Method and system for monitoring total phosphorus and total nitrogen of water quality on line

Abstract

The invention relates to a method and a system for monitoring total phosphorus and total nitrogen of water quality on line. The monitoring method comprises the following steps of: a, acquiring a water sample; b, performing ultraviolet digestion on the acquired water sample according to the principle of ultraviolet digestion and ultraviolet absorption methods; and c, discharging the digested water sample into a cuvette to perform ultraviolet absorption through ultraviolet light, and meanwhile calculating light intensity through a light sensitive sensor to obtain the concentration of pollutants. The detection system comprises a PLC, a CPU, a sample pretreatment device, a multi-way sampling valve, an injector, a reactor, a detector, a human-computer interface and a communication interface, wherein the sample pretreatment device, the injector, the reactor and the detector are connected to the multi-way sampling valve through pipelines respectively. The method and the system can efficiently, quickly, stably and accurately perform continuous detection, storage and forwarding on the concentrations of the total phosphorus and the total nitrogen, and have the advantages of high measurement precision, stable performance, high efficiency, small volume, light weight, convenient assembly and debugging, low cost, low energy consumption, independent use, long-term continuous work and the like.

Description

Technical field: [0001] The invention relates to an online monitoring method for water quality, in particular to an online monitoring method and a monitoring system for total phosphorus and total nitrogen of water quality. Background technique: [0002] At present, my country is facing increasing water pollution and deteriorating water environment. In order to effectively carry out water pollution control and improve the level of scientific management decision-making, the research and application of water and wastewater online analysis technology is imperative. The enrichment of nitrogen and phosphorus nutrients can easily lead to eutrophication of water bodies, cause the rapid reproduction of algae and other plankton, reduce the dissolved oxygen content of the water body, and eventually cause the decline or even extinction of algae, plankton and aquatic organisms. Therefore, total phosphorus (TP) ), Total Nitrogen (TN) has always been an important indicator of routine water qual...

AI Technical Summary

Problems solved by technology

However, the traditional methods of total phosphorus and total nitrogen analysis adopt manual sampling and laboratory manual analysis, the measurement period is relatively long, manual operation is complicated, and the goal of real-time monitoring cannot be achieved.

[0003] At present, the research and development and production of domestic water quality online analysis instruments have the following problems: (1) Most of the online analysis instruments are single-parameter online analysis instruments, which can only analyze one of total phosphorus or total nitrogen; (2) Some key components have a high failure rate , maintenance and replacement are more troublesome; (3) electrochemical analysis methods are preferred, and photometric analysis methods with higher resolution are rarely used; (4) operations such as heating, pressure digestion, and cleaning in existing analysis methods are " Forcibly "instrumented", the reliability of long-term work is very poor; (5) Some technical indicators such as analysis accuracy, failure rate, zero drift, etc. are not as good as foreign instruments

Water quality online automatic analyzer is a water quality analysis technology route implemented in recent years to meet the needs of environmental management, and the domestic application is still in the initial stage of development

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