This is a chemical reaction that involves a transfer of electrons from the activated carbon surface to the residual disinfectant. In other words,activated carbon acts as a reducing agent. Activated carbon's removal of chlorine reduces the chlorine to a non-oxidative chloride ion. The reaction is very fast and takes place in the first few inches of a new activated carbon bed. (Where removal of organics by activated carbon takes minutes, removal of chlorine literally takes seconds).
But at higher concentration it is an important greenhouse gas and is a major contributor to global warming. Carbon-di-oxide is a major component of vehicle exhaust. Figure- 4.3. Speed vs CO2 The products of complete combustion are water vapour and carbon-di-oxide alone. If more fuel is burnt more CO2 emissions are observed in the exhaust.
The major drawbacks of using the fossil fuels is they raises serious environment causes, like very high amount of carbon dioxide production which affects the humans and responsible for ozone layer depletion and global warming. Just because of it many cities world wide faces pollution problem, mainly in china who utilizes about 28% of world coal consumption.  Nearly 21.3 billion tonnes of carbon dioxide produces from the fossil fuel combustion, but due to natural processes half of the amount absorbed. Another pitfall of it is the amount of the fossil fuel present in the earth crust is limited. This is the reason behind the high cost.
Oxygen and fuel combustion produces approximately 75% less flue gas than air fuel combustion and produces exhaust consisting primarily of CO2 and H2O. The justification for using oxy-fuel is to produce a CO2 rich flue gas ready for "The process of removing carbon from the atmosphere and depositing it in a reservoir." This has significant advantages over traditional air-fuel combustion. The mass and volume of the flue gas is reduced, less heat is lost in the flue gas. The size of the flue gas treatment equipment can be reduced.
METHODOLOGY 1) CO-ELECTROLYSIS OF CO2 AND H2O The co-electrolysis of water vapor and carbon dioxide can be summarized by the following reaction: The first reaction to be considered is the reverse reaction of water gas shift: Another side reaction that can also affect the electrolysis operation is the formation of coke (carbon deposition on the surface of the electrolysis cell) as follows: At a temperature below 700 ° C, and in the presence of Ni as catalyst methane is formed according to the following reaction: Therefore it is preferable to use temperatures above 700 ° C to avoid the formation of methane. The reaction mechanism of co-electrolysis of H2O and CO2 is complicated and not fully understood because it includes three simultaneous
emissions of CO2 from coal burning accounts for the additional 65% carbon dioxide in the atmosphere, increasing greenhouse gases. To anyone 's books this means climate change and global warming. The pollution it causes has also led to acid rain in some areas. Although there are a lot of causes of acid rain, burning coal is a major contributor because it releases sulfur dioxide, and acid rain has higher than normal amounts of sulfuric and nitric acid. Newer coal plants, however, now emits 40% less CO2, according to the World Coal Institute.
Effects on the Environment: There are profound effects on the environment on account of an increase in our carbon footprints. Due to the rising temperatures and shifting precipitation patterns there have been changes in the growing patterns of plants which has resulted in indigenous vegetation moving to increasingly cooler climates. Sea levels are rising as the temperature of our planet increases and warmer water occupies more space than cooler water. These rising seas will not only erode shorelines and destroy ecosystems but also completely displace the coastal cities and towns. 3.
On their part, fossil fuels, such as coil, oil and natural gas are running out and in order for them to be restored, it would take a few thousands of years. These fossil fuel sources are finite and will someday be depleted. Another difference between fossil fuels and renewable energies is that the latter are clean sources of energy that have a low environmental impact. Fossil fuel energies on the other hand, contain high percentage of carbon and hydrocarbons that rise to the atmosphere and cause air pollution and global warming. It is said that even though there is no single solution to reverse or arrest global warming, the production of energy through renewable sources, such as water, emissions can be reduced and the concentration level of atmospheric CO2 stabilized.
In these potential conditions, the photogenerated holes are able to either directly oxidize the absorbed pollutants or oxidize the hydroxyl groups located at the TiO2 surface to form •OH radicals, whose redox potential is only slightly decreased (Fujishima et al., 2000). In addition, it is possible to increase the number of •OH radicals by adding into the photoreactor H2O2 or O3 which can be photolyzed by UV irradiation. During the heterogeneous photocatalytic process, the TiO2 catalyst can be utilized either under dispersed form (powder, aqueous suspension) or in thin film form (fixed TiO2 catalytic layer on solid support). However, a drawback of the dispersed form is the progressive formation of dark catalytic sludge, which diminishes the efficiency of UV irradiation and reduces the photoreactor performances. In contrast, for TiO2 films, there is no need to separate the catalytic particles at the end of the process, but the catalytic layer must be very stable and
Pollution Technology has increased a lot in the last century and this created inventions that changed the world as it was known the humans, but these inventions and the industry of these inventions did create new problems that humans never faced before. Because of this increase of pollution new problems came to humans, for example, human health problems such as heart problems, lung problems, and skin problems. One more bigger problem is the rise of the temperature because of the global warming which will increase the temperature in the earth’s atmosphere and then the temperature will start to melt the ice around the world which will increase the sea level and this will create a lot more bigger problems, and these are only some of the problems