Trash is currently one of humanity's most serious problems. Exaggerated consumerism combined with waste generates an enormous amount of waste. This is an extremely important subject and should be addressed in the classroom.
According to research conducted by the UN, humans annually produce 1,4 billion tonnes of urban solid waste (MSW) - an average of 1,2 kg per day per person. If the number looks scary, even bleak scenario was traced to ten years from now: 2,2 billion tons per year. If the current pace is maintained, by the middle of this century, we will have 9 billion and 4 billion tons of urban waste a year.
Dangers of slurry
One of the biggest risks for populations living near dumps is the decomposition of organic waste (usually food), which forms a dark liquid called leachate.
When in excess, this liquid can reach groundwater (groundwater) and contaminate well water and springs, making it difficult to supply drinking water in the affected region. Rains of rainwater can also carry this material to rivers and seas.
In addition, the slurry releases methane gas, which is very toxic and can cause cancer, nausea, dizziness, sleep and irritation in the nose and eyes. The composition of manure varies widely, but may contain heavy metals and microorganisms harmful to human health, especially for pregnant women. This is why it is necessary to keep people away from waste sites, encourage selective collection and invest in environmental education.
What to do with the trash?
Once accumulated by man, the garbage needs to undergo three actions: packaging, collection and final destination. Garbage packaging involves the participation of the entire community and requires special care. When done correctly, it makes the execution of the other phases easier, agile and economical.
A garbage collection is a task performed by professional urban cleaning workers who serve the community at pre-set and planned times.
After the collection, the last phase of the process begins: o treatment and final disposal of waste.
At this stage, except in cases where there is separation of recyclable waste, when other steps are completed earlier, the waste must be transported to special places (landfills). In them, the land is prepared to prevent the manure from entering the land and contaminating the water table. First the soil leveling is done and then it is covered with clay and PVC to waterproof the soil. The slurry is collected through pipes and sent to a treatment well and the garbage is covered daily in order not to be exposed and minimize its harmful action to man and the environment.
Bora teach all this to our children?
Polluting the different types of waste and the main sources of pollution, pointing out the problems caused, such as the different types of pollution: soil, water table, air, surface water and the proliferation of diseases, is an excellent way to address the subject matter.
It is interesting to teach the decomposition time of each object, so that the student is aware of the durability of each material in nature. It is also very important to learn to identify materials that can be used and transformed into pedagogical activity, for example.
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