BOD In Wastewater
Wastewater
Wastewater, also written as waste water, is any water that has been adversely affected in quality by anthropogenic influence. Wastewater can originate from a combination of domestic, industrial, commercial or agricultural activities, surface runoff or stormwater, and from sewer inf…
What is bod in wastewater and why is it important?
As mentioned, BOD is a key indicator of organic pollution in wastewater. This means that the industrial sector is tasked with discharging their final water product only if it meets the right level of BOD.
What are the sources of BOD in sewage treatment?
The “Demand” part of BOD can have several different sources - natural materials like leaves and animal manure or man-made pollutants like waste from industrial activity are just a few examples of places anaerobic bacteria are borne from in our sewer collection systems.
What are the BOD reduction methods for wastewater treatment?
Three common BOD reduction methods for wastewater treatment are: Wastewater clarification and separation BOD reduction methods are part of the primary phase of wastewater treatment while anaerobic microbial decomposition is part of the second phase of treatment.
What is the permissible BOD level for wastewater disposal?
Regulations concerning permissible BOD levels for wastewater disposal in industries and municipalities vary from state to state. BOD is listed as a conventional pollutant under the U.S. Clean Water Act. Typical maximum values range from 10 mg/L for direct environmental disposal and 300 mg/L for disposal to sewer systems.
What is BOD in wastewater treatment?
BOD is a measure of the amount of oxygen required to remove waste organic matter from water in the process of decomposition by aerobic bacteria (those bacteria that live only in an environment containing oxygen).
How do sewage treatment plants reduce BOD?
You can reduce COD and BOD by adding hydrogen peroxide to the wastewater solution. The hydrogen peroxide will chemically attack the organics in the wastewater, degrading them and reducing the measured COD and BOD.
Why BOD removal of wastewater is necessary?
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.
Why BOD treatment for domestic waste water is important?
BOD has traditionally been used to measure of the strength of effluent released from conventional sewage treatment plants to surface waters or streams. This is because sewage high in BOD can deplete oxygen in receiving waters, causing fish kills and ecosystem changes.
Why is a high concentration of BOD in wastewater treatment plants bad?
A high concentration of wastewater BOD can lead to regulatory penalties and serious financial repercussions for the plant in question as they need to take extra measures to fix the problem. That’s why wastewater treatment plants are in need of a system that helps them to ensure that the BOD in the wastewater they process is reduced as much as possible.
What is BOD in wastewater?
As mentioned, BOD is a key indicator of organic pollution in wastewater. This means that the industrial sector is tasked with discharging their final water product only if it meets the right level of BOD.
What is the measurement of the total amount of dissolved oxygen being used by the microorganisms when organic matter?
BOD describes the measurement of the total amount of dissolved oxygen being used by the microorganisms when organic matter decomposes in the water. To put it more simply, the bacteria and other microorganisms in the wastewater need oxygen to break down biosolids through a process known as oxidation. If the pollution levels are high, too much activity from these microorganisms reduces the quality and oxygen level of the water.
What is removed during the BOD phase of wastewater treatment?
Some of the other heavier chemicals like nitrogen, phosphorous, and others are also removed during this step, but they are further captured in the secondary part of wastewater treatment.
Why is in pipe technology used in wastewater?
Case studies of In-Pipe in real wastewater plants across the city have found that the introduction of our technology has completely eliminated the need for expensive FOG clean-up crews because these blockages no longer appeared. That means no more overflow and no more bad odors. That’s why we believe in creating proactive solutions that will drive long-term performance.
What is wastewater treatment?
Wastewater treatment is a careful biological process. The microorganisms already naturally present in the wastewater do the majority of the work when it comes to reducing harmful nutrients and push clean water back into the waterways. The problem with this is that these microorganisms only come from what is already in the sewer collection system - mostly biosolids, kitchen food waste, and other effluents.
Why is BOD important?
That’s why BOD measurement is an essential part of maintaining and managing natural water quality. Some environmentally stressing factors like high temperatures during the summer, or the introduction of man-made materials like fertilizer to a primary water source can decrease the amount of dissolved oxygen available. This, in turn, causes additional stress on the aquatic wildlife and ecosystem.
What is the BOD5/COD ratio of industrial wastewater?
Industrial wastewater usually has a BOD5/COD ratio of less than 0.5. An exception to the rule can be found in industries that manufacture/ process food or beverages, where the said ratio is much higher.
What is the biological oxygen demand in wastewater?
The biological oxygen demand, ie, BOD in wastewater, is a measure of the quantity of bio-organic substances in wastewater. These can be in the form of fat, oils, carbohydrates and proteins. BOD also helps determine the quantum of organic chemicals contained in wastewater that are synthetic and biodegradable.
What does a BOD5/COD ratio mean?
A BOD5/COD ratio that is equal to or higher than 0.5 indicates fast biological decomposition.
What is the measure of biological oxygen demand?
Another useful measure of biological oxygen demand is chemical oxygen demand, or COD. COD can help gauge the quantum of both biodegradable and non-biodegradable organics.
What is BOD in wastewater?
Industries that discharge wastewater into municipal sanitary sewers or waterways are facing strict regulations on levels of biological or biochemical oxygen demand (BOD). Solid materials in wastewater can consist of organic and/or inorganic materials and organisms.
What is BOD discharge?
Worldwide commercial and industrial manufacturing operations require the best available wastewater technology methods to achieve biological oxygen demand (BOD) discharge compliance. Worldwide expansion of commercial production and manufacturing increases the levels of industrial liquid waste byproducts. Industries that discharge wastewater into municipal sanitary sewers or waterways are facing strict regulations on levels of biological or biochemical oxygen demand (BOD).
What is the purpose of a biological oxygen demand test?
Biological Oxygen Demand (BOD) is a chemical procedure for determining the amount of dissolved oxygen needed by aerobic biological organisms “bio-bugs” in a body of water to break down organic material present in a given water sample at a certain temperature over a specific time period. It is not a precise quantitative test, although it is widely used as an indication of the quality of water.
Does ALAR water treatment increase BOD?
ALAR Water Treatment provides these industries with cost effective wastewater equipment solutions in order to help achieve BOD discharge compliance.
Why is BOD important?
BOD is a crucial factor in refining wastewater. The bacteria are important for breaking down substances, however too much BOD can cause unwanted amounts of bacteria. It can also drain receiving waters of oxygen which can kill fish and harm the environment.
Why is it important to remove solids from wastewater?
The importance of removing solids and BOD in wastewater is just as important to a small office park as it is to an entire city. Wastewater treatment utilizes several delicate chemical processes to achieve an acceptable quality of water, which is analogous to an acceptable quality of life. Wastewater contains many elements which break down ...
What is the most effective way to get inorganic solids out of a septic system?
Inorganic material and other TSS (Total Suspended Solids) are most effectively taken out of wastewater through the use of effluent filters .
What is wastewater receiving?
Wastewater Receiving: Phytoremediation to Clean it Up
What is the most effective way to remove inorganic material from wastewater?
Inorganic material and other TSS(Total Suspended Solids)are most effectively taken out of wastewater through the use of effluent filters. These filters will catch fine particles, drastically improving the wastewater's quality.
Why is it important to have bacteria?
The bacteria are important for breaking down substances, however too much BOD can cause unwanted amounts of bacteria.
Does bacteria decompose organic matter?
Bacteria naturally decomposes organic matter, but requires oxygen to do so. The larger and more numerous the organic matter, the more oxygen required to eliminate organic matter. The rate at which wastewater requires oxygen is known as the biological oxygen demand (BOD).
What is the importance of BOD in sewage treatment?
These are -. BOD finds its primary importance in sewage treatment plants. It gives the respiration rate of sewage, sludge , soil, garbage. It determines the rate of respiration in living beings. Measuring BOD gives the COD or Chemical Oxygen Demand of inorganic substances. It indicates the polluting potential of water.
How can the BOD of water be reduced?
The BOD of water can be reduced by reducing pollution. The lesser we contaminate the water bodies lesser is its biochemical oxygen demand levels. There are various treatments done to reduce BOD levels in various wastewaters.
What is the BOD of water?
Ans. BOD or Biochemical Oxygen Demand is the measure of the amount of oxygen utilized by aerobic microbes to degrade the organic waste present in water. It is calculated over five days at a specific temperature of 20°C.
Why is it important to reduce the biochemical oxygen demand of water bodies before discharging into water bodies?
It is extremely important to reduce the biochemical oxygen demand of water bodies or wastewater before discharging into water bodies because high BOD of water means more and more oxygen is utilized by the aerobic bacteria for breaking down the organic waste in the water. This significantly reduces the available oxygen for the respiration ...
How does pollution affect the BOD of water?
Sources that increase Biological Oxygen Demand of water are both natural and man-made. Pollution is a major contributor to increasing the BOD of water bodies. A good lifestyle is associated with an ample usage of water on a regular basis which results in a lot of wastewater with organic content in it. With increasing industrialization, pollution is increasing manifold. Factories have enormous wastewater being generated. Few industries that have huge quantities of wastewater are paper mills, food processing plants, jute mills, etc. The environmental factors contributing to increasing BOD include surface runoff, floating debris, dead animal and plants, soil erosion, etc. There are few chemicals that affect the BOD of drinking water. One of these is phosphate, which when present in high amount increases the BOD of water.
What happens when the BOD of a water body increases?
When BOD of a water body increases significantly, the aquatic life is adversely affected . The oxygen used by aquatic organisms for respiration and metabolism is significantly reduced by the microbes for breaking down of organic waste.
Why is it important to conserve water?
Water is a basic need for all life forms to exist on earth. Therefore it is extremely important for us to conserve water and not pollute it. Polluting water directly harms every living creature be it mankind or the other forms of life. Rising biochemical oxygen demand levels in water are harming the ecosystem of the water bodies which indirectly is harming the whole ecology of the whole biosphere as a whole. It is our duty to keep these ecosystems alive. The other forms of life have the same amount of rights on environmental resources as human beings. We must keep our greed’s away and strive towards conservation of water bodies and reduction of BOD levels in them.