Abstract
AbstractAmmonium is a nitrogen species that can directly enter a stormwater control measure (SCM) or be produced from degradation of organic nitrogen available in stormwater runoff. Clinoptilolite zeolite (ZT) and a hydrous aluminosilicate (CA) were investigated for ammonium removal use in filtration-based SCMs. Sorption capacity, kinetics, and strength of attachment were completed in batch settings. For the four different background electrolytes tested at neutral pH, ZT showed the highest uptake, particularly at 0.03 M NaCl, followed by 0.01 M CaCl2. The lowest uptake was found to occur for K+ electrolytes. Kinetics of ammonium uptake was also found to be more rapid for ZT (i.e., 30 min for ZT and 240 min for CA), and increase in concentrations of Ca2+ and K+ slowed the sorption process from 30 to 240 min. Extraction studies indicated high extractability of ammonium in ZT, while CA showed slightly smaller extractable ammonium; the results suggest that ammonium removed by CA is less exchangeable and possi...
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