The adsorption of methylene blue onto Mytilus Edulis shells and corn stalks was studied under various conditions such as concentration of adsorbate, adsorbent dosage and granulometry. Batch adsorption experiments were conducted and the result showed that the adsorption was dependent to granulometry and adsorbate concentration, but was partly dependent on the adsorbent dosage. It was rapid, stable and occurs in less than 60 minutes. The objectives of this work were to compare the process of adsorption of methylene blue with two types of absorbents (Mytilus Edulis shells and Corn stalks) and to use isotherms (Langmuir and Freundlich) for modeling adsorption process. Results showed that Mytilus Edulis shells and Corn stalks are suitable for the adsorption of methylene blue dye and could be used as a low cost effective adsorbent in the treatment of the industrial wastewater.