مقاله انگلیسی رایگان در مورد حذف فلزات سنگین از لجن فاضلاب – الزویر ۲۰۲۰

elsevier

 

مشخصات مقاله
ترجمه عنوان مقاله حذف فلزات سنگین از لجن فاضلاب تحت فرآیندهای شستشو  الکترواسمزی و اسید سیتریک
عنوان انگلیسی مقاله Heavy metal removal from sewage sludge under citric acid and electroosmotic leaching processes
انتشار مقاله سال ۲۰۲۰
تعداد صفحات مقاله انگلیسی ۳۵ صفحه
هزینه دانلود مقاله انگلیسی رایگان میباشد.
پایگاه داده نشریه الزویر
نوع نگارش مقاله
مقاله پژوهشی (Research Article)
مقاله بیس این مقاله بیس نمیباشد
نمایه (index) Scopus – Master Journals List – JCR
نوع مقاله ISI
فرمت مقاله انگلیسی  PDF
ایمپکت فاکتور(IF)
۵٫۳۲۹ در سال ۲۰۱۹
شاخص H_index ۱۴۴ در سال ۲۰۲۰
شاخص SJR ۱٫۱۵۸ در سال ۲۰۱۹
شناسه ISSN ۱۳۸۳-۵۸۶۶
شاخص Quartile (چارک) Q1 در سال ۲۰۱۹
مدل مفهومی ندارد
پرسشنامه ندارد
متغیر ندارد
رفرنس دارد
رشته های مرتبط مهندسی محیط زیست، شیمی
گرایش های مرتبط آلودگی های محیط زیست، مهندسی بهداشت محیط، آب و فاضلاب، شیمی محیط زیست
نوع ارائه مقاله
ژورنال
مجله  فناوری جداسازی و تصفیه – Separation and Purification Technology
دانشگاه  School of Environmental Science and Engineering, Tianjin University, Tianjin, China
کلمات کلیدی لجن، الکترواسمز، فلزات سنگین، اسیدی شدن، مشخصات فلزات سنگین
کلمات کلیدی انگلیسی sludge; electroosmosis; heavy metal; acidification; heavy metal speciation
شناسه دیجیتال – doi
https://doi.org/10.1016/j.seppur.2020.116822
کد محصول E14965
وضعیت ترجمه مقاله  ترجمه آماده این مقاله موجود نمیباشد. میتوانید از طریق دکمه پایین سفارش دهید.
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فهرست مطالب مقاله:
Abstract
Graphical abstract
۱٫ Introduction
۲٫ Materials and methods
۳٫ Results and discussion
۴٫ Conclusions
CRediT authorship contribution statement
Declaration of Competing Interest
Acknowledgements
References

بخشی از متن مقاله:
Abstract

The heavy metals present in sludge are very harmful to the environment and the human body. It is necessary to remove them before sludge disposal. In this study, an ex situ method for removing heavy metals from sludge using electroosmosis was designed, and experiments were conducted to study the effects of electroosmosis voltages (30 V, 40 V and 50 V), citric acid concentrations (0.03 mol/kg, 0.06 mol/kg, 0.09 mol/kg and 0.12 mol/kg) and the power supply (continuous and interrupted) on the removal rate of heavy metals (Cu, Cr, Cd, Zn and Pb). The study found that the combination of the citric acid pretreatment and electroosmosis can effectively improve the removal rate of heavy metals. An appropriate increase in the voltage and citric acid concentration can improve the removal rate of heavy metals. The best combination was determined to be 40 V and 0.09 mol/kg. Under these conditions, the removal rates of Cu, Cr, Cd, Zn and Pb, were 14.39%-41.28% (continuous power supply) and 21.78%-42.36% (interrupted power supply). The interrupted power supply effectively improved the removal rates of Cd and Zn but reduced the removal rates of Cr and Pb. The power supply mode had no significant effect on the removal rate of Cu. Heavy metal speciation was analyzed by the BCR method, and the relationship between the ratio of easily removed metal speciation and the removal rate was studied. The increase in the ratio of easily removed speciation was accompanied by an increase in the removal rate, indicating that citric acid and electroosmosis increased the removal rate by increasing the ratio of easily removed speciation. However, the high pH value around the cathode caused by the electrochemical reaction was not conducive to the removal of heavy metals.

Introduction

Sewage sludge, a byproduct of sewage treatment processes, is rich in nitrogen (N), phosphorus (P), potassium (K) and organic matter. It is a popular practice to dispose of sewage sludge via land use, and many countries currently use this method. However, it can be difficult to convince the government and land users to agree on this method because of the presence of toxic metals and bacteria in the sludge. Therefore, it is necessary to separate the heavy metals from the sludge [1,2]. The methods for the removal of heavy metals from sludge are chemical extraction, electrokinetic remediation, filtration, ion exchange, adsorption on activated carbon, membrane technologies, microbiological leaching, phytoremediation, etc. [3-9]. The electrokinetic process aims to remove the heavy metals using an electric field, which promotes several complex mechanisms such as electrodialysis electric migration, electrophoresis, and electrolysis. This approach is conducive to the transportation of pollutants [10,11]. These effects cause the heavy metals to concentrate around the cathode, which allows for their removal. The advantages of electrokinetic remediation are that it is simple (i.e., simple equipment), flexible (i.e., can be used for in situ or ex situ treatments), relatively inexpensive, effective and environmentally friendly [12,13].

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