Shewhart's control charts and process capability ratio applied to a sewage treatment station

Engenharia Agrícola

Fábio Orssatto²  Marcio A. Vilas Boas¹  Ricardo Nagamine¹  Miguel A. Uribe-opazo¹ 

[1] ,UTFPR Núcleo de Ciências Biológicas e Ambientais Medianeira PR

关键词: STS;    Sewage;    Process Capability;    Shewhart Control Chart;    ETE;    Esgoto doméstico;    capacidade do processo;    cartas de controle;   

DOI  :  10.1590/S0100-69162014000400016

来源: SciELO

【 摘 要 】

The current study used statistical methods of quality control to evaluate the performance of a sewage treatment station. The concerned station is located in Cascavel city, Paraná State. The evaluated parameters were hydrogenionic potential, settleable solids, total suspended solids, chemical oxygen demand and biochemical oxygen demand in five days. Statistical analysis was performed through Shewhart control charts and process capability ratio. According to Shewhart charts, only the BOD(5.20) variable was under statistical control. Through capability ratios, we observed that except for pH the sewage treatment station is not capable to produce effluents under characteristics that fulfill specifications or standard launching required by environmental legislation.

【 授权许可】

CC BY   
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