کاربرد جاذب زیستی جلبک Champia kotschyana Harvey برای حذف کادمیوم: مکانیسم ها و عوامل موثر
محورهای موضوعی : آلودگی خاک و آب با فلزات سنگین
مریم منتی
1
,
پروانه تیشه زن
2
,
عبدالرحیم هوشمند
3
,
مجید بغدادی
4
1 - گروه آبیاری و زهکشی، دانشکده مهندسی آب و محیط زیست، دانشگاه شهید چمران اهواز، اهواز،ایران
2 - گروه مهندسی محیط زیست، دانشکده مهندسی آب و محیط زیست،دانشگاه شهید چمران اهواز، اهواز ، ایران
3 - گروه آبیاری و زهکشی، دانشکده مهندسی آب و محیط زیست، دانشگاه شهید چمران اهواز، اهواز، ایران
4 - گروه آب و فاضلاب، دانشکده محیط زیست، دانشگاه تهران، تهران، ایران
کلید واژه: کادمیوم, جلبک, جذب سطحی, ایزوترم, سینتیک,
چکیده مقاله :
یکی از راه‌های جبران کمبود آب به خصوص در بخش کشاورزی، استفاده از آب‌های قابل بازیافت از جمله زه آب‌های کشاورزی، فاضلاب‌های خانگی و صنعتی است. از طرفی حذف آلاینده‌های موجود در این گونه آب‌ها از اهمیت ویژه ای برخوردار است. به دلیل هزینه بالا و راندمان کم سایر روش‌های حذف آلاینده، روش جذب زیستی با هزینه کم، راندمان خوبی برای حذف آلاینده‌ها از جمله کادمیوم را دارد. در این تحقیق جذب کادمیوم از محلول‌های آبی با استفاده از جلبک Champia kotschyana Harvey مورد مطالعه قرار گرفت. اثر متغیرهای موثر مانند غلظت یون‌های کادمیوم (5-5/0 میلی گرم در لیتر)، مقدار جاذب (7-1گرم در لیتر)، pH محلول (8-3) و زمان تماس (10-90 دقیقه) با روش سطح پاسخ مدل شد. طراحی باکس بنکن برای داده‌های تجربی استفاده شد و بهترین سطح متغیرهای مستقل یعنی غلظت اولیه یون کادمیوم، pH، زمان تماس و مقدار جاذب انتخاب شدند. در شرایط مناسب (4=pH، مقدار جاذب= 5/1 گرم در لیتر، زمان تماس= 53/36 دقیقه، غلظت اولیه کادمیوم=3/3 میلی گرم در لیتر) ظرفیت جذب و درصد حذف کادمیوم به ترتیب، 3/1میلی گرم بر گرم و 14/80 به دست آمد. مطالعات سینتیک و ایزوترم نشان داد که مدل سینتیک شبه مرتبه دوم و ایزوترم لانگمویر به خوبی با داده‌های جذب کادمیوم مطابقت دارند. بر طبق نتایج می‌توان از بیومس جلبک Champia K. Harvey برای جذب کادمیوم از محلول‌های آبی استفاده کرد.
One way to compensate for water shortages, especially in the agricultural sector, is to use recyclable water, including agricultural water, domestic and industrial wastewater. On the other hand, removing pollutants in these waters is particularly important. Due to the high cost and low efficiency of other pollutant removal methods, biological adsorption methods with low cost have good efficiency for removing pollutants, including cadmium. In this study, cadmium absorption in aqueous solutions was studied using Champia Kotschyana Harvey. Effect of effective variables such as concentration of cadmium ions (0.5-5 mg/L), absorbent value (7-1 gr/L), solution pH (3-8) and contact time (90-90 min) with model response level method became. The design of the Box- Behken was used for experimental data and the best level of independent variables, namely the initial concentration of cadmium ion, pH, contact time and adsorbent value, were selected. Under suitable conditions (pH=4, adsorbent value = 1.5 g/L, contact time = 36.53 min, cadmium initial concentration = 3.3 mg/L) adsorption capacity and cadmium removal percentage, respectively 3/1 mg/ g and 80/14 obtained. Kinetic and isotherm studies showed that the second-order Kinetic model and the isotherm Langmuir well corresponded to cadmium absorption data. According to the results, the Champia K. Harvey alga biomass can be used to adsorb cadmium from aqueous solutions.
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