How to remove BOD and COD for Wastewater treatments?
Chemical Oxygen Demand (COD) and Biochemical Oxygen Demand (BOD) are crucial water quality characteristic, which industrial and municipal authorities should be aware of, in order to choose the most effective wastewater treatment options for their effective treatment.
What is chemical oxygen demand (COD)?
Chemical Oxygen Demand (COD) is the quantity of oxygen needed to completely oxidize all organic molecules, both soluble and insoluble, that are present in a volume of water.
Typically, the COD value is given in milligrams per litre of water (mg/L).
Removing COD via microbial action
Adding bacteria or other microbes that break down organic components in wastewater, is an effective method for COD removal.
Aerobic COD elimination involves introducing bacteria or other microorganisms, which break down organic waste-derived substances into carbon dioxide and water, when there is air present. If COD levels are under 3000 mg/L, aerobic treatment is ideal for wastewater.
In the absence of oxygen, microorganisms are used for anaerobic COD removal to transform organic waste components into biomass. Thus, biofuel produced by this process can be utilized as a substitute source for power, and drying purposes. Wastewater with COD > 2000 mg/L is appropriate for anaerobic COD treatment.
What does biological oxygen demand (BOD) mean in the treatment of wastewater?
A measure of the amount of dissolved oxygen (DO) needed by aerobic bacteria to break down organic matter, in a sample of water throughout the course of a study is called biochemical oxygen demand (BOD) or biological oxygen demand (BOD).
The BOD value is typically given as mg/L, or milligrams of oxygen per litre of water.
Why is the measurement of BOD and COD important in wastewater treatment?
Biological Oxygen Demand (BOD) and Chemical Oxygen Demand (COD) are two of the most important parameters used to characterize, or measure the level of pollution in wastewater. COD measures all organic matter, whereas BOD only measures biologically degraded organic matter. As a result, COD is always greater than BOD.
Benefits of Monitoring BOD and COD
- The clarifier's performance can be improved.
- The sludge quality can be improved.
- Safe detection of industrial discharge.
- Lowers the cost of handling.
To summarize, the importance of addressing parameters stems from the fundamental premise that doing so, allows us to comply with government regulations. It has the potential to save us money because better treatment means less downtime, less capital investment, avoiding fines and penalties, and, most importantly, less stress for us and the environment.
Netsol Water offers advanced technology BOD and COD analyzers that can provide accurate data, in real-time. We should all strive to reduce our overall environmental impact. This not only saves money for our businesses, but it also addresses the bigger picture: sustainability.