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بررسی بهبود کیفی پساب درگذر از محیط‌های غیراشباع و اشباع در سیستم ذخیره-احیاء آبخوان (مقیاس آزمایشگاهی) | ||
| تحقیقات آب و خاک ایران | ||
| دوره 55، شماره 1، فروردین 1403، صفحه 131-143 اصل مقاله (1.16 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ijswr.2023.346883.669338 | ||
| نویسندگان | ||
| مرتضی موگویی1؛ مجید خلقی* 2؛ عبدالحسین هورفر3؛ عبدالمجید لیاقت4 | ||
| 1دانشجوی دکترا گروه مهندسی آبیاری و آبادانی، دانشکده کشاورزی دانشکدگان کشاورزی و منابع طبیعی دانشگاه تهران-کرج-ایران | ||
| 2استاد گروه مهندسی آبیاری و آبادانی دانشکده کشاورزی دانشکدگان کشاورزی و منابع طبیعی دانشگاه تهران-کرج-ایران | ||
| 3استاد گروه مهندسی آبیاری و آبادانی دانشکده کشاورزی دانشکدگان کشاورزی و منابع طبیعی دانشگاه تهران-کرج-ایران | ||
| 4استاد گروه مهندسی آبیاری و آبادانی دانشکده کشاورزی دانشکدگان کشاورزی و منابع طبیعی دانشگاه تهران | ||
| چکیده | ||
| افت تراز سطح آب زیرزمینی در اکثر آبخوان‌های کشور باعث وقوع مسئله محیطزیستی شده است. در این مسیر رویکرد ذخیره-احیاء آبخوان‌ها با استفاده از پساب می‌تواند راهکار مناسبی برای احیاء سفره‌های آب زیرزمینی بحرانی باشد. در این راستا، در این پژوهش برهم‌کنش پساب، خاک و آب آبخوان ازنظر کیفی، با عبور پساب از نواحی غیراشباع و اشباع مورد بررسی قرار گرفت. به این منظور، مدل آزمایشگاهی به شکل L، از جنس لولهPVC به قطر mm200 و طول m 15(5/2 متر قائم برای ناحیه غیراشباع و 5/12 متر افقی برای ناحیه اشباع)، ساخته شد. سپس در 12 نقطه در طول مسیر جریان، برخی از آلاینده‌های موجود در پساب به مدت 60 روز اندازه‌گیری شدند. نتایج نشان داد غلظت نیترات پس از طی مسافت 7متر به کمتر ازmg/L5/0 رسید و آلاینده‌های میکروبی(کلی فرم و اشریشیاکلی) پس از 6 متر در نمونه cc100 حذف شده‌اند. ازنظر شوری، پساب باعث بهبود کیفیت آب‌وخاک شد و هدایت الکتریکی آن از حدود 4 به 3/3 dS/m کاهش یافت. BOD و COD به ترتیب 81، 87 درصد کاهش داشتند. با توجه به بهبود کیفیت پساب درگذر از محیط‌های غیراشباع و اشباع، می‌توان سامانه ذخیره-احیاء را طوری اجرا کرد که پساب، ابتدا از محیط غیراشباع عبور کرده و سپس به آبخوان برسد. | ||
| کلیدواژه‌ها | ||
| پساب؛ غیراشباع؛ اشباع؛ ذخیره؛ آزمایشگاه | ||
| عنوان مقاله [English] | ||
| Treated wastewater quality improvement through the unsaturated and saturated zones in an aquifer storage and recovery system (laboratory scale) | ||
| نویسندگان [English] | ||
| Morteza Moogooei1؛ Majid Kholghi2؛ Abdolhossein Hoorfar3؛ Abdolmajid Liaghat4 | ||
| 1PhD Candidate, Department of Irrigation and Reclamation. Eng.Dept. -Faculty of Agriculture- Agricultural and Natural Resources Faculties-University of Tehran-Karaj-Iran | ||
| 2Irrigation and Reclamation Eng. Dept. -Faculty of Agriculture- Agricultural and Natural Resources Faculties-University of Tehran-Karaj-Iran | ||
| 3Irrigation and Reclamation Engineering Dept.-Faculty of Agriculture- Agricultural and Natural Resources Faculties-University of Tehran-Karaj-Iran | ||
| 4Irrigation and Reclamation Eng. Dept.-Faculty of Agriculture- Agricultural and Natural Resources Faculties-University of Tehran-Karaj-Iran | ||
| چکیده [English] | ||
| The groundwater level decline has caused an environmental issue in most of the Iranian aquifers. In this regard, aquifer storage and recovery (ASR) system can be used as a solution. On the other hand, the huge volume of treated wastewater in big cities can be used as a water source for aquifer storage purpose. In this study, the treated wastewater, soil and groundwater quality have been investigated through the unsaturated-saturated porous media. An experimental model, as L-shaped, has been designed using PVC pipe material with a diameter of 200 mm and a length of 15 m (2.5 m vertical and 12.5 m horizontal). The wastewater used in this research was obtained from the outlet of the sewage treatment plant in the south of Tehran. In order to avoid changes in the quality of wastewater during storage in the tank, it was tried to a regular change the treated wastewater in short intervals. After the initial investigations, a zone situated in center of in the Feshafuye plain, has been selected for treated wastewater injection. Then the required soil for laboratory setup has been collected for tis area. In this regard, firstly, the surface layer soil was removed, then the subsurface soil was transferred to the laboratory for the experimental setup. The required inflow water for this setup was taken from the aquifer of the same area and was changed regularly in order to establish the maximum real conditions. During this study, treated wastewater have been sampled and analyzed at 12 points along the flow path for 60 days. The results showed that the nitrate concentration decreased to less than 0.5 ppm after 7 m and microbial pollutants, total coliform and E. coli had been removed in a 100-cc sample after 6 m. In terms of salinity, the treated wastewater and soil quality have been improved from an EC of 4 to 3.3 dS/m. The BOD and COD have decreased by 81% and 87%, respectively. Due to improvement of treated wastewater quality through the unsaturated- saturated porous media, the ASR system can be implemented as a solution to prevent the groundwater level decline. | ||
| کلیدواژه‌ها [English] | ||
| wastewater, unsaturated, saturated, storage, laboratory | ||
| مراجع | ||
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آمار تعداد مشاهده مقاله: 39 تعداد دریافت فایل اصل مقاله: 23 |
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