The Effect of Zeolite and Nitrifying Bacteria on Remediation of Nitrogenous Wastewater Substances Derived fromCarp Breeding Farm

Abstract

Limitation of water resources and necessity in profitable production, and consequently<br />productivity enhancement has taken crop production by means of unconventional water into consideration. In<br />this study, the effect of different levels of zeolite and nitrifying bacteria were investigated on nitrogenous<br />compounds absorption in a closed system of carp breeding with alfalfa. Treatments of zeolites at three levels<br />(with a weight percent of 0, 5, and 10%) and bacterial treatments including two levels (without bacteria and<br />with nitrifying bacteria) were used for six weeks in such way that produced effluent of the carp breeding from<br />an experiment unit were entered to alfalfa culturing medium; so a closed cycle was established. The results of<br />this studyshowed that use of zeolite and nitrifying bacteria significantly decreased ammonia values in comparison<br />to the control in effluent, in addition, nitrate amount in treatments containing zeolite and bacteria were<br />significantly (P> 0.05) more than the control treatments. Dry weights of alfalfa in the treatments containing<br />zeolite and bacteria were more than the control treatments; additionally, use of bacteria was also significant on<br />dry weight of alfalfa (P> 0.05).This study showed that application of zeolite and nitrifying bacteria to soil,<br />conversion of ammonia to nitrate happens during nitrification that improves water quality of aquaculture and<br />causes more uptake of nitrate by plant that reduces water and soil pollution by this element.