水中 COD 化學需氧量的分析與監測方案
Why Measure Chemical Oxygen Demand (COD)?
When treated wastewater is discharged into the environment, it can introduce pollution in the form of organic content to receiving waters. High levels of wastewater COD indicate concentrations of organics that can deplete dissolved oxygen in the water, leading to negative environmental and regulatory consequences. To help determine the impact and ultimately limit the amount of organic pollution in water, oxygen demand is an essential measurement.
When treated wastewater is discharged into the environment, it can introduce pollution in the form of organic content to receiving waters. High levels of wastewater COD indicate concentrations of organics that can deplete dissolved oxygen in the water, leading to negative environmental and regulatory consequences. To help determine the impact and ultimately limit the amount of organic pollution in water, oxygen demand is an essential measurement.
當處理後的廢水排放到環境中時，它會以有機物的形式對受納水域帶來污染。高濃度的廢水 COD 顯示有機物的濃度會耗盡水中的溶氧，導致負面的環境並且無法符合水質法規標準要求。為了幫助了解對環境的影響並且限制水中有機污染的量，需氧量是一項重要的水質測量指標。
At Hach®, find the testing equipment, resources, training and software for COD measurement and management during water treatment.
Featured COD Product Categories
無論何種產業應用, Hach提供您精確可靠的Chemical Oxygen Demand (COD) 分析監測方案
Which Processes Require Chemical Oxygen Demand Monitoring?
COD Testing Advantages
COD is most suitable for rapid and frequent monitoring of treatment plant efficiency and water quality.
This method is more accurate than BOD (with a 5-10% relative standard deviation) and it offers a relatively short analysis time (2-hour digestion time), compared to the 5-day BOD test.
The COD oxidant is not affected by toxic materials in the sample.
Changes in the COD value between influent and effluent may parallel BOD content and supplement BOD results.
COD is most suitable for rapid and frequent monitoring of treatment plant efficiency and water quality.
This method is more accurate than BOD (with a 5-10% relative standard deviation) and it offers a relatively short analysis time (2-hour digestion time), compared to the 5-day BOD test.
The COD oxidant is not affected by toxic materials in the sample.
Changes in the COD value between influent and effluent may parallel BOD content and supplement BOD results.
COD Testing Limitations
Some organic compounds are not oxidized completely with the COD method.
COD measurement can experience interference from chloride ions.
Some organic compounds are not oxidized completely with the COD method.
COD measurement can experience interference from chloride ions.