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بررسی عملکرد غشای نانو-پلیمری تولید شده در حذف برخی کاتیون‌ها و نسبت جذب سدیم از زهاب کشاورزی | ||
| تحقیقات آب و خاک ایران | ||
| مقاله 15، دوره 49، شماره 2، خرداد و تیر 1397، صفحه 397-411 اصل مقاله (1.48 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ijswr.2017.234205.667686 | ||
| نویسندگان | ||
| سمیرا عشائری* 1؛ تیمور سهرابی2؛ علیرضا حسن اقلی3؛ شروین احمدی4 | ||
| 1دانشگاه تهران - پردیس کشاورزی و منابع طبیعی - گروه آبیاری و آبادانی | ||
| 2استاد گروه آبیاری و آبادانی -پردیس کشاورزی و منابع طبیعی- دانشگاه تهران | ||
| 3عضو هیئت علمی (دانشیار) مؤسسه تحقیقات فنی و مهندسی کشاورزی، سازمان تحقیقات، آموزش و ترویج کشاورزی، کرج، ایران | ||
| 4هیئت علمی پژوهشگاه پلیمر و پتروشیمی ایران - گروه پلاستیک | ||
| چکیده | ||
| حجم بالای زهابهای شور کشاورزی و ضرورت پرهیز از اثرات نامطلوب زیستمحیطی ناشی از تخلیه آنها به منابع پذیرنده، در کنار وقوع شرایط بحرانی کمبود آب در دسترس، برنامهریزی و اقدام جهت تخلیه اصولی و بهرهبرداری مجدد از این قبیل آبهای نامتعارف را ضروری میسازد. هدف از این تحقیق، بررسی عملکرد و کارایی یک غشای نانو-پلیمری تولید شده در سطح آزمایشگاهی، از نظر قابلیت آن در کاهش نسبت جذب سدیم (SAR) و کاتیونهای مرتبط در زهاب کشاورزی است. غشای نانو- پلیمری مورد نظر با ترکیب 80% پلیاتیلن با درجه فیلم و 20% پلیاولفین الاستومر تولید شد. جهت اجرای تحقیق، زهاب مورد نیاز از اراضی کشت و صنعت شمال خرمشهر تهیه شد و تأثیر شوری زهاب و نیز تراوایی غشا بر درصد حذف پارامترهای هدایت الکتریکی (EC)، کاتیون یک ظرفیتی سدیم (Na+)، مجموع کاتیونهای دو ظرفیتی کلسیم و منیزیم (Ca2++Mg2+) و نسبت جذب سدیم (SAR) مورد بررسی قرار گرفت. آزمایشها در پنج سطح رقت زهاب، مشتمل بر بدون رقیقسازی یا 0%، 20%، 40%، 60% و 80% رقیقسازی تعریف گردید. ارزیابی خصوصیات غشا نشان داد که غشا دارای متوسط شعاع منافذ 778/0 نانومتر و ضخامت 20 میکرومتر و تخلخل 42/36% است. توالی درصد حذف نمکها به صورت CaCl2>NaCl>Na2SO4 بود که نشاندهنده بار مثبت غشا است. بر اساس نتایج حاصل از آزمایشها با خوراک زهاب، میزان حذف Na+ و Ca2++Mg2+ زهاب در کلیه نسبت رقتها به ترتیب در دامنه 71/50%-76/39% و 95/40%-34/19% درصد تغییر مییافت. مقدار حذف EC و پارامتر SAR نیز به ترتیب برابر با 18/46%-10/37% و 38/36%-80/30% بود. در نهایت، عملکرد این غشای نانو-پلیمری با یک نمونه غشای تجاری موجود در بازار (غشای NF2، سپرو) مقایسه گردید. نتایج نشان داد که علیرغم تراوایی کمتر غشای تولیدی، درصد حذف EC توسط آن در کلیه نسبت رقتها از غشای تجاری بیشتر بود و غشاء جدید از این نظر، عملکرد بهتری را از خود نشان داد. | ||
| کلیدواژه‌ها | ||
| زهاب شور؛ غشاء؛ پلی اتیلن؛ نانوفیلتراسیون | ||
| عنوان مقاله [English] | ||
| Assessment of a fabricated Nano-polymeric membranes function on rejection of some cations and Sodium Absorption Ratio of an agricultural drainage water | ||
| نویسندگان [English] | ||
| Samira Ashaeri1؛ Teymor Sohrabi2؛ Alireza Hassanoghli3؛ Shervin Ahmadi4 | ||
| 1Department of Irrigation and remediation Engineering, College of agriculture & natural resource, University of Tehran, Iran | ||
| 2professor of Department of Irrigation and remediation Engineering, College of agriculture & natural resource, University of Tehran, Iran | ||
| 3Associate Professor of Agricultural Engineering Research Institute, Agricultural Research, Education and Extension Organization, Karaj, IRAN | ||
| 4Department of Plastic, Iran Polymer and Petrochemical Institute, Tehran, Iran | ||
| چکیده [English] | ||
| The huge volume of saline agricultural drainage water and necessity of avoiding it's undesirable environmental side effects which caused by discharge to water bodies, beside critical situation caused by shortage of water availability, necessitated of planning and proceeding to depletion and reuse of such marginal waters. The objective of this study was assessing and evaluation of a laboratory made nano-polymeric membrane in rejection of sodium absorption ratio (SAR) and ralated cations in agricultural drainage water. The Nano-polymeric membrane fabrication was performed by using % 80 polyethylenes with film grade (PE020) and %20 polyolefin elastomer (POE) polymeric composition. Natural agricultural drainage water was collected from Khorramshahr irrigation & drainage project located in Khuzestan province. In this experiment, the effect of feed agricultural drainage water salinity and membrane permeability on reduce of Electrical Conductivity (EC), SAR, Na monovalent cation and divalent cations of Ca2++Mg2+ was studied. Experiments defined in five dilution levels of drainage water (0, 0.2, 0.4, 0.6 and 0.8). The characterization of the membrane showed that mean pore radius was about 0.778 nm, the thickness about 20 (µm) and membrane porosity was 36.42%. Salt rejection sequence was: CaCl2>NaCl>Na2SO4 which showed that the membrane is positively charged. The rejection rate of Na+ and Ca2++Mg2+ of agricultural drainage water in all dilution levels were between 39.76-50.71% and 19.34-40.95%, respectively. The rejection rate of EC and SAR were changed between 37.10-46.18% and 30.80-36.38 %, respectively. Finally, the efficiency of this laboratory-made Nano-polymeric membrane was compared with a commercial membrane (NF2, Spero). Results showed that despite of lower permeability of PE membrane, its EC rejection rate was higher than commercial membrane in all dilution levels. | ||
| کلیدواژه‌ها [English] | ||
| Membrane, Nanofiltration, Polyethylene, Saline agricultural drainage water | ||
| مراجع | ||
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