What is the ratio of COD to BOD?

What is the ratio of COD to BOD?

In domestic waste the ratio between BOD/COD is 1:2. The COD/BOD ratio is useful for assessing the amount of sewage available for biological treatment.

What is biodegradability index?

The biodegradability index (BI) is an indicator of the toxicity of the wastewater and is defined as the ratio between BOD and COD. Its value varies from zero to unity. For the complete biodegradation of an effluent, its BI value must be above 0.3.

What is the value of COD BOD for non biodegradable wastewater?

Commonly BOD/COD values for municipal wastewater are greater than 0.5. While, for old landfill leachate some times equal to 0.1. BOD/COD has a great effect on treatment process. For wastewater with BOD/COD> 0.5, biological treatment is efficient.

What is the correlation between BOD and COD?

The only relation between COD & BOD is – COD > BOD. For most industrial process waste water, community sewage, drains and even some hetrogeneous sources, COD/BOD ratio has been found to be in a defined range and hence, COD result gives more or less BOD value range for such identifiable waste water.

How do you convert COD to BOD?

Typically, the average BOD result is divided by the average COD result to find a “conversion factor” between the two parameters. One would then multiply their COD results by this factor to estimate BOD.

Why is BOD COD ratio important?

Results of the investigation revealed that BOD: COD ratio is a good indicator for pollution measurement in river. It can be used as an indicator to predict the relationship of BOD and COD in the river. It is also found to be reliable and useful indicator to relate organic matter content in the river water.

What is biodegradability of wastewater?

The biodegradability [biological oxygen demand/chemical oxygen demand (B/C ratio)] of influent, as a measure of the degree of available energy and toxicity to microorganisms in AS, has been hypothesized to drive AS microbial community assembly.

What is the relation between BOD and biodegradable substances?

The larger of the BOD by the microorganisms related with larger of biodegradable matter. When the BOD is increased then the amount of dissolved oxygen is decreased as the dissolved oxygen is consumed by the bacteria. So the biodegradable matter also increased in nature.

What is the ratio of BOD to COD for a given wastewater sample?

For example, food processing wastewater will generally have a COD:BOD ratio of ~2:1, while textile wastewater that can contain dyes will often have a much higher COD:BOD ratio of ~5:1. To establish the COD:BOD ratio for your wastewater, simply have both COD and BOD run on several wastewater samples.

How do you calculate BOD and COD?

Divide the COD concentration by the BOD concentration for each sample and average the results….Can I use my COD results to predict my BOD?

Why is COD always higher than BOD?

COD is always higher than BOD because chemical oxidation is easier than biological oxidation.