The presence of unwanted pollutants in water is termed water pollution. However, there are many methods to treat water pollution, and it helps minimize unwanted pollutants. In addition, many treatments are adopted to check various types of pollutants. The act has been formed to treat air pollution, and the clean air act fixed the limit of emission of air pollution from new sources. The water pollutants can be separated by physical, chemical and biological methods of treatment. The methods used to treat the water pollutants are classified as physical unit operation, chemical unit processes and biological unit processes. It is because so many methods have been developed for treating water and wastewater. In many cases, it has been observed that a combination of methods is required, and it will depend upon the quality of influent water and the quality of the effluent. There are many organic compounds, specifically synthetic ones, but these compounds are not suitable for biological treatment. The reason behind it is they are very poisonous to microorganisms due to their metabolic inertness. The organic material needs treatment of various inorganic pollutants. Chemical oxidation as one of the processes is considered to remove the pollutants and considered as an advantage. The most common technologies used for treating contaminated underground water and soils are bioremediation and soil vapor extraction. The purpose of this is to convert harmful substances into non-toxic compounds. They are the best technologies for treating chemical spills and dangerous wastes, and they are also used to degrade petroleum products and hydrocarbons.
With time, many tests have been developed to treat the organic matter in water. The tests that are required depends upon the absorptions of organic matter that is greater than 1 g/m3. Therefore, it is also included as the range between 10-12 to 10-3 g/m3. The test is used to calculate mixtures of organic compounds that are found in water. The other test is used to quantify the traces of anthropogenic organic compounds in water. The laboratory test is commonly used to measure gross amounts of organic matter. The matter that is greater than 1 g/m3 include tests for:
Total Organic Carbon (TOC)
Chemical Oxygen Demand (COD)
Biochemical Oxygen Demand (BOD)
Total Oxygen Demand (TOD)
The COD is the chemical test, TOC and TOD are the instrumental tests, and BOD is a biochemical test that includes microorganisms. The BOD test was formed to check the depletion of oxygen in the stream because of the utilization by living organisms as the organic matter degrades. In simple terms, it is used to ascertain the number of biodegradable contents in wastewater. This test also gives the condition about those occurring naturally. The biochemical test is the only basis for ascertaining the treatment plant’s efficiency in stabilizing organic matter. The process of nitrification is essential for this process to happen. However, the quantity of ammonium-nitrogen in wastewater creates a new problem in calculating BOD.
Waste Water Treatment Process
Wastewater treatment plants achieve the required degree of treatment by using unit operations. The schematic joined treatment is known as the flow sheet under which many unit operations tend to create the sheets. To choose which method is to be adopted, the unit operations and other processes are combined. It also includes primary, secondary, and tertiary treatments as well.
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