پژوهش آب ایران

پژوهش آب ایران

ارزیابی اثربخشی و مخاطرات کاربرد لجن فاضلاب فرآوری‌شده در پرورش صیفی‌‌جات

نوع مقاله : مقاله پژوهشی

نویسندگان
1 استادیار و عضو هیات علمی مجتمع عالی آموزشی و پژوهشی اصفهان، پژوهشگاه نیرو، اصفهان، ایران.
2 شرکت آب و فاضلاب استان اصفهان
چکیده
این مطالعه به ارزیابی اثربخشی و مخاطرات کاربرد لجن خروجی تصفیه‌خانه‌ی فاضلاب بر پرورش صیفی‌جات، با تمرکز بر تأثیر آن روی ویژگی‌های خاک و عملکرد گیاه، می‌پردازد. برای این منظور، لجن خروجی تصفیه‌خانه‌ی فاضلاب شهر تیران در استان اصفهان برای کشت گلخانه‌ای سه محصول گوجه‌فرنگی، بادمجان و فلفل در سه مخلوط مختلف خاک و لجن خشک با نسبت‌های وزنی ۰، ۲۰ و ۴۰ درصد استفاده شد. نتایج نشان داد، کاربرد ۲۰ و ۴۰درصد وزنی لجن، سطح کربن آلی را به ترتیب ۱۲۸ و ۲۵۸درصد افزایش داد. همچنین، محتوای نیتروژن کل نیز به طور چشم‌گیری از ۰.۰۸ گرم‌برکیلوگرم (نمونه‌ی شاهد بدون لجن) به ۱.۸۲ گرم‌برکیلوگرم در تیمار حاوی ۴۰ درصد لجن افزایش یافت. غلظت فسفر قابل جذب با افزودن لجن از ۱۳ میلی‌گرم‌برکیلوگرم به ۳۴۰۰ میلی‌گرم‌برکیلوگرم رسید که پتانسیل آن را به عنوان منبعی غنی از مواد مغذی نشان می‌دهد. تجزیه و تحلیل آماری، تفاوت‌های معنی‌داری (ρ <0.005) را در پارامترهای رشد شامل ارتفاع گیاه و قطر ساقه با درصد لجن افزوده شده به خاک نشان داد. بر اساس نتایج این مطالعه، لجن فاضلاب فرآوری‌شده می‌تواند به طور مؤثری رشد سه گیاه منتخب را افزایش داده و حاصل‌خیزی خاک را در محدوده افزایش مجاز فلزات سنگین و عوامل بیماری‌زا، بهبود بخشد.
کلیدواژه‌ها
موضوعات

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  • تاریخ دریافت 19 تیر 1404
  • تاریخ پذیرش 04 مهر 1404
  • تاریخ انتشار 01 دی 1404