مطالعه کارایی حذف فلزات سرب و نیکل از پساب با استفاده از دو گونه گیاه لویی و علف هفت‌بند (مطالعه موردی: تصفیه‌خانه فاضلاب غرب اهواز)

نوع مقاله : مطالعه موردی

نویسندگان

1 گروه مهندسی محیط‌زیست، پردیس علوم و تحقیقات خوزستان، دانشگاه آزاد اسلامی، اهواز، ایران گروه مهندسی محیط زیست، واحد اهواز، دانشگاه آزاد اسلامی، اهواز، ایران

2 گروه خاک‌شناسی، واحد اهواز، دانشگاه آزاد اسلامی، اهواز، ایران

چکیده

با توجه به بحران کمبود آب استفاده مجدد از پساب شهری بسیار مهم و ضروری است. استفاده از گیاهان در فرایند تصفیه فاضلاب مناسب است و می‌تواند در کاهش و حذف آلودگی موجود در فاضلاب‌های شهری و روستایی کمک شایانی کند. این پژوهش در سال 1397 با هدف گیاه پالایی لویی و علف هفت‌بند در حذف فلزات سرب و نیکل از پساب تصفیه‌خانه شهر اهواز انجام شد. در این پژوهش از طرح کاملاً تصادفی در قالب 4 تیمار و 3 تکرار استفاده شد و مراحل فعالیت‌های آزمایشگاهی در آزمایشگاه خاک‌شناسی دانشگاه آزاد اسلامی واحد اهواز انجام شد. عناصر سنگین به روش جذب اتمی به کمک دستگاه PG Instruments Limited سنجش شدند. میانگین میزان سرب و نیکل در پساب شهر اهواز 35/96 و 57/102 میکروگرم در لیتر بود. میزان فلز سرب در تیمارهای بررسی شده در دامنه 85/17 تا 85/96 میکروگرم در لیتر و مقدار نیکل 91/18 تا 87/102 میکروگرم در لیتر به‌دست آمد. در این پژوهش در تیمار چهارم در زمان ماند 90، درصد حذف سرب و نیکل به وسیله گیاه لویی به‌ترتیب 66/62 و 18/70 درصد به دست آمد. همچنین کارایی حذف پارامترهای مورد بررسی به وسیله گیاه علف هفت‌بند نیز به‌ترتیب 26/29 و 22/44 درصد بود. مقدار جذب نیکل به‌وسیله گیاهان بالاتر از جذب فلز سرب بود. کارایی حذف فلزات سرب 66/62 و نیکل 18/70 از پساب شهری به‌وسیله گیاه لویی بیشتر از گیاه علف هفت‌بند به‌دست آمد. در مجموع گیاهان لویی و علف هفت‌بند توانایی گیاه پالایی فلزات سرب و نیکل را از پساب شهری داشتند، به‌طوری که مقدار این فلزات طی 90 روز زمان‌ماند در تیمار دوم و چهارم کاهش یافت.

کلیدواژه‌ها


عنوان مقاله [English]

Study of the Efficiency of Removal of Lead and Nickel Metals from Effluent Using Two Species of Latifolica and Polygonum Aviculare (Case Study: West Ahwaz Wastewater Treatment Plant)

نویسندگان [English]

  • Mahnaz Moteraghi 1
  • Khoshnaz Payandeh 2
1 Dept. of Environmental Engineering, Khuzestan Science and Research Branch, Islamic Azad University, Ahvaz, Iran Dept. of Environmental Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran
2 Dept. of Soil Science, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran
چکیده [English]

Due to the water shortage crisis, the reuse of municipal wastewater is essential. Planting plants in the wastewater treatment process is appropriate and can help to reduce and eliminate pollution in urban and rural wastewater. This study aimed to determine the phytoremediation of lead and nickel from Ahwaz wastewater treatment plant. In this study, a completely randomized design with 4 treatments and 3 replications was used, and the laboratory activities were performed in the soil laboratory of Islamic Azad University, Ahvaz Branch. Heavy metals were measured by atomic absorption method and PG Instruments Ltd. The average amount of lead and nickel in the effluent of Ahvaz was 96.35 and 102.57 μg/kg. The amount of lead metal in the studied treatments was 17.85-96.86 ppb, and nickel content was 18.91- 102.87 ppb. In this study, the percentage of the Lewis plant's removal of lead and nickel was 62.66% and 70.18%, respectively. Also, the removal efficiency of the studied parameters by the seven herbaceous plants was 29.26% and 44.22%, respectively. The amount of nickel adsorbed by plants was higher than that of lead metal. The removal efficiency of lead and nickel metals from municipal effluent obtained by Typha Latifolica was higher than Polygonum aviculare. In total, Typha Latifolica and Polygonum aviculare plants had the ability to purify lead and nickel metals from urban effluents so that the amounts of these metals were reduced in the second and fourth treatments within 90 days.

کلیدواژه‌ها [English]

  • nickel
  • Lead
  • Typha Latifolica
  • Polygonum Aviculare
  • Municipal wastewater
  • Wastewater Treatment Plant
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