Regarding our environmental protection situation is becoming more and more serious, waste water and waste gas discharge need to be monitored online by the online automatic monitoring system of pollutants, and can only be discharged normally after reaching the standard. Excluding electroplating, tanning and other heavy metals and waste water with high substance content, the online automatic monitoring of general industrial sewage and municipal sewage plants mainly includes four indicators: COD
, ammonia nitrogen, total nitrogen, and total phosphorus. Among them, COD and ammonia nitrogen have always been monitoring indicators, and total nitrogen and total phosphorus are newly added items in recent years. The following manufacturers of online water quality monitors will share with you a brief description of these four indicators in the online monitoring of sewage discharge. The full name of COD is chemical oxygen demand. It does not refer to a pollutant, but the amount of oxygen required for the oxidation of reducing substances in sewage. The reducing substances here mainly refer to organic matter. COD in sewage treatment is the amount of oxidant required to oxidize organic matter in one liter of sewage under certain conditions with potassium dichromate as the oxidant, expressed in CODcr. COD can reflect the pollution degree of sewage. The first-level A standard in my country's 'Pollutant Discharge Standards for Urban Sewage Treatment Plants' (GB18918-2002) requires 20mg/L. (COD online analyzer) Ammonia nitrogen refers to the nitrogen existing in the form of ammonium ions and free ammonia in water. The concept is relatively clear. It is required by the first-level A standard in the 'Pollutant Discharge Standards for Urban Sewage Treatment Plants' (GB18918-2002) It is 5 (8), and the indicators in brackets are when the water temperature is less than 12 degrees Celsius. (Ammonia Nitrogen Online Monitor) Total nitrogen is an important indicator to measure water pollution and also an important factor leading to eutrophication of water bodies. The reduction of the ammonia nitrogen index mentioned above is not to reduce the nitrogen content in the sewage, but to convert the nitrogen from ammonium ions or free ammonia into organic nitrogen, nitrate nitrogen, nitrite nitrogen and other forms, so the total nitrogen content in water received increasing attention. Total nitrogen, the general term for various inorganic nitrogen, organic nitrogen, etc. in water, is required to be 15 in the first-level A standard in the Discharge Standard of Pollutants for Urban Sewage Treatment Plants (GB18918-2002). (Total nitrogen online analyzer) Total phosphorus can be understood as the content of all phosphorus in water, and it is also an important factor leading to eutrophication of water bodies. The total phosphorus in sewage treatment is the result of the determination after converting various forms of phosphorus into orthophosphate. It is required to be 0.5mg/ L. (Total phosphorus online analyzer) The above content is a brief description of the online monitoring of sewage discharge.
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