بررسی کارایی حذف فسفات از زهاب صنایع کشت و صنعت نیشکر با استفاده از سیستم تالاب بافل‌دار ساختگی با جریان زیر سطحی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی دکترا، گروه مهندسی عمران- مهندسی و مدیریت منابع آب، واحد شوشتر، دانشگاه آزاد اسلامی، شوشتر، ایران

2 استادیار گروه مهندسی عمران - مهندسی و مدیریت منابع آب، واحد شوشتر، دانشگاه آزاد اسلامی، شوشتر، ایران

3 استاد دانشکده مهندسی علوم آب، دانشگاه شهید چمران اهواز

10.22093/wwj.2019.164326.2798

چکیده

فسفر در محیط‌های آبی به‌عنوان یک ماده مغذی ضروری شناخته می‌شود اما افزایش غلظت آن در منابع آبی باعث بروز پدیده یوتریفیکاسیون در آب و در نتیجه مرگ آبزیان می‌شود. بنابراین حذف فسفات از آب بسیار مهم است. در این پژوهش به‌منظور حذف فسفات از منابع آب از سیستم تالاب بافل‌دار ساختگی با جریان زیر سطحی استفاده شد. در همین راستا برای افزایش کارایی سیستم تالاب ساخته شده در حذف بهینه فسفات، آزمایش‌هایی در 3 فاز مختلف طراحی شد. در فاز اول در قالب آزمایش‌های ناپیوسته، عملکرد کامپوزیت مواد ارزان قیمتی همچون زئولیت، بنتونیت و سنگدانه پامیس به‌صورت تثبیت نانوذرات زئولیت/ بنتونیت بر روی سطح سنگدانه‌های پامیس به‌منظور جذب فسفات و انتخاب کاندید برتر به‌منظور قرارگیری در بستر تالاب مورد بررسی قرار گرفت. در فاز دوم در قالب آزمایش‌های گلدانی، عملکرد گیاهان بومی استان خوزستان همچون سالیکورنیا، لویی و سازو به‌منظور جذب فسفات و انتخاب کاندید برتر جهت کشت در بستر تالاب مورد بررسی قرار گرفت و در نهایت در فاز سوم با قرارگیری بستر و گیاه منتخب در سیستم تالاب ساخته شده، آزمایش‌هایی به‌منظور بررسی اثر پارامترهایی همچون درصد ترکیب بهینه بستر منتخب با شن، زمان ماند هیدرولیکی و تغییرات دمایی بر راندمان حذف فسفات انجام و تحلیل شد. از بین مواد جاذب و گیاهان کاندید شده برای قرارگیری و کشت در بستر تالاب، بیشترین ظرفیت جذب و انباشت فسفات در سنگدانه‌های پامیس پوشش داده شده نانوذرات زئولیت 02/1 میلی‌گرم بر گرم و گیاه سالیکورنیا (68/9 میلی گرم در گرم وزن خشک گیاه) مشاهده شد. در این آزمایش استفاده از ترکیب 10 درصد بستر منتخب با 90 درصد شن به‌عنوان بهترین و اقتصادی‌ترین گزینه در حذف فسفات به‌دست آمد. همچنین راندمان حذف فسفات در زمان ماند هیدرولیکی 1 روزه در بیشترین شدت، 60/99 درصد به‌دست آمد و به‌عنوان زمان ماند بهینه مناسب برای حذف فسفات انتخاب شد. در نهایت بررسی نتایج اثر تغییرات دمایی در کارایی سیستم تالاب نشان داد که راندمان حذف از اسفندماه 1396 (دمای 20 درجه سلسیوس) تا تیرماه 1397 (دمای 40 درجه سلسیوس) به میزان 1 درصد افزایش یافت که نشان‌دهنده تأثیر تغییرات دمایی بر کارایی سیستم تالاب است. با توجه به نتایج به‌دست آمده در صورت در دسترس بودن زمین کافی، استفاده از سیستم‌های تالاب مصنوعی با جریان زیر سطحی برای تصفیه پساب واحدهای کشاورزی و صنعتی بسیار مناسب و مقرون به صرفه است.

کلیدواژه‌ها


عنوان مقاله [English]

Investigating the Efficiency of Phosphate Removal from Wastewater from Sugar Cultivation Industry Using Baffled Subsurface-Flow Constructed Wetland

نویسندگان [English]

  • Sadegh Ghasemi 1
  • Ehsan Dereikvand 2
  • Saeb Khoshnavaz 2
  • Saeed Boroomand Nasab 3
  • Mohsen Solimani Babarsad 2
1 PhD Candidate, Dept. of Civil Engineering- Water Resources Engineering and Management, Shoushtar Branch, Islamic Azad University, Shoushtar, Iran
2 Assist. Prof., Dept. of Civil Engineering- Water Resources Engineering and Management, Shoushtar Branch, Islamic Azad University, Shoushtar, Iran
3 Prof., Faculty of Water Science Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran
چکیده [English]

Phosphorus is recognized as a nutrient in aquatic environments, but increasing its concentration in water resources causes the occurrence of eutrophication in water and, as a result, causes the death of aquatic organisms. Therefore, removal of phosphate from water is very important. In this research, in order to remove phosphate from water resources, the baffled subsurface-flow constructed wetland was used. In order to increase the efficiency of the wetland system, experiments were designed in 3 different phases. In the first phase, in the form of batch experiments, the composite performance of cheap materials such as zeolite, bentonite and pumice aggregates (The stabilization of nanoparticles of zeolitebentonite on the surface of Pumice aggregates) to absorb phosphate and select the preferred candidate for placement in the wetland was investigated. In the second phase, in the form of pot experimentation, the performance of native plants of khuzestan province such as salicornia, Typha, and Juncus, In order to uptake phosphate and select the best candidate for cultivation in the bed of the wetland was investigated. Finally, in the third phase, with the placement of the selected bedding and plant (selected from previous experiments) in the wetland system, experiments were carried out to study the effect of parameters such as the percentage of optimum mix of Selected bed with gravel, hydraulic residence time and temperature changes on the phosphate removal efficiency. The results showed that among absorbent materials and candidate plants for placement and cultivation in the wetland, the maximum capacity to absorb and accumulate phosphate by Pumice aggregate coated by zeolite nanoparticles (1.08 mg/g) and salicornia (9.68 mg/g of plant dry weight) was observed. In this experiment, The use of a combination of 10% of the selected bed with 90% of the gravel was obtained as the best and most economical option for removal of phosphate. Also, the efficiency of removal of phosphate in the 1-day hydraulic residence time was achieved at the highest intensity (99.60%) and was selected as the optimum time to remove phosphate. Finally, the results of the effect of temperature changes on the efficiency of the wetland system showed that the removal efficiency from March 2018 (20 °C) to July 2018 (40 °C) increased to about 1 percent, which indicates the effect of temperature changes on the performance of the wetland system. According to the results, in the case of adequate land availability, the use of subsurface-flow constructed wetland systems to wastewater treatment of agricultural and industrial units is very convenient and cost-effective.

کلیدواژه‌ها [English]

  • Phosphate removal
  • Baffled Constructed Wetland
  • Phytoremediation

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