کارایی همبندکننده‌های مختلف در تثبیت و جامدسازی فلزات سنگین و مقاومت فشاری لجن کارخانه کاشی و سرامیک نیلوفر بیرجند

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی، دانشگاه بیرجند، بیرجند، ایران

2 دانشکده مهندسی علوم زمین، دانشگاه صنعتی اراک، اراک، ایران

چکیده

فلزات سنگین معمولا در غلظت­ های بالا، در فاضلاب صنایع یافت شده و با ورود به آب و خاک و زنجیره غذایی، اثرات سمی بر انسان و سایر جانداران خواهد گذاشت. روش تثبیت و جامدسازی در تصفیه لجن­ های حاوی فلزات سنگین کاربرد دارد. در این تحقیق، تثبیت و جامدسازی لجن صنایع کاشی و سرامیک، با کاربرد سیمان و افزودنی­ های آب، آهک، میکروسیلیس و خاک رس معمولی بررسی گردید.  در این تحقیق با استفاده از طراحی آزمایش­ ها به روش سطح پاسخ به بررسی اثر افزودنی ­های مختلف بر مقاومت فشاری نمونه و غلظت فلزات پس از آبشویی نمونه ­های تثبیت و جامد شده پرداخته شد. بدین ترتیب، میزان خطر زائدات پس از تثبیت و جامدسازی و نیز میزان تحمل نمونه­ ها در برابر بارهای محیطی ارزیابی گردید. طبق نتایج در مقادیر بالای سیمان، مقاومت فشاری بیشترین مقدار را داشته­ است. با کاهش مقدار پسماند و جایگزینی مقدار بیشتر آهک، رس و میکروسیلیس نیز مقاومت فشاری افزایش یافت. طوری­که در حالت بهینه، با 5/77% آهک، 8/69% رس،4/35% میکروسیلیس و 51/84% سیمان، مقاومت فشاری حداکثر حدود kg/cm2 116 بدست آمد. کمترین غلطت کروم در مقدار آهک 11/23%، رس 21/31%، میکروسیلیس 10/65% و سیمان 27/46% برابر با mg/L 0/0782بوده؛ و در مقدار آهک 11/23%، رس21/31%، میکروسیلیس 4/35% و سیمان 33/76% کمترین غلطت سرب (mg/L 0/0043) حاصل شد. بیشترین اثرگذاری همبندکننده­ ها در مقاومت فشاری مربوط به سیمان بوده ­است. همچنین کاربرد آهک، رس، میکروسیلیس و سیمان، کاهش موثر غلظت کروم و سرب در آبشویی نمونه­ های تثبیت شده، را نتیجه داد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Efficiency of various binders in solidification/stabilization of heavy metals and compressive strength in sludge of Ceramic tile factory Niloufar in Birjand

نویسندگان [English]

  • Mohamad Javad Zoqi 1
  • Mahdi Ayobi 1
  • Behnoosh Khataei 2
1 Assistant Professor, Department of Civil Engineering, Faculty of Engineering, University of Birjand, Birjand, Iran
2 Assistant professor-Department of Earth Sciences Engineering- Arak University of Technology-Arak-Iran
چکیده [English]

Solidification/stabilization (S/S) is a common process in the treatment of sludge containing heavy metals. In this study, S/S of ceramic tile industry sludge was investigated using cement and additives like water, lime, microsilica, and clay. By response surface methodology, the effect of different additives on compressive strength and metals concentration after the pollution leakage test was evaluated. Results showed the highest compressive strength in high amounts of cement. Decreasing the waste and replacing more lime, clay, and microsilica, the compressive strength increased. Under obtained optimum conditions, by 5.77% lime, 8.69% clay, 4.35% microsilica, and 51.84% cement, the maximum compressive strength was achieved at about 116 kg/cm2. The minimum concentration of Cr was 0.0782 mg/L and resulted from 11.23% lime, 21.31% clay, 10.65% microsilica and 27.46% cement. Minimum Pb concentration (0.0043 mg/L) was obtained in 11.23% lime, 21.31% clay, 4.35% microsilica and 33.76% cement. The more efficiency in compressive strength is related to cement. In addition, applying the binders concluded the effective reduction of Cr and Pb concentration in leaching the stabilized samples.

کلیدواژه‌ها [English]

  • Solidification/stabilization
  • Chromium
  • Lead
  • Portland cement
  • Industrial Sludge
  • RSM

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نشریه مهندسی عمران امیرکبیر
دوره 55، شماره 4
تیر 1402
صفحه 741-756

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