کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6464855 1422946 2018 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Treatment of acid mine drainage by forward osmosis: Heavy metal rejection and reverse flux of draw solution constituents
ترجمه فارسی عنوان
درمان زهکشی اسید معدن توسط اسمز معکوس: رها کردن فلزات سنگین و جریان معکوس از راه حل های رسم
کلمات کلیدی
اسمز معکوس زهاب معدن اسید، رد فلزات سنگین،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
چکیده انگلیسی


- Heavy metal rejection and water recovery from real AMD was studied in a FO process.
- When using NaCl as draw solution, rejection for tested metals exceeded 98%.
- When using NH4HCO3 as draw solution, ion backflow induced components precipitation.

Acid mine drainage (AMD) is one of the most relevant potential environmental liabilities of mining activities. They are formed when the excavated ore is exposed to rain and other natural erosion factors. This research evaluated the application of forward osmosis (FO) for the treatment of AMD. Rejection of several metals was determined, using a thin-film composite FO membrane, and two types of draw solutions: NaCl and NH4HCO3. When using NaCl as draw solution, results showed high levels of rejection, exceeding 97%. Individual rejections were Mg: 98.9%, Al: 99.8%, Si: 97.1%, Ca: 99.3%, Mn: 99.6%, Fe: 100%, Co: 99.4%, Cu: 98.9%, Zn: 99.5%. When using NH4HCO3 as draw solute, precipitates were observed over membrane surface, preventing normal operation. Results show that transport of ions from draw solution (Ammonia and bicarbonate) is the cause of such phenomenon. FO has the potential to become an alternative for the treatment of AMD, based on the high levels of rejection for metals provided by FO membranes. However, attention must be paid to the reverse flux of ions from the draw solution to the feed, especially when they can react with feed solutes.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Engineering Journal - Volume 332, 15 January 2018, Pages 85-91
نویسندگان
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