حذف فلز سنگین سرب از آب‌های آلوده به آن توسط فرآیند کریستالی‌شدن و بررسی پارامترهای موثر بر راندمان فرایند

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی شیمی و نفت، دانشگاه تبریز، تبریز، ایران

2 تبریز-مهندسی شیمی

3 دانشیار علوم و مهندسی پلیمر دانشکده مهندسی شیمی و نفت دانشگاه تبریز

چکیده

افزایش روز افزون جمعیت و صنعتی ‌شدن جوامع، باعث تولید مقادیر زیادی آلاینده معدنی، آلی و زیستی شده است. سرب یکی از فلزات سنگین است که دارای مسمومیت بالا و دراز ‌مدت، حتی در غلظت‌های کم است. روش‌های مختلفی از‌جمله ته‌نشینی، جذب ‌سطحی و فرآیندهای غشایی وجود دارند که هر یک دارای مزایا و معایبی هستند. نوع جدیدی از فرآیند ته‌نشینی با نام کریستالی‌شدن به‌ دلیل سادگی انجام فرآیند، ارزان ‌بودن مواد شیمیایی و همچنین پربازده ‌بودن مورد توجه قرار گرفته است. در این روش، محلول حاوی سرب به کمک عامل ته‌نشینی مانند محلول حاوی کربنات و در حضور ذرات دانه‌ای مانند ذرات شن و ماسه، به کریستال کربنات سرب تبدیل شده و بدین ترتیب فلز سرب از آب حذف می‌گردد. از جمله عوامل تاثیرگذار بر راندمان حذف در این روش می‌توان به pH، غلظت اولیه سرب، نسبت مولی کربنات به سرب و مقدار ذرات شن و ماسه اشاره نمود. نتایج حاصل از آزمایش‌های انجام شده نشان می‌دهد، زمانی که 8=pH، غلظت اولیه سرب 100 میلی گرم بر لیتر، نسبت مولی کربنات به سرب 3 به 1 و مقدار ذرات شن و ماسه 0/25 گرم در 100 میلی لیتر محلول باشد، میزان حذف سرب برابر با 99 % حاصل می‌شود.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Removal of Lead Heavy Metal from Wastewater by Crystallization Process and Investigation of the Effective Parameters

نویسندگان [English]

  • Parvaneh Khalati 1
  • Maryam Tahmasebpour 2
  • Seyed Jamaledin Peighambarsoust 3
1 Faculty of Chemical and Petroleum Engineering, University of Tabriz, Tabriz, Iran
2 تبریز-مهندسی شیمی
3 Associate Professor of Polymer Science and Engineeringو Faculty of Chemical & Petroleum Engineering, University of Tabriz
چکیده [English]

The increase in population and industrialization of societies have caused the production of large amounts of inorganic, organic, and biological pollutants. Lead is one of the heavy metals having high and long-term toxicity even at low concentrations which limits the reusability and recyclability of industrial wastewaters so it must be removed. In this study, the removal and recovery of Pb from synthetic wastewater by a new form of precipitation method named crystallization process in a batch system was investigated. This process has gained increasing attention in recent years because of accessibility, low cost, high efficiency, and no need to recover the used materials. The efficacy of removal was dependent on the factors such as pH, initial lead concentration, carbonate: lead molar ratio, and amount of seed crystals. The results of the experiments performed in this study showed that when the pH=8, the initial concentration of lead is 100 mg /L, the molar ratio of carbonate to lead is 3:1 and the amount of seed particles is 0.25 g dissolved in 100 ml, the lead removal efficiency is obtained as 99 %. The present study demonstrates that Pb can be successfully removed and recovered as PbCO3 crystals in a batch reactor.

کلیدواژه‌ها [English]

  • Water treatment
  • Heavy metals
  • Pb removal
  • Crystallization process
  • Parametric study

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نشریه مهندسی مکانیک امیرکبیر
دوره 53، شماره 11
بهمن 1400
صفحه 5349-5366

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