. Removal of nitrate by an algal system. Water; Nitrates; Water; Algae. compressed air. In addition, five levels of Fe were tested in cultures to which mg/l P had been added and which were swirled twice daily. The nitrate remaining in the var- ious cultures is shown in Figure l6. These data indicate that interaction occurred between the three variables tested, and that in general, the addition of CO2 and Fe increased the rate of nitrate assimilation. The level of iron addition which provided the maximum effect was about 3 mg/l of Fe, The minimum requirement for complete nitrate assimilatio
. Removal of nitrate by an algal system. Water; Nitrates; Water; Algae. compressed air. In addition, five levels of Fe were tested in cultures to which mg/l P had been added and which were swirled twice daily. The nitrate remaining in the var- ious cultures is shown in Figure l6. These data indicate that interaction occurred between the three variables tested, and that in general, the addition of CO2 and Fe increased the rate of nitrate assimilation. The level of iron addition which provided the maximum effect was about 3 mg/l of Fe, The minimum requirement for complete nitrate assimilation at 11 days was 4 percent C02> 2 mg/l P, and 3 mg/l Fe, The addition of higher levels of Fe and P probably resulted in SWIRLED TWICE DAILY COMPRESSED AIR 47o CO2 IN COMPRESSED AIR 2 mg/l PO4-P 4 mg/l PO4-P 8 mg/ I PO4 -P ; LIGHT 12 ON-12 OFF. 3 6 9 12 Fe ADDITION mg/l FIGURE 16-NITRATE-NITROGEN REMAINING AT DAY II IN SCENEDESMUS CULTURES WITH VARIOUS COMBINATIONS OF Fe, P, AND CARBON DIOXIDE the formation of an unavailable iron-phosphate complex. By day 16, all aerated cultures (with and without CO2) receiving the addition of 3 mg/l or more Fe had reached zero nitrate concentration. Carbon dioxide undoubtedly played a dual role in these culture studies by supplying additional inorganic carbon and lowering the pH to such an extent that many elements that ordinarily precipitated in algal cultures re- mained in solution. In most of the laboratory culture work at Firebaugh, 4 percent bottled COg was used; however, on occasion 100 percent C02 was tested. The addition of -kl-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original California. Dept. of Water Resources; Brown, Randall L. Sacramento]; For sale by the Supt. of Docs. , U. S. Govt. Print. Off. , Washington
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Keywords: ., bookcentury1900, booksubje, booksubjectalgae, booksubjectnitrates
