{"title":"Computer-based measurement ofwastewater BOD","authors":"George Hassapis","doi":"10.1016/0921-5956(91)80026-C","DOIUrl":null,"url":null,"abstract":"<div><p>This paper describes the development of a computer-based instrument for the fastmeasurement of the biological oxygen demand (BOD) of wastewater. The conventional measurement method is based on laboratory analysis results that are available after a delay of five days. The BOD is assessed by the instrument described here by monitoring the change in the dilution ratio of fresh water to wastewater that has to be made in order to keep at a constant value the oxygen consumed in a special whirl bed reactor in which microorganisms are grown. Depending on the reactor volume, the algorithm for the computer control of the dilution ratio and the architecture of the computer selected, a measurement time in the range of 2 to 10 minutes can be achieved. The results of practical experience gained from building and testing such a measuring instrument are presented and discussed.</p></div>","PeriodicalId":100666,"journal":{"name":"Industrial Metrology","volume":"2 1","pages":"Pages 71-84"},"PeriodicalIF":0.0000,"publicationDate":"1991-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0921-5956(91)80026-C","citationCount":"1","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Industrial Metrology","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/092159569180026C","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 1
Abstract
This paper describes the development of a computer-based instrument for the fastmeasurement of the biological oxygen demand (BOD) of wastewater. The conventional measurement method is based on laboratory analysis results that are available after a delay of five days. The BOD is assessed by the instrument described here by monitoring the change in the dilution ratio of fresh water to wastewater that has to be made in order to keep at a constant value the oxygen consumed in a special whirl bed reactor in which microorganisms are grown. Depending on the reactor volume, the algorithm for the computer control of the dilution ratio and the architecture of the computer selected, a measurement time in the range of 2 to 10 minutes can be achieved. The results of practical experience gained from building and testing such a measuring instrument are presented and discussed.
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