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    • activated carbon, olive stone, sulphur, adsorption, mercury INTRODUCTION In recent years, Algeria has made considerable efforts to increase its agricultural production. The state policy focuses on agricultural subsidies such as interest-free credit and the planting of productive trees such as olive groves. Thanks to this policy, five million olive trees have been planted, producing 628 000 tons of olives per year. 25 % of this production is vegetable waste (olive stones),[1] which is traditionally used for combustion or is unused.[2] It would therefore be very interesting to valorize and to transform this waste to obtain new adsorbent materials that can be used to improve the quality of the environment by adsorbing pollutant compounds. Algeria is one of the world’s major exporters of natural gas (NG). This gas contains many undesirable elements that disrupt the operation of equipment including CO2, H2O, and heavy metals such as mercury.[3] In addition to its toxicity, mercury is highly corrosive to the metals with which it is in contact, forming amalgams. Aluminum alloys are among the most severely affected by this phenomenon.[4,5,6] For example, an explosion in 1973 at the Skikda liquefied natural gas plant in Algeria led to 27 fatalities and financial losses of $ 1 billion due to catastrophic failure of an aluminium heat exchanger through reaction with mercury contaminants. Mercury is a source of world contamination.[7] Worldwide mercury emissions from human activities are estimated to be 1000 to 60 000 t/year.[8] At gas industrial plants in Algeria, SONATRACH Company was obliged to install adsorption columns filled with activated (1)
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