بهینه سازی فرایند انعقاد الکتریکی در کاهش بار آلی شیرابه، مطالعه موردی: شیرابه مرکز دفن کهریزک تهران

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده فنی و مهندسی، گروه مهندسی عمران، دانشگاه خوارزمی، تهران، ایران

چکیده

شیرابه حاصل از مراکز دفن حاوی ترکیبات پیچیده، مقاوم و سمی است که مستلزم تصفیه آن قبل از ورود به محیط‌زیست و آب‌های زیرزمینی می‌باشد. هدف از این مطالعه استفاده از فرایند انعقاد الکتریکی و بررسی اثر پارامترهای pH(4، 7 و 9)، دانسیته جریان الکتریکی (25/31، 37/97و 50/63 میلی‌آمپر بر سانتی‌متر مربع)، زمان انجام واکنش (15 تا 60 دقیقه) و فاصله الکترودها نسبت به یکدیگر (1، 2 و 4 سانتی‌متر) به‌عنوان متغیر جهت حذف COD، TDS و TSS از شیرابه مجتمع مدیریت پسماند آرادکوه واقع در کهریزک تهران می‌باشد. جهت انجام فرایند از یک مخزن با جنس پلکسی گلس حاوی سه الکترود آلومینیومی و یک منبع تغذیه جریان مستقیم استفاده شد. بهترین بازده حذف COD، TDS و TSS در 9=pH، دانسیته جریان 50.63 میلی‌آمپر بر سانتی‌متر مربع، زمان انجام واکنش 60 دقیقه و فاصله 2 سانتی‌متری الکترودها نسبت به یکدیگر رخ داد که به ترتیب 37/8، 34/3 و 40/2  درصد به دست آمد. همچنین میزان فلزات سنگین نظیر کرم، سرب، روی و آهن، در شیرابه خام و سپس بعد از تصفیه توسط فرایند انعقاد الکتریکی به‌وسیله دستگاه جذب اتمی اندازه‌گیری شد. نتایج نشان داد که میزان حذف هر یک از این فلزات به ترتیب به میزان 43/75، 41/43، 37/5 و 27/23 درصد می‌باشد. این مطالعه نشان داد فرایند انعقاد الکتریکی روشی مؤثر برای کاهش میزان بار آلی شیرابه جایگاه دفن مواد زائد شهری است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Optimization of Electrocoagulation for Reducing the Organic Load of Landfill Leachate: A Case Study of the Tehran Kahrizak Landfill

نویسندگان [English]

  • Haniyeh Mehrshad
  • Mohammad Delnavaz
Faculty of Engineering, Kharazmi University, Tehran, Iran
چکیده [English]

The leachate generated at municipal solid-waste landfills contains complex, recalcitrant, and potentially toxic constituents; therefore, it should be treated before discharge to the environment and groundwater. In this study, leachate samples were collected from the Aradkouh Waste Management Complex (Kahrizak, Tehran, Iran) and treated using an electrocoagulation (EC) process. The effects of initial pH (4, 7, and 9), current density (25.31, 37.97, and 50.63 mA/cm²), reaction time (15–60 min), and inter-electrode distance (1, 2, and 4 cm) were evaluated for the removal of chemical oxygen demand (COD), total dissolved solids (TDS), and total suspended solids (TSS). Experiments were conducted in a plexiglass batch reactor equipped with three aluminum electrodes and powered by a direct-current supply. Under the optimum conditions (pH 9, 50.63 mA/cm², 60 min, and 2 cm), removal efficiencies of COD, TDS, and TSS reached 37.8%, 34.3%, and 40.2%, respectively. In addition, concentrations of Cr, Pb, Zn, and Fe were determined in raw and treated leachate using atomic absorption spectrometry, with corresponding removal efficiencies of 43.75%, 41.43%, 37.50%, and 27.23%. Overall, the results indicate that electrocoagulation can serve as an effective pretreatment option for reducing the pollutant load of highly concentrated landfill leachate.

کلیدواژه‌ها [English]

  • Landfill Leachate
  • Electrocoagulation
  • Current Density
  • Aluminum Electrodes
  • Heavy Metals

مراجع

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نشریه مهندسی عمران امیرکبیر
دوره 57، شماره 10
دی 1404
صفحه 1789-1806

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