Does the higher the BOD content in the water, the higher the level of water pollution?

BOD is a measure of the amount of oxygen consumed by organic microorganisms in water to decompose organic waste (unit: mg L), in ecology and environmental science it can be used to monitor and evaluate the quality of water quality, the higher the value, the more organic pollutants in the water, the more serious the pollution. 。

The BOD value can also be used as a reference indicator of the quality of the water source, but it is not a very accurate quantitative method. BOD values are also commonly used in wastewater treatment plant specifications for wastewater treatment efficiency.

Most of the unpolluted and pure river water has a BOD value of 1 mg L, and the moderately polluted river has a BOD of 2 8 mg L. The urban wastewater is treated in three stages with an efficient BOD value of about 20 mg L.

The BOD value of untreated effluent varies widely, averaging about 600 mg L in Europe and about 200 mg L in the United States, but is even more variable in the presence of severe groundwater or surface water infiltration.

Yes, the higher the BOD content in the water, the higher the level of water pollution.

BOD is an abbreviation for Biochemical Oxygen Demand, which refers to the amount of dissolved oxygen consumed by microorganisms to decompose organic matter in a certain volume of water under certain conditions. This indicator reflects the degree of organic contamination in the water. Because organic matter is broken down by microorganisms in the water, the process consumes dissolved oxygen in the water, resulting in poor water quality.

Therefore, the higher the BOD content in the water, the higher the degree of organic pollution in the water, and the worse the water quality.

Chemical Oxygen Demand (COD) is a chemical measurement of the amount of reducing substances in a water sample that needs to be oxidized. The oxygen equivalent of substances (usually organics) that can be oxidized by strong oxidants in wastewater, wastewater treatment plant effluent, and contaminated water. It is an important and rapidly determined organic pollution parameter in the study of river pollution and the properties of industrial wastewater, as well as in the operation and management of industrial wastewater treatment, and is often represented by the symbol COD.

BOD: Biochemical Oxygen Demand or Biochemical Oxygen Consumption (5-day COD), a comprehensive indication of the amount of aerobic pollutants such as organic matter in water. Biochemical oxygen demand refers to the dissolved oxygen consumed by microorganisms in the decomposition of certain oxidizable substances in water, especially the biochemical process of decomposing organic matter, under specified conditions.

Normally, it means that the water sample is filled with a completely sealed dissolved oxygen bottle, incubated in the dark for 5 days at 20, and the mass concentration of dissolved oxygen in the water sample before and after incubation is measured respectively, and the dissolved oxygen consumed per liter of sample is calculated by the difference between the mass concentration of dissolved oxygen before and after incubation, which is expressed in the form of BOD5. Its units are expressed in ppm or milligrams. The higher the value, the more organic pollutants in the water, and the more serious the pollution.

In order to make the test data comparable, a time period is generally specified, during which microorganisms are cultured with water samples at a certain temperature, and the dissolved oxygen consumption in the water is measured, and a five-day period is generally used, which is called five-day biochemical oxygen demand, which is recorded as BOD5The higher the number, the more organic matter is in the water, and therefore the more polluted.

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At the same time, the ratio of BOD COD was used to characterize the biodegradability of wastewater. Under normal circumstances, if this ratio is greater than that of urban domestic sewage, it means that the biodegradability of sewage is good.

BOD and COD are commonly used indicators to indicate the strength of water pollution, and they are both biochemical oxygen demand indicators. Biochemical oxygen demand (BOD) refers to the demand for oxygen from organic matter in a water body, and is often used to indicate the content of biodegradable organic matter in a water body. The higher the BOD index, the higher the content of biodegradable organic matter in the water body, and the worse the water quality.

COD (Chemical Oxygen Demand) refers to the demand of all organic matter in the water body to pure oxygen disorder, and is often used to indicate the content of all organic matter in the water body. The higher the COD index, the higher the amount of organic matter in the water body, the worse the water quality. In conclusion, BOD and COD are both biochemical oxygen demand indicators, which can be used to indicate the pollution profile of a water body.

The index to evaluate the degree of water pollution should look at both the COD value and the BOD value, where ().

The value is the chemical oxygen consumption; BOD is the amount of oxygen supplied by the organism.

The value is the amount of chemical oxygen; BOD is Biochemical Oxygen Demand.

The value is the amount of chemical oxygen supply; BOD is the amount of oxygen supplied by the organism.

The value is the chemical oxygen consumption; BOD is Biochemical Oxygen Demand Deficiency Pie.

Correct answer: d

BOD is biochemical oxygen demand, and the higher its value, the better the water quality disturbance in the limb. (Hunger Relief).

a.That's right. b.Mistake.

Correct answer: B

COD: Chemical Oxygen Demand.

COD is the amount of senslippery oxidation consumed when a water sample is treated with a certain strong oxidant under certain conditions. COD is for reducibility in water.

An indicator of how much substance there is.

The greater the chemical oxygen demand, the more polluted the water body is by organic matter. It is mostly used for environmental monitoring in the fields of petroleum, chemical industry, medicine and health.

BOD: The amount of free oxygen consumed by aerobic microorganisms oxidatively decomposing organic matter per unit volume of water under aerobic conditions, expressed in milligrams of oxygen liters (O2, mg L). It is mainly used to monitor the pollution status of organic matter in water bodies.

Organism can be broken down by microorganisms, but microorganisms need to consume oxygen when they break down organic compounds in water, such as dissolved oxygen in water.

If it is not enough to supply the needs of microorganisms, the water body will be polluted.