ABSTRAK
Telah dilakukan penelitian mengenai pengaruh penambahan bentonit pada membran zeolit terhadap filtrasi zat warna procion red mx 8b dan mekanismenya. Tujuan dari penelitian ini adalah untuk menentukan pengaruh penambahan konsentrasi bentonit dan tekanan operasional membran terhadap permeabilitas, selektivitas dan mekanisme fouling terhadap procion red mx 8b. Membran komposit dibuat dengan metode press pellet sehingga menghasilkan disk membran dengan ukuran diameter ± 11 mm dan ketebalan ± 3 mm kemudian dikalsinasi dengan suhu 850 °C. Pada penelitian ini digunakan berbagai variasi komposisi bentonit (0, 20, 40, 50, 60, 80 dan 100 %). Sifat fisik dan pori membran ditentukan berdasarkan metode standard untuk pengujian membran keramik. Filtrasi procion red mx 8b dilakukan menggunakan sistem dead-end pada variasi tekanan (5, 10, 15, dan 20 Psi). Mekanisme fouling pada membran ditentukan berdasarkan model Hermia. Hasil penelitian menunjukan bahwa penambahan bentonit meningkatkan sifat mekanik dan selektivitas membran namun menurunkan permeabilitas membran. Sedangkan peningkatan tekanan operasional membran meningkatkan permeabilitas membran. Dari hasil analisis permeabilitas diperoleh bahwa fouling pada membran terjadi melalui 3 tahap. Secara umum pada membran terjadi 4 mekanisme, dimana mekanisme complete blocking paling mendominasi. Complete blocking, intermediet blocking, standard blocking, dan cake layer formation atau kombinasinya ditemukan selama proses filtrasi berdasarkan kondisi operasional pengujian.
Kata kunci : Bentonit, Mekanisme fouling, Membran keramik, Procion red mx 8b,
Zeolit.
ABSTRACT
The influences of bentonite addition in zeolite membranes towards procion red mx 8b dyes filtration and its mechanism were investigated. The purposes of this study are to determine the effect of bentonite concentration and trans membrane pressure on membrane permeability, selectivity, and fouling mechanism towards procion red mx 8b. The composite membrane have been obtained from composite materials by pellet-pressed in disk with diameter ± 11 mm and thickness ± 3 mm and calcined at 850 °C. In this study difference composition of bentonite (0, 20, 40, 50, 60, 80 and 100%) were chosen. Physical and pore properties of membrane were determined by standar method of ceramic membrane. The filtration of procion red mx 8b was performed at difference trans membrane pressures with dead-end system (5, 10, 15 and 20 Psi). Hermia model were used to obtain fouling mechanism in membranes. The results show that addition of bentonite increasing mechanical and selectivity of membrane but decreasing permeability of membrane. Increasing trans membrane pressure improve permeability of membrane. Permeability test result that fouling in membrane occur through 3 steps, where complete blocking mechanism is the most dominated. Complete blocking, intermediate blocking, standard blocking and cake layer formation or a combination of them were found to occur during the microfiltration experiments depending on the operating conditions tested.
Keywords: Bentonite, Ceramic membrane, Fouling mechanism, Procion red mx 8b,
Zeolite.