Problems of contamination

Simple production is not the main problem in algal technology. The shallow, open-air ponds are vulnerable to contamination. Not only are methods required to maintain conditions favouring the chosen algal species to the exclusion of other organisms, but also monitoring programmes must be developed to insure a non-toxic, hygienically safe algal product. Serious problems of contamination have not been encountered, although occasional infestation of the culture with Brachionus and Chironomus larvae were observed during certain seasons. In waste stabilization ponds, contamination with other algae was frequently seen, but this could be overcome by a gradual population build-up of the desired organism.