The percentage reduction in TAN concentration in
100-mL solutions held on a rotating shaker increased linearly with greater mordenite application rate, while
the amount of TAN removed per gram of mordenite (adsorptive efficiency) declined. At a TAN concentration of
200 mg L−1, both mordenite samples had an adsorption efficiency of about 8.7 mg TAN g−1. Ammonia removal
and adsorptive efficiency decreased with increasing salinity up to 30 g L−1. In aquarium tests with less vigorous
mixing,mordenite at concentrations equivalent to 10 to 500 kg ha−1 in ponds removed only 1 to 8% of TAN from
water. Mordenite and other zeolites are not useful for removing TAN from ponds. The New Zealand mordenite
was of good quality and like other zeolites could be used for other applications in aquaculture such as small,
intensively-stocked transport and holding units for aquatic animals,water recirculating culture systems, and possibly
as a feed additive.
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