Journal
ENVIRONMENTAL TECHNOLOGY
Volume 36, Issue 23, Pages 2919-2923Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/09593330.2014.941943
Keywords
ammonium removal; ion exchange; leachate; treatment; zeolite
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Funding
- National High-Tech R&D Program (863 Program) of China [2008AA06Z332]
- Wuhan Science and Technology Bureau, China [201060723313]
- Human Settlements and Environment Commission of Shenzhen Municipality
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Ammonium ion-exchange performance of the natural zeolite was investigated in both batch and column studies. The effects of zeolite dosage, contact time, stirring speed and pH on ammonium removal were investigated in batch experiments. The result showed that ammonium removal efficiency increased with an increase in zeolite dosage from 25 to 150g/L, and an increase in stirring speed from 200 to 250r/min. But further increase in zeolite dosage and stirring speed would result in an unpronounced increase of ammonium removal. The optimal pH for the removal of ammonium was found as 7.1. In the column studies, the effect of flow rate was investigated, and the total ammonium removal percentage during 180min operation time decreased with the flow rate though the ion-exchange capacity varied to a very small extent with the flow rate ranging from 4 to 9mL/min. The spent zeolite was regenerated by sodium chloride solution and the ammonia removal capacity of zeolite changed little or even increased after three regeneration cycles.
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