Ammonia effluent concentration

[CrazyHorse81]

We are designing a new lift station, forcemain, and a 2-cell, 358-day controlled discharging facultative lagoon with the primary depth 6' total (4' working) and the secondary depth 8' total (6'working). Each cell is 8-acres. Located in Nebraska, USA latitude 42-degrees pretty cold winters months and hot summer months. We would discharge in September. We are not aerating the lagoons in the design.

The forcemain is 6" diameter, 8,600 feet long and would take 200 minutes for a slug of wastewater to travel that distance at a 250 gpm pumping rate and cycle time of 23.5 minutes...how would this affect the wastewater strength if it goes anaerobic? I assumed typical concentrations entering the primary lagoon cell as listed: BOD = 200; Total N = 35; NH3 = 15; Total P = 10; Soluble P = 7; TSS = 240 all in mg/l

I was asked to calculate the anticipated effluent ammonia concentration and have had quite the time trying to determine how to trace the nitrification-denitrification process through the lagoon system. The permit allows a monthly average of 2.8 mg/l max from March-October, and 5.5 mg/l daily max.

Any advice on how to approach this would be highly appreciated.

 

[bimr]

The force main should not have any appreciable affect on the operation.

Facultative lagoon systems are simple to operate, but only partially reliable in performance. Removal of ammonia nitrogen can be significant (up to 80 percent), depending on temperature, pH, and detention time in the system. However, the removal cannot be sustained over the winter season.

http://water.epa.gov/scitech/wastetech/upload/2002_10_15_mtb_faclagon.pdf

 

[bimr]

Here is another reference:

http://www.norweco.com/pdf/epa/625R00008tfs7.pdf

http://www.clemson.edu/ces/departments/eees/outreach/AERATEDLAGOONTECHNOLOGY.pdf