An Empirical Model for Build-up of Sodium and Calcium Ions in Smal Scale Reverse Osmosis  

Oleh:

Nasir, Subriyer

Jenis: Article from Journal - ilmiah nasional - terakreditasi DIKTI
Dalam koleksi: Makara Journal of Technology vol. 14 no. 2 (Nov. 2010), page 65-72.
Topik: Build-up; Membrane; Model; Osmosis; Water

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: MM64.4 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

A simple models for predicting build-up of solute on membrane surfrace were formulated in this paper. The experiments were conducted wit secondary effluent, groundwater and simulated feed water in small-scale of RO with capacity of 2000 L/d. Feed water used in the experiments contained varying concentrations of sodium, calcium, combined sodium and calcium. In order to study the effect of sodium and calcium ions on membrane performance, experiments with ground water and secondary effluent wastewater were also performed. Build-up of salts on the membrane surface was calculated by measuring concertrations of sodium and calcium ions in feed water permeate and reject streams using Atomic Absorption Spectrophotometer (AAS). Multiple linear regression of natural logarithmic transformation wasused to develop the model based on four main parameters that affect the build-up of solute in a small scale of RO namely applied pressure, premeate flux , membrane resistance, and feed concentration. Experimental data obtained in a small scale RO unit were used to develop the empirical model. The predicted values of theoretical build-up of sodium and calcium on membrane surface were found in agreement with experimental data. The deviation in the prediction of build-up of sodium an calcium were found to be 1.4 to 10.47% and 1.12 to 4.46%, respectively.

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