COD is normally higher than BOD because more organic compounds can be chemically oxidised than biologically oxidised. This includes chemicals toxic to biological life, which can make COD tests very useful when testing industrial sewage as they will not be captured by BOD testing.
What are the advantages of COD and BOD?
Chemical Oxygen Demand (COD) v/s Biological Oxygen Demand (BOD)
| BOD | COD |
|---|---|
| BOD is used to oxidize the natural organic matter and organic waste in the water | COD is capable of degrading the industrial sewage. COD does not measure the amount of oxygen consumed by acetates present in the water sample |
What are the advantages of COD?
Nutrition. Cod is a low-fat source of protein, making it an excellent choice for people who would like to reduce their fat intake and improve their heart health. Cod also contains a significant amount of iodine, which is an important mineral for thyroid function.
What are the disadvantages of COD?
Disadvantages of Cash on Delivery (COD) mode of payment
The seller at this point will have already incurred transportation costs which accumulate to a loss for the e-commerce business. 2. The business representatives will be handling a lot of cash through the COD system unlike in the use of credit cards.
What is the difference between BOD and COD which one is better and why?
Biochemical oxygen demand (BOD) is the amount of oxygen required by the microorganisms to break down the organic materials, whereas chemical oxygen demand (COD) is the amount of oxygen required to break down the organic material via oxidation.
Why is COD determination preferred over biological oxygen demand determination?
COD uses strong chemicals to oxidize organic matter. Generally, COD is preferred to BOD for process control measurements because results are more reproducible and are available in just two hours rather than five days.
What are the advantages of BOD?
The main advantages of this method compared to the dilution method are: simplicity: no dilution of sample required, no seeding, no blank sample. direct reading of BOD value. continuous display of BOD value at the current incubation time.
What is the difference between BOD & COD?
The main difference between BOD and COD is that BOD is the amount of oxygen which is consumed by bacteria while decomposing organic matter under aerobic conditions whereas COD is the amount of oxygen required for the chemical oxidation of total organic matter in water.
What is the limitation of COD test?
One of the main limitations of the COD test is its inability to differentiate between biodegradable and biologically inert organic matter on its own. The use of chemicals such as chromium and strong acids produce hazardous liquid waste, which requires careful disposal.
What are the limitations of BOD test?
Limitations Of Test
The method takes five days to perform and uses a discrete sample. The test has poor reproducibility and toxic chemicals can inhibit measurement. Short-term BOD determinations magnify errors and still require relatively long sample periods. The test is not suited for on-line, continuous measurement.
Is COD risky?
With COD, there’s also a higher risk of delivery refusal. This can be especially disastrous when suppliers are transporting perishable goods. When this happens, suppliers lose profit on returned or spoiled goods and may have to pay shipping return fees.
Why do people choose COD?
No online payment frauds
Security can be maintained in case of cash on delivery. You do not have to divulge any financial information, such as debit card, credit card, or bank account details to the seller. This is one reason why lots of customers prefer CoD as the preferred mode of payment.
What are the advantages and disadvantages of credit sales?
The advantages and disadvantages of selling to customers on…
- Competitive edge. Offering trade credit will give you a competitive edge over your business rivals.
- Increase in sales.
- Better customer loyalty.
- Funding your debtor book.
- Taking a credit risk with customers.
- Potential for bad debts.
Why COD is always higher than BOD for the same waste water sample?
The COD test uses a chemical (potassium dichromate in a 50% sulfuric acid solution) that “oxidizes” both organic (predominate) and inorganic substances in a wastewater sample, which results in a higher COD concentration than BOD concentration for the same wastewater sample since only organic compounds are consumed
Is COD always higher than BOD?
COD stands for Chemical Oxygen Demand, and it is the amount of oxygen that will be consumed by the chemical break down of both organic and inorganic compounds. As such, COD will always be higher than BOD.
What is COD & BOD in water?
The biochemical oxygen demand (BOD) represents the amount of dissolved oxygen (DO) consumed by biological organisms when they decompose organic matter in water. The chemical oxygen demand (COD) is the amount of oxygen consumed when the water sample is chemically oxidised.
Why Sulphuric acid is used in COD?
Chemical Oxygen Demand (COD) 1% Silver Sulphate in Sulphuric Acid (conc.) provides the primary and secondary digestion catalysts for oxidation of carbon during chemical oxidation.
What is a major disadvantage of using the BOD test for operational control?
The test has a number of disadvantages: a five-day incubation period, extensive sample preparation and, often, difficulties in obtaining consistent repetitive values. From an operations perspective, time lag is the biggest drawback to BOD (also referred to as Biological Oxygen Demand) analysis.
What is the significance of COD?
The COD is the estimate of oxygen required for the portion of organic matter in wastewater that is subjected to oxidation and also the amount of oxygen consumed by organic matter from boiling acid potassium dichromate solution.
What is the most common interference in COD experiment?
The most common interference, however, comes from chloride, as it can contribute to false high results when testing COD levels. Are any test methods available for desalination plants or other laboratories needing to test seawater, brackish, or polluted waters with high chloride levels?
How does COD affect water quality?
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.
Marilyn Medina is a food expert with over 15 years of experience in the culinary industry. She has worked in some of the most prestigious kitchens in the world, including The Ritz-Carlton and The French Laundry.
What makes Marilyn stand out from other chefs is her unique approach to cooking. She believes that food should be accessible to everyone, regardless of their budget or dietary restrictions. Her recipes are simple, delicious, and healthy – perfect for anyone who wants to cook like a pro!