The paper is very necessary in our society, but its production can affect our environment.
Felling of trees can be done in sustainable plantations or in protected areas, ecological criteria, or depleted. The manufacture of paper, in turn, can be done with a high energy, polluting rivers with chlorine, which affects the health of living organisms, including humans, bleaching or other means.
Recycled fibers require less water and energy to turn it into pulp, the fibers of fibers of a tree. To get higher quality paper, will require blending with virgin pulp because it is the recycled degraded.
Bleaching process.
To whiten the paper used in some cases, elemental chlorine, which pollutes, to form dioxins, which are very toxic to animals and to humans, if there is an overexposure or bioaccumulation. Alternatively, you can preblanquear bleaching with oxygen and leading to chlorine dioxide, with a result less polluting. This process is called ECF. Another alternative is to use hydrogen peroxide in the bleaching process, eliminating the use of chlorine, which is even cleaner. This process is called TCF.
The need of bleaching depends on the type of paper used. If the paper that is recycled is lower quality, as obtained from newsprint, will require more whitening, which is obtained if the paper of office
Felling of trees can be done in sustainable plantations or in protected areas, ecological criteria, or depleted. The manufacture of paper, in turn, can be done with a high energy, polluting rivers with chlorine, which affects the health of living organisms, including humans, bleaching or other means.
Recycled fibers require less water and energy to turn it into pulp, the fibers of fibers of a tree. To get higher quality paper, will require blending with virgin pulp because it is the recycled degraded.
Bleaching process.
To whiten the paper used in some cases, elemental chlorine, which pollutes, to form dioxins, which are very toxic to animals and to humans, if there is an overexposure or bioaccumulation. Alternatively, you can preblanquear bleaching with oxygen and leading to chlorine dioxide, with a result less polluting. This process is called ECF. Another alternative is to use hydrogen peroxide in the bleaching process, eliminating the use of chlorine, which is even cleaner. This process is called TCF.
The need of bleaching depends on the type of paper used. If the paper that is recycled is lower quality, as obtained from newsprint, will require more whitening, which is obtained if the paper of office
No hay comentarios:
Publicar un comentario