Compariosn of two type of zeolit as biofilter alternatives to eliminate ammonia from recirculation rearing system of Rainbow trout
Document Type : Original Article
Authors
Department of Fisheries, Faculty of Natural Resources, Urmia University, Urmia
Abstract
Recentlly, use of zeolite is important for remove ammonia in water of Rainbow trout farming recirculating systems. Two types of clinoptilolite was selected, clinoptilolite sodicpotassic (Na, K) 2 3Al3 (Al, Si)2 Si13 O36 .12 (H2O) and clinoptilolite sodicpotassic calcic (Ca, Na, K)2 3Al3 (Al, Si)2 Si13 O36 .12(H2O) (With a purity of 85%). the CEC were measured And the removal efficiency of ammonia were compared. The aim of the study was to define recirculating system with a capacity of 20 tons of rainbow trout farming, How much of each type is necessary clinoptilolite And what kind of Grain size. There's this mine clinoptilolite in Semnan, Iran. CEC was measured by the falamfotometri. CEC for the sodicpotassic 164.7 and sodicpotassic calcic was 117.34 mEq / 100 g. Clinoptilolite particle size have plays an important role in the absorption rate of ammonia. When the particle size becomes smaller Particle surface area will be increase. CEC have not dependent on the particle size of clinoptilolite. Both types clinoptilolite were classified in Sizes less than 1 mm - 1 to 2 mm - 2 to 2.8 mm – 2.8 to 4 mm. Then the adsorbed amount of ammonia was compared. Temperature 22° C and pH=7.5 Attracted a 1g sodicpotassic1.533 mg ammonium and 1g sodicpotassic calcic Attracted 1.232 mg ammonium. Clinoptilolite without calcium showed moreabsorption rate.
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