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Basic data for wastewater treatment plants design

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Input data

Contributing population

Length of the sewage collection network

Per capita water consumption

Peak contribution day coefficient

Peak contribution hour coefficient

Wastewater/water flow relationship

Minimum flow contribution coefficient

Per capita BOD contribution - see note 1

Per capita COD contribution - see note 2

Rainwater contribution in wastewater network, in L/(s.m)

Output data

Maximum wastewater incoming flow

Average wastewater incoming flow

Minimum wastewater incoming flow

Average incoming BOD

Average incoming COD

Description

Given the population, per capita contribution, peak contribution coefficients, per capita BOD and COD, network extension and rainwater contribution; calculates incoming flows and average BOD and COD.

Diagram of wastewater treatment plantDiagram of wastewater treatment plant

Notes:

  1. Per capita BOD varies from 45 to 60 g/(hab.day). 54 g/(hab/day) is usually adopted (VON SPERLING, M, 2005).
  2. COD/BOD relationship indicates the sewage biodegradability. In raw domestic sewage, COD/BOD relationship varies from 1,7 to 2,4 (Rede Nacional de Capacitação e Extensão Tecnológica em Saneamento Ambiental - ReCESA.,2008).

References

  • VON SPERLING, M. Princípios do tratamento biológico de águas residuárias. Vol. 1. Introdução à qualidade das águas e ao tratamento de esgotos. Departamento de Engenharia Sanitária e Ambiental - UFMG. 3a ed, 2005. 452 p.
  • Rede Nacional de Capacitação e Extensão Tecnológica em Saneamento Ambiental - ReCESA. Processos de tratamento de esgotos : guia do profissional em treinamento : nível 2 / Ministério das Cidades. Secretaria Nacional de Saneamento Ambiental (org.). – Brasília : Ministério das Cidades, 2008. 118 p