COD testing Can Be Fun For Anyone
COD testing Can Be Fun For Anyone
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The “cod” symbol will flash for three seconds, then the sample test consequence will surface in the Display screen as portion for every million COD. File the test consequence.
COD contrasts with biochemical oxygen demand (BOD), which depends on the usage of microorganisms to stop working the organic material from the sample by aerobic respiration above an incubation time period (generally five days).
COD is best suited for fast and Regular monitoring of cure plant efficiency and water high quality.
This technique is fairly basic and provides a quick and precise measure of COD. Even so, it's some cons, such as the utilization of hazardous chemicals and the inability to differentiate between biologically accessible and inert organic and natural issue.
As dichromate ion oxidizes natural make a difference from the sample, it's minimized to chromic ion, which can be mirrored by a alter in color from orange or yellow to inexperienced. The sample is then go through in the photometer or spectrophotometer to measure the modify in shade.
BOD refers back to the biological oxygen demand, which actions the more info amount of dissolved oxygen (DO) demanded by aerobic organisms (oxygen demand) to break down organic and natural waste product present inside a presented h2o sample at a given temperature and specified time.
Khối lượng oxy cần thiết để oxy hóa một hợp chất hữu cơ thành dioxide cacbon, amonia và nước được thể Helloện dưới dạng tổng quát là:
Just after dilution, the resulting difference between the initial and remaining DO looking at basically should be multiplied via the dilution factor to find out the ultimate BOD end result.
COD stands for “Chemical Oxygen Demand” and it is a evaluate of the amount of oxygen required to chemically oxidise natural substances in drinking water including ammonia or nitrate, in purposes including lakes, rivers or wastewater that have been contaminated by domestic or industrial squander.
Biochemical oxygen demand (BOD) is the level of oxygen necessary from the microorganisms to stop working organic and natural materials, Whilst chemical oxygen demand (COD) is the quantity of oxygen needed to break down the natural and organic materials get more info by way of chemical oxidation.
Hanna Suggestion: Because of the velocity of testing, facilities commonly establish a correlation amongst BOD and COD, then only run BOD at times. Even so, you should definitely Examine with your neighborhood regulatory company for in depth assistance on BOD and COD testing regimens.
Equally methods for COD testing demand the digestion move, so a heating block to your samples is crucial for making certain precise and repeatable benefits. For best final results, try to look for a heating block that functions various temperatures, so you've got utility for other tests, for instance complete phosphorus.
Significant COD degrees can suggest a higher amount of natural and organic pollutants during the wastewater, which may be damaging for the surroundings and human well being. Therefore, reducing the COD in wastewater right before it can be discharged is A serious objective of wastewater treatment procedures.