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In order to protect the water environment, monitoring of sewage discharge must be strengthened. The water quality analyzer is a very good monitoring tool. The design of the inspection points and the quality of the instrumentation (mainly the water quality analyzer) play a vital role in the monitoring of the water environment. The following is a brief introduction of the design of the water quality analyzer in combination with the design of a wastewater treatment plant.
Working principle of water quality analyzer There are two types of water quality analyzers used in sewage treatment plants: pH meter and dissolved oxygen analyzer.
First, the working principle of pH meter (water quality analyzer)
The pH of the water depends on how much material is dissolved, so the pH can sensitively indicate changes in water quality. The change of pH has a great influence on the reproduction and survival of the organism, and also seriously affects the biochemical action of the activated sludge, that is, affects the treatment effect. The pH value is different, and the corresponding potential is different. It is converted into a standard 4-20mA output by the transmitter.
Second, the working principle of dissolved oxygen analyzer (water quality analyzer)
The oxygen content in the water can fully indicate the degree of self-purification of the water. For biological treatment plants using activated sludge, it is important to understand the oxygen content of the aeration tank and the oxidation ditch. The increased dissolved oxygen in the sewage will promote biological activities other than anaerobic microorganisms, thus removing volatile matter and being easy. Naturally oxidized ions purify the sewage. The amount of dissolved oxygen in water is generally measured by electrochemical methods. The higher the atmospheric pressure, the greater the ability of water to dissolve oxygen.