. Removal of nitrate by an algal system. Water; Nitrates; Water; Algae. apparently no signifi- cant change occurred in the percentage of volatile material in the effluent solids (Figure 4l). The mixing system finally selected for general use in the outdoor growth units caused obvious diurnal fluctuations in the effluent volatile solids. A typical diurnal cycle is illus- trated in Figure 42. In this particular in- stance, the 0830 vola- tile solids (normal sampling time) of 374 mg/1 indicated an unrealistically high value for the amount of biomass produced by the system. Graphical in- tegration
. Removal of nitrate by an algal system. Water; Nitrates; Water; Algae. apparently no signifi- cant change occurred in the percentage of volatile material in the effluent solids (Figure 4l). The mixing system finally selected for general use in the outdoor growth units caused obvious diurnal fluctuations in the effluent volatile solids. A typical diurnal cycle is illus- trated in Figure 42. In this particular in- stance, the 0830 vola- tile solids (normal sampling time) of 374 mg/1 indicated an unrealistically high value for the amount of biomass produced by the system. Graphical in- tegration of this curve indicated that the aver- age volatile solids concentration for the 24-hour period was ap- proximately 120 mg/1. Because of the diurnal fluctuation caused by algal settling, the total pond biomass increased Indicating that it was accumulating at a rate faster than that at which it was being removed. Volatile solids concen- trations of more than 500 mg/1 often were noted in the growth units and the solids seldom reached steady-state conditions. Actual biomass production during a 19- day period of August- September 1969 was calcu- lated for a minipond in aoi 60- I I 0 5 10 PER CENT CARBON DIOXIDE ADDED FIGURE 41-AVERAGE AND RANGE- PER CENT VOLATILE SOLIDS OF TOTAL SUSPENDED SOLIDS AT DIFFERENT LEVELS OF COg ADDITION -MrXING PERIODS § 100-. SAMPLING TIME FIGURE 42-DIURNAL FLUCTUATIONS IN EFFLUENT VOLATILE SOLIDS -71-. 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
