بررسی اثر عوامل محیطی و هیدرولیکی بر میزان حذف فسفر زهاب کشاورزی توسط سنگ آهک

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی آب دانشکده علوم کشاورزی دانشگاه گیلان

2 هیات علمی / گروه مهندسی آب دانشکده علوم کشاورزی دانشگاه گیلان

3 هیات علمی/ گروه مهندسی آب دانشکده علوم کشاورزی دانشگاه گیلان

چکیده

با وجود افزایش جمعیت و حادتر شدن بحران کمبود آب در سال‌های اخیر، استفاده‌ مجدد از پساب‌ کشاورزی به عنوان یک راهکار مد نظر قرار‌ گرفته است. به دلیل وجود آلاینده‌های مختلف در پساب کشاورزی، توجه به مسائل زیست محیطی و اثر آن بر کیفیت محصولات اهمیت بسزایی دارد. فسفر یکی از آلاینده‌های پساب کشاورزی است که حد غیر مجاز آن باعث تخریب اکوسیستم آبزیان، کاهش کیفیت و خوراک‌وری منابع آبی می‌شود. در پژوهش حاضر، روند حذف فسفر توسط سنگ آهک و اثر برخی از عوامل مانند اندازه ذرات آهک، دما، pH بر میزان حذف فسفر و همچنین اثر هیدرولیک جریان بر ایزوترم جذب مورد بررسی قرار گرفت. در این راستا آزمایش‌های سینیتیک جذب سنگ آهک، استخراج ایزوترم جذب تحت معادله لانگمیر و فرندلیچ در مقیاس آزمایشگاهی و ساخت مدل فیزیکی کانال زهکش به منظور بررسی اثر هیدرولیک جریان بر ایزوترم جذب انجام شد. آزمایش سینتیک نشان داد که میزان حذف فسفر توسط سنگ آهک بعد از 30 ساعت ثابت شد. در دو اندازه سنگ آهک تفاوت معنی‌داری از نظر درصد حذف فسفر دیده نشد. تغییر pH از 2 به 6 منجر به کاهش درصد حذف فسفر گردید و افزایش آن از 6 تا 11 روند افزایشی درصد حذف را نشان داد. حد مطلوب pHبرای حذف فسفر برای سنگ آهک در حالت قلیایی به دست آمد. افزایش دما از 22 به 30 درجه سانتی‌گراد روند نزولی درصد حذف فسفر را در پی داشت به طوری‌که با هر یک درجه افزایش دما، حذف فسفر حدود 3 درصد کاهش یافت. بررسی ایزوترم، تطابق خوب معادله فرندلیچ را توسط سنگ آهک نشان داد. مقایسه آماری ایزوترم جذب و مدل فیزیکی، تفاوت معنی‌دار و بسنده نکردن به نتایج آزمایشگاهی را نشان داد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

investigating the effects of environmental and hydraulic factors on phosphorus removal of agricultural waste using limestone

نویسندگان [English]

  • Fereshteh Zadjanali choubari 1
  • Maryam Navabian 2
  • Majid Vazife doust 3
  • Mehdi Esmaeili Varaki 3
چکیده [English]

With regard to the increase in population rate and the acute water shortages within recent years, reuse of agricultural waste water has been considered as an approach to the solution. Phosphorus is one of the pollutants of the agricultural waste water, the too excess mount of which causes the degradation of aquatic ecosystems, reducing the quality of water resources and eutrophication.. In the present study, the trend of phosphorus removal through limestone and the effect of some such factors as particle size, temperature, and pH on phosphorus removal as well as the effect of hydraulics of flow on the adsorption isotherm were studied. In this respect, the absorption kinetics experiments on limestone mining Langmuir and Freundlich adsorption isotherm equation as based upon laboratory scale and physical model of drain channel were performed at the University of Guilan in dimensions of 15×15×200 cm to investigate the effect of hydraulic flow drainage in two rates (0.05-0.1 Lit/s) on the adsorption isotherm. Kinetic experiments indicated that the rate of phosphorus removal through limestone was fixed after 30 hours. Between two size-ranges of limestone (0.5-1 and 3-5 mm), there was no significant difference observed in the percentage of phosphorus removal. The changes of pH showed that rate of phosphorus removal decreases in pH ranging from 2 to 6 while it increased in the pH range from 6 to 11. The optimal pH for phosphorus removal through limestone was obtained in alkaline conditions. Increasing the temperature from 22 to 30°C was followed by a downward trend of phosphorus removal. With regard to isotherm experiments, the Freundlich equation, as through limestone, showed close agreement. Within the physical model of the drainage canal, lower flow rates; showed better results regarding the extent of phosphorus elimination. A statistical comparison of adsorption isotherm (under controlled conditions in laboratory) and the physical model of drainage canal, the experimental results showed a statistically significant level of phosphor us removal and while not being fully satisfied with this result when planning for the design of phosphor us removal basins .

کلیدواژه‌ها [English]

  • isotherm
  • Orthophosphate
  • pH
  • temperature
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