امکان سنجی جذب سطحی نیترات توسط پوکه معدنی از محلول نیتراته در مقیاس آزمایشگاهی
الموضوعات :فرزاد بخشندگان مقدم 1 , پریسا حسینی 2
1 - گروه علوم و مهندسی آب، دانشکده کشاورزی، دانشگاه زنجان، زنجان، ایران.
2 - گروه علوم مهندسی آب، دانشکده کشاورزی، دانشگاه سراسری زنجان، زنجان، ایران
الکلمات المفتاحية: جذب سطحی, آلودگی آب, پومیس, محلول نیتراته,
ملخص المقالة :
افزایش جمعیت و افـزايش مصرف غیر اصولی از منابع آبی، مشکلات بسیاری را در راستای تامین آب لازم جهت ادامه حیات بشری ایجاد نموده است. لذا جهت تامين بخشي از آب مورد نياز کشاورزی، استفاده مجدد از آبهای خاکستری توصیه میشود. اغلب روشهای رفع آلودگی به دلیل هزینه بالا و مشکلات دفع لجنهای تجمع یافته بعد از فرایند تصفیه سازی مقرون به صرفه نیستند. هدف از این پژوهش امکان سنجی جذب سطحی نیترات توسط جاذب پوکه معدنی از محلول نیتراته است. پژوهش حاضر به صورت آزمایش فاکتوریل دو عاملی در قالب طرح کامل تصادفی و در سه تکرار با نمونه برداری از پوکه معدنی با قطرهای 1 سانتیمتر، 5 سانتیمتر و دانه بندی 1 تا 5 سانتیمتر در 45 روز انجام شد. نمونه ها با روش اسپکتروفتومتری در طول موج 470 نانومتر واسنجی شدند. نتایج به دست آمده نشان داد که پوکه معدنی در جذب نیترات از محلول تاثیر داشته است. میزان نیترات تیمار شاهد 88/0 گرم در لیتر در روز اول بود. بیشترین جذب در روز بیستم برای دانه بندی 1 سانتیمتر مشاهده شد. بدین گونه که در پایان روز بیستم میزان نیترات به 62/0 گرم در لیتر کاهش یافت که این میزان بیانگر 36/0 گرم در لیتر جذب نیترات بود. ولی برای دانه بندی های بزرگتر روز سی ام بیشترین جذب را نشان داد. تیمارهای 5 سانتیمتر و دانه بندی 1- 5 سانتی متر به ترتیب کاهش (جذب) 19/0 و 27/0 گرم در لیتر نیترات را نسبت به تیمار شاهد نشان دادند. با توجه به نتایج به دست آمده می توان از این منبع ارزان قیمت برای جذب نیترات از محلول نیتراته استفاده کرد. پوکه معدنی مصرف شده، بعنوان اصلاح کننده بافت خاک یا کود، می تواند در سایر مزارع مورد استفاده قرار گیرد.
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