The Ministry of Environmental Protection released 3 environmental monitoring technologies that encourage development

In order to implement the spirit of the "State Council's Decision on Implementing the Scientific Concept of Development and Strengthening Environmental Protection" (Guo Fa [2005] No. 39) and the "State Council's Notice on Printing and Issuing a Comprehensive Work Plan for Energy Conservation and Emission Reduction" (Guo Fa [2007] No. 15) To speed up the demonstration, application and promotion of pollution prevention and control technology, and guide the development of the environmental protection industry, the Ministry of Environmental Protection organized the 2010 National Advanced Pollution Prevention and Control Demonstration Technology List (hereinafter referred to as the "Demonstration List") and the "Environmental Protection Encouraged by the State "Technical Catalog" (hereinafter referred to as "Encouragement Catalog"), and published on December 31, 2010. The "National Advanced Pollution Control Demonstration Technology List" and the "Environmental Protection Technology Catalog Encouraged by the State" issued in 2009 were abolished at the same time. The new technologies and new processes listed in the “Demonstration List” are innovative in technical methods and advanced in technical indicators, and have basically reached the level of practical engineering applications. The technologies listed in the "Encouragement Catalog" are mature technologies that have been proven by engineering practice. The state encourages the demonstration and promotion of new technologies and new processes in the “Demonstration List” and the application of pollution prevention and control technologies in the “Encouragement List”. There are three items of environmental monitoring and detection technology in the 2010 "Environmental Protection Technology Catalog Encouraged by the State".

Monitoring and testing technology:

1 Simple transient operating conditions (quality method) emission detection system

This technology uses a vortex junction flowmeter and an oxygen dilution ratio to calculate the exhaust emission volume per second during the transient test, collects the second data by the gas analyzer, and aligns it with the gas flow data in time to calculate the second pollutants Emission quality (g / s), and finally calculate the total pollutant emission quality result, and send it to the host computer to calculate the emission quality of each pollutant per kilometer. The technical misjudgment rate is less than 5%, which can basically reflect the emission characteristics of the actual driving of the vehicle.

Suitable for motor vehicle exhaust gas detection.

2 On-line monitoring technology of flue gas moisture

The technology uses the principle of resistance-capacitance method and adopts online diffusion method to monitor the moisture content of flue gas online for a long time. The temperature measurement range is 0 ～ 180 ℃, the moisture measurement range is 0 ～ 40vol%, and the response time is less than 3s.

It is suitable for online monitoring of flue gas emissions from stationary sources such as electricity, steel, petrochemicals, and cement.

3 ammonia nitrogen online monitoring technology

(1) The technology uses spectrophotometry, using a flow injection analysis technology (FIA) and a gas-liquid separator composed of ammonia nitrogen online analyzer, using inexpensive and non-toxic acid-base indicator as absorption indicator, measuring range 0.05 ~ 300 mg / L, detection limit 0.05 mg / L, accuracy 1% FS, stability less than 8% FS, accuracy 2% FS. Free ammonia or ammonia nitrogen in the form of ammonium ions reacts with Nessler's reagent to form a yellow-brown complex. The color of the complex is proportional to the ammonia nitrogen content, which can be determined by spectrophotometry.

(2) This technology uses ammonia gas sensor to measure ammonia nitrogen in water. Ammonia gas sensor includes flat-head pH glass electrode and silver / silver chloride electrode. The two electrodes are assembled together by the inner filling solution containing ammonium ions , As a pH measurement pair. The inner filling liquid is separated from the sample by a gas permeable membrane. When the electrode is immersed in the test liquid to which the reagent is added, the ionic ammonium in the test liquid becomes free ammonia, which passes through the gas together with the free ammonia in the test liquid The permeable membrane enters the inner filling liquid, which changes the pH value of the inner filling liquid and generates a voltage change signal proportional to the logarithm of the sample concentration. The measurement range is 0.05 ～ 500 mg / L, the detection limit is 0.05 mg / L, and the measurement error is ± 2% FS.

Suitable for surface water, pollution source, groundwater and municipal sewage monitoring

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