کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4996556 1368271 2017 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The performance and evolution of bacterial community of activated sludge exposed to trimethoprim in a sequencing batch reactor
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تکنولوژی و شیمی فرآیندی
پیش نمایش صفحه اول مقاله
The performance and evolution of bacterial community of activated sludge exposed to trimethoprim in a sequencing batch reactor
چکیده انگلیسی


- Removal of chemical oxygen demand (88.6%), ammonia nitrogen (90.47%), and phosphorus (64.25%).
- Trimethoprim promotes the secretion of extracellular polymeric substances.
- Trimethoprim has a negative effect on microbial richness and diversity.
- Read numbers of functional bacteria change under trimethoprim pressure.

The performance and microbial community changes of an activated sludge sequencing batch reactor were evaluated after exposure to trimethoprim for 51 days. The average chemical oxygen demand, ammonia nitrogen, phosphorus efficiencies were 88.6% ± 0.56%, 90.47% ± 0.29% and 64.25% ± 1.12%, respectively. The protein and polysaccharide contents increased with increasing trimethoprim concentration to protect the cells from the unfavorable conditions. The chemical composition of extracellular polymeric substances increased. For denitrifying bacteria, the read numbers of Pseudomonas, Flavobacterium and Bacillus were both significantly increased from Day 1 to 25 and sharply decreased by Day 50 (p < 0.05), which is consistent with the tendency of Planctomyces (Anammox). The read number of Paracoccus displayed an increasing trend, whereas Nitrospirales, Nitrospira (nitrite oxidizer) and Nitrosomonadaceae (ammonia oxidizer) were significantly decreased (p < 0.05). The read number of Rhodocyclaceae (phosphorus oxidizer) was significantly decreased from Day 1 to 25 and sharply increased by Day 50 (p < 0.05).

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Bioresource Technology - Volume 244, Part 1, November 2017, Pages 872-879
نویسندگان
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