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What is TOD BOD in water quality measurement?
There are three OD's used Total Oxygen Demand (TOD), Chemical Oxygen Demand (COD) and Biological Oxygen Demand (BOD) They all measure the amount of oxygen that would be required to consume organic material in the water, BOD is the lowest (usually) as it measures demand from microbes eating easily digested organics (sugars etc), COD measures the demand from all other organics (alcohols etc) measured by digesting the material in strong chemical oxidants, and TOD is the total of the two. Oxygen demand is important to know in waste handling as reducing the oxygen in receiving stream can harm fish and other aquatic life.
How does algae bloom affect dissolved oxygen?
Nutrients remove oxygen from water either by direct oxidation or through being consumed by plants or animals (bacteria). The potential for oxygen removal is measured by: BOD (biochemical oxygen demand) measures the amount of oxygen that bacteria can remove, COD (chemical oxygen demand) measures how much oxygen can be removed by chemical processes, and TOD (Total Oxygen Demand) is the total of all oxygen removed biochemically and chemically. Generally, colder water can hold more dissolved oxygen than warmer water. If you make a rough nomograph and plot the same amount of dissolved oxygen for a cold and warm temperature, you will see that the cold water is less saturated (can hold more oxygen) than the more saturated warm water. Nutrients effect oxygen levels indirectly in a process called eutrophication. If the nutrient happens to be a limiting nutrient (such as phosphate in lakes), then the carrying capacity of the photosynthetic organisms is raised. This allows for a population growth, commonly seen as algal blooms. The population of decomposers is then boosted too, since they feed (decay) on the phytoplankton/algae. As more and more organic material settles to the benthic zone, decomposers increase and need more oxygen for respiration. This results in oxygen depletion in the ecosystem, making life for marine animals such as fish difficult/impossible.
What animals live in a billabong?
Phytoplankton zooplankton Murray cod Estuarine Crocodiles eels bream flathead frogs Ducks and Geese insects Water Weeds Grasses Eucalyptus Flowering Trees yabbies
Why do you add mercuric sulfate in COD test?
Mercuric sulfate is added to complex chloride (and other halogen) ions. These ions interfere in the COD digestion by complexing with the silver to reduce its catalytic effect and by reacting with the dichromate to form elemental halogens thus giving falsely high readings.
Which north American landmark is constantly moving backward because of erosion?
The coastline of Cape Cod in Massachusetts is constantly moving backward due to erosion caused by wave action and storm surges. This natural process is gradually reshaping the land and altering the coastline of Cape Cod.
What is BOD and COD of spent wash?
COD=100 What is Bod
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?
The relationship between COD and BOD5 is that COD measures the total organic matter in water, while BOD5 measures the amount of oxygen required by microorganisms to biologically degrade organic matter. The ratio of BOD/COD or COD/BOD can indicate the biodegradability of organic matter in water; a high ratio suggests that the organic matter is easily biodegradable, while a low ratio indicates it is less biodegradable.
What is the significance of BOD and COD in water quality management?
Biochemical oxygen demand (BOD) and chemical oxygen demand (COD) both measure the quantity of organic compounds found in water. The makes them significant when is comes to the treatment of water.
Why does chlorine increased the numbers of COD and BOD in the wastewater?
No, not increasing because it is not reducing oxygen.But it can alter the measured BOD and COD rather unpredictable possibly by decreasing BOD and in- or de-creasing COD
Why cod is greater than bod?
COD measures the amount of oxygen required to chemically oxidize (break down) organic and inorganic matter in a water sample, while BOD measures the amount of oxygen consumed by microorganisms during a biological process that breaks down organic matter. COD typically gives a higher value than BOD because it includes both the chemical and biological oxygen demand in the water sample.
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
Rhymes with odd?
Rod Cod Bod Pod Wad
What is the values of COD and BOD in soft drinks?
me mama parri
What is the difference between BOD and COD?
1. COD or Chemical Oxygen Demand is the total measurement of all chemicals in the water that can be oxidized BOD- Biochemical Oxygen Demand is supposed to measure the amount of food (or organic carbons) that bacteria can oxidize. 2. COD is usually measured and the test is simple and easy to perform with the right equipment and can be done in 2 hours. BOD usually takes 5 days 3. Permissible limit of COD =250 to 500 ppm Permissible limit for BOD = 30 mg/L
Why do pollutants affect the amount of dissolved oxygen in water?
Some people get lazy and refuse to wash they re boat upon going into different waters and bring in invasive species which lower the oxygen levels. The worst is algae with uses the dissolved oxygen in the water to breath and suffocate the fish living below them.
Define the term cod and bod?
"COD" is Chemical Oxygen Demand," and BOD is Biochemical Oxygen Demand." These are the two processes that cause oxidation of an object in either a natural waterway or in industrial wastewater..
How does the temperature of water effect the dissolved oxygen?
Well, dissolved oxygen impacts water quality because if the level of the dissolved oxygen is too low then organisms can die. _________________________________________________________________ That is okay, but I want to what dissolved oxygen tests for. ------ For the water quality are tested: - total oxygen demand (TOD) - biochemical oxygen demand (BOD) - chemical oxygen demand (COD) - sometimes, carbonaceous biochemical oxygen demand (CBOD) For details about the analytical procedures I recommend you to read a book or a collection of analytical methods for water, searching in a library or searching on the Internet.
