Rapid, simple, and accurate method for measurement of VFA and carbonate alkalinity in anaerobic reactors

Ori Lahav; Barak E. Morgan; Richard E. Loewenthal

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Rapid, simple, and accurate method for measurement of VFA and carbonate alkalinity in anaerobic reactors

机译：Rapid, simple, and accurate method for measurement of VFA and carbonate alkalinity in anaerobic reactors

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This paper presents a new simple, rapid, and accurate method suitable for on-site measurement of volatile fatty acids (VFA) and carbonate alkalinity in anaerobic reactors. This titrimetric method involves eight pH observations, and typically, the full procedure takes approximately 15 mm. An important feature of the method is a built-in quality control mechanism allowing the user a rapid means of assessing the reliability of the experimental procedure. To evaluate the accuracy of the method, both laboratory-made waters and industrial UASB effluent were tested. High accuracy for both VFA and carbonate alkalinity measurements (error within 2 and 1, respectively) plus good repetition (average standard deviation of 6.7 and 1.45, respectively) was obtained. The method takes into account the effects of the phosphate, ammonium, and sulfide weak acid subsystems. Appraisal of the effect of an input error in these subsystems revealed that VFA measurement is fairly insensitive to phosphate and ammonium concentrations. It is, however, sensitive to H{sub}2S loss during titration where the sulfide concentration is higher than approximately 100 mg/L as S. With regard to the carbonate alkalinity measurement, error in concentration of either phosphate or sulfide or H{sub}2S loss might result in a significant error. Short guidelines for correct execution of the method are given in an appendix.

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《Environmental Science & Technology: ES&T》 |2002年第12期|2736-2741|共6页
作者
Ori Lahav; Barak E. Morgan; Richard E. Loewenthal;
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作者单位

Department of Applied Physics and Advanced Technologies (FATA), National Autonomous University of Mexico, A.P. 1-1010, Queretaro, Qro. 67000, Mexico;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类环境化学;
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Rapid, simple, and accurate method for measurement of VFA and carbonate alkalinity in anaerobic reactors

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