Study of Potential Water Efficiency Improvements in Commercial Businesses Fina
Study of Potential Water Efficiency Improvements in Commercial Businesses Fina
United States Environmental Protection Agency
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II, covering fungi, algae, protozoa and viruses (Laskin et at, 1977); "Algal Biomass" (Shelef et al, 1980); "Wastewater for Aquaculture" (Grobbelaar, 1981), there is barely any mention of algal trace mineral content. The micro-nutritional requirements of microalgae in media have been developed by trial and error, using bioassay techniques and generally species differences are limited to "fresh water algae" and "salt water algae" (Stein 1973), but analyses of the resultant algae are apparently l...acking in most cases. An exception is the health food blue-green algae Spirulina which, because it is sold as a human food, has been analyzed for trace minerals including selenium, variously reported to be 6. 2 mg/kg, 5. 5 mg/kg (Switzer, 1982) and 0. 4 mg/kg (Hills, 1980). This Spirulina is washed and spray dried so that absorbed ions are likely removed to some extent. From the above, it is apparent that more studies of the trace mineral content of drainage algae should be done, particularly with respect to the priority pollutants arsenic, cadmium, chromium, copper, lead, mercury, selenium and zinc.
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