PRALAKUAN
KOAGULASI DALAM PROSES PENGOLAHAN
AIR
DENGAN MEMBRAN: PENGARUH WAKTU
PENGADUKAN
PELAN KOAGULAN ALUMINIUM SULFAT
TERHADAP
KINERJA MEMBRAN
Eva
Fathul Karamah, Andrie Oktafauzan Lubis
Program
Studi Teknik Kimia, Departemen Teknik Gas & Petrokimia
Fakultas
Teknik Universitas Indonesia, Depok 16424, Indonesia
Abstract
To prolong
membrane’s lifetime and improve its removal performances in the water treatment
process, the microfiltration feed has to be pretreated by
coagulation-flocculation. The successful coagulation-flocculation and finally
the membrane’s performance are strongly influenced by time of coagulant slow
mixing. In this research, the time of this slow mixing is varied from 5, 10,
15, 20 and 25 minutes. The feed water pH is 7,3, with Total Dissolved Solid
(TDS) of 524-540 mg/L and Chemical Oxygen Demandn (COD) of 45-54 mg/L. The
coagulant that is used is 50 ppm dosage of Aluminum Sulphate. Coagulation
effectivity and microfiltration membrane performances increase with increasing
time of slow mixing until the optimum time is reached. The optimum time
resulted from this research is 10
