REMOVAL OF CA2+ AND MG2+ FROM PRODUCED WATER USING SERIGUELA RESIDUE (SPONDIAS PURPUREA L.) AS POTENTIAL BIOSORBENT

Produced Water (PW) represents a problematic residue for the petroleum industry because it is generated in high amounts and it presents varied chemical composition can be toxic to organisms. The presence of inorganic salts, as calcium and magnesium, classify the PW in terms of its total hardness (TH) and this characteristic is an indication of the capacity to scale formation in pipelines and equipment. Thus, the adsorption treatment has been highlighted as an alternative method, mainly due to its low cost, high selectivity, and application of biodegradable adsorbents. In this context, the objective of this work is to evaluate the removal of Ca2+ and Mg2+ from PW using seriguela seeds (SS) as potential biosorbent. This work characterizes SS by chemical composition, surface groups, PZC (PZC) and SEM. The adsorption tests in batch resulted in levels of efficiency and TH adsorption capacity of 25 % and 8 mg g-1.