Adsorption mechanisms of high-levels of ammonium onto natural and NaCl-modified zeolites

By Lin Lin, Z. Lei, Li Wang, Xiang Liu, Yi Zhang, Chunli Wan, Duu-Jong Lee, J. Tay. 2013

303 citations recorded by the source corpus.

Abstract Zeolites, microporous aluminosilicate minerals, have high affinity to ammonium in water. This study explored the mechanisms of ammonium adsorption onto natural zeolite and NaCl-modified counterpart under different ammonium levels (10–4000 mg-N/L) and initial pH 3.4–11.1. Ion exchange dominated the ammonium adsorption process near neutral pH, with the order of exchange selectivity following Na +  > Ca 2+  > K +  > Mg 2+ . At high ammonium levels, Ca 2+ exceeded Na + as the dominant ions for ammonium adsorption. Conversely, in strong alkaline solutions, molecular adsorption suppressed ion exchange in ammonium adsorption. NaCl modification effectively increased ammonium adsorption capacity by increasing the Na contents in zeolite and by modifying the surface morphology to enhance film mass transfer rate. The modified zeolite presents a potential adsorbent to reduce ammonium concentration in landfill leachates, livestock wastewaters or effluents from anaerobic digestion tanks of livestock manure.

Subfields: Industrial and Manufacturing Engineering, Pollution, Water Science and Technology

View Paper: https://www.semanticscholar.org/paper/fef623e966c97da9778262ebb29ed3163cc8b4ec

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

  1. Hongbin Yin
  2. C. Valderrama
  3. M. Kong
  4. Diana Guaya
  5. J. Cortina
  6. A. Farran
  7. Chabaco Armijos

Citations in the corpus