Pehea e hana ai me RO membrane fouling

ʻO ka membrane fouling e pili ana i ka mea hiki ʻole ke hoʻohuli ʻia i loko o nā ʻāpana, colloidal particles, a i ʻole solute macromolecules i loko o ka hopena hānai e pili ana i ka membrane adsorb a waiho ʻia ma ka ʻili o ka membrane a i ʻole nā ​​pores ma muli o ka pilina kino a i ʻole kemika me ka membrane, a i ʻole ka polarization hoʻohālikelike e hoʻonui ai i kekahi mau solutes i ko lākou solubility a me nā hopena mechanical, e hopena ai i ka emi ʻana o ka membrane a me ka nui o ka puʻu.

ʻO ka hoʻohaumia microbial

1） Nā kumu o kona hoʻokumu ʻana

ʻO ka hoʻohaumia ʻana i ka microbial e pili ana i ke ʻano o ka hōʻiliʻili ʻana o nā microorganisms ma ka pā wai membrane, a laila e pili ana i ka hana ʻōnaehana. Hoʻonui a ulu kēia mau microorganism me ka hoʻohana ʻana i nā membrane reverse osmosis ma ke ʻano he mea lawe a me nā meaʻai mai ka ʻāpana wai paʻa o ka reverse osmosis, e hana ana i kahi papa biofilm ma ka ʻili o ka membrane reverse osmosis. Ke alakaʻi nei kēia i ka piʻi wikiwiki ʻana o ka ʻokoʻa kaomi ma waena o ka inlet a me ka puka o ka ʻōnaehana reverse osmosis, ka emi wikiwiki o ka hana wai a me ka helu desalination, a me ka haumia o ka wai huahana. Hiki i nā biofilms i haku ʻia me nā microorganisms pololei (ma ka hana enzymatic) a i ʻole (ma o ka pH kūloko a i ʻole ka hōʻemi ʻana i ka hiki) ke hoʻohaʻahaʻa i nā polymers membrane a i ʻole nā ​​​​mea ʻāpana osmosis reverse, e hopena i ka pōkole ola o ka membrane, ka pōʻino i ka pono o ka ʻōnaehana membrane, a me nā hemahema ʻōnaehana nui.

2) Ke ala hoʻomalu

Hiki ke hoʻokō ʻia ke ʻano hoʻomalu o ka pollution biological ma ka hoʻomau ʻana a i ʻole intermittently sterilizing a disinfecting i ka wai e komo mai. Pono e hoʻokomo ʻia nā mea hoʻomaʻemaʻe a me ka dosing no ka wai maka i hōʻiliʻili ʻia mai ka ʻili a me ka pāpaʻu ma lalo o ka lepo, a pono e hoʻohui ʻia nā fungicides chlorine. Hoʻokumu ʻia ka dosage ma ke koena o ka chlorine content i loko o ka mana i ʻoi aku ma mua o 1mg/L.

ʻO ka hoʻoheheʻe ʻana i nā kemika

1) Nā kumu o kona hoʻokumu ʻana

ʻO nā kumu maʻamau o ka hoʻohaumia kemika ʻo ia ka waiho ʻana o ka unahi carbonate i loko o nā ʻāpana membrane, ʻo ia ka mea ma muli o ka hana hewa ʻole, ka ʻōnaehana dosing inhibitor scale incomplete, a me ka hoʻopau ʻana i ka dosing inhibitor scale i ka wā o ka hana. Inā ʻaʻole ʻike ʻia i ka manawa kūpono, ʻo ke ʻano o ka piʻi ʻana o ke kaomi hana, ka hoʻonui ʻana i ka ʻokoʻa, a me ka emi ʻana o ka nui o ka hana wai e hiki mai i loko o kekahi mau lā. Inā ʻaʻole i kūlike ka mea hoʻopaneʻe unahi i koho ʻia me ka maikaʻi o ka wai a i ʻole lawa ʻole ke ʻano, e hana pū ʻia ka scaling i loko o ka mea membrane. Hiki ke hoʻihoʻi hou ʻia ka scaling maʻalahi i loko o ka mea membrane i kāna hana ma o ka hoʻomaʻemaʻe kemika, a i nā hihia koʻikoʻi, hiki ke hoʻopau ʻia kekahi mau mea membrane i haumia loa.

2) Ke ala hoʻomalu

ʻO ke ala hoʻomalu e pale aku ai i ka scaling i loko o ka mea membrane, ʻo ia ke koho mua i kahi mea hoʻopaneʻe reverse osmosis scale kūpono no ka maikaʻi o ke kumu wai o ka ʻōnaehana, a hoʻoholo i ke ʻano kūpono. ʻO ka lua, e hoʻoikaika i ka nānā ʻana i ka ʻōnaehana dosing, e nānā pono i nā loli maʻalahi i nā ʻāpana hana, a ʻike koke i ke kumu o nā mea ʻino. Eia kekahi, ʻo ka nui o ka Fe3 + i loko o ka wai i kumu nui ʻia e nā ʻōnaehana pipeline. No laila, pono e hoʻohana ʻia nā pipeline plastik i hoʻopaʻa ʻia i ke kila e like me ka hiki no nā pipeline ʻōnaehana, me nā pipeline kumu wai, e hōʻemi i ka ʻike Fe3+.

ʻO nā mea ʻala i hoʻopaʻa ʻia a me ka pollution colloidal

1) Nā kumu o kona hoʻokumu ʻana

ʻO nā ʻāpana i hoʻokuʻu ʻia a me nā colloids nā mea nui e hoʻopaʻa ai i nā membrane osmosis, a ʻo ia hoʻi ke kumu nui o ka ʻoi aku o ka effluent SDI (sludge density index). Ma muli o nā ʻokoʻa o nā kumu wai a me nā ʻāpana, nui nā ʻano like ʻole o ka hoʻohui ʻana o nā ʻāpana a me nā colloids. ʻO nā mea nui o ka wai i hoʻohaumia ʻole ʻia a me ka wai pāpaʻu he bacteria, pālolo, colloidal silica, iron oxides, humic acid huahana, a me ka hoʻokomo ʻana i nā coagulants a me nā coagulants (e like me nā paʻakai hao, nā paʻakai alumini, etc.) i ka ʻōnaehana pretreatment. Eia kekahi, ʻo ka ua i hoʻokumu ʻia e ka hui ʻana o nā polymers i hoʻopiʻi maikaʻi ʻia i ka wai maka a me nā mea hoʻopiʻi pālākiʻi ʻino i nā ʻōnaehana reverse osmosis kekahi o nā kumu o ia pollution.

2) Ke ala hoʻomalu

Ke ʻoi aku ka nui o nā mea paʻa i hoʻopaʻa ʻia i loko o ka wai maka ma mua o 70mg/L, hoʻohana mau ʻia ka coagulation, clarification, a me ka kānana mua ʻana; Ke emi mai ka 70mg/L o ka mea paʻa paʻa i hoʻokuʻu ʻia i loko o ka wai maka, hoʻohana mau ʻia ka kānana coagulation no ka mālama mua ʻana; Ke emi mai ka 10mg/L o nā mea paʻa paʻa i hoʻokuʻu ʻia i loko o ka wai maka, hoʻohana mau ʻia ke ʻano hoʻomaʻamaʻa kānana pololei. Eia kekahi, ʻo ka microfiltration a i ʻole ka ultrafiltration kahi ʻano hana lapaʻau membrane kūpono no ka turbidity a me nā mea organik insoluble i puka mai nei. Hiki iā ia ke hoʻoneʻe i nā mea paʻa paʻa, bacteria, ka nui o nā colloids, a me nā mea olaola ʻole, a he kaʻina hana mua kūpono no nā ʻōnaehana reverse osmosis.