تأثیر لجن فاضلاب و بیوچارهای حاصل از آن بر قابلیت استفاده و ویژگی‌های آزادشدن مس در یک خاک آهکی آلوده

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه علوم و مهندسی خاک، دانشکده کشاورزی، دانشگاه شهرکرد، شهرکرد، ایران

2 گروه علوم و مهندسی خاک، دانشکده کشاورزی، دانشگاه شهرکرد، شهرکرد، ایران

چکیده

هدف این پژوهش بررسی تأثیر سطوح مختلف لجن فاضلاب و همچنین بیوچار آن بر قابلیت استفاده و سینتیک آزاد­شدن مس در یک خاک آهکی آلوده به مس بود. برای این منظور لجن فاضلاب و بیوچار حاصل از آن در دو دمای تولید بیوچار شامل 400 و 600 درجه سلسیوس در سه سطح صفر، 5/0 و 1 درصد وزنی/وزنی به یک خاک آهکی آلوده به مس افزوده و به مدت 5 ماه خوابانده شدند. نمونه­های خاک به روش عصاره­گیری متوالی و با استفاده از عصاره­گیر دی ­تی ­پی آ (DTPA-TEA) در دوره­های زمانی 1 تا 504 ساعت عصاره­گیری شدند. نتایج نشان داد که تیمار لجن فاضلاب در هر دو سطح باعث افزایش معنی­دار (05/0p <) آزاد شدن مس نسبت به خاک شاهد شد، درحالی‌که مقدار مس آزادشده در تیمارهای بیوچار 400 و همچنین بیوچار 600 در هر دو سطح به طوری معنی­داری (05/0p <) نسبت به خاک شاهد کمتر بود. مقدار مس آزادشده در خاک تیمار شده با 1 درصد بیوچار 600 نسبت به خاک شاهد 2/54 درصد کاهش یافت. مقایسه ضرایب سرعت معادلات سینتیکی نشان داد که بیشترین و کمترین سرعت آزاد شدن مس به­ترتیب در تیمارهای 1 درصد لجن فاضلاب و 1 درصد بیوچار 600 بود. بطور کلی نتایج این تحقیق نشان داد که تبدیل لجن فاضلاب در یک دمای گرماکافت بهینه (در این مطالعه دمای 600 درجه سلسیوس) به بیوچار، علاوه بر اینکه راهکار مناسبی برای مدیریت لجن فاضلاب است، می­تواند در تثبیت مس و اصلاح خاک­های آلوده به مس نیز مفید باشد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

The Effect of Sewage Sludge and its Biochars on the Availability and Desorption Characteristics of Copper in a Contaminated Calcareous Soil

نویسندگان [English]

  • morteza shirmohammadi 1
  • ALI REZA HOSSEINPUR 1
  • Hamidreza Motaghian 2
1 Department of Soil Science, Faculty of Agriculture, Shahrekord University, Shahrekord, Iran
2 Department of Soil Science, Factulty of Agriculture, Shahrekord University, Shahrekord, Iran
چکیده [English]

The aim of this study was to investigate the effect of different levels of sewage sludge and its biochars on availability and release kinetics of Cu in a contaminated calcareous soil. For this purpose, the sewage sludge and its biochars produced at two temperatures including 400 and 600 0C were added to a contaminated calcareous soil at 0, 0.5 and 1% levels (w/w), and samples were incubated for 5 months. The kinetics of Curelease was determined by successive extraction with DTPA-TEA in periods of 1 to 504 h in the amended and control soils. Results showed that the desorbed Cu from the soils treated with 0.5 and 1% sewage sludge significantly increased (p < 0.05) as compared to the control soil, whereas, the amount of Cu desorbed from soils treated with 0.5 and 1% biochar produced at 400 and 600 0C significantly decreased (p < 0.05), as compared with the control soil. Desorbed Copper from treated soil with 1% biochar produced at 600 0C was reduced 54.2% as compared to the control soil. The comparsion of release rate constants indicated that the highest and lowest desorption rate of Cu were observwd in 1% sewage sludge and 1% biochar produced at 600 0C treatments respectively. Overall, the results demonstrated that the conversion of sewage sludge to biochar is a suitable method for its management and it can be used for stabilization and remediation of Cu contaminated soils.

کلیدواژه‌ها [English]

  • DTPA-TEA
  • Release Kinetics
  • Biochar
  • Pyrolysis temperatures
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