Simulation of Heavy Metals Adsorption Using Recycled Bentonite Clay Waste in a Fixed Bed Depth Column

  • سال انتشار: 1402
  • محل انتشار: فصلنامه بهداشت محیط و توسعه پایدار، دوره: 8، شماره: 3
  • کد COI اختصاصی: JR_JEHSD-8-3_008
  • زبان مقاله: انگلیسی
  • تعداد مشاهده: 94
دانلود فایل این مقاله

نویسندگان

Mukhtar DH. Abbas

Department of Environmental Engineering, Civil Engineering Faculty, Babol Noshirvani University of Technology, Iran & Engineer in Directorate of Al-Qadissiyeah Environment – Ministry of Environment, Iraq.

Daryoush Yousefi Kebria

Department of Environmental Engineering, Civil Engineering Faculty, Babol Noshirvani University of Technology, Iran.

چکیده

Introduction: The study objective is to remove heavy metals from an aqueous solution using recycled bentonite clay waste (RBCW) as a low-cost and green adsorbent in a continuous system. The produced RBCW results from thermal remediating of the hazardous industrial bentonite clay waste that is a by-product of used engine oil recycling plants. Materials and Methods: The doses of the RBCW adsorbent were (۱.۰, ۱.۵, and ۲.۰) g mixed with (۳۰, ۴۰, and ۵۰) g of the crystalline sand to produce bed depth columns of (۲۲, ۳۰, and ۳۸ cm), respectively. The influent concentrations of all adsorbates were (۲۰, ۵۰, and ۱۰۰) ppm, and the flow rates of the continuous system were (۰.۵, ۱.۰, and ۲.۰) mL/min. Results: The BET, XRF, and SEM tests and the experimental data approved that RBCW is active material for heavy metals adsorption. The adsorption capacity and breakthrough time of Pb, Cd, Cr, Zn, and Ni for dominant parameters (flow rate of ۱.۰ mL/min, adsorbent mass of ۱.۰ g, and influent concentration of heavy metals of ۲۰ ppm) were ۷۰.۳۶, ۳۶.۰۵, ۲۷.۵۵, ۲۱.۶۷, and ۱۸.۶۳ mg/g, and ۳۵, ۱۹.۷۳, ۱۱.۳۸, ۶.۲۵, and ۸.۱۳ hr, respectively. Conclusion: The RBCW adsorbent has more than one advantage in industrial and environmental issues. The (R۲) values for Thomas, Yoon-Nelson, and BDST models were higher than ۰.۹. Moreover, the breakthrough curves of experimental data were more fitted with the Yoon-Nelson model due to the high value of R۲ and low values of Chi-square, absolute average deviation, and standard deviation.

کلیدواژه ها

Adsorption, Sand, Metals, Heavy, Water, Permeability.

اطلاعات بیشتر در مورد COI

COI مخفف عبارت CIVILICA Object Identifier به معنی شناسه سیویلیکا برای اسناد است. COI کدی است که مطابق محل انتشار، به مقالات کنفرانسها و ژورنالهای داخل کشور به هنگام نمایه سازی بر روی پایگاه استنادی سیویلیکا اختصاص می یابد.

کد COI به مفهوم کد ملی اسناد نمایه شده در سیویلیکا است و کدی یکتا و ثابت است و به همین دلیل همواره قابلیت استناد و پیگیری دارد.