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Water Res

Title:		Organic compounds evolution and sludge properties variation along partial nitritation and subsequent anammox processes treating reject water
Author(s):		Wang W; Xie H; Wang H; Xue H; Wang J; Zhou M; Dai X; Wang Y;
Address:		"State Key Laboratory of Pollution Control and Resources Reuse, Shanghai Institute of Pollution Control and Ecological Security, College of Environmental Science and Engineering, Tongji University, Siping Road, Shanghai 200092, PR China. State Key Laboratory of Pollution Control and Resources Reuse, Shanghai Institute of Pollution Control and Ecological Security, College of Environmental Science and Engineering, Tongji University, Siping Road, Shanghai 200092, PR China. Electronic address: yayi.wang@tongji.edu.cn"
Journal Title:		Water Res
Year:		2020
Volume:		20200716
Issue:
Page Number:		116197 -
DOI:		10.1016/j.watres.2020.116197
ISSN/ISBN:		1879-2448 (Electronic) 0043-1354 (Linking)
Abstract:		"Reject water contains complex components of organic compounds, which have significant influences on the nitrogen removal performance when treated using biological autotrophic nitrogen removal technology. In this study, a two-stage partial nitritation (PN)-anammox (floc-granule) system was established to treat reject water (COD/NH(4)(+)-N = 0.97 +/- 0.15), and the evolution of organic compounds along PN and annamox bioreactors was investigated using gas chromatography-mass spectrometry and excitation-emission matrix. Also, the variation of PN and anammox sludge properties relating to COD reduction was examined. The PN-anammox system removed approximately 80% of total inorganic nitrogen and COD with hydraulic reaction time of 16 h. The influent organics (330-600 mg COD/L) in reject water were primarily composed of volatile, protein-like and humic acid-like organic compounds. PN process contributed 53 +/- 18% of the overall COD removal, primarily including oxygen-containing organics (e.g. phenol), proteins and humic acids. Anammox process contributed 22 +/- 15% of the overall COD removal, but large molecule acids (e.g. lactic acid) and small molecule alcohols (e.g. glycerol) were reoccurred, contributing to the effluent COD with recalcitrant hydrocarbons (e.g. n-Octadecane). Reject water increased the extracellular proteins/polysaccharides ratio of PN and anammox sludge, promoting the adsorption and degradation of organic compounds. High-throughput sequencing results showed that denitrifying bacteria of Ottowia increased from 0.03% to 14.4% in PN reactor, and of Denitratisoma increased from 9.6% to 15.4% in anammox reactor. The occurrence of these denitrifiers might mitigate the negative impact of organics to functional organisms. This study highlights the organics fate during PN-anammox treatment system, which is important to maintain the robust nitrogen removal when treating organics-containing and high ammonium concentration wastewater"
Keywords:		*Ammonium Compounds Bioreactors Denitrification Nitrogen Oxidation-Reduction *Sewage Wastewater Water Nitrogen removal Organic compounds evolution Partial nitritation-anammox Reject water;
Notes:		"MedlineWang, Weigang Xie, Hongchao Wang, Han Xue, Hao Wang, Junjie Zhou, Mingda Dai, Xiaohu Wang, Yayi eng England 2020/07/28 Water Res. 2020 Oct 1; 184:116197. doi: 10.1016/j.watres.2020.116197. Epub 2020 Jul 16"