Complex monitor for automatically monitoring multiple parameters of water on line

Abstract

The invention discloses a method for automatically monitoring water quality indexes on line and a device for implementing the method. A method of combining an ultraviolet and visible spectroscopy and various sensors is adopted, dozens of water quality indexes including chemical oxygen demand and ammonia nitrogen can be measured at one time, measurement indexes can be configured in a building block mode according to requirements, and chemical agents are not required. According to the device, the constructed digital optical fiber spectrometer is taken as a core, ultraviolet and visible absorption spectrum data of a water sample is processed in a mode of sequentially combining wavelet de-noising, principal component analysis and a support vector machine, and water quality indexes such as chemical oxygen demand and biochemical oxygen demand of water are acquired. Various physical and electrochemical sensors acquire water quality indexes such as ammonia nitrogen, dissolved oxygen and conductivity. All hardware and software for implementing the method is put in a cabinet to form the device, and the device analyzes the introduced water sample under the control of an embedded industrial control computer system, and automatically monitors the water quality indexes in real time.

Description

technical field [0001] The present invention relates to an online automatic water quality monitoring method and device in the field of environmental monitoring, in particular to a measurement method that combines ultraviolet-visible absorption spectrum with (physical or electrochemical) sensors and can simultaneously measure more than ten water quality indicators. And the online automatic monitor that adopts this method. Background technique [0002] At present, most of the instruments and equipment for on-line automatic monitoring of surface water and sewage water quality in my country use traditional laboratory chemical analysis methods, which have a long analysis cycle and cannot truly achieve the purpose of real-time on-line monitoring, and are prone to secondary pollution. Only one parameter can be monitored. The ultraviolet photometric method that uses UV method to monitor water quality COD indicators has opened the first optical method to directly monitor water qualit...

AI Technical Summary

Problems solved by technology

However, due to the complex and changeable composition of water samples, the color of the water body, particles and other interfering factors, it is difficult to develop the method and technology of absorption spectroscopy for water quality monitoring, and the technology and equipment are not yet mature and are still under development.

In addition, conventional water quality monitoring indicators such as ammonia nitrogen, dissolved oxygen, and electrical conductivity cannot currently be monitored by molecular absorption spectroscopy.

[0004] At present, the methods and technologies for automatic monitoring of water quality COD indicators using single or several wavelengths are relatively mature, and there are many mature instrument products on the market

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