Treatment of aquaculture waste effluent to be reused in fish culture in Egypt

Abstract

Keywords:Aquaculture Effluent Reused Environment Adsorbent TreatmentAquaculture is currently the largest source of fish supply in Egypt. However, with this great productivity there has been an obsession with liquid waste and its impact on the environment. The aim of the present work is to make a preliminary trial to evaluate the ability of some low cost materials (sawdust, sawdust ash, granite powder, and crushed granite) to improve the quality of waste effluents resulting from recirculation aquaculture systems, and selecting the most efficient adsorbent to be applied at three different levels to verify which level is the most probable for waste effluent to be reused in fish culture. Total dissolved solids (TDS), electric conductivity (EC), salinity, dissolved oxygen (DO), turbidity, florin (F), chlorine (CL), phosphate (PO 4 ), sulphate (SO 4 ), ammonium (HN 4 ), nitirate (NO 3 ), nitrite (NO 2 ) were the evaluating parameter. Results from the adsorption experiment showed that the crushed granite was a promising adsorbent for aquaculture wastewater treatment. Accordingly, the effect of using different doses (5g/L, 10g/L and 20g/L) of crushed granite on water quality parameters was assessed and surface characteristics of cracked granite were determined using FTIR spectrophotometer for surface functional groups identifications, and X-ray diffraction (XRD) for mineralogical composition and nitrogen absorption for surface porous structure and surface area. Results revealed that crushed granite composed mainly of quartz and that 10g/L of crushed granite is the most probable level to be used with waste effluents for recirculation aquaculture systems.

Toxic Impact of Exposure to Calcium Hypochlorite and Granular Activated Carbon on African Catfish (Clarias gariepinus): A Study of the Alterations in Hemato-Biochemical Profile and Oxidative Indices

“…Fish have a very close relationship with their surrounding environment, so poor water quality and waterborne toxicities most of the time kill-fish more than infectious agents (Roberts and Palmeiro 2008). So, it can be said that the ideal aquatic environment depends mainly on the water with high physicochemical quality (El-Sherbiny et al 2019).…”