Txiv qaub Phosphorus Tshem Tawm
Kev tshem tawm cov txiv qaub phosphorus suav nrog ntxiv cov txiv qaub kom hnov mob nrog phosphates, tsim hydroxyapatite precipitate.
Txij li thaum cov txiv qaub reacts nrog alkalinity ntawm cov dej ua ntej tsim calcium carbonate precipitate, tsuas yog calcium ions ntau heev react nrog phosphates los ua hydroxyapatite precipitate. Yog li ntawd, tus nqi ntawm txiv qaub yuav tsum tau nyob ntawm qhov alkalinity ntawm cov dej khib nyiab, tsis yog nws cov ntsiab lus phosphate.
Tsis tas li ntawd, magnesium hardness ntawm cov dej khib nyiab kuj cuam tshuam rau cov txiv qaub phosphorus tshem tawm. Nyob rau theem siab pH, tsim Mg (OH) ₂ precipitate yog colloidal precipitate, uas tsis tsuas yog siv cov txiv qaub tab sis kuj cuam tshuam sludge dewatering.
pH muaj qhov cuam tshuam loj rau kev tshem tawm cov txiv qaub phosphorus. Raws li pH nce, lub solubility ntawm hydroxyapatite txo qis, lub ntsiab lus ntawm phosphorus tshem tawm tus nqi nce. Tshaj pH 9.5, tag nrho cov phosphates hauv dej ua insoluble precipitates. Feem ntau, tswj pH ntawm 9.5 thiab 10 yields qhov zoo tshaj plaws phosphorus tshem tawm cov nyhuv.
Tus nqi ntawm txiv qaub ntxiv rau ntau hom dej khib nyiab yuav tsum tau txiav txim siab sim.
Muaj peb txoj hauv kev tshwj xeeb rau kev tshem tawm cov txiv qaub phosphorus. Muaj peb txoj hauv kev tseem ceeb ntawm kev tshem tawm cov phosphorus: 1) Ntxiv cov txiv qaub ua ntej lub hauv paus sedimentation tank hauv cov nroj tsuag dej khib nyiab; 2) Ntxiv cov txiv qaub tom qab cov tshuaj lom neeg lub tank nyob rau hauv lub thib ob sedimentation tank; thiab 3) Ntxiv txiv qaub tom qab kev kho mob lom thiab siv cov txheej txheem recarbonation.
Aluminium ntsev phosphorus tshem tawm
Cov neeg sawv cev zoo tshaj plaws rau kev tshem tawm cov ntsev phosphorus yog aluminium sulfate thiab sodium aluminate. Qhov txawv yog tias ntxiv aluminium sulfate txo qis pH ntawm cov dej khib nyiab, thaum ntxiv sodium aluminate nce pH. Yog li ntawd, aluminium sulfate thiab sodium aluminate yog tsim rau kev kho alkaline thiab acidic khib nyiab, raws li.
Qhov sib ntxiv ntawm txhuas ntsev yog hloov tau yooj yim. Lawv tuaj yeem muab ntxiv ua ntej lub hauv paus sedimentation tank, nyob rau hauv lub aeration tank, los yog nruab nrab ntawm lub aeration tank thiab lub thib ob sedimentation tank. Kev tshem tawm cov tshuaj phosphorus tuaj yeem raug cais tawm los ntawm kev kho cov kab mob lom, siv cov dej hauv cov dej hauv nruab nrab uas yog cov dej nyoos rau coagulation pom, lossis ntxiv cov ntsev txhuas ua ntej lim rau micro-flocculation filtration.
Ntxiv cov ntsev txhuas ua ntej lub hauv paus sedimentation tank tuaj yeem txhim kho tus nqi tshem tawm ntawm cov organic teeb meem thiab tshem tawm cov khib nyiab (SS) hauv thawj lub tank sedimentation. Ntxiv lawv nruab nrab ntawm lub aeration tank thiab lub thib ob sedimentation tank, qhov twg turbulence nyob rau hauv cov channel los yog cov kav dej yuav pab txhim kho cov nyhuv ntawm cov reagents, los yog ntxiv rau lawv tom qab kev kho mob lom system, raws li hydrolysis ntawm phosphorus los ntawm kev kho mob lom yuav ntxiv dag zog rau phosphorus tshem tawm.
Vim muaj kev cuam tshuam ntawm cov dej khib nyiab alkalinity thiab cov organic teeb meem, cov tshuaj tiv thaiv rau phosphorus tshem tawm yog ib txoj kev nyuaj. Yog li, qhov zoo tshaj plaws ntawm cov ntsev txhuas tsis tuaj yeem txiav txim siab los ntawm kev suav thiab yuav tsum tau txiav txim siab sim.
Ferric ntsev phosphorus tshem tawm
Ferric chloride, ferrous chloride, ferrous sulfate, thiab ferric sulfate tuaj yeem siv rau kev tshem tawm phosphorus, nrog ferric chloride feem ntau siv.
Zoo ib yam li txhuas ntsev, ntau cov ferric chloride yuav tsum tau hnov mob nrog alkalinity los tsim Fe (OH) 3, yog li txhawb cov nag lossis daus thiab sib cais ntawm colloidal ferric phosphate. Qhov zoo tshaj pH ntau rau ferric phosphate nag lossis daus yog 4.5-5.0. Hauv kev siv cov tswv yim, pH ntawm ib ncig ntawm 7 lossis siab dua tseem muab cov txiaj ntsig zoo phosphorus tshem tawm.
Ntxiv kwv yees li 45-90 mg / L ntawm ferric chloride rau hauv nroog cov dej khib nyiab tuaj yeem tshem tawm 85% -90% ntawm phosphorus. Zoo ib yam li cov ntsev txhuas, cov ntsev ferric tuaj yeem muab ntxiv rau ntawm qhov kev kho mob ua ntej, kev kho mob thib ob, lossis kev kho mob tertiary.