Advanced treatment of stabilized landfill leachate after biochemical process with hydrocalumite chloride (Ca/Al–Cl LDH)

• Ca/Al–Cl LDH can efficiently remove the organic matters in stabilized landfill leachate.
• The formation of Ca/Al–LDH have a greater beneficial to remove organics than the other reagents.
• The removal of fulvic acid-like compounds by Ca/Al–LDH was much better than humic acid-like ones.
• Ca/Al–LDH had a selectivity for the removal of compounds with more carboxylic groups.

This study investigated the effectiveness of Ca/Al–Cl LDH for the treatment of stabilized landfill leachate. Experiments were performed including different dosage of Ca/Al–Cl LDH and comparison with different reagents, such as CaCl2 and AlCl3. As a result, Ca/Al–Cl LDH efficiently removed organic matters in stabilized landfill leachate with the maximum removal (59.41% COD, 62.06% DOC and 70.56% UV254) at the dose of 30 g/L. According to UV254 and EEM, it is remarkable that the formation of Ca/Al–LDH has a greater beneficial to organic removal than other reagents, especially for fulvic acid-like and humic acid-like compounds. Moreover, the removal of fulvic acid-like compounds was much better than humic acid-like compounds. The previous compounds had more carboxylic groups, thus had a better removal selectivity.

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