Toc, tn, tp concentration and total amount continuous synchronous online monitoring method and instrument

Abstract

The invention relates to a continuous, synchronous and online monitoring method and instrument for the concentration and total quantity of TOC (total organic carbon), TN (total nitrogen) and TP (total phosphorus). The instrument mainly comprises an electromagnetic induction flowmeter, a sampling head, a reagent bottle, a carrier gas cylinder, an acidification reactor, an oxidation reactor, a semiconductor condenser, an ion absorber, a CO2 detector, a nitrate nitrogen detector, an orthophosphate detector and a data processor. The sampling head is connected with the acidification reactor through a sampling water pipe, a peristaltic pump and a flow sensor; ...; the CO2 detector, the nitrate nitrogen detector, the orthophosphate detector and the electromagnetic induction flowmeter are connected with the data processor by circuits. By means of the same set of sampling, acidification, oxidation, flow collection and data processing system and the three separate detectors, the concentration and total quantity of TOC, TN and TP in water can be measured continuously and synchronously. The instrument has the advantages of multifunction, compact structure, continuous data measurement, synchronism and instantaneity of measurement of different indexes, etc.

Description

technical field [0001] The invention belongs to the technical field of environmental monitoring. Specifically, it relates to an instrument and method capable of continuously and synchronously measuring the concentration and total amount of total organic carbon (TOC), total nitrogen (TN), and total phosphorus (TP) in water. Background technique [0002] Organic pollution of water bodies, also known as eutrophication pollution, is mainly due to human activities discharging excess nutrients into water bodies beyond the self-cleaning ability of water bodies. In water quality monitoring, total organic carbon (TOC), total nitrogen (TN), and total phosphorus (TP) are commonly used to measure the degree of organic pollution in water bodies. [0003] The best way to monitor and prevent organic pollution of water quality is to install online automatic detection instruments at sewage discharge outlets to continuously measure and monitor the concentration and total amount of environmen...

AI Technical Summary

Problems solved by technology

However, up to now, there are still the following shortcomings and deficiencies in the online automatic detection of water quality: (1) The function of the instrument is relatively single

But up to now, there is no analytical instrument that can simultaneously monitor the above three organic pollution indicators

(2) Cannot measure synchronously

Even multi-parameter analyzers mostly use different oxidation or color development systems, so it is difficult to achieve synchronization when monitoring different parameters. For example, the TN oxidation of QuickTNP uses a high-temperature combustion method at 1200 ° C, while the TP oxidation uses UV-persulfuric acid. Salt digestion method, its operation process is also separated; another example is Japan’s Shimadzu TNP-4110 total phosphorus and total nitrogen analyzer, which uses persulfate-ultraviolet oxidation digestion method in the measurement of TN and TP, but the two systems from the sample injection , Oxidation to detection, the whole process is also run independently. Another example is the 6B-2000 multi-parameter water quality rapid monitor from German WTW TresCon Company. Although it can monitor multiple indicators such as COD, ammonia nitrogen, total phosphorus, and total nitrogen, the adopted The multi-module design is nothing more than combining multiple test systems into one instrument, and its monitoring of different parameters is still carried out separately

This type of instrument is not so much a multi-parameter analyzer, but actually a simple combination of multiple single-parameter analyzers into one instrument, so it is difficult to achieve simultaneous measurement of multiple indicators; (3) Continuous monitoring is not possible

Existing TOC, TN, and TP analysis instruments generally take 30 minutes to 60 minutes to monitor a sample, from sample injection to oxidation to detection, even those products called online monitors, such as Phosphax Sigma of HACH in the United States, The Tres.Ccon of WTW in Germany and the TP800 of TORAY in Japan have a monitoring period of at least 20 minutes. In this respect, these instruments are still batch analyzers in essence, so it is difficult to achieve continuous real-time monitoring

(4) It is impossible to simultaneously measure the pollutant content and the total amount

5.2.2 of my country's "Technical Specifications for Monitoring Total Water Pollutant Discharge" HJ / T92-2002 clearly stipulates that wastewater flow and pollutant concentration should be measured at the same time, and the simultaneous and continuous monitoring of flow and pollutant concentration should be realized as much as possible. The instrument does not have the function of synchronous and continuous monitoring of the concentration and total amount of pollutants

[0004] In short, no matter at home or abroad, so far, there is no monitoring instrument and method that can continuously and synchronously measure the concentration and total amount of TOC, TN, and TP in water.

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