Sewage is a common water quality in our daily life, and the parameters contained in the pollution discharged by different industries are also different. When we analyze sewage, we generally need to monitor multiple parameters at the same time. Residual chlorine is an important factor for judging the situation of sewage. One of the factors is that in order to analyze whether the sewage produced by different industries can meet the discharge standards, it is necessary to monitor whether the residual chlorine
content in the sewage is normal after treatment. Therefore, it is necessary to monitor the water quality according to a certain frequency in the daily monitoring of sewage. The following Let's take a look at the monitoring frequency of residual chlorine in sewage. Monitoring frequency of residual chlorine in sewage Although there are many sources of sewage, the residual chlorine contained in sewage is the same in most cases, so it is only necessary to adopt the same monitoring frequency for different types of sewage. When monitoring residual chlorine in sewage, if other disinfection measures are taken, there is no need to make requirements for residual chlorine. In normal monitoring of residual chlorine in sewage, sampling is required on average every four hours, and at least three samplings are required within every 24 hours, and the measurement results need to be counted as daily average values. Since some sludge will be deposited during the sewage discharge process, we also need to monitor it before removing the sludge. The cycle is 180-360 days, and the waste gas generated during the sewage treatment process also needs to be deodorized. Sewage Residual Chlorine Monitoring Methods There are two main methods for monitoring residual chlorine in sewage, one is colorimetric method, and the other is iodine titration method. Both methods need to use chemical reagents. Let’s talk about the comparison below Commonly used colorimetry. Colorimetric method: (1) The temperature of the measured sewage is generally around 15-20 degrees Celsius. When the water quality is lower than this temperature, it is necessary to place the measured sewage in warm water to raise the temperature to the normal range, and then monitor the value. (2) Add 2-3 drops of o-toluidine solution to the colorimetric tube containing 5ml of monitoring sample sewage, and mix well. (3) Place the monitoring sample in a dark environment, let it stand for 14 minutes, and measure it with the residual chlorine standard colorimetric solution, and the result is the residual chlorine content of the sample. (4) When the concentration of residual chlorine in the sewage is high, it will produce orange yellow. If the alkalinity in the sample is too high and the concentration of residual chlorine is low, it may produce light blue or light green. In this process, it can be Adding 1ML (1+2) hydrochloric acid or 1ML o-toluidine solution can make it return to light yellow, and the measurement can be carried out again at this time. The above is the introduction to the monitoring frequency of residual chlorine in sewage. When we are treating sewage, we must analyze the sewage situation according to the standard monitoring frequency. After the measurement meets the standard, the sewage can be discharged normally.
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