اثر بخشی مورینگا پرگرینا در فراوری لجن کلرورفریکی تصفیه‌خانه آب

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار، گروه مهندسی آب و فاضلاب، دانشکده آب و محیط زیست، دانشگاه شهید بهشتی، تهران، ایران

2 کارشناسی ارشد مهندسی عمران-محیط زیست، دانشکده آب و محیط زیست، دانشگاه شهید بهشتی، تهران، ایران

چکیده

مدیریت لجن تصفیه‌خانه آب یکی از مشکلات اصلی شرکت‌های آب و فاضلاب است. دفع لجن فراوری شده توسط پلیمرهای شیمیایی با توجه به اثرات بهداشتی و محیطزیستی با محدودیت مواجه است. برای کاهش اثرات جانبی پلیمرهای شیمیایی، اخیراً استفاده از پلیمرهای طبیعی مورد بررسی قرار گرفته است. در این پژوهش، اثربخشی بذرهای گیاه مورینگا پرگرینا به‌عنوان پلیمر طبیعی در فراوری لجن تصفیه‌خانه آب مورد بررسی قرار گرفت. در این بررسی، نمونه‌های لجن از مخزن ته‌نشینی پولساتور تصفیه‌خانه آب تهرانپارس به‌صورت روزانه برداشت شد. فراوری لجن نمونه‌گیری شده با استفاده از آزمون جار  توسط پودر دانه‌های مورینگا پرگرینا در حالت محلول در آب نمک انجام شد. بهینه‌سازی سه عامل مهم در آزمون جار اعم از سرعت اختلاط، مدت‌زمان اختلاط و میزان دز بهینه با استفاده از طرح مرکب مرکزی، روش طراحی سطح پاسخ در نرم‌افزار Design Expert انجام شد. کمترین مقدار زمان موکش مویین و مقاومت ویژه در برابر فیلتراسیون به‌ترتیب برابر با 30/294 ثانیه و 6/19*1012 متر بر کیلوگرم تحت شرایط مطلوب حاصل شد. شرایط بهینه در سرعت و مدت‌زمان اختلاط 50 دور در دقیقه و 3 دقیقه، 250 دور در دقیقه و 100 ثانیه با مقدار دز بهینه  5040 میلی‌گرم در لیتر از مورینگا پرگرینا در فرم محلول در آب نمک و شاخص قابلیت اطمینان 000/1 حاصل شد. بهترین اثر بخشی مورینگا پرگرینا برای فرآوری لجن در محیط اسیدی حاصل شد. در شرایط عملیاتی بهینه،SRF و CST به‌ترتیب 75 و 42 درصد نسبت به شرایط اولیه لجن، کاهش یافت.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Efficiency of Moringa Pergerina to Sludge Conditioning in Ferric Chloride Water Treatment Plant

نویسندگان [English]

  • Mostafa Tizghadam 1
  • Abolghassem Alighardashi 1
  • Ramtin Mazaheri 2
1 Assist. Prof. of Water and Wastewater Engineering, Faculty of Civil, Water and Environmental Engineering, Shahid Beheshti University, Tehran, Iran
2 MSc of Civil and Environmental Engineering, Faculty of Civil, Water and Environmental Engineering, Shahid Beheshti University, Tehran, Iran
چکیده [English]

Water sludge management is one of the main problems facing water and wastewater companies. Disposal of conditioned sludge by chemical polymers is restricted due to the health and environmental effects. Recently, the use of natural polymers has been investigated to reduce the side effects of chemical polymers. In this study, the effectiveness of Moringa Pergerina seed as a natural polymer in the conditioning of water treatment sludge has been studied. In this study, sludge samples from the Tehranpars Water Treatment Plant were taken daily from the sedimentation tank. Sampled sludge conditioning was performed using jar test by Moringa pergerina powder dissolved in salt water (1N NaCl). Optimization of three important factors in the jar test, including mixing speed, mixing time and optimum dosage using the Box-Behnken Design, Response Surface Design Method (RSM), was performed in Design Expert software. Results: The minimum capillary suction time (CST) and specific resistance filtration (SRF) was obtained at 30.294 and 6.19×1012 m / kg respectively under optimal conditions. The results were obtained in terms of speed and time of mixing 50 rpm and 3 min, 250 rpm and 100 s with an optimal dosage of 5040 mg/L of Moringa Peegerina dissolved in salt water and a desirability index of 1.000. The best effectiveness of Moringa Pergerina for sludge conditioning was obtained in acidic media. Under optimal operating conditions, SRF and CST relative to the initial conditions of the sludge was reduced by 75% and 42%, respectively.

کلیدواژه‌ها [English]

  • Natural Conditioner
  • Response Surface Methodology
  • Sludge Processing
  • Water Management
  • Moringa Pergerina

مراجع

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