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Orenco Systems Inc. March 2002 <br /> AdvanTex AX10 Test Report <br /> LFigure 2: Effluent Temperature — 30 Day Averages <br /> 25 <br /> 9 <br /> 28 <br /> L <br /> 15 <br /> 9 <br /> 10 <br /> 5 <br /> 0 <br /> 1 2 3 d 5 6 7 e 9 1n 11 12 13 <br /> 38 Day Period <br /> 3.1.3 pH <br /> The effluent pH remained rather constant at around 7 during the first 120 days or so, and <br /> then dropped to 6.5 -6.7 (Figure 3). This drop in pH coincided with effluent temperatures <br /> rising above 10DC, and suggests the establishment of nitrification. <br /> L <br /> Figure 3: Effluent pH — 30 Day Averages <br /> L 2 _ <br /> L Be <br /> a <br /> E 64 <br /> L � <br /> 60 <br /> 56 <br /> V 1 2 3 4 5 6 7 8 9 10 11 12 13 <br /> 30 Day Period <br /> The pH drop to around 6.2 during the last month of testing was shown to be associated <br /> with virtually complete nitrification (the ammonia concentration in the treated effluent was <br /> I <br /> L <br /> NovaTec Consultants Inc. Page 16 of 38 <br /> L <br />