Ngaahi Meʻa Tefito ʻo e Osimosisi Fakafoki

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Ko e Hā ʻa e Osimosisi Fakafoki?

Ko e osimosisi fakafoki (RO) ko ha founga vaheʻi ʻaki ha membrane ʻoku vilingia ʻe he mafatukituki, ʻoku ne toʻo ʻa e māsima kuo mole, meʻa ʻōkeniki, meʻa moʻui iiki, mo e meʻa iiki mei he vai. ʻI hono teketeke ʻo e vai fakahū ʻi ha membrane semi-permeable ʻi ha mafatukituki ʻoku māʻolunga ange ʻi he mafatukituki osimotiki fakanatula ʻo e vai, ʻoku ngaohi ʻe he RO ha tafe vai hū māsima siʻi mo ha tafe vai fefeka (vai fefeka pe vai māsima).

Naʻe fuofua fakamatalaʻi ʻa e osimosisi ʻe Jean-Antoine Nollet ʻi he 1748, ka naʻe toki lava ke ngāue ʻa e osimosisi fakafoki ʻi he 1950 mo e 1960 ʻi he taimi naʻe fakatupu ai ʻe Sidney Loeb mo Srinivasa Sourirajan ʻi he UCLA ʻa e ʻuluaki membrane cellulose acetate taʻe-fetatauʻaki naʻe lava ʻo maʻu ha flux mo ha taʻofi ʻaonga. Naʻe hoko ʻi he 1970 ʻa e fakafeʻiloaki ʻo e ngaahi membrane polyamide thin-film composite (TFC) ʻe John Cadotte ʻi he FilmTec (ʻoku kau he ʻaho ni ki he DuPont), ʻa ia ʻoku kei tuʻu ko e kemikale tefito ki he RO vai kona siʻi mo e vai tahi ʻo e ʻaho ni.

Founga Ngāue ʻa e RO: Ko e Saienisi

ʻI he osimosisi fakanatula, ʻoku tafe ʻa e vai ʻi ha membrane semi-permeable mei ha feituʻu ʻoku siʻi ai ʻa e meʻa kuo mole ki ha feituʻu ʻoku lahi ai, ʻo fakatatau ai ʻa e malohi kemikale. Ko e mafatukituki ʻe fie maʻu ke fakaʻaiʻai ki he tafaʻaki fefeka ke taʻofi ʻa e tafe ni ʻoku ui ko e mafatukituki osimotiki (π). Ki he vai tahi ʻi he 35,000 mg/L TDS, ko e π ko e meimei 28 bar (~400 psi) ʻi he 25 °C, ʻoku lau ʻaki ʻa e fakafuofua van’t Hoff:

π = i · C · R · T

ʻa ia: i ko e faktā van’t Hoff, C ko e fefeka molar, R ko e tuʻunga kasa, pea T ko e māfana kakato.

ʻI he osimosisi fakafoki , ʻoku ngāue ʻaki ha mafatukituki fakahū ʻoku lahi ange ʻi he π ke vilingia ʻa e vai ki he tafaʻaki kehe — mei he fefeka ki he manifi — ʻo tuku ʻa e ngaahi meʻa kuo mole ki mui. Ko e mafatukituki vilingia moʻoni (NDP) ʻoku ne pule ki he flux:

NDP = (P_feed − ΔP/2) − P_permeate − (π_feed − π_permeate)

Ngaahi mafatukituki ngāue angamaheni: RO vai ʻo e paipa 7–14 bar (100–200 psi), RO vai kona siʻi 10–25 bar (150–360 psi), RO vai tahi 55–82 bar (800–1,200 psi).

Ko e Founga RO ʻi he Sitepu mo e Sitepu

1. Maʻu vai mo e tokanga muʻa. ʻOku fakamama ʻa e vai maʻu mei tuʻa, ʻoku lava ke fakataha ʻa e meʻa iiki, pea tātā (multimedia pe ultrafiltration) ke fakasiʻisiʻi ʻa e ʻuli mo e meʻa ʻoku tautau. ʻOku fakamahu ʻa e antiscalant ke taʻofi ʻa e tānaki fefeka ʻo e CaCO₃, CaSO₄, BaSO₄, SrSO₄, mo e silica. ʻOku toʻo ʻa e kolo taʻehaʻi (SMBS pe karapone) ke maluʻi ʻa e ngaahi membrane polyamide.
2. Pamu mafatukituki māʻolunga. Ko ha pamu centrifugal sitepu lahi, pamu axial piston, pe pamu triplex plunger ʻoku ne hiki hake ʻa e mafatukituki fakahū ke māʻolunga ange ʻi he mafatukituki osimotiki ʻo e feituʻu fefeka taha ʻi he funga ʻo e membrane.
3. Vaheʻi ʻe he membrane. ʻOku hū ʻa e vai fakahū ki he ipu mafatukituki ʻoku muʻomuʻa pea tafe fakatafaʻaki ʻi he ngaahi meʻa membrane takatakai. ʻOku hū ʻa e vai ʻi he kahi taʻofi polyamide ki he ʻalunga vai hū ʻi loto; ʻoku fakafefeka ʻa e māsima kuo mole ʻi he tafe vai māsima ʻoku hū mei he ipu fakaʻosi.
4. Fakaakeake malohi (SWRO). ʻOku kei ʻi ai ʻi he tafe vai māsima mafatukituki māʻolunga ʻa e 55–70 bar ʻo e malohi ʻoku ala ngāue ʻaki. ʻOku fetuku ʻe he ngaahi meʻa fakaakeake malohi (meʻa fetongi mafatukituki pe turbocharger) ʻa e mafatukituki ko ia ki he vai fakahū ʻoku hū mai, ʻo fakasiʻisiʻi ai ʻa e kavenga ʻo e pamu tefito.
5. Tokanga hili. ʻOku toe fakamineral ʻa e vai hū (calcite contactor pe CO₂ mo e laimi), fakatonutonu ʻa e pH, fakamaʻa (UV pe kolo), pea ʻoatu ki he tauhiʻanga.

Ngaahi Konga Mahuʻinga ʻo ha Sisitemi RO

• Laine tokanga muʻa — tātā multimedia, tātā cartridge (angamaheni 5 µm), fakamahu antiscalant, toʻo kolo (SMBS pe karapone), ʻoku faʻa ʻi ai mo e UF ʻi he ngaahi vai faingataʻa.
• Pamu mafatukituki māʻolunga — Grundfos CR sitepu lahi, CAT triplex plunger, Danfoss APP axial piston, FEDCO MSD/MSS ʻo fakatatau ki he tafe mo e mafatukituki.
• Ngaahi meʻa membrane — ngaahi meʻa takatakai 8″ × 40″ (DuPont FilmTec SW30, Hydranautics SWC, Toray TM820, LG NanoH2O). Ko e lahi 4″ mo e 2.5″ ki he ngaahi sisitemi iiki ange.
• Ngaahi ipu mafatukituki — ngaahi fale FRP (Codeline 80S100, Pentair, Bel) ʻoku nau puke ʻa e meʻa ʻe 1–8 ʻi he hokohoko.
• Meʻa fakaakeake malohi — ngaahi meʻa fetongi mafatukituki ERI PX pe ngaahi turbocharger FEDCO HPB ki he SWRO.
• Ngaahi meʻa pule mo fua — PLC (Allen-Bradley CompactLogix, Siemens S7-1200), mita tafe, conductivity, meʻa fua mafatukituki, ORP, pH.
• Tokanga hili — toe fakamineral, fakatonutonu pH, fakamaʻa UV, tānaki kolo.

RO mo e Ngaahi Founga Tokanga Vai Kehe

Founga	ʻOku Toʻo	Malohi	Lelei Taha Ki
Osimosisi Fakafoki	Ngaahi ione, meʻa ʻōkeniki, meʻa moʻui iiki, meʻa iiki	2.5–8 kWh/m³	Fakamāsima vai tahi mo e vai kona siʻi, vai maʻa ʻaupito
Fakalili (MED/MSF)	Tatau mo e RO mo e ngaahi meʻa ʻōkeniki ʻoku ʻau	10–25 kWh/m³ fakatatau ki he māfana	ʻI he feituʻu ʻoku taʻetotongi ai ʻa e māfana liʻaki; vai ʻuli lahi
Fetongi ʻo e Ione	Ngaahi ione pau (Ca, Mg, NO₃)	ʻUhila siʻi, kemikale lahi ki he fakafoʻou	Fakamolū, fakamaʻa ʻo e vai TDS māʻulalo
Ultrafiltration (UF)	Meʻa ʻoku tautau, siemu, mo e ʻuluʻulu ʻe niʻihi	0.1–0.5 kWh/m³	Tokanga muʻa ki he RO, fakamaʻa vai ʻi ʻolunga
Nanofiltration (NF)	Ngaahi ione divalent, meʻa ʻōkeniki >200 Da	1–3 kWh/m³	Fakamolū, toʻo lanu, fakamāsima konga

Ngaahi Ngāue Angamaheni

• Vai inu ʻa e kolo — fakamāsima ʻo e vai kona siʻi ʻi lalo ʻi he kelekele, ngaahi ʻapi fakamāsima vai tahi (Carlsbad, Sorek, Ras Al-Khair).
• Meʻakai mo e inu — vai ʻi he hina, fakafefeka ʻo e huʻakau, vai ki he ngaohi inu.
• Faitoʻo mo e biotech — Vai Fakamaʻa USP mo e vai fakahū WFI.
• Semiconductor — vai maʻa ʻaupito (UPW) ki hono fufulu ʻo e wafer, ko e RO ʻa e meʻa ngāue tefito ʻi muʻa ʻi he EDI mo e mixed-bed.
• Ngaohi ʻuhila — vai fakahū ki he boiler, vai pule NOx.
• Vaka — ngaahi meʻa ngaohi vai SWRO ʻi he vaka ki he kau ngāue mo e ngāue.
• Ngāue fakapisinisi mo e vai ʻo e tauʻa fakamokomoko — fakasiʻisiʻi ʻa e liʻaki vai ʻi hono toʻo ʻo e ngaahi ione ʻoku faʻu ʻa e fefeka.

Ngaahi Fua ʻo e Ngāue

• Fakaakeake (Y) — Q_permeate / Q_feed. Angamaheni: SWRO hū tuʻo taha 35–50%, BWRO 70–85%, RO vai paipa 50–75%.
• Taʻofi māsima (R) — 1 − (C_permeate / C_feed). Ko e ngaahi membrane SWRO ʻo e ʻaho ni ʻoku >99.7%, BWRO >99.0%.
• Flux (J) — tafe vai hū ʻi he lahi ʻo e membrane, LMH (L/m²/h) pe GFD (gal/ft²/ʻaho). Ko e flux fakataumuʻa ki he SWRO ko e 12–15 LMH (7–9 GFD); BWRO 17–25 LMH (10–15 GFD).
• Ngāue ʻaki malohi pau (SEC) — kWh ʻi he m³ vai hū. Ko e SWRO ʻo e ʻaho ni mo e ERD: 2.5–4.0 kWh/m³.
• SDI (Silt Density Index) — fua ʻo e ʻuli ʻi he vai fakahū ʻo fakatatau ki he ASTM D4189; ko e taumuʻa ki he SWRO ko e SDI₁₅ < 3.
• Faikehekehe ʻo e mafatukituki (ΔP) — ʻi he sitepu taki taha; ko e hiki ʻa e ΔP ʻoku fakaʻilonga ʻuli.

SWRO, BWRO mo e RO Vai Paipa — Ngaahi Fua Angamaheni

Fua	RO Vai Tahi	RO Vai Kona Siʻi	RO Vai Paipa
TDS fakahū (mg/L)	32,000–45,000	1,000–10,000	100–1,000
Mafatukituki ngāue	55–82 bar	10–25 bar	7–14 bar
Fakaakeake	35–50%	70–85%	50–75%
Taʻofi māsima	>99.7%	>99.0%	>97%
Flux fakataumuʻa	12–15 LMH	17–25 LMH	20–30 LMH
SEC (mo e ERD)	2.5–4.0 kWh/m³	0.5–1.5 kWh/m³	0.3–0.8 kWh/m³
Membrane angamaheni	FilmTec SW30HRLE	FilmTec BW30 / LE	FilmTec TW30

Ngaahi Fehālaaki Angamaheni mo e Ngaahi Fehuʻi

ʻOku toʻo ʻe he RO ʻa e ngaahi mineral lelei ʻo ngaohi ha vai taʻemoʻui lelei?

ʻOku toʻo moʻoni ʻe he RO ʻa e ngaahi mineral kuo mole fakataha mo e ngaahi meʻa ʻuli. Ki he ngaahi sisitemi vai inu, ʻoku toe fakafoki ʻe he toe fakamineral ʻi he tokanga hili (calcite contactor, fakamahu laimi, pe CO₂ mo e dolomite) ʻa e calcium mo e bicarbonate ʻoku ʻaonga pea fakatonutonu ʻa e Langelier Saturation Index ke taʻofi ʻa e ʻuli metale ʻi he ngaahi ʻalunga ki mui.

ʻE fēfē hono loloa ʻo e moʻui ʻa e ngaahi membrane RO?

ʻI ha tokanga muʻa totonu, fakamahu antiscalant, mo ha founga CIP, ʻamanaki ki he taʻu ʻe 5–7 ki he SWRO mo e taʻu ʻe 5–10 ki he BWRO. Vakai ki heʻemau tataki tokangaʻi membrane.

Ko e hā ʻoku fakangatangata ai ʻa e fakaakeake ʻi he SWRO?

ʻOku hiki ʻa e mafatukituki osimotiki ʻo e vai māsima ʻi he tupu ʻa e fakaakeake. ʻI he fakaakeake 50% ʻi ha vai fakahū 35,000 mg/L, ko e TDS ʻo e vai māsima ko e ~70,000 mg/L pea ʻoku laka atu ʻa e π ʻi he 55 bar — ʻoku ofi ki he ngataʻanga ʻo e pamu mo e membrane. ʻOku taumuʻa ʻa e lahi taha ʻo e ngaahi faʻu SWRO ki he 40–45%.

Ko e hā ʻa e concentration polarization?

Ko e kahi ʻi he funga ʻo e membrane ʻoku māʻolunga ange ai ʻa e fefeka ʻo e māsima ʻi he vai fakahū kātoa, ʻo fakalahi ai ʻa e mafatukituki osimotiki ʻi he feituʻu ko ia mo e tuʻutāmaki ʻo e tānaki fefeka. ʻOku faʻu ʻa e vave ʻo e tafe fakatafaʻaki mo e faʻu ʻo e feed-spacer ke fakasiʻisiʻi ʻa e faktā β (angamaheni 1.1–1.2).

ʻE lava ʻe he RO ʻo toʻo ʻa e ngaahi kasa kuo mole?

ʻIkai — ʻoku ʻau atu ʻa e CO₂, H₂S, mo e ngaahi kasa kehe kuo mole. ʻOku fie maʻu ha toʻo kasa (tauʻa ʻoku puhi ʻe he ʻea pe membrane contactor) ʻi he feituʻu ʻoku mahuʻinga ai ʻa e toʻo ʻo e kasa.

ʻOku tatau ʻa e RO mo e nanofiltration?

ʻOku lalahi ange ʻa e ngaahi ava ʻo e membrane NF pea ʻoku nau taʻofi muʻa ʻa e ngaahi ione divalent (Ca²⁺, Mg²⁺, SO₄²⁻) kae ʻau atu ʻa e ngaahi ione monovalent (Na⁺, Cl⁻). ʻOku ʻaonga ki he fakamolū mo e toʻo lanu, ʻo ʻikai ki he fakamāsima.