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بررسی و مقایسه عملکرد آهک، سود سوزآور و خاکستر سودا در حذف فلزات سنگین مس و روی از پساب صنعتی با استفاده از فرآیند ترسیب شیمیایی | ||
| محیط شناسی | ||
| مقاله 4، دوره 50، شماره 1، خرداد 1403، صفحه 63-79 اصل مقاله (1.58 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/jes.2024.368775.1008459 | ||
| نویسندگان | ||
| مرتضی حاجی احمدی* 1؛ ناصر مهردادی2؛ غلامرضا نبی بیدهندی2 | ||
| 1گروه مهندسی محیط‌زیست، پردیس بین‌المللی ارس، دانشگاه تهران، جلفا، ایران | ||
| 2دانشکده محیط‌زیست، دانشگاه تهران، تهران، ایران | ||
| چکیده | ||
| در پژوهش حاضر روش ترسیب شیمیایی با استفاده از آهک، سود سوزآور و خاکستر سودا برای حذف فلزات سنگین مس و روی از پساب صنعتی معدن مس مورد بررسی قرار گرفت. آزمایش‌های جار توسط مجموعه‌ای از بشرهای پلی‌اتیلن (500 میلی‌لیتر) به منظور بررسی اثر دو پارامتر واکنش (دوزهای رسوب دهنده و pH اولیه) بر حذف فلزات سنگین انجام شد. آنالیزهای پراش اشعه ایکس (XRD) و میکروسکوپ الکترونی روبشی (SEM) مجهز به طیف‌سنجی پراش انرژی پرتو ایکس (EDX) به ترتیب برای شناسایی ترکیبات شیمیایی مهم در رسوبات و مطالعه مورفولوژی سطح و اندازه ذرات نمونه‌های لجن استفاده شدند. برای هر معرف، افزایش راندمان حدف مس و روی با افزایش دوز رسوب دهنده (400-10 میلی‌گرم در لیتر) مشاهده شد. نرخ حذف بالای 90 درصد برای هر دو فلز سنگین به دست آمد. راندمان ترسیب شیمیایی با pH تصفیه مرتبط بود. در سطوح pH نهایی بالا (10>pH>8)، مس راندمان حذف بالاتری توسط تمام عوامل رسوب دهنده نسبت به روی داشت. در لجن تولیدی، روی و مس به صورت هیدروکسیدهای آمورف شامل Zn(OH)2 و Cu(OH)2 رسوب داده شدند. تصاویر میکروسکوپ الکترونی روبشی (SEM) نشان داد که لجن‌های تولید شده دارای اندازه کوچک و ساختار فشرده هستند. آنالیز طیف‌سنجی پراش انرژی پرتو ایکس (EDX) مشخص کرد که در تمام لجن‌های بازیافتی، مقدار مس بیشتر از مقدار روی بوده است. تصفیه پساب با خاکستر سودا منجر به تولید لجن با حجم کمتر و اندازه ذرات بزرگ‌تر شد. در نتیجه، استفاده از این عامل رسوب دهنده می‌تواند برای مراحل خشک کردن لجن هزینه کمتری داشته باشد. | ||
| کلیدواژه‌ها | ||
| فاضلاب صنعتی؛ فلزات سنگین؛ ترسیب شیمیایی؛ لجن | ||
| عنوان مقاله [English] | ||
| Comparative Study on Cu and Zn Removal from Industrial Wastewater by Chemical Precipitation Using Lime, Caustic Soda and Soda Ash | ||
| نویسندگان [English] | ||
| Morteza Haji Ahmadi1؛ Nasser Mehrdadi2؛ Gholamreza Nabi Bidhendi2 | ||
| 1Department of Environmental Engineering, Aras International Campos, Jolfa, Iran | ||
| 2Faculty of Environment, University of Tehran, Tehran, Iran | ||
| چکیده [English] | ||
| The chemical precipitation using lime, caustic soda and soda ash was investigated for the simultaneous removal of Cu and Zn from copper mine industrial wastewater by conducting jar tests in the present study. Jar experiments were performed with a set of polyethylene beakers (500 ml) in order to investigate the effect of two reaction parameters (precipitant doses and initial pH) on the removal of heavy metals. X-ray Diffraction (XRD) and Scanning Electron Microscope (SEM) equipped with X-Ray Energy Diffraction Spectroscopy (EDX) were used to identify the important chemical compounds and to study the surface morphology, chemical composition and particle size of the sludge samples. An increase in the removal of Cu and Zn was observed by increasing the precipitant dose (10-400 mg/L) for each reagent used. Removal efficiency of 90% were obtained for both heavy metal ions. The chemical precipitation efficiency was affected by pH. At high final pH levels (8<pH<10), Cu had higher removal efficiency than Zn by all precipitating agents. In the sludge produced, Zn and Cu were precipitated as amorphous hydroxides including Zn(OH)2 and Cu(OH)2. SEM images showed that the produced sludges have small size and compact structure. EDX analysis determined that in all sludge samples, the content of Cu was higher than Zn. Effluent treatment with soda ash resulted in the sludge production with lower volume and larger particle size. As a result, the use of this precipitating agent can be less expensive for sludge drying steps. | ||
| کلیدواژه‌ها [English] | ||
| Industrial wastewater, Heavy metal, Chemical precipitation, Sludge | ||
| مراجع | ||
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