Synthesis of Montmorillonite/Hematite as a Magnetic Nano-adsorbent for Ammonium Removal from Waste Leachate

Background and Objective: Human existence, biological species, and natural resources are all threatened by wastes. Poor waste management, in fact, can pollute the soil, water, and air. Furthermore, urban solid waste may clog sewers, collect stagnant water that breeds insects, and create flooding during wet seasons. Heavy wastewater, also known as landfill leachate (LL), can be produced as a result of precipitation, rainfall, and water flow from solid waste. LL may include a variety of pollutants, including heavy metals, ammonia, organic matter, and other hazardous compounds, depending on the kind and density of trash, the age and hydrology of the landfill, and the environment. The presence of ammonium in the aquatic environment causes dissolved oxygen depletion and eutrophication, as well as being hazardous to fish and people. The major purpose of this research is to use a novel nano-composite as an adsorbent to remove ammonium.Materials and Methods: The montmorillonite was rinsed ۳ times in deionized water and dried for ten hours at ۱۲۰°C. For the alteration of montmorillonite, waste material containing iron was used. Adsorption studies in ۲۵۰ mL Erlenmeyer flasks with a final capacity of ۱۰۰ mL were carried out. The central composite design (CCD) method was used to investigate the effect of different levels of operational parameters such as pH ۳, ۵, ۷, ۹, and ۱۱, amount of adsorbent ۰.۰۵, ۰.۱, ۰.۱۵, ۰.۲, and ۰.۲۵ g/L, blending speed ۷۵, ۱۰۰, ۱۲۵, ۱۵۰, and ۱۷۵ rpm, and contact time ۲۵, ۵۰, ۷۵, ۱۰۰, and ۱۲۵ min on ammonium adsorption rate.Results: Enhancing factors such as pH, adsorbent dose, blending speed, and contact time improved the efficacy of ammonium adsorption from LL. According to the findings of the CCD technique, the pH of ۸, adsorbent dose of ۰.۱۷ g/L, blending speed of ۱۱۷ rpm, and contact time of ۸۲ min were provided as ideal conditions. Furthermore, at optimal conditions, the effectiveness of ammonium adsorption from LL utilizing modified montmorillonite was ۹۰%.Conclusion: The interacting impacts of the factors had an increasing impact on the ammonium adsorption efficiency, it should be highlighted. As a consequence of the findings of this investigation, it can be inferred that modified montmorillonite has a high ammonium adsorption potential. This article was extracted from project NO. ۱۵۶۱۴, which was in accordance with the ethical principles and the national norms and standards for conducting medical research in Iran (approval ID: IR.SUMS.REC.۱۳۹۷.۷۶۵) and was supported by Shiraz University of Medical Sciences.

کلیدواژه ها:

Ammonium ، Landfill leachate ، Montmorillonite/hematite nano-composite ، Central composite design