The Dead Sea

Our Dutch engineer, who visited New Orleans, has a name: Roland Winter. Roland got his engineering degree from Delft University in Holland. Delft University is very well known and respected in Europe and really all over the world. It is an engineering school with numerous venues of study. Water management is probably one of the most prominent areas, and that is what Roland did. His study had to do with dike construction. After his studies, he worked with the Delta werken team for a year or so. The Delta Works (in English) project jumped out after the 1953 flood in South-Western Holland. The ideas were not new, but that flood sped up the process. Basically, instead of strengthening every dike around each island of the provinces Zeeland and Zuid Holland, the islands were connected with dams on the ocean side, and the water behind those dams, controlled.

Then Roland joined an engineering company, which dealt with dike and dam construction. He was involved in various projects but a big project on the Dead Sea in Israel became his long-term responsibility. The Dead Sea has a very high salt concentration, but also is rich in potassium, which is used primarily in fertilizers. To win salt, was not economical. That is more economical in places like the San Fransisco Bay, where you can see the salt beckons from the air, as the plane approaches San Fransisco airport.

"A process is proposed for the recovery of potassium from brines by precipitation as potassium perchlorate, followed by conversion to potassium chloride by liquid anion exchange with a tertiary amine in the form of its hydrochloride. Regeneration of the amine salt is effected by means of lime and hydrochloric acid. The process was tested on Dead Sea brine, containing 13 g/l KCl. Precipitation at 30 °C gave a 40% yield of potassium, cooling to 0 °C increased the yield to over 80%. The anion exchanger used was the hydrochloride of trioctylamine dissolved in toluene; this performed satisfactorily and phase separation was easy. A separation factor of 130 was obtained for the ClO4/Cl separation. Regeneration of the amine was tested with various bases."  (The recovery of potassium chloride from Dead Sea brines by precipitation and solvent extraction   J.A Epstein,  D Altaras, E.M Feist, J Rosenzweig   Copyright © 1975 Published by Elsevier B.V.)

In Israel, the salt beckons are just that, but the process of extracting potassium is attractive. So, what to do with the salt? It is just left after the water, that is pumped into the beckons, evaporates. This means that the dikes around the beckons need to be raised every 7-8 years, and that was Roland’s job to design how much higher they should become. Also, because the Dead Sea level is lowering, the water got further and further away from the pumps, so they had to be relocated closer to the water. That also was Roland’s responsibility to figure out for the contractors. Every 4-5 years Roland would go down to Israel for a month or so to evaluate the situation, take the measurements, then redesign the new dike elevation. He did this for his whole career, besides smaller projects in between.