Abstract
Cross-flow microfiltration using ceramic tubular membrane was applied for treatment of steepwater from corn starch industry. Experiments are conducted according to the faced centered central composite design at three different transmembrane pressures (1, 2 and 3 bar) and cross-flow velocities (100, 150 and 200 L/h) with and without the usage of Kenics static mixer. For examination of the influence of the selected operating conditions at which usage of the static mixer is justified, a response surface methodology and desirability function approach were used. Obtained results showed improvement in the average permeate flux by using Kenics static mixer for 211 % to 269 % depending on experimental conditions when compared to the system without the static mixer. As a result of optimization, the best results considering flux improvement as well as reduction of specific energy consumption were obtained at low transmembrane pressure and lower feed cross-flow rates.
Highlights
For years industries are familiar with the water recirculation concept which has been used in many factories
Compact filter cake occurs at higher transmembrane pressure and leads to flux reduction which is a negative effect of higher transmembrane pressure [22, 23]
4 Conclusions Improvement in microfiltration process of steepwater from corn starch industry with embedded Kenics static mixer was achieved at lower cross-flow rates and transmembrane pressures
Summary
Industries are familiar with the water recirculation concept which has been used in many factories. In order to accomplish this aim, many techniques for wastewater treatment have been applied and usage of membrane separation processes is becoming the most common solution. As proposed in the Best Available Techniques-BAT (issued by the Commission of the European Union) [2], membrane separation processes more often become applied in wastewater treatment from many industries especially because of the requirement for higher water quality. Membrane fouling represents an inevitable problem, but it could be adjusted to a reasonable extent using different techniques [5], and one is fluid instability produced by turbulence promoters. The advantage over dynamic promoters is given to static ones because of simple shape and installation, usage in a wide flow and viscosity ranges, resistance to depletion and lower operational
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