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Nitrification Srt

Calculates required solids retention time for nitrification using temperature-corrected nitrifier growth with ammonia and dissolved oxygen limitation factors. The template reports growth factors, net growth rate, and the design SRT implied by a selected safety factor.

inputs

9 fields

context

2 archetypes

engine

with-tool

outputs

5 scored fields

contract fields

Parameter Map

9 inputs to 5 scored outputs

  • max_specific_growth_d

    float

    Maximum specific nitrifier growth rate at 20 C

    0.1 to 21/d

  • theta

    float

    Temperature correction coefficient

    1.01 to 1.15

  • wastewater_temperature_c

    float

    Wastewater temperature

    5 to 35deg C

  • ammonia_n_mg_l

    float

    Ammonia nitrogen concentration

    0.1 to 80mg/L

  • half_saturation_n_mg_l

    float

    Ammonia half-saturation coefficient

    0.05 to 5mg/L

  • dissolved_oxygen_mg_l

    float

    Dissolved oxygen concentration

    0.1 to 8mg/L

  • oxygen_half_saturation_mg_l

    float

    Oxygen half-saturation coefficient

    0.05 to 2mg/L

  • decay_rate_d

    float

    Nitrifier decay rate

    0 to 0.21/d

  • safety_factor

    float

    SRT safety factor

    1 to 4
temperature_corrected_growth_dtol 0.03

Temperature-corrected maximum growth rate

substrate_factortol 0.03

Ammonia substrate limitation factor

oxygen_factortol 0.03

Dissolved oxygen limitation factor

net_growth_dtol 0.03

Net nitrifier growth rate

required_srt_daystol 0.03

Required solids retention time

visibility contract

Difficulty Ladder

all_giveneasy

All parameters given for a municipal plant

all fields visible
all_givenmedium

All parameters given across nitrification checks

all fields visible
all_givenhard

All parameters given for cool-weather nitrification

all fields visible

scenario bands

Archetype Atlas

municipal_plant

2 contexts

Municipal wastewater nitrification SRT check

max_specific_growth_d0.6 to 1.2
theta1.05 to 1.1
wastewater_temperature_c12 to 25
ammonia_n_mg_l2 to 40

municipal-activated-sludge / secondary-treatment

cool_weather_upgrade

2 contexts

Cool-weather nitrification upgrade check

max_specific_growth_d0.8 to 1.4
theta1.06 to 1.12
wastewater_temperature_c8 to 16
ammonia_n_mg_l5 to 50

winter-nitrification / plant-upgrade

rendered task

Generation Preview

winter-nitrification-cool-weather-upgrade-preview

difficulty
hard
visibility
all_given
archetype
cool_weather_upgrade
site context
winter-nitrification
instruction excerptnitrification-srt_calc.py

visible fields

  • max_specific_growth_d0.8 to 1.4 1/d
  • theta1.06 to 1.12
  • wastewater_temperature_c8 to 16 deg C
  • ammonia_n_mg_l5 to 50 mg/L
  • half_saturation_n_mg_l0.5 to 1.5 mg/L
  • dissolved_oxygen_mg_l2 to 5 mg/L
  • oxygen_half_saturation_mg_l0.3 to 0.8 mg/L
  • decay_rate_d0.02 to 0.08 1/d
  • safety_factor1.5 to 3

withheld schema

temperature_corrected_growth_dsubstrate_factoroxygen_factornet_growth_drequired_srt_days
Cool-weather nitrification upgrade check. winter-nitrification. Required outputs: temperature_corrected_growth_d, substrate_factor, oxygen_factor, net_growth_d, required_srt_days