Biological Oxygen Demand (BOD) The amount of oxygen, taken up from the microorganisms that decompose the natural waste matter in wastewater is named Organic oxygen demand or biochemical oxygen demand.
In spite of its popular use, there are some difficulties associated with COD measurement. One of many main challenges is the use of hazardous chemicals in the measurement approach.
BOD and COD correlate with one another in pretty much all samples, but BOD is often decrease than COD given that the biochemical breakdown of organics is often not as finish since the chemical strategy.
COD is best suited for swift and Repeated checking of treatment method plant performance and water high quality.
The dichromate oxidizes the natural and organic issue while in the sample, and the surplus dichromate is then titrated using a lessening agent to ascertain the amount of dichromate which was eaten.
Nền tảng cho thử nghiệm COD là gần như mọi hợp chất hữu cơ đều có thể bị oxy hóa đầy đủ để tạo ra dioxide cacbon bằng các chất oxy hóa mạnh trong các điều kiện axít.
Digestion is performed by refluxing (one hundred fifty °C). The surplus of dichromate is usually based on titration or spectrophotometry, and applying mercury salts to reduce the interference attributable to chlorine is needed. Dichromate is considered as the best oxidizing agent and also the geared up Remedy is stable for a long period, the most important dilemma click here that shows is the technology of hugely toxic squander [12, 59].
Chemical Oxygen Demand is a crucial parameter in wastewater cure and h2o excellent Examination. It provides a measure of the capability of drinking water to take in oxygen throughout the decomposition of organic and natural matter plus the oxidation of inorganic chemicals.
All authors contributed towards the examine conception and design. The reasoning for your write-up was by PBH. The literature lookup and the 1st draft of the manuscript were prepared by.
Measuring COD might also give a sign from the necessary read more sizing of the wastewater remedy plant for a certain place and the required procedures.
Method Summary – An aliquot on the sample is digested for 2 hours at 150°C while in the existence of dichromate and sulfuric acid. The ensuing Answer is titrated to a colored endpoint with ferroin indicator or Read more a spectrophotometer at an correct wavelength.
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COD measurements are applied to watch and Management the treatment method processes in a wastewater procedure plant. By measuring the COD in the influent and effluent, operators can figure out the performance with the treatment method processes and make changes as required.