COD water quality analyzer price

NegotiableUpdate on 04/02

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Overview

The COD online monitoring instrument for water quality is an online monitoring instrument. COD (Chemical Oxygen Demand) is a commonly used comprehensive indicator for evaluating the degree of water pollution. It is an abbreviation for chemical oxygen demand in English, and its Chinese name is "chemical oxygen demand" or "chemical oxygen consumption". It refers to the amount of oxygen consumed by using chemical oxidants (such as potassium dichromate) to oxidize and decompose reducing substances (such as organic matter) in water. It reflects the degree of pollution of water bodies by reducing substances. Online COD detector for wastewater ammonia nitrogen, total phosphorus, total nitrogen, residual chlorine, pH turbidity

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The reducing substances in water include various organic compounds, sulfides, ferrous salts, etc. But the main thing is organic matter. Therefore, chemical oxygen demand (COD) is often used as an indicator to measure the content of organic matter in water. The higher the chemical oxygen demand, the more severe the pollution of organic matter in the water body. The determination of chemical oxygen demand (COD) varies depending on the reducing substances in the water sample and the measurement method used. The currently used methods are acidic oxidation and oxidation. The K2MnO4 method has a lower oxidation rate but is relatively simple. It can be used to determine the relative comparison value of organic matter content in water samples. The potassium dichromate (K2Cr2O7) method has a high oxidation rate and good reproducibility, and is suitable for determining the total amount of organic matter in water samples. Organic matter poses a significant threat to industrial water systems. Water containing a large amount of organic matter can contaminate ion exchange resins when passing through desalination systems, making it particularly prone to contamination and reducing the resin's exchange capacity. Organic matter can be reduced by about 50% during pretreatment (coagulation, clarification, and filtration), but cannot be removed in desalination systems. Therefore, it is often brought into the boiler through feed water to lower the pH value of the boiler water. Sometimes organic matter may also be introduced into the steam system and condensate water, causing a decrease in pH and leading to system corrosion. High organic content in the circulating water system promotes microbial growth. Therefore, regardless of whether it is for desalination, boiler water or circulating water systems, the lower the COD, the better, but there is no unified limit index. When COD (DmnO4 method) is greater than 5mg/L in the circulating cooling water system, the water quality has begun to deteriorate

Online COD detector for wastewater ammonia nitrogen, total phosphorus, total nitrogen, residual chlorine, pH turbidity