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m01- encar Although activated carbon media is included to adsorb and mitigate odors in AdvanTex passive ventilation systems,slight odors may occur during dosing events. Passively ventilated systems should be located in areas where this will not be perceived as a nuisance. Anti-Buoyancy Features AdvanTex AX20 pods come standard with anti-flotation flanges to help prevent the pod from floating out of the ground under saturated soil conditions.Always keep the top of the pod at least 6 inches (150 mm) above grade at all times.When buried to this level, pod spacing is 5 feet(1.5 m) between AX20 units. Contact Orenco for details. AdvanTex AM 00 Pods are designed for installation in areas that are free of water.AM 00 pods can be bermed and free draining, but the bottom of each pod should be no more than 9 inches (230 mm) below the natural grade to protect it from floating in saturated conditions. AX-Max units should be ordered with anti-buoyancy provisions if the unit will be partially buried.Spacing of the units varies, but at maxi- mum bury of 6 feet(1.82 m)with high groundwater conditions,this spacing would be approximately 10 feet(3.04 m) between units.When the unit is set at natural grade and the material used for berming is free flowing, anti-buoyancy will not be necessary. Contact Orenco for details. 1.0 pH Effect on Nitrification 0.9 0.95 ,,00 o.ss_____________ cc 0.s ----------- pH is extremely important for nitrification. (See Figure 7.)The o 07 ------ effective reaction rate (RN) is 0.95 at a pH of 8±, dropping to cc 0.6 ----------------------------------------•---- -------------'----------------------------- --------------------------- 0.47 at a pH of 7, and dropping precipitously to 0.15 at a pH of 0.5 --------------0A71 -- 6. Nitrification effectively ceases at a pH of 5.The use of addi- 'z 0.4 ------------------------------------ -4--------------------4--------------------4------------------ 4�=37-------------- tional alkalinity to buffer the process is critical for all nitrogen 0.3 --------------------i---------- -------i--------------------i--------------------i--------------------t-------------------- °' 0.2 --------------0.151--- - ------------------------------------ removal configurations and the feed system should be sized to W 0.1 ------------- --- '• '•--------------------'•---------------------------------------- provide a minimum targeted residual of 80 mg/L,with a pre- a o 0.02 1______________ _1 ferrel residual target of 100 mg/L. 5 6 7 8 9 10 11 pH Cold Weather Considerations Figure 7. pH Effects on Nitrification The naturally occurring bacteria that populate the AdvanTex treatment media are active at temperatures above 440 F(6.70 4.0 C),with an optimal temperature range above 68°F(20°Q.To 3.5 ---------- --------- atai°rTypical ensure treatment in cold climates or areas with seasonal cold Y 3.0 ------------ +----------4-----------tB;o,oglip-------------------------------------+------- - ---------- weather, it is recommended that the liquid temperature remain o 25 _ _____________!Shutdopun itrifier� Above r -- ---------------------- ca above 500 F(100 Q.Temperature is especially important in the 20 ,OccursActty ---- -------- - nitrification and denitrification process. If temperature values are ! ;Drops y ---------- ---------- ---------- --------- expected to be below this threshold,contact Orenco for heating W o _______ 1 1 r �..1• 1 ---------+ ------ "' -p options and/or safety factors for design purposes. •_ +...... 1 enitrif,rs 0.5 Temperature Effect on Nitrification and Denitrification C o 50 60 Temperatures in the liquid stream and treatment media have o ,o zo 3o ao Temperature,OF 70 so so ,00 „o an impact on both the nitrification and denitrification processes. The effect of temperature on nitrification and denitrification Figure 8.Temperature Effect on Nitrification and Denitrification rates can be used to predict efficiency of the overall treatment process, as shown in Figure 8. Orenco bases performance on minimum temperature values of 50°F(100 C) during winter operation and 59°F (15°C) during summer operation. For actual liquid temperatures below these values, systems should be upsized to achieve treatment expectations described in this document. Following are cold weather considerations for AX20 pods,AM 00 pods, and AX-Max units,as well as general cold weather considerations for all systems to prevent freezing and avoid damage due to frost heave: Orenco Systems°•800-348-9843•+1 541-459-4449•www.orenco.com NDA-ATX-1 Rev.8,©10/20 Page 19 of 38