Flocculation - Aluminium sulphate vs Poly aluminium chloride

Flocculation ke mokhoa oo ka oona likaroloana tse emisitsoeng hampe tse teng ka ho emisoa ho tsitsitseng ka metsing li senyeha. Sena se finyelloa ka ho eketsa coagulant e nang le qoso e ntle. The positive qoso ka coagulant neutralizes tefiso e mpe teng ka metsing (ke hore destabilizes eona). Hang ha likaroloana li fokotsehile kapa li fokotsehile, ts'ebetso ea flocculation e etsahala. Likaroloana tse senyehileng li kopana ho ba likaroloana tse kholoanyane le tse kholoanyane ho fihlela li le boima bo lekaneng hore li ka rarolloa ke sedimentation kapa tse kholo hoo li ka tšoarang lipululana tsa moea le ho phaphamala.

Kajeno re tla shebisisa thepa ea flocculation ea li-flocculants tse peli tse tloaelehileng: poly aluminium chloride le aluminium sulfate.

Aluminium Sulfate: Aluminium Sulfate e na le asiti ka tlhaho. Molao-motheo oa ts'ebetso oa aluminium sulfate ke o latelang: aluminium sulfate e hlahisa aluminium hydroxide, Al (0H) 3. Aluminium hydroxides na le e lekanyelitsoeng pH mefuta e fapaneng ya, ka holimo ho moo ba ke ke ka katleho hydrolysis kapa , hydrolyzated aluminium hydroxides rarolloa ka potlako ka pH e phahameng (ke hore pH ka holimo 8.5), kahoo ho sebetsa pH lokela ho ka hloko ho laoloa ho boloka e ka mefuta e fapaneng ya 5.8-8.5. . alkalinity ka metsing e tlameha ho ba e lekaneng nakong ea ts'ebetso ea flocculation ho etsa bonnete ba hore hydroxide e sa tsitsang e thehoa ka ho feletseng le ho fokotseha. E tlosa 'mala le lisebelisoa tsa colloidal ka ho kopanya adsorption le hydrolysis ho/ka har'a metal hydroxides. Ka hona, fensetere ea pH e sebetsang ea aluminium sulfate e tiile ka 5.8-8.5, kahoo ke habohlokoa haholo ho netefatsa taolo e ntle ea pH nakong eohle ea ts'ebetso ha u sebelisa aluminium sulfate.

Polyaluminium chloride(PAC) ke e 'ngoe ea lik'hemik'hale tse sebetsang hantle ka ho fetisisa tsa ho hloekisa metsi tse sebelisoang kajeno. E sebelisoa haholo ho hloekisa metsi a nooang le metsi a litšila ka lebaka la ts'ebetso ea eona e phahameng ea coagulation le mefuta e mengata ka ho fetisisa ea pH le lisebelisoa tsa mocheso ha li bapisoa le lik'hemik'hale tse ling tsa ho hloekisa metsi. PAC e fumaneha ka limaraka tse 'maloa tse fapaneng ka likhakanyo tsa alumina ho tloha ho 28% ho isa ho 30%. Alumina concentration ha se eona feela ntho eo ho nahanoang ka eona ha u khetha hore na u sebelise sehlopha sefe sa PAC.

PAC e ka nkoa e le pre-hydrolysis coagulant. The pre-hydrolysis aluminium clusters have a high very high positive charge density, e leng se etsang hore PAC more cationic feta alum.e etsa hore e be destabilizer e matla bakeng sa litšila tse fanyehiloeng hampe ka metsing.

PAC e na le melemo e latelang ho feta aluminium sulfate

1. E sebetsa maemong a tlase haholo. E le molao oa letsoho, lethal dose la PAC ke karolo ea boraro ea lethal dose le hlokehang bakeng sa alum.

2. E siea aluminium e fokolang e setseng ka metsing a hloekisitsoeng

3. E hlahisa seretse se fokolang

4. E sebetsa ho feta pH e pharaletseng

Ho na le mefuta e mengata ea li-flocculants, 'me sehlooho sena se hlahisa tse peli feela tsa tsona. Ha u khetha coagulant, u lokela ho nahana ka boleng ba metsi ao u a phekolang le tekanyetso ea hau ea litšenyehelo. Ke tšepa hore u na le phihlelo e ntle ea ho hloekisa metsi. Joaloka mofani oa lik'hemik'hale oa phekolo ea metsi ea nang le phihlelo ea lilemo tse 28. Ke thabetse ho rarolla mathata a hau kaofela (mabapi le lik'hemik'hale tsa ho hloekisa metsi).