امکان سنجی جذب سطحی نیترات توسط پوکه معدنی از محلول نیتراته در مقیاس آزمایشگاهی
محورهای موضوعی : سامانه های استحصال آب های نامتعارف
فرزاد بخشندگان مقدم
1
( گروه علوم و مهندسی آب، دانشکده کشاورزی، دانشگاه زنجان، زنجان، ایران.)
پریسا حسینی
2
(گروه علوم مهندسی آب، دانشکده کشاورزی، دانشگاه سراسری زنجان، زنجان، ایران)
کلید واژه: جذب سطحی, آلودگی آب, پومیس, محلول نیتراته,
چکیده مقاله :
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.
The surge in population and imprudent consumption of water resources have created many challenges in securing sufficient water for sustaining human life. To supply part of the water demand for agriculture, the reuse of gray water is recommended. However, many decontamination methods are cost-prohibitive and pose challenges in sludge disposal after purification. The purpose of this research is to evaluate the feasibility of nitrate absorption by a mineral pumice adsorbent from nitrate solutions. The present study was conducted as a two-factor factorial experiment and complete randomized design with three replications. The study involved sampling mineral pumice with diameters of 1 cm, and 5 cm and gradation ranging from 1 to 5 cm over 45 days. The samples were calibrated by spectrophotometric method at a wavelength of 470 nm. Results showed that mineral pumice influenced nitrate absorption from the solution. The amount of nitrate in the control treatment was 0.88 grams per liter on the first day. The highest absorption occurred on the 20th day for the 1 cm soil gradation, resulting in a decrease to 0.62 grams per liter, which indicated 0.36 grams per liter of nitrate absorption. Larger gradations, however, showed the highest absorption on the 30th day. The 5 cm treatments and 1-5 cm gradation showed a reduction (absorption) of 0.19 and 0.27 grams per liter of nitrate, respectively, compared to the control treatment. According to the results, mineral pumice, an economical resource, can be used to absorb nitrate from nitrate solutions. Moreover, the used mineral pumice could find applications as a soil texture modifier or fertilizer in various fields beyond nitrate absorption.
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