اثر دمای فرآیند بر فراپالایش غشایی ترکیبات قلیایی هیومیکی استخراج‌شده از زغال‌سنگ‌های نارس، عملکرد جداسازی غشا و درصد خلوص محصول نهایی هیومیک اسید

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانش‌آموخته کارشناسی ارشد مهندسی مکانیک بیوسیستم، گروه مهندسی فنی کشاورزی، پردیس ابوریحان، دانشگاه تهران

2 عضو هیئت علمی گروه گروه مهندسی فناوری صنایع غذایی، پردیس ابوریحان، دانشگاه تهران، پاکدشت، تهران، ایران

3 عضو هیئت علمی گروه مهندسی فنی کشاورزی، پردیس ابوریحان، دانشگاه تهران

4 عضو هیئت علمی گروه مهندسی فناوری صنایع غذایی، پردیس ابوریحان، دانشگاه تهران، پاکدشت، تهران، ایران

چکیده

جداسازی ترکیبات فولوات و ناخالصی­های غیرآلی از محلول­های قلیایی هیومیکی، به­دلیل تاثیر بر بهبود کیفیت و درصد خلوص محصول نهایی هیومیک اسید، از اهمیت بالایی برخوردار است. بدین منظور، در این پژوهش، از یک سامانه غشایی برای جداسازی ترکیبات فولوات از محلول­های هیوماتی حاصل­از استخراج قلیایی زغال­سنگ­های نارس، استفاده شده است. در این سامانه، از یک غشای پلیمری فراپالایه از جنس پلی­سولفون و با اندازه حفرات kDa 5 در یک ماژول قاب و صفحه­ای بهره گرفته شد. اثر دمای فرآیند (35، 45 و °C55) بر عملکرد غشا شامل شار تراوه فولوات، درصد گرفتگی و مقاومت­های غشا (RT و Rf)، مدل­های گرفتگی هرمیا، شاخص بلوکه­شدن (i) و مورفولوژی لایه­های گرفتگی ارزیابی گردید. نهایتا اثر دمای فرآیند بر درصد خلوص هیومیک اسیدهای فراپالایش­شده از ناتراوه­های هیومات با آزمون گراویمتری تعیین گردید. یافته­های این پژوهش نشان داد که با افزایش دما از 35 تا °C55، میزان شار تراوه فولوات %38 افزایش می­یابد. در اثر افزایش دمای فرآیند، رفتار دوگانه­ای در گرفتگی و مقاومت­های غشا مشاهده شد. براساس نتایج تئوری مدل­های گرفتگی هرمیا، مکانیسم­ گرفتگی تشکیل کیک در دمای °C35، غالب گرفتگی گزارش شد اما با افزایش دما به 45 و سپس °C55، مکانیسم گرفتگی میانی در فرآیند برقرار شد. نتایج شاخص بلوکه­شدن (i)، نشان داد که گرفتگی­های استاندارد و کامل منافذ غشا، در دماهای بالاتر، زودتر رخ می­دهند. همچنین، بررسی گرفتگی ریزساختارهای غشا توسط آنالیز SEM نشان داد که با افزایش دما، میزان کیک تشکیل­شده بروی سطح غشا حدود %61 کاهش می­یابد اما منافذ غشا با افزایش دما بلوکه می­شوند. نتایج آنالیز گراویمتری نیز نشان داد که بالاترین درصد خلوص هیومیک اسید (%26/92) از هیومات­های ناتراوه در دمای °C35 حاصل شد و با افزایش دما در سامانه غشایی، اثر معنی­داری بر درصد خلوص هیومیک اسید مشاهده نمی­شود.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Effect of Processing Temperature on Membrane Ultrafiltration of Lignite coals-derived Humic Alkaline Extracts, Membrane Performance and Humic Acid Purity

نویسندگان [English]

  • ehsan sarlaki 1
  • Ali sharif paghaleh 2
  • Mohammad Hossein Kianmehr 3
  • Hossein Mirsaeedghazi 4
1 M.Sc. graduated of Mechanical Engineering of Biosystems, Department of Agro-Technology Engineering, College of Abouraihan, University of Tehran
2 Associate Professor, Department of Food Technology Engineering, College of Abouraihan, University of Tehran, Pakdasht, Tehran, Iran
3 Professor, Department of Agro-Technology Engineering, College of Abouraihan, University of Tehran, Pakdasht, Tehran, Iran
4 Associate Professor,Department of Food Technology Engineering, College of Abouraihan, University of Tehran, Pakdasht, Tehran, Iran
چکیده [English]

Separation of inorganic materials and fulvate compounds from alkaline humate solutions is very important due to obtaining a better quality and more purified humic acid. For this reason, in this research a membrane separation system was used to separate fulvate compounds from humate solutions obtained from alkaline extraction of lignite coals (low rank coal). A hydrophilic ultrafilter membrane of polysulfone material with a pore size 5 kDa was employed using a plate and frame module. The effect of temperature (35, 45 and 55°C) on the membrane performance such as permeate flux of fulvates, fouling percentage, total membrane resistance and membrane resistance (RT and Rf), and morphology of membrane layers were investigated. Also, the influence of temperature on the humic acid purity obtained as retentate was determined using gravimetric analysis. The results of this work showed that by increasing the temperature from 35 to 55 °C, the value of permeate flux of fulvates was increased by 38%. Multiple behaviors were observed in the membrane fouling and resistances by increasing the temperature. The cake layer formation mechanism was obtained as dominant of fouling in 35°C temperature according to Hermia’s theoretical model results

کلیدواژه‌ها [English]

  • Membrane Separation
  • Fulvate Compounds
  • temperature
  • Purity
  • Humic Acid
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