The wastewater from sewage treatment plants mainly comes from domestic sewage and industrial wastewater, such as the wastewater discharged from our daily life for flushing toilets, washing clothes, washing dishes, taking baths, etc., as well as some wastewater produced in the industrial production process. May I ask which chemical indicators are mainly analyzed in sewage treatment plants? The specific classification is as follows:
1.pH Value, this indicator is commonly used in the monitoring of many sewage and wastewater. The pH value can be determined by detecting the concentration of hydrogen ions in water with copper. If the pH value has a significant impact on the biological treatment of wastewater, the nitrification reaction will be very sensitive. The pH value of general urban sewage is between 6 and 8. If it exceeds this range, it indicates that a large amount of wastewater is being discharged.
2.The analysis of alkalinity is because it can reflect the ability of wastewater treatment to resist acid. Since the alkalinity in wastewater is very high, it can act as a buffer against changes in pH value, making the pH value relatively stable. In addition, the magnitude of alkalinity can be detected by using a small amount of strong acid in the water sample during the titration process.
3.COD (Chemical Oxygen Demand) refers to the content of organic matter in wastewater that can be oxidized by the strong oxidant potassium chromate.
4.BOD (Biological Oxygen Demand), mainly the amount of oxygen required for the biological degradation of organic matter in wastewater, can be regarded as an indicator for measuring the biodegradability of wastewater.
5.Nitrogen: The content of nitrogen in wastewater leaving the plant is never low, while the content of nitrate nitrogen and nitrite nitrogen is relatively low. Of course, the specific content still depends on where the wastewater comes from. For instance, in industrial wastewater, the content of organic nitrogen varies from water to water. Some industrial wastewater may have very low nitrogen content. When treated by biological methods, nitrogen fertilizer is added to supplement the nitrogen content required by microorganisms. If the nitrogen in the effluent is too high, denitrification needs to be carried out to prevent eutrophication of the water body in case of any possible occurrence.
6.HeavyMetals: The heavy metals in wastewater usually come from industrial wastewater and are highly toxic. Therefore, it is necessary to monitor the content of heavy metals in water online. If the content of heavy metals rises, it is very likely that there is a problem with the pretreatment.
7.Sulfides, once exceeding the standard, will give off a smell like rotten eggs and are corrosive. In severe cases, they can cause hydrogen sulfide and total nitrogen.
8.Total Residual Chlorine: If chlorine is used for disinfection but to ensure the reproduction of microorganisms during the transportation process, the total residual chlorine in the effluent is a control index for the poisoning process. At this time, the RCl900 – Total Residual Chlorine Online Analyzercan be used to detect the content of total residual chlorine in the water to ensure that it does not exceed the specified index. Thinking it would cause unnecessary harm!
The above information only covers some of the indicators that a sewage treatment plant needs to check. As for exactly what indicators to monitor, it still depends on the specific circumstances of the sewage treatment plant itself.
