APPLICATION OF NATURAL ZEOLITES AND MACROPHYTES FOR WATER TREATMENTIN RECIRCULATION AQUACULTURE SYSTEMS
2015
Siracov I. | Velichkova K. | Stoyanova S. | Dinev D. | Staykov Y.
The macrophytes enrich the water with oxygen and help to remove nutrients. The zeolite is also a natural way to combat pollution. The aim of this study was to investigate the effectiveness in waste water treatment process in RAS, applying fi lter with natural zeolites and macrophytic plants from genus Lemna and Elodea. The temperature and pH were measured daily with a portable combined meter in the newly constructed control and experimental RAS. Ammonium, nitrite, nitrate, total nitrogen and phosphor us were measured spectrophotometrically. At the end of the trial the fi sh were weighed and specifi c growth rate and FCR (feed conversion ratio) were calculated. The addition of zeolite and macrophytic plants as a part of fi ltration system of experimental RAS, decreased signifi cantly the quantity of nitrogen and phosphorus compounds, compared to their amount in conventional one. The better water quality in experimental system, due to the presence in the fi lter of zeolites and macrophytic plants, infl uenced positively the growth of rainbow trout and feed utilization.
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