کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4483198 1316880 2011 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Influence of operational parameters on nitrogen removal efficiency and microbial communities in a full-scale activated sludge process
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
Influence of operational parameters on nitrogen removal efficiency and microbial communities in a full-scale activated sludge process
چکیده انگلیسی

To improve the efficiency of total nitrogen (TN) removal, solid retention time (SRT) and internal recycling ratio controls were selected as operating parameters in a full-scale activated sludge process treating high strength industrial wastewater. Increased biomass concentration via SRT control enhanced TN removal. Also, decreasing the internal recycling ratio restored the nitrification process, which had been inhibited by phenol shock loading. Therefore, physiological alteration of the bacterial populations by application of specific operational strategies may stabilize the activated sludge process. Additionally, two dominant ammonia oxidizing bacteria (AOB) populations, Nitrosomonas europaea and Nitrosomonas nitrosa, were observed in all samples with no change in the community composition of AOB. In a nitrification tank, it was observed that the Nitrobacter populations consistently exceeded those of the Nitrospira within the nitrite oxidizing bacteria (NOB) community. Through using quantitative real-time PCR (qPCR), nirS, the nitrite reducing functional gene, was observed to predominate in the activated sludge of an anoxic tank, whereas there was the least amount of the narG gene, the nitrate reducing functional gene.


► SRT and internal recycling ratio were controlled to improve TN removal efficiency in a full-scale process.
► Increased biomass concentration via SRT control enhanced TN removal.
► Decreasing the internal recycling ratio restored nitrifier's activity which had been inhibited by phenol.
► Application of specific operational strategies could change the physiological state of the bacterial populations.
► Proper operational strategies should be tailored to accommodate specific circumstances.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Water Research - Volume 45, Issue 17, 1 November 2011, Pages 5785–5795
نویسندگان
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