Allowing for sustainable development

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When designing a plant, the concept of sustainable development means that one needs to consider not only its overall cost but also its nature:

  • more or less energy-consuming and production of greenhouse gases;
  • generating a minimum amount of waste (see costs generated by transport and disposal at a landfill site);
  • using a minimum amount of reagents (see contribution, through the production of reagents, to greenhouse gases and permanent waste);
  • generating re-usable by-products (sludge for agricultural application, creating new materials from ash, etc.).

All these considerations will not necessarily result in a single optimum system but, in this case, as already stated, overall cost resumes its primordial role.

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