Prozeßvergleich von Umkehrosmose und Elektrodialyse am Beispiel der Nitrat-Entfernung aus Grundwässern

Comparison of reverse osmosis and electrodialysis for removal of nitrate from groundwater . Reverse osmosis and electrodialysis are membrane processes suitable for desalination of aqueous solutions. Both processes were tested on a pilot scale in a waterworks for removal of nitrate from groundwater. A combination of the processes was also considered with a view to very high concentration of the residual water. The article shows how information gathered from long-term reverse osmosis trials and the experiments with the electrodialysis plant with industrial membrane dimensions can provide a basis for safe design of large plants. Treatment costs for large capacities are shown for the example of the above feed water. The advantages and disadvantages of reverse osmosis and electrodialysis are compared. This comparison demonstrates fitting applications of the two processes in other areas (chemical industry, sewage treatment).     

Anlagensicherung mit Mitteln der Prozeßleittechnik

Plant Securing by Means of the Process Control Engineering. The Process control engineering contributes in an important way to the environmental protection and to the plant security in the chemical industry. Due to their historical evolution and the different forms of organization the enterprises have different, but equivalent safety conceptions by process control engineering. These different procedures have been synchronized and the results have been formulated in a NAMUR recommendation. The contribution gives an information about the most important results of this work.