Syntesis and Characterization of Cellulose Asetate Membranes Used in Pulp Waste Water Treatment  

Oleh:

Linny N. ; Milka Y. ; Soeseno, Natalia ; Tokok A.

Jenis: Article from Bulletin/Magazine
Dalam koleksi: Jurnal Teknologi Industri dan Informasi vol. 3 no. 2 (Aug. 2002), page 101-109.
Topik: CELLULOSE; synthesis; characteriztion; cellulose astate; mebranes; pulp waste water treatment

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: JJ84.2 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

Recently, membrane process has been a good separation method and more interesting than other conventional separation processes. In the pulp and paper industry waste water treatment, one of the benefits of using membranes separation proces sis no additives required. In this experiment, flat membranes were synthesized using cellulose acetate as the base polymer, formamide (additive) and acetone (solvent). Those membranes were then characterized and used for treating artificial pulp waste water. The pulp waste water were made by dissoving arrorwot plant fiber into caustic soda solution. Most of the pulp waste content is lignin component and other orhanic compounds. The dissolved arrowroot fiber in caustic soda solution gives the pulp waste intiial condition as follows : pH = 7, 4; COD = 2567 ppm. The membranes from cellulose acetate were synthesized by phase inversion technique (loeb and sorirajan) to get the porous and asymmetric membranes desired. Scanning electron microscopy shows that the membranes porous are categorized ultrafiltration membranes. The cellulose acetate membranes with a surface area of 2462 cm2, membranes thickness 0,12 mm were tested to separate lignin from pulp waste by using dead end system. The concentration of lignin, both in the feed and permeate, were determined by using UV - VIS spectophotometer at 297 nm. The experiment was conducted at various compositions i. e. 15 % - 19 % cellulose acetate, 32 % - 44 % formamide, and 41 % - 50 % acetone. The applied operating pressure various at 1.5 bar - 2.5 bar. The ultrafiltration operates at 29 celcius degree. The feed contained 261 - 277 ppm of dissolvd lignin and the permeate contained 26 - 27 ppm. The performance ofa given membrane is determined by two parameters, i. e. the rejection coefficient and flux. The results of this experiment showed that the optimum membrane composition contains 17 g (37,5, %) of cellulose acetate, 39 g (37,5 %) of formamide and 48 g (46,15 %) of acetone. At the optimum operating pressure of 2.5 bar, the rejection coefficient of the membrane is 90%, the permeat flux is 17,67 liter . m(-2). hour(-1) and COD reduction of 90 %. The ultrafiltration membranes have a cut - off about 90.000 g / mol. Membrane processes combined with aeration method that is operated for more than 8 hours can reduce COD content in permeate < 50 ppm.

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