Fractional Factorial Design Application for the Determination of Parameters Affecting KOH and HCl Generation from Simulated Wastewater Solution by Bipolar Membrane Electrodialysis

Abstract

The aim of the study is to determine the significant factors influencing the generation of potassium hydroxide and hydrochloric acid from simulated potassium chloride solution by bipolar membrane electrodialysis using fractional factorial design. The membrane stack with acid, dilute (salt), and base compartments was used in the experiments. Fractional factorial design 24-1 was employed to evaluate the parameters affecting the production of base and acid. The process has been investigated as a function of four main factors namely, initial concentrations of acid and base, initial salt concentration, current density, and electrolyte concentration. Normal probability plot and Pareto charts revealed that the initial salt concentration is the most significant parameter affecting the bipolar membrane electrodialysis system performance. The results were also statistically analyzed by using the main effects plots and the ANOVA method. The significance of initial salt concentration was confirmed by both statistical findings.

Keywords

• Bipolar membrane
• Electrodialysis
• Fractional factorial design

Bipolar Membran Elektrodiyaliziyle Simüle Atıksu Çözeltisinden KOH ve HCl Üretimini Etkileyen Parametrelerin Belirlenmesi İçin Kesirli Faktöriyel Tasarım Uygulaması

Öz

Bu çalışmanın amacı, kesirli faktöriyel tasarımını kullanarak bipolar membran elektrodiyaliz ile bir simüle atık çözelti olarak hazırlanan potasyum klorür çözeltisinden potasyum hidroksit ve hidroklorik asit üretimini etkileyen önemli faktörleri belirlemektir. Deneylerde kullanılan membran hücresi asit, tuz ve baz bölmelerinden oluşmaktadır. Asit ve baz üretimini etkileyen parametreleri değerlendirmek için kesirli faktöriyel 24-1 tasarımı kullanılmıştır. Proses dört ana faktörün fonksiyonu olarak incelenmiştir. Bu faktörler, başlangıç asit ve baz konsantrasyonları, başlangıç tuz konsantrasyonu, akım yoğunluğu ve elektrolit konsantrasyonudur. Normal olasılık grafiği ve Pareto diyagramı, başlangıç tuz konsantrasyonunun bipolar membran elektrodiyaliz sistemini etkileyen en önemli parametre olduğunu ortaya koydu. Sonuçlar ayrıca ana etki grafikleri ve ANOVA yöntemi kullanılarak istatistiksel olarak analiz edildi. Başlangıç tuz konsantrasyonunun en etkin parametre olduğu her iki istatiksel bulguyla da doğrulandı.

Anahtar Kelimeler

• Bipolar membran
• Elektrodiyaliz
• Kesirli faktöriyel tasarım

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