Coal is a combustible black or brownish-black sedimentary rock, formed as rock strata called coal seams. Coal is mostly carbon with variable amounts of other elements, chiefly hydrogen, sulfur, oxygen, and nitrogen. Coal is a type of fossil fuel, formed when dead plant matter decays into peat and is converted into coal by the heat and pressure of deep burial over millions of years. Vast deposits of coal originate in former wetlands called coal forests that covered much of the Earth's tropical land areas during the late Carboniferous (Pennsylvanian) and Permian times.
Sulfur (also spelled sulphur in British English) is a chemical element; it has symbol S and atomic number 16. It is abundant, multivalent and nonmetallic. Under normal conditions, sulfur atoms form cyclic octatomic molecules with the chemical formula S8. Elemental sulfur is a bright yellow, crystalline solid at room temperature.
Flue-gas desulfurization (FGD) is a set of technologies used to remove sulfur dioxide from exhaust flue gases of fossil-fuel power plants, and from the emissions of other sulfur oxide emitting processes such as waste incineration, petroleum refineries, cement and lime kilns.
A fossil fuel power station is a thermal power station which burns a fossil fuel, such as coal or natural gas, to produce electricity. Fossil fuel power stations have machinery to convert the heat energy of combustion into mechanical energy, which then operates an electrical generator. The prime mover may be a steam turbine, a gas turbine or, in small plants, a reciprocating gas engine. All plants use the energy extracted from the expansion of a hot gas, either steam or combustion gases. Although different energy conversion methods exist, all thermal power station conversion methods have their efficiency limited by the Carnot efficiency and therefore produce waste heat.
Acid gas is a particular typology of natural gas or any other gas mixture containing significant quantities of hydrogen sulfide (H2S), carbon dioxide (CO2), or similar acidic gases. A gas is determined to be acidic or not after it is mixed with water. The pH scale ranges from 0 to 14, anything above 7 is basic while anything below 7 is acidic. Water has a neutral pH of 7 so once a gas is mixed with water, if the resulting mixture has a pH of less than 7 that means it is an acidic gas.
The Claus process is the most significant gas desulfurizing process, recovering elemental sulfur from gaseous hydrogen sulfide. First patented in 1883 by the chemist Carl Friedrich Claus, the Claus process has become the industry standard.
Petroleum coke, abbreviated coke, pet coke or petcoke, is a final carbon-rich solid material that derives from oil refining, and is one type of the group of fuels referred to as cokes. Petcoke is the coke that, in particular, derives from a final cracking process—a thermo-based chemical engineering process that splits long chain hydrocarbons of petroleum into shorter chains—that takes place in units termed coker units. Stated succinctly, coke is the "carbonization product of high-boiling hydrocarbon fractions obtained in petroleum processing ". Petcoke is also produced in the production of synthetic crude oil (syncrude) from bitumen extracted from Canada's tar sands and from Venezuela's Orinoco oil sands.
Coal pollution mitigation, sometimes labeled as clean coal, is a series of systems and technologies that seek to mitigate health and environmental impact of burning coal for energy. Burning coal releases harmful substances, including mercury, lead, sulfur dioxide (SO2), nitrogen oxides (NOx), and carbon dioxide (CO2), contributing to air pollution, acid rain, and greenhouse gas emissions. Methods include flue-gas desulfurization, selective catalytic reduction, electrostatic precipitators, and fly ash reduction focusing on reducing the emissions of these harmful substances. These measures aim to reduce coal's impact on human health and the environment.
Iraq has a number of environmental issues.
Chemical terrorism is the form of terrorism that uses the toxic effects of chemicals to kill, injure, or otherwise adversely affect the interests of its targets. It can broadly be considered a form of chemical warfare.
The wet sulfuric acid process (WSA process) is a gas desulfurization process. After Danish company Haldor Topsoe introduced this technology in 1987, it has been recognized as a process for recovering sulfur from various process gases in the form of commercial quality sulfuric acid (H2SO4) with the simultaneous production of high-pressure steam. The WSA process can be applied in all industries where sulfur removal presents an issue.
This is a list of notable events relating to the environment in 2003. They relate to environmental law, conservation, environmentalism and environmental issues.
The persecution of Christians by the Islamic State involves the systematic mass murder of Christian minorities, within the regions of Iraq, Syria, Egypt and Libya controlled by the Islamic terrorist group Islamic State. Persecution of Christian minorities climaxed following the Syrian civil war and later by its spillover.
In early 2014, the jihadist group Islamic State of Iraq and the Levant captured extensive territory in Western Iraq in the Anbar campaign, while counter-offensives against it were mounted in Syria. Raqqa in Syria became its headquarters. The Wall Street Journal estimated that eight million people lived under its control in the two countries.
The Shirqat offensive, codenamed Operation Conquest or Operation Fatah, was an offensive against the positions of the Islamic State of Iraq and the Levant (ISIL) in and around the district of Al-Shirqat District to reach the city of Mosul.
On 15 May 2016, a team of ISIL bombers assaulted a natural-gas plant north of Baghdad, Iraq, killing at least 14 people, eight suicide bombers, injuring 27 troops and burning 20 workers.
The Battle of Mosul was a major military campaign launched by the Iraqi Government forces with allied militias, the Kurdistan Regional Government, and international forces to retake the city of Mosul from the Islamic State (ISIL), which had seized the city in June 2014. The battle at the time was the world's single largest military operation since the 2003 invasion of Iraq and was considered the toughest urban battle since World War II. The operation, dubbed Operation "We Are Coming, Nineveh", began on 16 October 2016, with forces besieging ISIL-controlled areas in the Nineveh Governorate surrounding Mosul, and continued with Iraqi troops and Peshmerga fighters engaging ISIL on three fronts outside Mosul, going from village to village in the surrounding area in the largest deployment of Iraqi troops since the 2003 invasion of Iraq.
The Hamam al-Alil massacre was the killing of at least 300 civilians in the town of Hamam al-Alil in Iraq's Nineveh Governorate by the Islamic State of Iraq and the Levant (ISIL) in late October and early November 2016. The event took place within a larger ongoing assault on the city of Mosul by a wide coalition of anti-ISIL forces, which managed to capture Hamam al-Alil on 7 November.
The following is a timeline of the Battle of Mosul (2016–17) between October and December 2016.
During the Battle of Mosul (2016–2017), numerous reports of human rights abuses surfaced against the various parties involved in the conflict. Up to 1.5 million civilians lived in the city, sparking concerns among various organizations of a large humanitarian crisis. Lise Grande, the United Nations' humanitarian coordinator in Iraq, stated, "In a worst-case scenario, we're literally looking at the single largest humanitarian operation in the world in 2016." Save the Children warned that massive civilian bloodshed was likely, unless safe routes were authorized to let civilians flee. The U.S. government has accused ISIL of using civilians as human shields.
