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Effect of ammonium/FA and nitrite/FNA levels on thermophilic ammonia (a, c) and nitrite (b, d) oxidation. Each panel represents two complementary batch activity experiments (filled and empty circles) with full lines depicting the remaining activity, whereas the dotted lines display the corresponding FA/FNA levels per test. Data points represent the average replicate tests (n=6), and error bars represent the s.e.
