Discussion summary

Discussion summary

It was asked whether any attempt had been made to concentrate algal slurry by winddriven centrifuges. This method would be too expensive in Israel. Others wondered about seasonal variations in the toxicological and nutritional characteristics of the algae, and were assured that these could be controlled by causing a single species of known toxicological and nutritional characteristics to become dominant. This may be done by selecting the appropriate conditions of loading and retention times in the ponds.

There was the suggestion that membrane separation might well be feasible at the present time. In reply to a question on the stability and reproducibility of the process, it was stated that the system had worked satisfactorily in both summer and winter over a period of three years.