nūhou

Introduction to pre-coating filtration

Ka mea i kapaia pre-coating filtration mea e hoʻohui i kekahi huina o ka kānana kōkua i loko o ka filtration kaʻina, a ma hope o ka pōkole manawa, he paʻa kānana pre-coating i hoʻokumu 'ia ma luna o ka mea kānana, e huli maʻalahi media ili kānana i loko o ka hohonu kānana, ka hopena i ka ikaika hoʻomaʻemaʻe a me kānana hopena. ʻO nā kōkua kānana maʻamau ka perlite, cellulose, diatomaceous earth, carbon black and asbestos. Ua hoʻohana nui ʻia ke kōkua kānana diatomite ma muli o kāna mau pono piha i ka hana, kumukūʻai, kumu a me nā mea ʻē aʻe.

Ke kumu o ka kānana ʻana ma mua o ka uhi ʻana

Hoʻohana ʻia ka pauma kānana e hoʻokuʻu i ka hoʻokuʻu ʻana i loko o ka pahu kānana, a ma hope o ka manawa o ka holo ʻana, ua hoʻopili ʻia ke kōkua kānana ma luna o ka ʻili o ka mea kānana e hana i kahi kānana pre-coating layer me nā pores paʻakikī a maikaʻi. Ma muli o ka loaʻa ʻana o ka pre-coating, loaʻa ka pololei filtration kiʻekiʻe i ka pae mua o ka pae aʻe o ka kānana, a hiki nō hoʻi ke pale i nā ʻāpana lepo mai ka hoʻopaʻa ʻana i nā pores o ka mea kānana. I loko o ke kaʻina kānana, ua hui pū ʻia nā ʻāpana paʻa i loko o ka hoʻokuʻu ʻia me nā ʻāpana honua diatomaceous i hoʻohui mau ʻia ma ke ʻano quantitative a laila hōʻuluʻulu ʻia ma luna o ka mea kānana e hana i kahi keke kānana wehe, i paʻa maoli ka filtration rate.

Nā ʻano o ke kōkua kānana diatomite

Hiki mai nā huahana kōkua kānana diatomite i nā kala like ʻole. ʻO kāna ʻāpana kumu he pā pōhaku siliceous porous. ʻO nā hōʻailona hana nui ka nui o ka ʻāpana, ka nui o ka nui, ka ʻili o ka ʻili kikoʻī, a me nā ʻāpana ʻāpana. Ma waena o lākou, ʻo ka hāʻawi ʻana i ka nui o nā ʻāpana kekahi o nā hōʻailona hana koʻikoʻi. Hoʻoholo pololei ia i ka nui o nā pores kānana a me ka hāʻawi ʻana i nā micropores. ʻOi aku ka maikaʻi o ka wai permeability o nā ʻāpana coarse-grained, akā ʻoi aku ka haʻahaʻa o ka kānana pono ʻana, no laila e hoʻokō ʻia ka pono kahe e pono ai a me ka pololei kānana. , E koho i ka mānoanoa kūpono o ka honua diatomaceous. Hoʻokaʻawale ʻia nā huahana i hana ʻia i loko o ʻelua ʻano mānoanoa, hiki ke hoʻohana wale ʻia a i hui pū ʻia me nā mānoanoa like ʻole a me ka nui o nā ʻāpana e loaʻa ai ka pololei kānana kiʻekiʻe. He mana nui ka nui o ka diatomite i ka hopena kānana. ʻO ka liʻiliʻi o ka puʻupuʻu nui, ʻoi aku ka nui o ka nui o ka pore o nā mea kōkua kānana, a ʻo kona permeability a me adsorption pono e hoʻomalu ʻia i ka wā o ka hana pre-coating. ʻO ka neʻe ʻana o ka diatomite medium a me ke kahe kahe o ka hoʻonā ʻana i ka hoʻopili mua e hiki ai i nā ʻāpana diatomite ke hoʻopaʻa i ka hoʻokumu ʻana o ka uhi mua. ʻO ka nui o ka diatomite he 0.3 a hiki i ka 0.6%, a hiki ke hoʻonohonoho ʻia ke kahe kahe ʻana i ka 1 a 2 mau manawa o ka kahe kahe maʻamau. ʻO ke kaomi mua o ka uhi ʻana ma kahi o 0.1MPa.