Full-automatic on-line monitoring system of COD (chemical oxygen demand) and monitoring method thereof

Abstract

The invention relates to a full-automatic on-line monitoring system of COD and a monitoring method thereof. The monitoring system comprises a monitoring control device, and an electric injector, an optical quantifying device, a multi-pass adapter and a reaction tank that are in connection with the monitoring control device. Ventilation pipes are positioned between the electric injector and the optical quantifying device, and between the optical quantifying device and the reaction tank for connection. The multi-pass adapter is connected to the optical quantifying device, the reaction tank, an input pipe for a solution to be monitored, standard solution input pipes, a blank solution input pipe, a deionized water input pipe and a waste liquid discharge pipe. The inside of the reaction tank is provided with a working electrode, an auxiliary electrode and a reference electrode that are connected by leads and the monitoring control device. The monitoring method consists of: measuring the current change values of standard solutions of different concentrations, making a standard curve delta Ic-C by the monitoring control device automatically, measuring the current change value delta Ix ofthe solution to be monitored, seeking out and displaying a corresponding COD value from the standard curve by the monitoring control device. The system and method provided in the invention are characterized by accurate measuring, no pollution and high intelligent degree.

Description

technical field [0001] The invention relates to a water quality monitoring device, in particular to an automatic sample injection and automatic drawing of a standard curve △I by using air pressure difference c -C, a COD automatic online monitoring system and a monitoring method thereof that automatically obtain the COD value of the water sample to be tested. Background technique [0002] Chemical oxygen demand (COD) refers to the amount of oxidant consumed when a strong oxidant is used to treat water samples under strong acid and heating conditions, expressed as O 2 (mg / L) means that it reflects the degree of water pollution by reducing substances (mainly organic matter), is a comprehensive indicator for evaluating the degree of water pollution, and is also one of the important parameters for water quality monitoring. In order to effectively curb the deteriorating environment of water bodies, my country has formulated control targets for the total discharge of COD pollution...

AI Technical Summary

Problems solved by technology

[0006] The invention mainly solves the technical problems that the original chemical oxygen demand measuring device has secondary pollution in the detection process, low sensitivity, cannot be automatically diluted and cleaned, and cannot be automatically detected online; it provides a sample solution with short response time, stable signal A COD automatic online monitoring system with small dosage, low detection limit, high sensitivity, and wide linear range and its monitoring method. The method does not use any toxic and harmful substances in the detection process, and does not produce secondary pollution after detection. It is environmentally friendly. Moreover, the dilution, cleaning, and monitoring operations are all automated, just click the corresponding button, and the COD value will be directly displayed on the display screen after the measurement, without any manual conversion

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