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Natural gas is a gaseous fossil fuel mainly composed of methane. It mainly exists in oil fields and natural gas fields, with a small amount also found in coal seams. When non fossil organic matter undergoes anaerobic decay, it produces methane rich gas, which is called biogas. The sources of biogas include swamps between forests and grasslands, landfills, sludge in sewers, and manure, which are produced by anaerobic decomposition of bacteria. Biogas also includes gastrointestinal distension (such as farts), which most commonly comes from livestock such as cows and sheep. When methane escapes into the atmosphere, it will be a greenhouse gas that directly contributes to the worsening of global warming. This scattered methane will be regarded as a pollutant rather than a useful energy source. However, once methane in the atmosphere oxidizes with ozone, it becomes carbon dioxide and water, so the greenhouse effect caused by methane emissions is relatively short-lived. And in terms of combustion, natural gas produces much less carbon dioxide than coal and other Carboniferous fuels. The important biological sources of methane are termites, ruminants (such as cows and sheep), and human cultivation of land. It is estimated that the annual emissions of these three are 1
5, 75, and 100 million tons respectively (the total annual emissions are about 100 million tons).
A septic tank is a device that processes feces and filters and settles them.
. In rural areas, septic tanks usually adopt a three grid structure with a "eye" shape, and the three tanks are connected by manure pipes. Their respective functions are as follows: the first compartment is used for intercepting sediment and preliminary fermentation, the second compartment is used for secondary fermentation, and the third compartment is used for storing feces that have been basically harmless. When choosing the location of the septic tank, it should be ensured that it is far away from the main house to avoid odor issues. Prepare the necessary tools and materials for construction, such as bricks, cement, brick knives, ash boards, manure pipes, etc. After preparation, sprinkle lime lines at the determined positions, mark the size and shape of the septic tank, and then excavate a pit with a depth of about 1.2 meters. After excavating the soil pit, lay 5cm thick crushed stone as the bottom plate, and then pour a layer of 8cm thick 150 grade concrete. After the bottom plate is completed, brick the walls of the septic tank and pay attention to burying the manure pipes. When the wall is built to a certain height, apply cement and continue construction. When installing the manure pipe, the position should be at 1/3 of the effective depth, and ensure that the manure pipe from the first pool to the third pool has a downhill trend. After the wall is built, first use a 1:3 cement mortar as a base, and then use a 1:2 cement mortar for plastering, with a thickness of 1cm. After that, install the septic tank cover, usually using a 5cm thick reinforced concrete cover plate. After the cover plate is installed, the ground should be treated to make the septic tank 3 to 5cm above the ground to prevent rainwater from flowing in. The working principle of a septic tank is that fresh feces enter the first tank through the in
