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بهسازی هدایت هیدرولیکی خاک بستر خاکچالها با مواد طبیعی | ||
تحقیقات آب و خاک ایران | ||
مقاله 2، دوره 49، شماره 5، آذر و دی 1397، صفحه 965-975 اصل مقاله (788 K) | ||
نوع مقاله: مقاله پژوهشی | ||
شناسه دیجیتال (DOI): 10.22059/ijswr.2018.225261.667614 | ||
نویسندگان | ||
مسعود گراشی1؛ امین فلامکی* 2؛ مهناز اسکندری3؛ مهدی همایی4 | ||
1دانش آموخته کارشناسی ارشد، گروه مهندسی، دانشگاه پیام نور، تهران، ایران | ||
2دانشیار گروه مهندسی، دانشگاه پیام نور، تهران، ایران | ||
3استادیار پژوهش، موسسه تحقیقات خاک و آب، سازمان تحقیقات، آموزش و ترویج کشاورزی، کرج، ایران | ||
4استاد، گروه آبیاری و زهکشی، دانشکده کشاورزی، دانشگاه تربیت مدرس، تهران، ایران | ||
چکیده | ||
آلودگی خاک و سفرههای آب زیرزمینی بر اثر نفوذ شیرابه از محل دفن پسماندههای شهری، از چالشهای مهم مدیریت منابع آب و خاک میباشد. هدف از این پژوهش، ساخت آستری از مواد طبیعی موجود در محل دفن زباله بود که افزون بر نفوذپذیری مناسب، توانایی بیشتری در جذب آلایندهها نیز داشته باشد. دو ماده افزودنی طبیعی شامل بنتونیت و دیکلسیمفسفات، به ترتیب از صفر تا حداکثر 9 درصد و 2/0 درصد جرم خشک مواد پایه آستر به خاک درشتدانه جمعآوری شده از محل دفن شهر اوز در استان فارس، افزوده شد. آزمایش نفوذپذیری با آب و شیرابه مصنوعی انجام گرفت. نتایج نشان داد که برای مواد پایه حاوی 6 درصد بنتونیت، افزودن 2/0 درصد دیکلسیمفسفات باعث کاهش چشمگیرتر نفوذپذیری نسبت به بنتونیت بهتنهایی میشود. به دلیل گرانروی بیشتر، نفوذپذیری شیرابه مصنوعی در مواد پایه آستر و همچنین حاوی 3 درصد بنتونیت، نسبت به آب کمتر بود. لیکن در 6 درصد بنتونیت، به دلیل خاصیت اسیدی، نفوذپذیری شیرابه بیشتر شد. شیرابه مصنوعی در 9 درصد بنتونیت تأثیر چندانی بر کاهش یا افزایش نفوذپذیری نداشت. علت این امر را میتوان افزایش چشمگیر ذرات ریزدانه رسی و درنتیجه افزایش خاصیت بافری خاک دانست. | ||
کلیدواژهها | ||
آستر خاکچال؛ اصلاحکننده طبیعی؛ نفوذپذیری | ||
مراجع | ||
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