کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6310724 1618878 2013 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Evaluation of removal efficiency for acute toxicity and genotoxicity on zebrafish in anoxic-oxic process from selected municipal wastewater treatment plants
ترجمه فارسی عنوان
ارزیابی راندمان حذف برای سمیت حاد و سمیت ژنتیکی بر روی ماهی قزل آلا در فرایند آنکسایک-اکسیک از گیاهان تصفیه خانه فاضلاب منتخب
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
چکیده انگلیسی

The anoxic-oxic (A/O) process has been extensively applied for simultaneous removal of organic contaminants and nitrogen in wastewater treatment. However, very little is known about its ability to remove toxic materials. Municipal wastewater contains various kinds of pollutants, some of which have recalcitrant genotoxicity and may cause potential threat to environment, and even can lead to extinction of many species. In this study, we have selected three municipal wastewater treatment plants (WWTPs) employing anoxic-oxic (A/O) process to evaluate their ability to remove acute toxicity and genotoxicity of wastewater. Mortality rate of zebrafish (Danio rerio) was used to evaluate acute toxicity, while micronucleus (MN) and comet assays were used to detect genotoxicity. Results showed that in this process the acute toxicity was completely removed as the treatment proceeded along with decrease in chemical oxygen demand (COD) (<50 mg L−1) in the effluent. However, in these treatment processes the genotoxicity was not significantly reduced, but an increase in genotoxicity was observed. Both MN and comet assays showed similar results. The eliminated effluent may pose genotoxic threaten although its COD level has met the Chinese Sewage Discharge Standard. This study suggests that further treatment of the wastewater is required after the A/O process to remove the genotoxicity and minimize the ecotoxicological risk.

► Water quality of the effluents from A/O process met the standard to discharge. ► The acute toxicity was completely removed through the A/O process. ► The genotoxicity was not reduced, and even increased during the A/O process.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemosphere - Volume 90, Issue 11, March 2013, Pages 2662-2666
نویسندگان
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