جذب بیولوژیکی یون کادمیوم از محلول‌های آبی با استفاده از جلبک سندسموس (Scenedesmus sp.)

نوع مقاله: مقاله علمی - پژوهشی

نویسندگان

1 هیات علمی گروه محیط زیست دانشگاه علوم کشاورزی و منابع طبیعی گرگان

2 هیات علمی دانشگاه علوم کشاورزی و منابع طبیعی گرگان

3 دانشجوی کارشناسی ارشد دانشگاه علوم کشاورزی و منابع طبیعی گرگان

چکیده

به دلیل وجود فلزات سنگین در منابع آبی و معایب روش‌های معمول جهت حذف آنها، منجر به استفاده از روش های موثر برای حذف فلزات سنگین شده است. جذب بیولوژیکی فلزات سنگین با استفاده از میکروجلبک بعنوان یک روش مناسب مورد بررسی قرار گرفته است. جلبک سندسموس توانایی مناسبی برای رشد داخل پساب-ها دارد و کادمیوم حتی در غلظت های پایین سمی می باشد. لذا در این پژوهش، کارایی جلبک سبز سندسموس برای حذف کادمیوم از محلول‌های آبی مورد بررسی قرار گرفت. پس از رشد جلبک در محیط کشت Z8-N، جلبک زنده بعنوان بیو جاذب مورد استفاده قرار گرفت. دوزهای متفاوت(صفر، 25/0، 5/0، 75/0 و 1 گرم) به محلول های با غلظت های مختلف از کادمیوم (صفر، 5، 10، 20 و 50 میلی گرم بر لیتر) در زمان‌های مختلف (صفر، 30، 60، 120 و 180 دقیقه) ، به منظور بررسی جذب کادمیوم در شرایط ثابت ( 2±27 درجه سانتی‌گراد و pH برابر با 1/0±8/6) اضافه شد. با توجه به نتایج به‌دست آمده در این پژوهش، شرایط بهینه برای جذب کادمیوم توسط جلبک سندسموس در غلظت 10 میلی گرم بر لیتر (50/93 %)، در زمان تماس 60 دقیقه(80/90 %) و 1 گرم جاذب (50/93 %) اتفاق افتاد. بنابراین در مقایسه با سایر روش ها و جاذب ها ، کاربرد جلبک سندسموس برای حذف کادمیوم از محلول های آبی بسیار موثر بوده و می تواند جهت حذف فلزات سنگین از پساب های صنعتی به کار گرفته شود.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Biosorption of cadmium from aqueous solutions using Scenedesmus sp.

چکیده [English]

Due to the presence of heavy metals in the aquatic systems and disadvantages of the conventional techniques for the removal of them, lead to using of efficient methods for the removal of heavy metals. Biosorption of heavy metals using microalgae was considered as a suitable method. Scenedesmus sp. has suitable potential for the growing in the waste water and cadmium is more toxic even the low concentrations. So, In this study, efficiency of green algae Scenedesmus sp.was studied for the removal of cadmium from aqueous solutions. After growing of the algae in the Z8-N medium, live algae was used as absorbent. Different dosages (0, 0.25,0.5,0.75and 1) of algae were used for the different solutions (0,5,10,20 and 50 mg/L) at several contact times (0,30,60,120 and 180 Min.) to analysis of absorption of cadmium at the constant conditions (pH=6.8±0.1 and 27±2 ºC). According to the results of this study, optimum conditions of absorption of cadmium using Scenedesmus sp. Was conducted at a concentration of 10 mg/L (93.50%), contact time of 60 minutes (90.80%) and 1 gram absorbent (93.50%). Hence, comparing to other methods and absorbents, the application of Scenedesmus sp. for the removal of cadmium from aqueous solutions was very effective and it could be used for the removal of heavy metals from industrial effluents.

کلیدواژه‌ها [English]

  • Heavy metals
  • Environmental pollutions
  • Microalgae
  • Scenedesmus
  • Biosorption
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