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NSF International <br /> Standard 40 - Individual Wastewater Treatment Plants <br /> Stress Test Evaluation <br /> Week Beginning: March 14, 1993 _ Plant Code: 108 <br /> Weeks Into Test. 21 <br /> Sunday Monday Tuesday Wednesday Thursday Friday Saturday <br /> Dosed Volume (gallons) 450 388 450 450 450 450 450 <br /> Dissolved aeration 1.0 1.6 1.7 1.8 1.5 1.2 <br /> Oxygen chamber <br /> (m9/L) effluent (2) 4.7 4.8 4.5 4.8 4.7 <br /> influent 11 11 12 11 11 11 <br /> Temperature aeration 14 13 13 13 13 14 <br /> (°C) chamber <br /> effluent (2) 7 7 4 3 4 <br /> influent 7.4 7.5 7.5 7.6 7.5 7.6 <br /> pH aeration 7.6 7.5 7.6 7.6 7.4 7.5 <br /> chamber <br /> effluent 7.7 7.7 7.7 7.7 7.7 7.8 7.7� <br /> Biochemical influent 160 140 180 150 180 160 160 <br /> Oxygen Demand <br /> (mg/L) effluent 20 <5 6 <5 <5 <5 <5 <br /> influent 170 130 180 170 190 180 220 <br /> Suspended <br /> Solids aeration g 25 10 <5 7 <5 <br /> (m,91L) chamber <br /> effluent 27 6 12 5 <5 <5 <5 <br /> influent 140 120 160 140 160 150 200 <br /> Volatile <br /> Suspended aeration <5 17 7 <5 <5 <5 <br /> Solids chamber <br /> (m9/L) effluent 17 <5 8 <5 <5 <5 <5 <br /> 45 Minute <br /> Settleable aeration <5 <5 <5 <5 <5 <5 <br /> Solids chamber <br /> (mUL) <br /> (1) Site problem Notes: Frozen diverter valve on 3/15 resulted in low doses and no <br /> (2) Malfunction of system under test effluent DO or temperature readings. <br /> (3) Weather problem <br /> (4)Other <br /> TGS/3-92 <br /> C-21 <br />