Local coulomb method for measuring biochemically degradable organic matters in water body

Abstract

The invention belongs to the technical field of water environment chemical analysis, and particularly relates to a local coulomb method for measuring biochemically degradable organic matters in a water body. According to the method, uniquely a fastest voltage reduction point is selected as a cut-off point for collecting a voltage; the cut-off point is easy to find, and the measurement time can begreatly shortened, so that the operation efficiency is improved; by means of the local coulomb method of the cut-off point selection method, the linear correlation between the value of oxygen consumption BOMQ1 in a measurement result and the concentration of a GGA standard solution for culture of electricigens is better, the more scientific, reasonable and accurate test method is provided for measuring the biochemically degradable organic matters in the water body by utilizing a microbial fuel cell, and new idea and direction are provided for scientific control of water environment pollution;and the method has great popularization values and wide application prospects.

Description

technical field [0001] The invention belongs to the technical field of water environment chemical analysis, and in particular relates to a local coulometric method for measuring biochemically degradable organic matter in water bodies. Background technique [0002] Biochemical oxygen demand (BOD) is a comprehensive index that reflects the content of biodegradable organic matter in water or sewage, and is used to characterize the pollution status of water bodies. Ensuring safe and reliable drinking water and effective wastewater treatment is critical to improving livelihoods, economic growth, and reducing health risks and environmental vulnerabilities. The current method for assessing the content of biodegradable organic matter (BOM) in water mainly adopts the five-day biochemical oxygen demand method (BOD 5 ), this method has a long detection cycle, large detection errors, and high requirements for operators. [0003] In recent years, microbial fuel cell (MFC) detection tec...

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Problems solved by technology

[0006] (1) In the maximum current (voltage) method, when the MFC sensor is in the external resistance control mode, Ohm's law is used for conversion, and the maximum voltage output can also be used as an analysis signal. Under low BOM concentration, the current output and BOM concentration have a similar Linear relationship, but when the BOM concentration is high, the current output becomes saturated, and the measurement fails. In addition, only the maximum voltage is used as the analytical signal and is more susceptible to interference

[0007] (2) In the coulomb method, the coulomb quantity (CY) is related to the amount of BOM and the coulomb efficiency (CE). When the BOM concentration changes, it is difficult to maintain a constant CE, because the electrogenic microorganisms and non-anode biofilms in the anode biofilm The dynamic competition between electrogenic microorganisms (such as fermenters and methanogens) affects CE, and the presence of non-electrogenic microorganisms leads to a decrease in CE, thereby reducing CY values

[0008] (3) In the open-circuit method, although the maximum open-circuit voltage (OCV) can also be used as an analytical signal, the correlation between BOM and OCV is still uncertain, and the MFC sensor cannot work in the open-circuit mode for a long time, otherwise the anode microorganisms will lose their activity , these two factors make the applicability of OCV in BOM detection questionable

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