What does BOD5 stand for?

Table of Contents

Biochemical oxygen demand
Biochemical oxygen demand (BOD5) is the most widely used parameter applied to wastewater. It’s a measure of the dissolved oxygen required by microorganisms to oxidize or decompose the organic matter in wastewater.

What is effluent COD?

COD in wastewater refers to the amount of oxygen required to degrade all oxidizable compounds in a measured sample of effluent. You can find the COD value in wastewater by carrying out a COD test.

What is the BOD5 test?

The standard oxidation (or incubation) test period for BOD is 5 days at 20 degrees Celsius (°C) (BOD5). The BOD5 value has been used and reported for many applications, most commonly to indicate the effects of sewage and other organic wastes on dissolved oxygen in surface waters (see TECHNICAL NOTE).

What does high BOD5 mean?

Because of this standardized time, BOD is often referred to as BOD-5. 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.

What is the difference between BOD5 and COD?

COD is closely related to BOD or Biochemical Oxygen Demand, the difference being that BOD is a test of the level of organic matter that can be biologically oxidised while COD is a test of the amount of organic matter that can be chemically oxidised.

What is BOD5 and BOD20?

BIOLOGICAL WASTE TREATMENT EXPERT The oldest tests are the microbial based BOD5 and BOD20. In these tests, a diluted sample of the influent is allowed to react with a microbial seed @ 20 Deg C for either 5 or 20 days. During this time, the microbes consume oxygen while digesting organics in the influent.

What is soluble COD?

Soluble COD means chemical oxygen demand and shall be determined under recommended laboratory procedures after laboratory filtration of the waste as set forth in the latest edition Standard Methods for the Examination of Water and Wastewater published by the American Public Health Association, Inc.

What is COD Upsc?

Chemical Oxygen Demand (COD) COD measures the amount of oxygen in parts per million required to oxidise organic (biodegradable and non-biodegradable) and oxidizable inorganic compounds in the water sample.

What is the difference between BOD and BOD5?

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.

How do I lower my BOD5?

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.

Why is BOD5 used?

The BOD5 indicates how much dissolved oxygen (mg / l) is needed in a given time for the biological degradation of the organic wastewater constituents. This value is an important parameter for the assessment of the degree of pollution that wastewater represents for the environment (receiving water).

Is COD greater than BOD?

COD is normally higher than BOD because more organic compounds can be chemically oxidised than biologically oxidised. This includes chemicals toxic to biological life, which can make COD tests very useful when testing industrial sewage as they will not be captured by BOD testing.