A Partial Coulometric Method for Determination of Biodegradable Organic Matter in Water

Abstract

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. The present invention finds a unique way to select the fastest point of voltage drop as the cut-off point of voltage collection. The cut-off point is easy to find and can greatly shorten the measurement time and improve the work efficiency. Moreover, the local Coulomb method of the cut-off point selection method is used. Oxygen BOM Q1 The linear correlation between the value and the concentration of GGA standard solution for cultivating electrogenic microorganisms is better, which provides a more scientific, reasonable and accurate test method for the determination of biodegradable organic matter in water by microbial fuel cells, and provides a new method for scientific control of water environmental pollution. The idea and direction of this paper have great promotion value and broad 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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