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. Hydrogen peroxide (H2O2) has been used to reduce the BOD and COD of industrial wastewaters for many years.
Full Answer
How does BOD affect wastewater treatment?
To remove BOD, a wastewater treatment plant has to aerate the water, which requires a lot of horsepower, aka electricity. Greater BOD also ends up with greater amounts of sludge to dispose of.
How do you reduce BOD in a sewage treatment plant?
Some of the organic substances need more retention time inside the reactor (3 to 5 days) to degrade completely. As a final polishing step, one can also subject the final treated water y Ozone or hypochlorite treatment to further reduce the BOD values. How can I reduce the MLSS in a sewage treatment plant?
How do you get rid of CBOD in wastewater treatment?
Wastewater BOD Removal 1 CBOD Conversion Rates. Conversion rates for CBOD are measured in units of kilograms per cubic meter of beads per day (kg/m 3 -day). 2 Recirculating Filtration. Most CBOD removal problems are addressed with filters configured to recycle water multiple times through a PolyGeyser. 3 Concentrating Biosolids. ...
What is the major reason for high BOD in wastewater?
The major reason for higher BOD in wastewater is due to the presence of high amount of organic contents. The wastewater from Pulp & paper, Sugar Industries, Leather, Textile, food processing etc. has very high BOD load.
How do you reduce BOD levels in wastewater?
These are the best practices for reducing BOD and TSS that facility managers should know:Focus on removing TSS from wastewater first. ... Get a properly sized EQ tank. ... Control the pH of the waste stream. ... Install a modern plate pack DAF made of stainless steel or plastic. ... Use a regenerative turbine air dissolution pump.More items...•
What reduces BOD in water treatment?
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.
What would cause a 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.
Which wastewater treatment is reducing BOD levels the most?
The principal advantage of aerobic sewage treatment is its ability to rapidly and completely digest sewage, reducing BOD to low levels.
Does aeration remove BOD?
Successful BOD removal in an activated sludge process depends on studying and controlling some basics such as wastewater characteristics. Aeration is used to operate activated sludge process units and is perhaps the most frequently used process to remove biochemical oxygen demand (BOD) from wastewater.
What causes BOD to decrease?
Three common BOD reduction methods for wastewater treatment are: Wastewater clarification. Wastewater separation (Coagulation & Flocculation) Anaerobic microbial decomposition.
How can we reduce TDS in wastewater treatment?
Various methods such as physical adsorption, reverse osmosis (RO), distillation, precipitation, membrane filtration, and bacteria-based bioremediation have been developed to reduce/remove TDS from water streams (Pinto et al., 2016). Most of those methods, however, are not cost-effective and/ or environmental friendly.
What does a high BOD indicate?
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.
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).
How BOD can be removed using activated sludge system?
In the activated sludge process, reactants, food, and microorganisms are mixed in a controlled environment to optimize BOD removal. The process incorporates the return of concentrated microorganisms to the influent waste.
What is BOD removal efficiency?
The BOD removal efficiency of Activated Sludge Process was ranged from 39% to 86% with an average of 61% (Table 1). The BOD removal efficiency of oxidation pond was ranged from 39% to 91% with an average of 69% (Table 2). The Chemical Oxygen Demand (COD) of the wastewater varied from 51 mg/l to 392 mg/l.
What is activated sludge how it helps to reduce BOD of sewage water?
When this activated sludge adds to raw sewage, it oxidizes the organic solids within the sewage. It also separates solids that have dissolved into the sewage mixture, and therefore it makes filtration easier. In an activated sewage system, the settled raw sewage and activated sludge are added to an aeration tank.
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 are the elements that make up waste water?
Wastewater contains many elements which break down into two groups, organic and inorganic substances.Organic substances include dish soaps, fecal matter, and food particles. These elements break down and feed bacteria which exist in the septic system. Bacteria naturally decomposes organic matter, but requires oxygen to do so.
Is a septic system aerobic or anaerobic?
Many septic systems have both an aerobic and anaerobic process, while others focus on reducing the need of BOD altogether.
BOD Compliance
High concentrations of BOD in wastewater can lead to regulatory issues. By implementing a system to effectively reduce the BOD in the wastewater stream your company will have the ability to remain in compliance and reduce risk. This will save your company regulatory costs.
COD Compliance
Effluent with high concentrations of COD can lead to compliance issues. Our wastewater systems can significantly reduce the Chemical Oxygen Demand in your wastewater. We have saved our customers surcharges and headaches by reducing their COD wastewater.
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What is a BOD in wastewater?
Biological Oxygen Demand (BOD) is a chemical procedure for determining the amount of dissolved oxygen needed by microorganisms to break down organic matter.
What is a BOD tank?
BOD - Aeration Tank Process. In a conventional BOD Wastewater Treatment process, microorganisms use oxygen to break down organic compounds. The microorganisms essentially consume the organic matter, but there must be enough oxygen in the water. If there isn’t enough oxygen in the water, the microorganisms will die.
How does a sludge thickener work?
When there is enough wastewater in the sludge thickener, the slurry from the tank is pumped into the Filter Press. The filter press separates the liquids and solids using pressure filtration. Sludge Cake will form between the filter plates, where it can be safely removed and easily discarded. The excess water is returned to the Initial Settling Tank.
How is wastewater collected?
Wastewater is collected in the Initial Settling Tank or the Primary Clarifier . The main function and purpose of the Initial Settling Tank is to make the wastewater homogeneous, and it allows for solids to settle to bottom of the tank forming sludge. The sludge collect is removed and piped over to the Sludge Thickening Tank. While the Setting Tank will remove much of the initial solids, there are organic compounds will not settle, and it will need to be treated in the Aeration Tank or a DAF Clarifier, depending on the specific application.
What is the purpose of diffused air in wastewater?
Diffused Air supplies the aeration tank with an ample amount of oxygen. The organic compounds in the wastewater provide the microorganisms their “food”. Since microorganisms will multiply in the wastewater over time, it is essential to have the correct balance of Oxygen, Organic Matter, and Microorganisms.
Where is the waste activated sludge collected?
The Waste Activated Sludge from the clarifier is collected in the Sludge Thickener. The thickening tank will provide additional solid-liquid separation. Any liquid overflow will be returned to the settling rank. The thickened sludge will be processed by the Filter Press .
Does Met Chem offer start up?
Met-Chem can offer start-up and installation as an additional option. We can provide full support as you get your system up and running. We have installation technicians and technical representatives that we can send to your facility to make sure the system is running as it should.
What is aerobic BOD?
Aerobic BOD (Biochemical Oxygen Demand) removal is accomplished by direct removal of particulate organics and indirectly through the biological activity of the filter. AST’s bead filters can be configured to do both.
Why is recirculation important?
The need for recirculation is largely driven by the need to supply oxygen to the submerged bed. Recirculation also facilitates a longer contact time with the bacteria-laden bead media. Water is in contact for only about 20 seconds in a single pass through the bed.
What is a floating bead media filter?
A floating bead media filter acts as a fixed film reactor with bacteria growing on the surface of the beads in a layer that is a hundreds of microns thick . If biological activity is desired, the filter must be managed to encourage the culture of heterotrophic bacteria. Typical control issues include flowrate, substrate concentration, oxygen supply, backflush frequency, temperature, and pH. Fortunately, development of a heterotrophic fixed film is a natural process easily accomplished in an expandable granular format. All PolyGeysers used as biological filters should employ EN media which displays a better porosity and provides protection for the biofilm during high frequency backwashing events. The units display a high specific surface area for biofilm development in the range of 1100-1200 m 2 /m 3.
Can beads be used as roughing filters?
The PolyGeyser units are virtually impervious to biofouling, and with a high backwashing frequency, they can be effectively used as roughing filters reducing particulate BOD of raw wastes with high BOD and TSS concentrations.
Do bead filters nitrify?
All bead filters nitrify even at high organic loadings as long as oxygen is present in the bed. It must be presumed that a nitrifier seed is available in any effluent sample collected, thus inhibition (CBOD) is required to get an accurate assessment of organic reduction.
How to reduce COD in wastewater?
There are various proven methods for COD reduction in wastewater management. Two of the most common techniques for COD wastewater removal are: 1 Wastewater separation (coagulation and flocculation) 2 COD removal by microbial action.
Why is chemical oxygen demand important in wastewater treatment?
A key benefit of knowing the chemical oxygen demand in wastewater treatment is that it helps industrial and municipal clients determine the best method for treatment and the most effective structure for their wastewater treatment facility.
What does high oxygen demand mean in water?
High chemical oxygen demand in water indicates greater levels of oxidizable organic matter and consequently, a lower amount of Dissolved Oxygen (DO). Critical DO depletion due to organic contamination can kill off aquatic life forms.
What is the best way to remove COD from sewage?
Another efficient technique for COD removal is to introduce bacteria or microorganisms that break down organic compounds present in the wastewater. Microbes in sewage treatment can be aerobic or anaerobic.
Is anaerobic COD removal good for wastewater?
It is a highly beneficial method because the biofuel generated from the process can be utilized as an alternative energy source for power, heating, and drying applications. Anaerobic COD removal is suitable for wastewater with COD > 2000 mg/L.
Is a BOD test lower than a COD test?
Thus, BOD is typically lower than COD for the same sample. Moreover, a standard COD test can be done in a few hours, unlike a BOD test which requires a standard 5-day incubation period.
What is the chemical used to oxidize BOD?
Direct Chemical Oxidation Using Hydrogen Peroxide. Hydrogen peroxide can be used alone or with catalysts – such as iron (Fe2+ or Fe3+), UV light, ozone (O3) and alkali – to oxidize BOD/COD contributing compounds in wastewaters. The type of oxidation needed depends on the type of BOD/COD present.
Why install an anaerobic tank before aerobic zone?
Install an anaerobic and anoxic tank before aerobic zone (i.e. before aeration tank) because they significantly reduce the BOD load. Hope this helps.
Can H2O2 be used as a stand alone treatment?
As indicated by these examples, H2O2 can be used as a stand-alone treatment or as an enhancement to existing physical or biological treatment processes, depending on the situation. Discussion of H2O2 Applications and Mechanisms. Direct Chemical Oxidation Using Hydrogen Peroxide.
What are the problems with biological wastewater treatment systems?
Common engineering and design issues. Most problems with biological wastewater treatment systems occur at the engineering and design stages. When studies aren’t completed for long enough periods of time over vast-enough amounts of data, it’s common for a system to fall short in some way. Here are some of the engineering ...
Can you meet your effluent limits?
This means you won’t meet your effluent limits and could encounter surcharges or fines. You may even have your plant shut down if you’re discharging to a creek or a river, and you have excess pollutants in your effluent because you’re not controlling the pH.
Is biological wastewater treatment a good investment?
Biological wastewater treatment systems can be a big investment for your facility . When implemented correctly, these systems will provide your process with a long list of benefits, but there can be some challenges with purchasing these systems, too. If your facility is considering biological wastewater treatment, ...
Is oxidation a biodegradable waste?
It’s important for your water treatment specialists to look at the ratio of BOD to COD to ensure the waste is, in fact, biodegradable and there is not much toxicity. Dairy products, cheese, and whey, etc., produce highly biodegradable waste, ...