Influence of Adding Clay in Removing Nitrate from Groundwater by Zerovalent Iron
DOI:
https://doi.org/10.21123/bsj.2024.10988Keywords:
Activated clay, Natural clay, Water pollution, Water treatment, Zero iron.Abstract
The method of removing nitrates from water using zero-valent metals is one of the methods that proves to be highly effective day after day, especially zero-valent iron. However, the most prominent obstacles that cause an obstacle to continuing its use are the exposure of its surface to passivation during the reaction and the production of ammonium ions as a main product for the reduction of nitrates under conditions of treatment.
In this research, the effect of clay during the removal of nitrate by Fe0 was studied. Raw clay, acid-activated clay, and clay modified with iron nanoparticles at a ratio of (1:1) were used. The results showed that 80% of nitrate ions in water can be removed by using Fe0 at a concentration of 40 g/L with 4 ≥ pH for 120 min at room temperature, adding raw clay reduced the efficiency due to its alkaline properties, which led to the inhibition reaction of Fe0 with nitrates. while Acid-activated clay led to an increase in nitrate removal by increasing dosage.
Modified clay has given greater effectiveness than raw clay and acid-activated clay, removal rate increased f to 95.33% under conditions of treatment, while ammonium was decreased with increasing the added clay in all its forms (raw, activated and modified). Finally, its noted that adding 5 gr/L of clay (raw, activated, modified) was sufficient to reduce the percentage of nitrate and ammonium within the permissible limits according to Syrian Specification No. 45/2007 for drinking water.
Received 19/02/2024
Revised 03/05/2024
Accepted 05/05/2024
Published Online First 20/11/2024
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