikuku, nha pore na ntinye nke omimi mmiri.

Ka ọ dị ugbu a, enwere ntakịrị ọmụmụ banyere mmekọrịta dị n'etiti arụmọrụ oxygenation nke microporous aerator na pore size na ntinye omimi n'ụlọ na mba ọzọ. Nchọpụta ahụ lekwasịrị anya karịa n'ịkwalite mkpokọta ikuku oxygen na ikike ikuku oxygen, ma na-eleghara nsogbu oriri ume anya na usoro ikuku. Anyị na-ewere usoro ike ike dị ka isi nyocha index, jikọtara ya na ikike oxygenation na usoro nke iji oxygen na-eme ihe, na-ebuli elu nke ikuku ikuku, dayameta oghere na nrụnye omimi mgbe arụmọrụ aeration kachasị elu, iji nye ntụaka maka ngwa ahụ. nke teknụzụ ikuku microporous na ọrụ a n'ezie.

1.Materials na ụzọ

1.1 Nhazi nhazi

Ejiri Plexiglas mee nhazi ule a, isi ahụ bụ D {0}}.4 m × 2m cylindrical aeration tank nwere nyocha oxygen gbazere nke dị 0.5 m n'okpuru mmiri (egosiri na foto 1). ).

Ọgụgụ 1 Nhazi Nnwale ikuku na ikuku oxygen

1.2 Ihe nyocha

Microporous aerator, mere nke rọba akpụkpọ ụkwụ, dayameta 215 mm, pore nha 50, 100, 200, 500, 1 000 μm. Sension378 benchtop agbazere oxygen tester, HACH, USA. Gas rotor eruba mita, nso 0 ~ 3 m3 / h, izi ezi ± 0.2%. HC-S ikuku. Onye na-eme ihe: CoCl2-6H2O, nleba anya dị ọcha; Deoxidant: Na2SO3, nyocha dị ọcha.

1.3 Usoro ule

Emere ule a site na iji usoro static na-abụghị nke kwụ ọtọ, ya bụ, Na2SO3 na CoCl2-6H2O bụ nke mbụ a na-enye maka deoxygenation n'oge ule ahụ, na ikuku malitere mgbe ikuku oxygen gbazere n'ime mmiri belatara ruo {{5} } A na-edekọ mgbanwe na mgbaze ikuku oxygen na mmiri ka oge na-aga, ma gbakọọ uru KLa. A nwalere arụmọrụ ikuku oxygen n'okpuru mpịakọta ikuku dị iche iche (0.5, 1, 1.5, 2, 2.5, 3 m3/h), nha pore dị iche iche (50, 100, 200, 500, 1, 000 μm), na omimi mmiri dị iche iche (0.8, 1.1, 1.3, 1.5, 1.8, 2.0 m), na ntụaka ka e mekwara na CJ/T 3015.{35}} "Aerator clear water oxygenation performance determination" na United States doro anya ụkpụrụ ule oxygenation mmiri.

2. Nsonaazụ na mkparịta ụka

2.1 Ụkpụrụ nke ule

Ụkpụrụ bụ isi nke ule ahụ dabere na tiori akpụkpọ anụ okpukpu abụọ nke Whitman tụpụtara na 1923. Enwere ike igosipụta usoro nnyefe ikuku oxygen na nhazi (1).

Ebe: dc/dt - ọnụego mbufe oke, ya bụ, ọnụọgụ oxygen na-ebufe kwa otu olu mmiri kwa oge, mg/(Ls).

KLa - ngụkọta nnyefe oxygen nke ikuku na ọnọdụ ule, min{1}} ;

C * - ikuku oxygen gbazere na mmiri, mg/L.

Ct - gbazere oxygen n'ime mmiri n'oge aeration t, mg/L.

Ọ bụrụ na ule ule adịghị na 20 degrees, equation (2) nwere ike iji dozie maka KLa:

A na-egosipụta ike ikuku oxygenation (OC, kg / h) site na nhazi (3).

Ebe: V - ụda ọdọ mmiri aeration, m3.

Egosiputa ojiji ikuku oxygen (SOTE,%) site na nhata (4).

Ebe: q - ụda ikuku na ọnọdụ ọkọlọtọ, m3 / h.

A na-egosipụta arụmọrụ ike usoro ihe omume [E, kg/(kW-h)] site na nhazi (5).

Ebe: P - ike aeration akụrụngwa, kW.

Ihe ngosi ndị a na-ejikarị eme ihe maka nyochaa arụmọrụ ikuku oxygenation bụ ngụkọta ikuku oxygen na-ebufe ọnụọgụ KLa, ikike ikuku oxygenation OC, ọnụọgụ oxygen ojiji SOTE na ike arụmọrụ E [7]. Ọmụmụ ihe ndị dị ugbu a lekwasịrị anya karịa na usoro nke mkpokọta ikuku oxygen na-ebufe ọnụ ọgụgụ, ikike ikuku oxygen na iji oxygen na-arụ ọrụ, yana obere na arụmọrụ ike ikike [8, 9]. Ikike ike usoro ihe omume, dị ka naanị ntinye aka arụmọrụ [10], nwere ike igosipụta nsogbu oriri ike na usoro ikuku, nke bụ isi nke nnwale a.

2.2 Mmetụta nke ikuku na arụmọrụ oxygenation

A na-enyocha arụmọrụ oxygenation na ọkwa ikuku dị iche iche site na ikuku na ala 2 m nke ikuku ikuku nwere oghere nke 200 μm, na nsonaazụ ya gosipụtara na Fig. 2.

Fig. 2 Mgbanwe nke K na ikuku oxygen na ọnụ ọgụgụ ikuku

Dị ka a na-ahụ site na Fig. 2, KLa na-abawanye nwayọọ nwayọọ na mmụba nke ikuku ikuku. Nke a bụ n'ihi na ka ụda ikuku na-ebuwanye ibu, ebe ikuku gas na-ebuwanye ibu ma na-arụ ọrụ ikuku oxygen. N'aka nke ọzọ, ụfọdụ ndị nchọpụta chọpụtara na ọnụ ọgụgụ ikuku oxygen na-ebelata site na mmụba nke ikuku ikuku, na ọnọdụ yiri nke a na nnwale a. Nke a bụ n'ihi na n'okpuru ụfọdụ omimi mmiri, oge obibi nke egosipụta na mmiri na-abawanye mgbe ụda ikuku dị ntakịrị, na oge kọntaktị mmiri gas na-agbatị ogologo oge; mgbe ụda ikuku dị ukwuu, nsogbu nke ahụ mmiri na-esiwanye ike, na ọtụtụ n'ime ikuku oxygen adịghị eji ya eme ihe nke ọma, na-emecha hapụ ya n'elu mmiri n'ụdị afụ n'ime ikuku. Ọnụ ọgụgụ ojiji oxygen na-enweta site na nnwale a adịghị elu ma e jiri ya tụnyere akwụkwọ, ma eleghị anya n'ihi na elu nke reactor adịghị elu, na nnukwu ikuku oxygen gbapụrụ na-enweghị ịkpọtụrụ kọlụm mmiri, na-ebelata ọnụ ọgụgụ ojiji oxygen.

E gosipụtara mgbanwe nke ike nrụpụta ike (E) na ikuku ikuku na foto 3.

Fig. 3 Theoretical ike arụmọrụ megide ụda ikuku

Dị ka a na-ahụ na Fig. 3, arụmọrụ ike nke usoro iwu na-ebelata nke nta nke nta site na ikuku na-arịwanye elu. Nke a bụ n'ihi na ọkọlọtọ ikuku oxygen na-ebufe ọnụego na-abawanye na mmụba nke ikuku ikuku n'okpuru ụfọdụ ọnọdụ omimi mmiri, ma mmụba nke ọrụ bara uru nke onye na-agba ọkụ na-eri bụ ihe dị ịrịba ama karịa mmụba nke ọkọlọtọ ikuku oxygen na-ebufe, ya mere, ike nkà mmụta sayensị. na-ebelata site na mmụba nke ikuku ikuku n'ime oke ikuku ikuku enyocha na nnwale ahụ. Na-ejikọta usoro na fig. 2 na 3, enwere ike ịchọpụta na arụ ọrụ oxygenation kacha mma na-enweta na oke ikuku nke 0.5 m3 / h.

2.3 Mmetụta nke oke pore na arụmọrụ oxygenation

Ogo nke pore nwere mmetụta dị ukwuu na nhazi nke afụ, ka ọkpụkpụ pore buru ibu, na-ebuwanye ibu nke afụ ahụ. Afụ na oxygenation arụmọrụ nke mmetụta tumadi pụtara abụọ akụkụ: mbụ, nta onye egosipụta, ibu n'ozuzu afụ kpọmkwem n'elu ebe, ibu gas-mmiri uka nyefe kọntaktị ebe, ndị ọzọ na-eme ka nyefe nke. ikuku oxygen; Nke abuo, ka nnukwu egosipụta, na-arụsi ọrụ ike nke ịkpali mmiri, gas-mmiri mmiri na-agwakọta n'etiti ngwa ngwa, mma mmetụta nke oxygenation. Ọtụtụ mgbe isi ihe mbụ na usoro mbufe oke na-ekere òkè dị ukwuu. Nnwale a ga-abụ ụda ikuku atọrọ ka 0.5 m3/h, iji nyochaa mmetụta nke nha pore na ojiji KLa na ikuku oxygen, lee eserese 4.

Fig. 4 Mgbanwe mgbanwe nke KLa na ikuku oxygen na-eji nha pore

Dị ka a na-ahụ site na Fig. 4, ma KLa na ikuku oxygen na-ebelata site na mmụba nke pore size. N'okpuru ọnọdụ nke otu omimi mmiri na oke ikuku, KLa nke 50 μm aperture aerator dị ihe dị ka ugboro atọ nke nke 1,{3}} μm aperture aerator. Ya mere, mgbe a na-etinye aerator n'ime mmiri dị omimi, obere oghere nke ike ikuku oxygenation na iji oxygen na-abawanye.

A na-egosi mgbanwe dị iche iche nke arụmọrụ ike usoro na nha pore na Fig. 5.

Fig. 5 Theoretical ike arụmọrụ vs. pore size

Dị ka a na-ahụ site na Fig 5, usoro ike nke usoro ihe omume na-egosi usoro nke ịba ụba ma na-ebelata na mmụba nke oghere oghere. Nke a bụ n'ihi na n'otu aka, obere aperture aerator nwere nnukwu KLa na ikike oxygenation, nke na-eme ka ikuku oxygen. N'aka nke ọzọ, nkwụsị nkwụsị n'okpuru ụfọdụ omimi mmiri na-abawanye na mbelata nke oghere oghere. Mgbe mbelata nke pore na nkwụsi ike nke mmetụta nkwalite dị ukwuu karịa ọrụ nke nnyefe ikuku oxygen, a ga-ebelata ike ike echiche na mbelata nke pore size. Ya mere, mgbe oghere oghere dị ntakịrị, arụmọrụ ike nke usoro ihe omume ga-abawanye na mmụba nke oghere oghere, na oghere oghere nke 200 μm iji rute uru kachasị nke 1.91 kg / (kW-h); mgbe dayameta oghere> 200 μm, nkwụsị nkwụsị na usoro ikuku anaghịzi arụ ọrụ kachasị na usoro ikuku, KLa na ikike oxygenation na mmụba nke oghere oghere nke aerator ga-ebelata, ya mere, usoro iwu. arụmọrụ ike na-egosi usoro mgbada dị ịrịba ama.

2.4 Mmetụta nke ntinye mmiri omimi na arụmọrụ oxygenation

Omimi nke mmiri nke etinyere ikuku na-arụ ọrụ nwere mmetụta dị oke mkpa na mmetụta ikuku na ikuku oxygenation. Ebumnuche nke nyocha nnwale ahụ bụ ọwa mmiri na-emighị emi nke na-erughị 2 m. Achọpụtara omimi nke ikuku nke ikuku site na omimi mmiri nke ọdọ mmiri ahụ. Ọmụmụ ihe dị ugbu a na-elekwasị anya na omimi nke submerged nke aerator (ie, a na-etinye aerator na ala ọdọ mmiri, na omimi mmiri na-abawanye site n'ịba ụba nke mmiri), na ule ahụ na-elekwasị anya na ntinye omimi nke mmiri. aerator (ntụgharị, ọnụ ọgụgụ nke mmiri na ọdọ mmiri na-anọgide na-adịgide adịgide, na echichi elu nke aerator na-gbanwee iji chọta kacha mma omimi nke mmiri maka aeration mmetụta), na mgbanwe nke KLa na oxygen itinye n'ọrụ na omimi nke. egosiri mmiri na foto 6.

Fig. 6 Mgbanwe mgbanwe nke K na ikuku oxygen na-eji omimi mmiri

Ọnụọgụ 6 na-egosi na na mmụba nke omimi mmiri, ma KLa na ikuku oxygen na-egosi ọganihu na-arịwanye elu nke ọma, na KLa dị iche site na ihe karịrị ugboro anọ na 0.8 m mmiri omimi na 2 m mmiri omimi. Nke a bụ n'ihi na mmiri dị omimi karị, ogologo oge obibi nke egosipụta na kọlụm mmiri, ogologo oge kọntaktị gas-mmiri mmiri, ka mma na-enyefe ikuku oxygen. Ya mere, ka a na-etinye ihe na-eme ka ikuku dịkwuo omimi, otú ahụ ka ọ na-eme ka ike ikuku oxygen na-arụ ọrụ na ikuku oxygen. Ma ntinye nke omimi mmiri na-abawanye n'otu oge nkwụsị nkwụsị ga-abawanye, iji merie nkwụsị nkwụsị ahụ, ọ dị mkpa ịbawanye ụba nke ikuku, nke ga-eduga n'ịba ụba nke oriri ike na ụgwọ ọrụ. Ya mere, iji nweta omimi nrụnye kachasị mma, ọ dị mkpa iji nyochaa mmekọrịta dị n'etiti arụmọrụ ike usoro na omimi mmiri, lee Tebụl 1.

Tebụl 1 na-egosi na arụmọrụ ike usoro ihe omume dị oke ala na omimi nrụnye nke {{1}.8m, yana naanị 0.5 kg/(kW-h), na-eme ka ikuku mmiri na-emighị emi ezighi ezi. Ntinye nke omimi mmiri nke 1.1 ~ 1.5 m, n'ihi mmụba dị ịrịba ama na ikike ikuku oxygenation, ebe aerator site na nguzogide mmetụta adịghị egosi, ya mere, ike usoro ike na-abawanye ngwa ngwa. Dị ka omimi mmiri na-abawanye n'ihu ruo 1.8 m, mmetụta nke nkwụsị nkwụsị na-arụ ọrụ oxygenation na-aghọwanye ihe dị ịrịba ama, na-eme ka ọganihu nke nkà mmụta sayensị na-eme ka ọ dịkwuo elu, ma ka na-egosi ọganihu na-arịwanye elu, na na ntinye. nke omimi mmiri nke 2 m, ike ike usoro ihe omume ruru 1.97 kg / (kW-h). Ya mere, maka ọwa <2 m, aeration ala na-ahọrọ maka ikuku oxygenation kacha mma.

Mmechi

Iji usoro static na-abụghị nke kwụ ọtọ maka microporous aeration doro anya mmiri oxygenation ule, na nnwale mmiri omimi (< 2 m) and pore size (50 ~ 1 000 μm) conditions, the total oxygen mass transfer coefficient KLa and oxygen utilisation increased with the installation of the water depth; with the increase in pore size and decreased. In the process of increasing the aeration volume from 0.5 m3/h to 3 m3/h, the total oxygen mass transfer coefficient and oxygenation capacity gradually increased, and the oxygen utilisation rate decreased.

Nrụpụta ike usoro iwu bụ naanị ihe na-egosi ịdị irè. N'ọnọdụ ule, ike usoro ike na-arụ ọrụ na ikuku na ntinye nke omimi mmiri na-abawanye, na-abawanye na oghere mbụ na-abawanye wee belata. Ntinye nke omimi mmiri na oghere kwesịrị ịbụ ngwakọta ezi uche dị na ya iji mee ka arụmọrụ oxygenation nweta ihe kacha mma, n'ozuzu ya, ihe omimi nke nhọrọ mmiri nke aerator aperture ka ukwuu.

Nsonaazụ ule na-egosi na ekwesighi iji ikuku mmiri na-emighị emi mee ihe. N'ime omimi nke nrụnye nke 2 m, ụda ikuku nke 0.5 m3/h na igwe ikuku nwere oke nha nke 200 μm rụpụtara oke ike usoro ihe omume nke 1.97 kg/(kW-h).