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حذف فسفات، فلوراید و کلسیم از شیرابه دفن‌گاه زباله سراوان با استفاده از فرایند رسوب زیستی کلسیم کربنات | ||
| تحقیقات آب و خاک ایران | ||
| دوره 54، شماره 10، دی 1402، صفحه 1431-1445 اصل مقاله (1.54 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ijswr.2023.364169.669556 | ||
| نویسندگان | ||
| فاطمه مهدی پور1؛ نسرین قربان زاده2؛ محمدباقر فرهنگی* 2؛ مریم خلیلی راد1 | ||
| 1گروه علوم خاک، دانشکده علوم کشاورزی، دانشگاه گیلان، رشت، ایران. | ||
| 2گروه علوم خاک، دانشکده علوم کشاورزی، دانشگاه گیلان، رشت، ایران | ||
| چکیده | ||
| در سال‌های اخیر روش‌های دوست‌دار محیط‌زیست در مدیریت مواد شیمیایی خطرناک موجود در شیرابه مکان‌های دفن زباله به منظور جلوگیری از ورود آنها به منابع آب‌های سطحی و زیرزمینی موردتوجه قرار گرفته است. این پژوهش در سال 1401 در دانشگاه گیلان انجام شد. ابتدا یک باکتری اورئولیتیک با توانایی ترسیب کلسیم کربنات از شیرابه دفن‌گاه سراوان جداسازی شد. سپس پتانسیل آن در کنار باکتری شاخص اسپوروسارسینا پاستوری در حذف یون‌های فسفات، کلسیم و فلوراید از شیرابه در فرایند رسوب زیستی کلسیم کربنات (MICP) بررسی شد. آزمایش به‌صورت فاکتوریل 2×2×3 در قالب طرح کاملا تصادفی با سه تکرار (36 نمونه) اجرا شد. فاکتور‌ها شامل باکتری سیمان کننده در سه سطح (بدون مایه‌زنی، مایه‌زنی با سویه جدا شده از شیرابه و مایه‌زنی با اسپوروسارسینا پاستوری)، اوره در دو سطح (صفر و دو درصد) و کلسیم کلراید در دو سطح (صفر و 50 mM) به عنوان فاکتور سوم بودند. بیشترین درصد حذف فسفات (93 درصد) در تیمار بدون باکتری و اوره و در حضور کلسیم کلراید مشاهده شد. اما برای حذف فلوراید به حضور باکتری‌های اورئولیتیک نیاز بود به طوری‌که در تیمارهای دارای باکتری شاخص و جدا شده در حضور اوره و کلسیم کلراید به ترتیب 77 و 48 درصد فلوراید حذف شد که به ترتیب 4/14 و 9 برابر حذف فلوراید در تیمار شاهد بود. در تیمارهای دارای باکتری شاخص و جدا شده به ترتیب 93 و 90 درصد کلسیم شیرابه حذف شد. اگرچه درصد حذف فسفات، کلسیم و فلوراید در حضور باکتری شاخص نسبت به باکتری جدا شده بیشتر بود اما تفاوت چشم‌گیری بین آنها در حذف یون‌ها دیده نشد. بنابراین، با توجه به این‌که استفاده از ریزجانداران بومی، علاوه بر کاهش هزینه‌ها، نگرانی زیست محیطی بسیار کمتری را نیز نسبت به گونه‌های شاخص ایجاد می‌کنند، می‌توان از آنها برای حذف مواد خطرناک موجود در شیرابه در فرایند MICP استفاده کرد. | ||
| کلیدواژه‌ها | ||
| اسپوروسارسینا پاستئوری؛ اوره؛ ریزجانداران بومی؛ معدنی شدن زیستی | ||
| عنوان مقاله [English] | ||
| Phosphate, fluoride and calcium removal from Saravan landfill leachate using calcium carbonate bioprecipitation process | ||
| نویسندگان [English] | ||
| Fatemeh Mahdipour1؛ Nasrin Ghorbanzadeh2؛ Mohammad Bagher Farhangi2؛ Maryam Khalilirad1 | ||
| 1Department of Soil Science, Faculty of Agricultural Sciences, University of Guilan, Rasht, Iran | ||
| 2Department of Soil Science, Faculty of Agricultural Sciences, University of Guilan, Rasht, Iran. | ||
| چکیده [English] | ||
| In recent years, environmental friendly methods have been considered for managing hazardous chemicals in landfill leachates to prevent their entrance to surface and groundwater resources. This research was done in 2022 at University of Guilan. An ureolytic bacterium with the ability to precipitate calcium carbonate was isolated from the Saravan landfill leachate (SLL) firstly. Then, its potential was investigated along with the indicator bacteria Sporosarcina pasteurii in removing phosphate, calcium and fluoride ions from LLA through the calcium carbonate bioprecipitation process (MICP). The experiment was carried out as a 3 × 2 × 2 factorial in a completely randomized design with three replicates (36 samples). Factors include biocementing bacteria at three levels (no inoculation, inoculation with strain isolated from LLA and inoculation with S. pasteurii), urea at two levels (0 and 2% (v/v)), and calcium chloride at two levels (0 and 50 mM). The highest phosphate removal rate (93%) was observed in the presence of calcium chloride without bacteria inoculation, and urea addition. However, ureolytic bacteria were needed for fluoride removal where the treatments of indicator bacteria and isolated strain in the presence of urea and calcium chloride removed 77% and 48% of fluoride, which was 14.4 and 9 times greater than the control treatment, respectively. The calcium removal rate in treatments with indicator and isolated bacteria was 93% and 90%, respectively. Although the removal rate of phosphate, calcium and fluoride was higher in the presence of the indicator bacteria compared to the isolated strain, there was no significant difference between them. Therefore, considering the application of native microorganisms, in addition to reducing costs, also creates less environmental concern than the indicator bacteria, it can be used to remove hazardous chemicals from landfill leachates through the MICP process. | ||
| کلیدواژه‌ها [English] | ||
| Biomineralization, native microorganisms, Sporosarcina pasteurii, urea | ||
| مراجع | ||
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