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Srt Calculation

Calculates solids retention time for an activated sludge process from aeration basin solids inventory and daily solids losses through waste activated sludge and effluent TSS. The template reports system solids, wasted solids, effluent solids loss, total loss, and SRT.

inputs

6 fields

context

2 archetypes

engine

with-tool

outputs

5 scored fields

contract fields

Parameter Map

6 inputs to 5 scored outputs

  • aeration_volume_m3

    float

    Aeration tank volume

    10 to 200000m3

  • mlss_concentration_mg_l

    float

    Mixed liquor suspended solids concentration

    500 to 8000mg/L

  • was_flow_m3_d

    float

    Waste activated sludge flow rate

    1 to 50000m3/d

  • was_tss_mg_l

    float

    Waste activated sludge TSS concentration

    1000 to 20000mg/L

  • effluent_tss_mg_l

    float

    Effluent TSS concentration

    0 to 100mg/L

  • effluent_flow_m3_d

    float

    Effluent flow rate

    1 to 1000000m3/d
solids_in_system_kgtol 0.03

Mass of solids in aeration system

solids_wasted_kg_dtol 0.03

Mass of solids wasted per day

effluent_solids_loss_kg_dtol 0.03

Mass of solids lost in effluent per day

total_solids_loss_kg_dtol 0.03

Total daily solids loss

srt_daystol 0.03

Solids retention time

visibility contract

Difficulty Ladder

all_giveneasy

All parameters given for a package activated sludge plant

all fields visible
all_givenmedium

All parameters given across package and municipal activated sludge systems

all fields visible
all_givenhard

All parameters given for municipal activated sludge SRT checks

all fields visible

scenario bands

Archetype Atlas

package_activated_sludge

2 contexts

Package activated sludge plant

aeration_volume_m3100 to 2000
mlss_concentration_mg_l2500 to 5000
was_flow_m3_d5 to 300
was_tss_mg_l6000 to 15000

remote-community-wwtp / industrial-package-wwtp

municipal_activated_sludge

2 contexts

Municipal activated sludge process

aeration_volume_m32000 to 100000
mlss_concentration_mg_l2000 to 4500
was_flow_m3_d100 to 10000
was_tss_mg_l5000 to 12000

regional-wwtp / urban-nutrient-removal-plant

rendered task

Generation Preview

regional-wwtp-municipal-activated-sludge-preview

difficulty
hard
visibility
all_given
archetype
municipal_activated_sludge
site context
regional-wwtp
instruction excerptsrt-calculation_calc.py

visible fields

  • aeration_volume_m32000 to 100000 m3
  • mlss_concentration_mg_l2000 to 4500 mg/L
  • was_flow_m3_d100 to 10000 m3/d
  • was_tss_mg_l5000 to 12000 mg/L
  • effluent_tss_mg_l3 to 20 mg/L
  • effluent_flow_m3_d5000 to 500000 m3/d

withheld schema

solids_in_system_kgsolids_wasted_kg_deffluent_solids_loss_kg_dtotal_solids_loss_kg_dsrt_days
Municipal activated sludge process. regional-wwtp. Required outputs: solids_in_system_kg, solids_wasted_kg_d, effluent_solids_loss_kg_d, total_solids_loss_kg_d, srt_days