کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4409219 1307472 2013 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The selective role of nitrite in the PAO/GAO competition
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
پیش نمایش صفحه اول مقاله
The selective role of nitrite in the PAO/GAO competition
چکیده انگلیسی


• Combining EBPR-nitrite pathway with propionate as carbon source selects PAO vs GAO.
• Defluviicocus GAO are washed out using nitrite as sole electron acceptor.
• Nitrite is not a selection factor between PAOI and PAOII.

Proliferation of Glycogen Accumulating Organisms (GAOs) accounts as one of the major bottlenecks in biological phosphorus removal systems. GAO outcompeting polyphosphate accumulating organisms (PAOs) results in lower P-removal. Thus, finding optimal conditions that favour PAO in front of GAO is a current focus of research. This work shows how nitrite can provide a novel strategy for PAO enrichment. A propionate-fed GAO-enriched biomass (70% Defluviicoccus I, 18% Defluviicoccus II and 10% PAO) was subjected more than 50 d under anaerobic-anoxic conditions with nitrite as electron acceptor. These operational conditions led to a PAO-enriched sludge (85%) where GAO were washed out of the system (<10%), demonstrating the validity of the new approach for PAO enrichment. In addition, the presented suppression of Defluviicocus GAO with nitrite represents an add-on benefit to the nitrite-based systems since the proliferation of non-desirable GAO can be easily ruled out and added to the other benefits (i.e. lower aeration and COD requirements).

Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemosphere - Volume 93, Issue 4, October 2013, Pages 612–618
نویسندگان
, , , ,