基于O<sub>3</sub>/UV法的消解终止自动确定方法

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Abstract

In order to improve the detection accuracy and efficiency for the on-line monitoring device of chemical oxygen demand (COD) by using Ozone in combination with Ultraviolet Radiation (O₃/UV), the relationship between the concentration change rate of the produced carbon dioxide (CO₂) and the digestion rate of organics is analyzed in the digestion of different water samples, a method is further proposed to automatically determine the termination of digestion. Based on the data collected by each sensor during the digestion process, the standard deviation of CO₂ gas concentration change rate is calculated using the moving block standard deviation (MBSD) method, which is applied to automatically determine the termination time of digestion. Digestion experiments with organics of different types and different centration reveal that organics are completely degraded when the standard deviation of CO₂ concentration is less than 0.003, which can be considered as the end point of the reaction. This method can not only improve the detection accuracy and efficiency for the on-line monitoring device of COD, but also has guiding significance to the treatment of wastewater based on O₃/UV method.

Key words： ozone combined with ultraviolet radiation (O₃/UV) chemical oxygen demand (COD) digestion carbon dioxide (CO₂) moving block standard deviation (MBSD)

Received: 10 September 2018

PACS:

X830.3

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	Articles by authors
	MU Rui
	YANG Hui-zhong

Cite this article:

MU Rui,YANG Hui-zhong. An automatic determination method of digestion termination based on O₃/UV method[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(6): 2431-2436.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I6/2431

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