کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8844012 1616301 2017 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Simultaneous nitrate and perchlorate removal from groundwater by heterotrophic-autotrophic sequential system
ترجمه فارسی عنوان
همزمان حذف نیترات و پرکلرات از آبهای زیرزمینی توسط سیستم ترتیبی هتروتروف و اتوتروفیک
کلمات کلیدی
کیفیت آب زیرزمینی، کاهش نیترات، کاهش پرکلرات، سیستم متوالی
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست علوم زیست محیطی (عمومی)
چکیده انگلیسی
Perchlorate is a naturally occurring and manufactured chemical anion and can be present in water sources together with nitrate. This study aims at (1) determining the nitrate and perchlorate contamination in a semi-arid plain (Harran Plain) and (2) evaluating the performance of a heterotrophic-autotrophic sequential denitrification process for nitrate and perchlorate removal from the groundwater of this plain. The nitrate in the groundwater samples varied between 4.07 and 83.22 mg l−1 NO3--N. Perchlorate was added to groundwater samples externally and its concentration was increased from 100 to 1500 μg l−1. The total nitrogen concentrations in the sequential system effluent throughout the study were always below 0.5 mg l−1. C/N ratio was 2.44 which was slightly lower than the theoretical level of 2.47. Therefore the average NO3−-N in the heterotrophic reactor effluent was 19 ± 3.7 mg l−1 corresponding to an efficiency of 75% reduction. The remaining nitrate and nitrite were almost completely reduced in the autotrophic process. The system's perchlorate removal efficiency was above 98%, except during the last period (82%), at which influent perchlorate was 1500 μg l−1. The maximum perchlorate reduction rate throughout the study was around 15 mg/(L.d). Both perchlorate and nitrate reduction were partial in the heterotrophic reactor, but completed in the following autotrophic process.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Biodeterioration & Biodegradation - Volume 116, January 2017, Pages 83-90
نویسندگان
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