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Orenco Systems Inc. March 2002 <br /> AdvanTex AX10 Test Report <br /> 4. DISCUSSION <br /> 4.1 CBOD Removal Efficiency <br /> The?-day average CBOD5 removal efficiency ranged between 85 and 90% during the first <br /> 11 weeks of testing (Figure 9). It declined thereafter, and for the next 18 weeks it ranged <br /> between 65 and 80%. CBOD5 removal efficiency recovered on Week 30 and ranged <br /> between 85 and 95% for the balance of the test. <br /> Figure 9: CBOD Removal Efficiency— 7 Day Averages <br /> t. tan --- _ - — <br /> F equency OSing Flow POduced to 400 gptl <br /> Increaeetl + 5 S 5 <br /> S <br /> ` 90 S Manlloed S <br /> S Replac tl <br /> Pipe <br /> Rsplacetl <br /> n0 <br /> � 5 <br /> 5 <br /> ye 70 <br /> 6r <br /> 60 <br /> r <br /> 50 <br /> 0 5 10 15 20 25 30 35 40 45 50 55 <br /> 7 Day Perled <br /> The decline in CBOD5 removal efficiency occurred during a period of rising liquid <br /> temperature (Figure 2) and reduced CBOD5 loading (until Week 22 - Figure 10). <br /> Figure 10: Influent CBOD Load — 7 Day Averages <br /> L MaNIOItl Dosing <br /> 500 Replacetl Frequency <br /> Pipe <br /> S=stress test Replacetl <br /> Flow <br /> 400 <br /> em 500 gptl <br /> S to 400 gptl <br /> QM3 300 <br /> 200 S <br /> S S g <br /> � S <br /> 100 <br /> � 0 <br /> 0 5 10 15 20 25 30 35 40 45 50 55 <br /> 7 Dir Per1p4 <br /> NovaTec Consultants Inc. Page 21 of 38 <br />