بررسی تأثیر غلظت جریان ورودی به ستون بستر ثابت بر روی حذف کادمیم توسط جاذب کنوکارپوس

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشگاه رازی کرمانشاه.

2 استادیار گروه مهندسی آب، دانشکده کشاورزی، دانشگاه رازی کرمانشاه.

3 دانشگاه علوم پژشکی، دانشکده بهداشت محیط، کرمانشاه

چکیده

حضور فلزات سنگین در محیط زیست به دلیل آثار مضر آن­ها بر سلامت انسان، بعنوان یک مشکل تلقی می­گردد. امروزه جاذب های گیاهی با عملکرد بالا برای تصفیه فاضلاب حاوی فلزات سنگین از جمله کادمیم توسعه یافته و نسبت به بقیه جاذب­ها  ارجحیت دارند. هدف از این مطالعه بررسی تأثیر تغییر غلظت جریان ورودی به ستون بر حذف کادمیم  بوسیله جاذب کنوکارپوس می­باشد. کنوکارپوس از مواد زائد گیاهی باغ­های شهر دهلران تهیه و ساختار ظاهری جاذب بررسی شد. در مطالعه حاضر تأثیر غلظت ورودی به ستون بر جذب کادمیم توسط جاذب کنوکارپوس بررسی و از دو مدل آدامز- بوهارت و توماس برای مدلسازی داده­های ستون جذب استفاده شد. نتایج بررسی خصوصیات ظاهری نشان داد که سطح جاذب دارای گودی‌های عمیق بوده و جاذب مورد مطالعه دارای ساختاری پیچیده، درهم، ناهموار و نامنظم می­باشد. نتایج بررسی منحنی­های شکست نشان داد که در غلظت­های بالاتر، شکست بستر در طی زمان کمتری اتفاق می افتد. با افزایش غلظت ورودی به ستون، منحنی­های شکست دارای شیب بیشتر شده و حجم شکست کاهش می­یابد. همچنین مدل آدامز- بوهارت دارای برازش بهتری از داده­های ستون جذب می­باشد.

کلیدواژه‌ها


عنوان مقاله [English]

Investigation of effect of influent concentration on cadmium removal in a fixed- bed column using adsorbent Conocarpus

نویسندگان [English]

  • Pejamn poormohammadi 1
  • Masoumeh Farasat 2
  • Behnam Farhadi
  • Meghdad Pirsaheb 3
1 razi university
2 Assistant professor, Department of Water Engineering, Razi University, Kermanshah
3 University of Medical Sciences, Faculty of Environmental Health, Kermanshah, Iran.
چکیده [English]

The presence of heavy metals in the environment due to their harmful effects on human health, regarded as a problem. Today, high-performance biosorbents for wastewater treatment containing heavy metals such as cadmium were developed and are preferable than other absorbents. The aim of this study was investigation of effect of influent concentration on cadmium removal in a fixed- bed column using adsorbent Conocarpus. Conocarpus was prepared from waste vegetable of DEHLORAN city gardens and surface structure of absorbent was investigated. In this study, the effect of influent concentration on cadmium removal wasinvestigatedand Adams- Bohart  and Thomas models were used to the column adsorption modeling. Physical characteristics results showed that the adsorbent has deep pores and complex, intricate, uneven and irregular surface of filamentary structure. The results of breakthrough curves review showed that in higher concentrations, breakthrough time of bed was decreased. breakthrough curves slope increased and breakthrough volume decreased with increasing initial cadmium concentration. Also Adams- Bohart  model has a better fit of the column data

کلیدواژه‌ها [English]

  • Cadmium
  • Conocarpus
  • Fixed- bed column
  • Modeling

 

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