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Method for prewarning nitrate in water

A nitrate and water technology, applied in the direction of electrochemical variables of materials, etc., can solve the problems of small decline, difficulty in warning nitrate, and no practical application, and achieve the effect of high stability

Active Publication Date: 2018-06-22
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although nitrate is neither electron donor nor directly toxic to bacteria, Bingchuan (Liu, B.; Lei, Y.; Li, B., A batch-mode cubemicrobial fuel cell based “shock” biosensor for wastewater The single-chamber MFC constructed by qualitymonitoring.Biosensors and Bioelectronics 2014,62,308-314) can warn the impact of nitrate concentration in situ: when a certain amount of nitrate appears in the influent, the external circuit voltage drops
The author analyzed that the cause of the drop in the voltage of the external circuit was that the nitrate consumed the electrons that should have been transferred to the cathode through the external circuit at the anode, but the degree of drop was very small (the voltage drop ratio was less than 5%), and the sensitivity was low, so it was not necessary Possibility of practical application
In particular, when the concentration of organic matter and nitrate nitrogen in the influent both increase, there will be great difficulties in early warning of nitrate

Method used

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  • Method for prewarning nitrate in water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] (1) Microbial electrochemical sensors based on open circuit operation

[0048] The microbial electrochemical sensor based on open circuit operation provided by this embodiment is a dual-chamber microbial electrochemical sensor, and its structure is as follows: figure 1 shown.

[0049] Described microbial electrochemical sensor comprises anode chamber 11 and cathode chamber 12 and is positioned at the proton exchange membrane 3 between anode chamber 11 and cathode chamber 12; Described anode chamber (7mL) is provided with anode electrode 1, and described anode electrode is A carbon felt with a diameter of 3 cm and a thickness of 0.6 cm; a cathode electrode 2 is arranged in the cathode chamber (28 mL), and the cathode electrode is a carbon brush with a diameter of 3 cm and a length of 3 cm.

[0050] The microbial electrochemical sensor passes through the switch S between the anode 1 and the cathode 2 1 and load resistor R ex form an external circuit. The microbial ele...

Embodiment 2

[0073] (1) The microbial electrochemical sensor based on open circuit operation is the same as that in Example 1.

[0074] (2) The preparation method of the microbial electrochemical sensor based on open circuit operation is the same as that in Example 1.

[0075] (3) Under different background organic matter concentrations (that is, the concentration of sodium acetate in the anode culture solution), the early warning of different nitrate concentrations in the water environment based on the microbial electrochemical sensor operating in an open circuit

[0076] In this embodiment, the anode culture solution in (2) (include 0.164g NaAc, 0.31gNH in every liter of anode culture solution) 4 Cl, 4.4g KH 2 PO 4 , 3.4g K 2 HPO 4 ·3H 2 O, 0.1g CaCl 2 2H 2 O, 0.1g MgCl 2 ·6H 2 0, 12.5mL trace elements and 5mL vitamins) (i.e. the concentration of sodium acetate is 2mM) is replaced by the anode culture solution that the concentration of sodium acetate is respectively 1mM and 5mM,...

Embodiment 3

[0083] (1) The microbial electrochemical sensor based on open circuit operation is the same as that in Example 1.

[0084] (2) The preparation method of the microbial electrochemical sensor based on open circuit operation is the same as that in Example 1.

[0085] (3) In the presence of background organic matter concentration (i.e. the concentration of sodium acetate in the anode culture solution) and nitrate, the operating stability of the microbial electrochemical sensor based on open circuit operation

[0086] The anode culture solution in (2) of this embodiment (comprising 0.164g NaAc, 0.31gNH in every liter of anode culture solution 4 Cl, 4.4g KH 2 PO 4 , 3.4g K 2 HPO 4 ·3H 2 O, 0.1g CaCl 2 2H 2 O, 0.1g MgCl 2 ·6H 2 (0, 12.5mL trace elements and 5mL vitamins) (i.e. sodium acetate concentration is 2mM) after running for 20min, the anode culture solution is replaced with sodium acetate concentration is 5mM and contains 40mg / L NO 3 -N concentration of anode culture...

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Abstract

The invention relates to a method for prewarning nitrate in water. By the method, prewarning of the nitrate in water is achieved by monitoring the voltage change between an anode and a cathode of an open running-based microbial electrochemical sensor. The sensitivity of prewarning the nitrate in a water environment by running the microbial electrochemical sensor in an open mode can be 2-6 times higher than that in an access mode; moreover, signal interference caused by the concentration of background organic matters in the water is relatively small; meanwhile, under combined impact of the organic matters and the nitrate, effective prewarning can be still achieved; in addition, the stability is relatively strong during long-term running. By the method, a brand-new and effective way is provided for real-time online prewarning of the nitrate, and a strong guarantee is provided for drinking water safety and human health.

Description

technical field [0001] The invention belongs to the technical field of water environment monitoring, and in particular relates to a method for using a microbial electrochemical sensor based on open-circuit operation for early warning of nitrate in water. Background technique [0002] With the development of economy and society, the population pressure is increasing, so the application of nitrogen fertilizer in agricultural production has increased significantly. However, due to the low efficiency of nitrogen fertilizer application, the concentration of nitrate in water is on the rise. On the one hand, excessive nitrate concentration will aggravate the degree of eutrophication of water body, thereby threatening ecological security, and on the other hand, it will also endanger human health, which requires the monitoring of nitrate concentration in the water environment. At present, the monitoring of nitrate concentration is mainly carried out offline detection, which lacks tim...

Claims

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Application Information

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IPC IPC(8): G01N27/26
CPCG01N27/26
Inventor 梁鹏王东麟黄霞张潇源
Owner TSINGHUA UNIV
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