Ukwelashwa kwamanzi angcolile: ukukhetha phakathi kwe-polyaluminium chloride ne-aluminium sulfate

Emkhakheni wokwelashwa kwamanzi amdaka, kokubili i-polyaluminum chloride (PAC) kanye ne-aluminium sulfate kusetshenziswa kabanzi njenge-ama-coagulant. Kunomehluko esakhiweni samakhemikhali salezi zinto ezimbili, okuholela ekusebenzeni nasekusetshenzisweni kwazo. Eminyakeni yamuva nje, i-PAC iye yathandwa kancane kancane ngenxa yokusebenza kwayo okuphezulu kokwelapha kanye nesivinini. Kulesi sihloko, sizoxoxa ngomehluko phakathi kwe-PAC kanye ne-aluminium sulfate ekuphathweni kwamanzi amdaka ukuze sikusize wenze ukukhetha okunolwazi oluthe xaxa.

Okokuqala, ake sifunde nge-polyaluminum chloride (PAC). Njenge-inorganic polymer coagulant, i-PAC inokuncibilika okuhle kakhulu futhi ingakha ama-floc ngokushesha. Idlala indima yokujiya ngokusebenzisa ukungathathi hlangothi kukagesi kanye nokubamba inethi, futhi isetshenziswa kanye ne-flocculant PAM ukususa ukungcola emanzini angcolile ngempumelelo. Uma kuqhathaniswa ne-aluminium sulfate, i-PAC inamandla okucubungula aqinile kanye nekhwalithi yamanzi engcono ngemva kokuhlanzwa. Okwamanje, izindleko zokuhlanzwa kwamanzi ze-PAC ziphansi ngo-15%-30% kune-aluminium sulfate. Ngokuphathelene nokusebenzisa i-alkalinity emanzini, i-PAC inokusetshenziswa okuphansi futhi inganciphisa noma ikhansele ukujova kwe-alkaline agent.

Okulandelayo yi-aluminium sulfate. Njenge-coagulant yendabuko, i-aluminium sulfate imunca futhi ijiye ukungcola ngama-colloids e-aluminium hydroxide akhiqizwa yi-hydrolysis. Izinga layo lokuncibilika liphansi kakhulu, kodwa lifanele ukwelashwa kwamanzi amdaka nge-pH engu-6.0-7.5. Uma kuqhathaniswa ne-PAC, i-aluminium sulfate inamandla okwelapha aphansi kanye nekhwalithi yamanzi ahlanziwe, futhi izindleko zokuhlanzwa kwamanzi ziphakeme kakhulu.

Ngokuphathelene nobukhulu bokusebenza, i-PAC kanye ne-aluminium sulfate kunezinhlelo zokusebenza ezihlukile kancane; i-PAC ngokuvamile kulula ukuyiphatha futhi yakha ama-floc ngokushesha, okuthuthukisa ukusebenza kahle kokwelashwa. I-aluminium sulfate, ngakolunye uhlangothi, iyephuza ukumanzisa futhi ingathatha isikhathi eside ukujiya.

I-aluminium sulfatekuzonciphisa i-pH kanye nokuguquguquka kwamanzi aphathwe, ngakho-ke i-soda noma i-lime iyadingeka ukuze kuncishiswe umphumela. Isixazululo se-PAC sicishe sibe singathathi hlangothi futhi asidingi noma iyiphi i-neutralizing agent (i-soda noma i-lime).

Ngokuphathelene nokugcinwa, i-PAC kanye ne-aluminium sulfate ngokuvamile zizinzile futhi kulula ukuzigcina nokuzithutha. Ngenkathi i-PAC kufanele ivalwe ukuze kuvinjelwe ukumuncwa komswakama kanye nokuvezwa elangeni.

Ngaphezu kwalokho, ngokombono wokugqwala, i-aluminium sulfate kulula ukuyisebenzisa kodwa igqwala kakhulu. Lapho ukhetha ama-coagulant, umthelela ongaba khona kokubili emishinini yokwelapha kufanele ucatshangelwe ngokugcwele.

Ngokufigqiwe,I-Polyaluminum Chloride(PAC) kanye ne-aluminium sulfate zinezinzuzo nezinkinga zazo ekuphathweni kwendle. Sekukonke, i-PAC kancane kancane iba yi-coagulant eyinhloko ngenxa yokusebenza kwayo kahle kakhulu, ikhono lokwelapha amanzi amdaka ngokushesha kanye nokuzivumelanisa nezimo okubanzi kwe-pH. Kodwa-ke, i-aluminium sulfate isenezinzuzo ezingenakuphikwa ngaphansi kwezimo ezithile. Ngakho-ke, lapho ukhetha i-coagulant, izici ezifana nesidingo sangempela, umphumela wokwelapha kanye nezindleko kufanele zicatshangelwe. Ukukhetha i-coagulant efanele kuzosiza ekuthuthukiseni ukusebenza kahle kokwelashwa kwamanzi amdaka.