Process Design Procedure for Soil Aquifer Treatment

Step Description

1 Characterize the soil and groundwater conditions with field measurements of lateral and vertical permeability.

2 Predict the hydraulic pathway of the percolate.

3 Select the infiltration rate from the field data.

4 Determine the overall treatment requirements.

5 Select the appropriate level of preapplication treatment.

6 Calculate the annual hydraulic loading rate.

7 Calculate the field (basin) area.

8 Check for groundwater mounding.

9 Select the final hydraulic loading cycle.

10 Determine the number of basins.

11 Determine the monitoring requirements.

1. Calculate the mass of ammonia that can be adsorbed by the soil cation exchange capacity.

2. Calculate the length of the application period that can be used without exceeding the mass of ammonia that can be adsorbed.

3. Compare the nitrogen loading rate to the 50 to 60 lb/ac-d (56 to 67 kg/ha-d) limit for nitrification.

4. Balance the ammonia adsorption with the available oxygen to establish the application and drying periods for nitrification.

5. Balance the nitrate nitrogen produced by nitrification against the applied BOD to ensure an adequate BOD-to-nitrogen ratio. Revise the application/drying cycle if necessary.

6. If necessary, consider reducing the soil infiltration rate to increase the detention time for higher nitrogen removal. Reduction of infiltration can be accomplished by incorporating silt or finer textured topsoil, reduction of the depth of flooding, or compaction of the soil.

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