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BOD tests the amount of oxygen that is used up in a sample due to organic matter (bacteria). The results tell us the quality of organic matter the sample. 5 days is the best time because after five days some of the bacteria changes and becomes nitrifying (feeds off nitrogen instead of oxygen). It's almost always used to test wastewater.
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What might you use when you wash in the morning?
You might use a toothbrush. You might use soap. You might use a sponge. You might use a towel. You might use a facecloth. You might use a facewash. You might use water.
What did the Mesopotamians use for the use of plow?
I think they use ox
When to use combiflam?
use it
How do you use brainboost?
You use it.
Which is the correct phrase every after use or after every use?
After every use.
How much is BOD value of drinking water?
There are generally no standards for an absolute BOD5 value of drinking water. However, a sample with a BOD5 between 1 and 2 mg/L indicates a very clean water
URGENT What are the theoretical BOD values for tap-water in Sydney?
BOD5 for tap water are usually 0 ppm,
Why cod higher than bod?
A COD test measures all of the chemicals in a sample which can be oxidized. A BOD5 test measures the total amount of food (or organic carbons) that bacteria can oxidize (in 5 days).A COD test result (that can be performed in about 2 hours) can be correlated to an expected BOD5 result (which takes 5 days).by rislys
Is BOD is greater than COD in waste water treatment?
COD is usually greater than BOD5 as it measures the oxidation of all organics, not just the biodegradable ones
What are the relationship between cod chemical oxygen demand and bod5 biological oxygen demand what does the ratio of bod cod or cod bod means?
BOD is inversely proportional to COD
What type of pollution do microorganism remove from real wastewater?
Microoganisms move primarily dissolved organic and some small organic particulates which contribute some toxicity but mostly BOD5 levels
Define oxidation pond?
wastewater treatment ponds used to remove organic material and pathogens so as to reduce the BOD5 content before disharging the waste into the aquatic ecosystem are called Oxidation Ponds
What is the Effects of temperature on BOD values?
BOD5 values are calculated at a fixed temperature as described in "Standard Methods for the Examination of Water and Waste Water" Highrer temperatures would lead to higher (wrong) values.
Why using phosphate buffer and magnesium sulphate and calcium chloride and ferric chloride for dilution water in BOD5 test?
magnesium sulphate, calcium chloride and ferric chloride are added to provided optimum environment and phosphate buffer is added to slow down the rate of death of microbes.
What is the factors which may affect the BOD experiment?
As BOD5 depends on the growth of microbes the test can be adversely affected by * Temperature * Toxics * Turbidity * Light * Agitation * Species of Microbe * Microbial contamination by a wild population * Nature of the organics present * Skill of the analyst * Data entry errors * Lack of blanks and samples of known strength * Equipment accuracy and maintenance
State the disadvantage of using BOD values?
As much as "Standard Methods" has a reproducible procedure for BOD5 the procedure is dependent on the activities of microorganisms and they can cause variations beyond the control of the lab worker - temperature, O2 diffusion, toxics etc can all affect the outcome. This is especiall true in ding round robin testing where a lab may be getting consistent results but not the same as another lab.
What Pollution comes from more than one source?
Many types of pollution are multisourced. Examples: * Carbon dioxide - fuel combustion, volcanos, respiration * Methane: Gas wells, cattle, anaerobic decomposition * SOx: Fuel combustion, volcanos, sulfur fires * Hydrocarbons (VOCs): Paint, pine forests, automobiles * Heavy metals: Mines, acid rain leaching, dumpsites * BOD5: Farms, sewers, cemeteries
