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A Brief Analysis of the Treatment Methods for Domestic Waste and Sewage

Release time:

2018-09-12

The hazards of landfills include: 1) Explosions and fires. Landfill-released gases consist of large amounts of CH4 and CO2. When the concentration of CH4 in the air reaches 5%–15%, it is easy to cause explosions. The landfill biogas explosion incident that occurred in Yangfang Town, Changping County, Beijing is a typical example. 2) Groundwater pollution. Volatile organic compounds and CO2 in landfill-released gases will dissolve into groundwater, breaking the original CO2 equilibrium pressure in the groundwater and promoting the dissolution of CaCO3, causing an increase in groundwater hardness. The escape of landfill gas in fully enclosed landfills will cause liner leakage, thus exacerbating the leakage of leachate.

The hazards of landfills include:

1) Explosions and fires. Landfill gas is composed of large amounts of CH4 and CO2. When the concentration of CH4 in the air reaches 5%～15%, it is easy to cause explosions. The landfill biogas explosion incident that occurred in Yangfang Town, Changping County, Beijing is a typical example.

2) Groundwater pollution. Volatile organic compounds and CO2 in landfill gas will dissolve into groundwater, disrupting the original equilibrium pressure of CO2 in groundwater, promoting the dissolution of CaCO3, and causing an increase in groundwater hardness. The escape of landfill gas in fully enclosed landfills will cause liner leakage, thus exacerbating the leaching of leachate and leading to groundwater pollution.

3) Exacerbates global warming. CH4 and CO2 are major greenhouse gases that produce a greenhouse effect, causing global warming. CH4 is 40 times more destructive to ozone than CO2 and produces a greenhouse effect more than 20 times higher than CO2, while the CH4 content in landfill gas reaches 40%～60%.

4) Leads to plant suffocation. Although CH4 does not have a direct physiological effect on vascular plants, it can reduce the oxygen level in the plant rhizosphere through direct gas displacement or through the consumption of oxygen by methanogenic bacteria, causing plant roots to die due to lack of oxygen. In addition, CH4 can also promote the formation of C2H4 under anaerobic conditions.

5) Landfill gas contains carcinogenic and teratogenic volatile organic gases, and its foul odor can cause discomfort to people.

Different garbage has different processing workshops. A system like a food chain is established by sorting the garbage processing workshops according to the nature of the garbage. Useful items should also be used where they are needed, and useless items should be converted into something very useful. For example, the heat generated from combustion is converted into electricity, and the emitted gases are classified and absorbed for use.

The above are some of the components of the processing framework. The following are the basics, necessary, and very important. That is, the attitude and common sense of rural people. If the source is not well handled, it will be time-consuming and laborious to implement. If the source is well resolved, it will be much easier. To better implement this, a concise regulation must be formulated, and it must be implemented forcefully. Relevant departments should also provide common sense issues and infrastructure in this regard.

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