The water quality online monitoring system can detect abnormal water quality changes as early as possible, and make early warning and forecast, which can effectively prevent downstream water quality from being polluted. In addition, it can also track pollution sources in time to provide relevant services for management decision-making. . The water quality online monitoring system is mainly composed of four departments: a monitoring center, a unit for collecting and transmitting data, an analysis test unit, and a sampling unit. The currently used online monitoring systems include UV, five parameters, TP, TN, TOC, NH3-N, and COD. Add Wechat, all you need are here:
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The first is the water quality online monitoring system monitoring center. The main function that the monitoring center can play is to receive, summarize and count the monitoring data of various pollution sources. Followed by the unit to collect and transmit data. The unit for collecting and transmitting data is generally a microcontroller, IPC, or programmable controller. In either case, the communication protocol is unified throughout the country, which helps to facilitate the instrument connection communication. You can use radio stations, local area networks, GSM, GPRS, and telephone lines in a variety of ways when transmitting data. The last is the sampling unit. At present, the main method of sampling is a submersible pump or a self-priming pump.
According to different principles, the methods used for line monitoring instruments can be divided into conductance method, ultraviolet catalytic oxidation-infrared absorption method, and combustion oxidation-infrared absorption method. Followed by NH3-N online monitoring equipment. The use of this instrument mainly includes the conductance method, ammonia gas sensing electrode method, ammonium ion selective electrode method, colorimetric method, titration method and the like. The last is the COD online monitoring instrument. According to different oxidation methods, this instrument can be divided into potassium dichromate oxidation and non-dichromate oxidation two ways.
The management and operation of the water quality online monitoring system can effectively ensure the normal operation of online monitoring. Therefore, the operation of the online monitoring system must be standardized. Relevant departments of environmental protection should carry out accreditation actions for operating units, and carry out assessments on the relevant operators to carry out certificates, prompting the on-line monitoring system of water quality to gradually become standardized. Only in this way can the orderly progress of urban water supply water quality online monitoring be promoted. 
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