Application of Chitosan and Activated Carbon Nano-composite in Removal of Nitrite, Phosphate, and Ammonia From Aquaculture Wastewater

Abstract

<jats:p>Developing an adsorbent with natural components is one of the effective methods to reduce the amount of wastewater pollutants. Wastewater reuse can improve the quality of water prior to entering the natural environment. The aim of this study was to evaluate the efficiency of chitosan nano-composite and activated carbon adsorbent in the removal of nitrite, phosphate, and ammonia pollutants from fish farms of Aq-Qala. To prepare the adsorbents, the shrimp shells were converted to nano-chitosan. The date palm kernel was prepared and activated with oxalic acid in pyrolysis furnace by injecting nitrogen gas into activated carbon, then, the nano-composite was prepared from nanochitosan and activated carbon. A field-laboratory study was conducted during the winter of 2018, and then, batches of synthesized nano-composite were investigated and the effects of pH, initial effluent concentration, and adsorption time were investigated. The experiments were performed in the pH range of 5-8, effluent concentration of 25-100 mg/L, and contact time of 15-90 minutes. The results showed that at optimum conditions (pH of 7, effluent concentration of 50 mg/L, and contact time of 60 minutes), the highest removal percentage and adsorption capacity for nitrite, phosphate, and ammonia contaminants were 99.98%, 99.77%, and 65.65%, and 6.65, 6.14, and 7.32 mg/g , respectively. Due to the high removal percentage (99.98%) of the chitosan and activated carbon nano-composite, the adsorbent was highly capable of removing pollutants (nitrite, phosphate, and ammonia).</jats:p>

Retracted: Advances in chitosan biopolymer composite materials: from bioengineering, wastewater treatment to agricultural applications

“…A rise in adsorption efficacy was found, with a rise in temperature and a reduction in pH. The pH of 1, at 50 °C, with a starting dye concentration of 50 mg l −1 and adsorbent amounts of 1500 mg l −1 , was found to have the best adsorption [75].…”

Effects of different water quality regulators on growth performance, immunologic function and domestic water quality of GIFT tilapia (Oreochromis niloticus, GIFT strain)

“…The results of research by Kim et al, showed that BS mainly promotes the decomposition of harmful substances in sediment or improves the micro ora of water body by producing a variety of enzymes, achieving the purpose of improving water quality (Kim et al). As a good biodegradability, chitosan can absorb many harmful substances, which is the great signi cance in promoting the decomposition of harmful substances in water (Rezaei et al, 2019). In this study, KMPS, THPS, BS and CS could reduce the increasing rate of ammonia nitrogen, PH, nitrite, active phosphate, total organic carbon (TOC) and chemical oxygen demand (COD) and the decreasing rate of dissolved oxygen (DO) content in GIFT tilapia growing environment, especially the effect of BS or CS is more signi cant.…”

Ammonia Bioremediation from Aquaculture Wastewater Effluents Using Arthrospira platensis NIOF17/003: Impact of Biodiesel Residue and Potential of Ammonia-Loaded Biomass as Rotifer Feed

“…However, toxic shock, pH changes, low dissolved oxygen, and cold temperatures in the winter can all impede this approach [ 12 ]. One of the most effective ways to decrease the amount of aquaculture wastewater contaminants is to develop an adsorbent that is a natural component [ 13 ].…”