What is BOD and tss?

Biochemical oxygen demand (BOD) is the amount of oxygen it takes to degrade organic matter. Chemical oxygen demand (COD) is the amount of oxygen required to oxidize organic compounds (>500 milligrams per liter). Total suspended solids
Total suspended solids
Total suspended solids (TSS) is the dry-weight of suspended particles, that are not dissolved, in a sample of water that can be trapped by a filter that is analyzed using a filtration apparatus known as sintered glass crucible.
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 (TSS) is the total amount of suspended materials (>250 milligrams per liter).


What is the relationship between BOD and TSS?

Biochemical oxygen demand (BOD) and total suspended solids (TSS) are related. A portion of the TSS, the volatile suspended solids, is degradable and exerts an oxygen demand in a facultative lagoon or BOD test. BOD is a measurement of the quantity of oxygen required by bacteria to degrade substrate.

What is BOD explain?

BOD, also called biological oxygen demand, is the amount of dissolved oxygen needed (i.e., demanded) by aerobic biological organisms to break down organic material present in a given water sample at certain temperature over a specific time period.


Does TSS affect BOD?

Reducing TSS will almost always reduce BOD too. First and foremost, use mechanical screens such as roto-strainers or bar screens to get large solids out.

What does BOD mean in wastewater?

Biochemical oxygen demand (BOD) represents the amount of oxygen consumed by bacteria and other microorganisms while they decompose organic matter under aerobic (oxygen is present) conditions at a specified temperature.


Biochemical Oxygen Demand (BOD) Training Video



What is TSS in water quality?

Total suspended solids (TSS) values are often related to the turbidity (cloudiness) of water. If TSS is high and the water is murky then light from the sun will not travel well through the water, making it difficult for plants and algae to grow.

What is BOD test used for?

BOD is commonly required testing for wastewater treatment plants to measure waste loads, efficiency and effectiveness of BOD removal, control of plant processes, and most importantly the concentration of the effluent that is discharged to water bodies..

What happens when BOD is high?

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 a normal BOD level?

Drinking water has a BOD level of 1 - 2 ppm. When the BOD value of water is in the range 3 - 5 ppm, the water is moderately clean. Polluted water has a BOD value in the range of 6 - 9 ppm. In polluted water, some organic waste is present.

What does high TSS mean?

High TSS in a water body can often mean higher concentrations of bacteria, nutrients, pesticides, and metals in the water. These pollutants may attach to sediment particles on the land and be carried into water bodies with storm water.

How TSS can be removed from water?

The first step, chemical treatment, breaks the solids and liquids apart by automatically adding pretreatment chemicals such as pH adjusters, polymers (coagulants and flocculants) or clay. The second step, mechanical filtration, physically removes the precipitated solid particles from the sludge.


How do you get rid of TSS in water?

Media filters are very effective at removing TSS, with removal rates ranging from 77 to 90 percent depending on the design. Vegetated filter, including dry swales, are also effective, with removal rates ranging from 39 to 78 percent depending on the design.

What causes high BOD in wastewater?

Sources: BOD represents the amount of organic matter in a water supply; therefore, it increases when decaying plants, human or animal waste, and other organic compounds are added to water.

What are the 4 types of BOD?

BOD technically stands for Biological Oxygen Demand BOD5 means the test has been run for 5 days. C-BOD means only the Carbonaceous Biochemical Oxygen Demand N-BOD means Nitrogenous Biochemical Oxygen Demand BOD5 typically includes C-BOD and N-BOD unless one or the other is inhibited.


Why is BOD removed from wastewater?

BOD is a crucial factor in refining wastewater.

It can also drain receiving waters of oxygen which can kill fish and harm the environment. Therefore it is important to control the level of BOD at every stage of the treatment process, and to remove as much as possible in the final stages.

What causes high TSS?

Erosion & Runoff

Increased erosion of banks of rivers and streams can increase the TSS level in water. The suspended particles released from dirt and soil can settle out across water and give it a murky appearance. Runoff — when water flows through eroding soil — may also produce similar results.

What is the main cause of TSS?

Causes of toxic shock syndrome

Toxic shock syndrome (TSS) is caused by either staphylococcus or streptococcus bacteria. These bacteria normally live on the skin and in the nose or mouth without causing harm, but if they get deeper into the body they can release toxins that damage tissue and stop organs working.


Does chlorine reduce BOD?

BOD reduction: Chlorine accomplishes BOD reduction by oxidation of organic compounds present in wastewaters. 4. Oxidation of metal ions: Metal ions which are in reduced state are oxidized by chlorine (e.g., ferrous to ferric ion and manganous to manganic ions).

Why is BOD important in water quality?

The BOD is an important parameter for assessing water quality. It deals with the amount of oxygen consumption (mg O2 L− 1) by aerobic biological organisms to oxidize organic compounds. Sewage with high BOD can cause a decrease in oxygen of receiving waters, which in turn can cause the death of some organism.

How is BOD related to water quality?

If the B.O.D. is high, that means that microorganisms are using most of the Oxygen. This situation makes it difficult for larger aquatic animals to survive. However, if the B.O.D. is low, there is an abundance of Oxygen which leads to good water quality.


How is BOD measured and calculated?

BOD is computed based on the difference between initial and final D.O. The test uses dilution water and a known amount of sample in a 250-300 ml incubation bottle. A small amount of seed is added to samples where microbial activity may not be present.

Does higher BOD mean more pollution?

A BOD test is typically carried out over a standard 5-day incubation period at 20°C (68°F) for the most accurate results. Generally, a higher BOD value indicates a higher level of water pollution, while a lower BOD value indicates less polluted, or cleaner water.

What is the difference between dissolved oxygen and BOD?

Difference between Biochemical Oxygen Demand (BOD) and Chemical Oxygen Demand (COD) Biochemical oxygen demand (BOD) is the amount of oxygen microorganisms require to break down organic materials. In contrast, chemical oxygen demand (COD) is the amount of oxygen required to break down the organic material via oxidation.


Is there any relation between higher BOD value with higher TSS value?

High total suspended solids (TSS) values in the effluent are often related to excessive solids generation due to an increase in BOD (Biochemical Oxygen Demand) loading or can indicate problems with the bacteria like nutrient deficiency.

What does a BOD of zero mean?

Bio-Chemical Oxygen Demand (BOD) of water is zero then the water is safe to drink. Bio-Chemical Oxygen Demand is the amount of dissolved oxygen needed by aerobic microorganisms to breakdown organic material present in water. BOD is used to measure water pollution as higher BOD means a higher amount of water pollution.