How is effluent BOD calculated?
Calculating the effluent BOD or bsCOD
- Calculate the Effluent ‘biodegradable soluble COD’ Concentration (bsCOD)
- Calculate the ‘Hydraulic Retention Time’ (HRT)
- Calculate the Daily Sludge Production.
- Calculate the fraction of Biomass in the ‘Mixed Liquor Volatile Suspended Solids’ (MLVSS)
- Calculate the Observed Solids Yield.
What causes high BOD in wastewater effluent?
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 is the acceptable BOD value for domestic wastewater effluent?
300 mg/l
Influent BOD in normal domestic sewage is generally 300 mg/l and it is then treated to at least 25 mg/l (as per European norms) before discharge to minimise pollution potential.
What is BOD in wastewater?
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 is BOD concentration calculated?
The concentration of BOD (in mg/l) in the influent can be used to calculate the total BOD load per day being treated. This is simply done by multiplying the BOD in mg/l by the daily effluent volume in cubic metres (m3) and dividing the product by 1000.
What is the ratio of BOD COD in the final effluent?
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)….
| Type of wastewater | BOD/COD | BOD/TOC |
|---|---|---|
| Final effluent | 0.1 – 0.3 | 0.2 – 0.5 |
How do you reduce BOD in effluent?
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.
What happens if BOD is low?
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 a good BOD level?
A BOD level of 1-2 ppm is considered very good. There will not be much organic waste present in the water supply. A water supply with a BOD level of 3-5 ppm is considered moderately clean.
What is the BOD of normal water?
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.
How the BOD concentration can be minimized in wastewater?
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.
Is COD greater than BOD?
BOD can be higher than COD determined by dichromate oxidation in a few cases. The most common is a sample with very degradable organic matter and high organic nitrogen or ammonium such as wastewater from fish processing. In this case, measured BOD can be higher than measured COD.
How to calculate effluent soluble substrate concentration (bscod)?
Effluent soluble substrate concentration (bsCOD) is: S= g bsCOD/m3 [ Summary Related Calculations] [ Other Calculators] [ Converters] Documentation This formula will establish the wastewater bsCOD level after treatment: Where: S= effluent soluble substrate concentration (bsCOD) [g bsCOD/m3] Ks= half-velocity constant
How to calculate the wastewater bscod level after treatment?
This formula will establish the wastewater bsCOD level after treatment: Where: S= effluent soluble substrate concentration (bsCOD) [g bsCOD/m3]
What is meant by the effluent concentration?
The effluent concentration, ceff results from combining the gas streams of the individual phases of the last compartment (that is, the N th). For the various cases considered above, ceff is given as
What are the factors that affect BOD and COD levels?
Dyeing with very high COD and high SS effluent concentrations, with BOD levels dependent upon dye biodegradability, Printing with very high COD and high SS effluent concentrations and BOD levels dependent upon dye biodegradability, and