Which is greater BOD or COD?

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Which is greater BOD or COD?

COD stands for ‘Chemical Oxygen Demand’ where BOD stands for Biochemical Oxygen Demand. COD is normally higher than BOD because more organic compounds can be chemically oxidised than biologically oxidised.

Which water is high in BOD?

The dissolved oxygen readings are usually in parts per million (ppm). Higher BOD indicates more oxygen is required, which is less for oxygen-demanding species to feed on, and signifies lower water quality. Inversely, low BOD means less oxygen is being removed from water, so water is generally purer.

What is the ratio of BOD and COD?

Typical values for the ratio of BOD/COD for untreated municipal wastewater are in the range from 0.3 to 0.8 (see in table 3). If the BOD/COD ratio for untreated wastewater is 0.5 or greater, the waste is considered to be easily treatable by biological means.

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Is BOD more in polluted water?

Potable water contains less organic compounds than water that is polluted, so the BOD is lower.

How does COD differ from BOD?

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.

Which property BOD or COD will be higher for a water sample and why?

BOD measures the amount of oxygen required by the aerobic organisms to decompose organic matter and COD measures the oxygen required to decompose organic and inorganic constituents present in the wastewater by chemical reaction. Hence, the value of COD is greater than BOD.

What is COD water?

Chemical oxygen demand (COD) is the amount of dissolved oxygen that must be present in water to oxidize chemical organic materials, like petroleum. COD is used to gauge the short-term impact wastewater effluents will have on the oxygen levels of receiving waters.

What is BOD and COD in water treatment?

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.

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What is COD level in water?

The chemical oxygen demand (COD) is a measure of water and wastewater quality. The COD test is often used to monitor water treatment plant efficiency. COD is expressed in mg/L, which indicates the mass of oxygen consumed per liter of solution.

What is BOD of river water?

BOD is the oxygen in milligrams required for 5 days in one litre of water at 20 degree centigrade for the micro organisms to metabolise organic wastes. If the water, is polluted with sewage and other organic wastes, the BOD will increase.

What is the BOD of drinking water?

Biochemical oxygen demand of safe drinking water is zero. BOD represent the amount of biodegradable organic matter present in water.

What is the difference between cod and BOD in water?

To decompose or to be rotten any organic substance, there must need of oxygen for the reaction. On the other hand, BOD means, evry aquatic species need the least minimal oxygen to respiration to live on. It is related the stocking density of species along with the avlability of oxygen in the water. In general, COD is greater than BOD in water.

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What is the BOD to cod ratio for raw sewage?

the standard ratio BOD:COD is as 0.6:1.0 (BOD is about 60\%of COD) in standard raw communal wastewater in Europe. It seems, in Asia is the same ratio, the poeople have the same metabolismus. It is valid for standard sewage, without industrial or food industry waste water. In industrial water is wery diferrent ratio,…

What is the COD value in organic chemistry?

The COD value has been developed analogically to the BOD measurement. Since there are many organics which are rather hard or not possible to decompose biologically, a parameter has been defined indicating the amount of oxygen which would be needed when all organic ingredients would be oxidised completely.

What is the difference between cod and TOC in chemistry?

COD or Chemical Oxygen Demand is the total measurement of all chemicals in the water that can be oxidized. TOC or Total Organic Carbon is the measurement of organic carbons. BOD or Biochemical Oxygen Demand is supposed to measure the amount of food (or organic carbons) that bacteria can oxidize.