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Shan M.J.,Beijing Normal University | Shan M.J.,Beijing Water Business Doctor Co. | Zhang Y.,Beijing Water Business Doctor Co. | Kou L.H.,Beijing Water Business Doctor Co.
Advanced Materials Research | Year: 2013

Partial nitrification-anaerobic ammonium oxidation-nitrification coupled technology was used for removing nitrogen from coking wastewater. Through continuous optimization of the nitrogen removal technology, NH4 +-N, N02 -N and N03 --N concentrations in the effluent stabilized at 0~3, 0~0.5 and 5~20 mg/L, C0D<100 mg/L, the effluent quality could meet the primary standard of "Integrated wastewater discharge standard (GB8978-1996)". The removal efficiencies of NH4 +-N and COD reached up to 99.5% and 96.1% respectively. The novel technology performed well for treating coking wastewater, nitrogen and organic pollutants were simultaneously removed efficiently. © (2013) Trans Tech Publications, Switzerland.

Shan M.,Beijing Normal University | Shan M.,Beijing Water Business Doctor Co. | Zhang Y.,Beijing Water Business Doctor Co. | Kou L.,Beijing Water Business Doctor Co.
Water Science and Technology | Year: 2014

This paper describes the total nitrogen balance, and the direction and degree of nitrogen transformation during the nitrification process of coking wastewater. According to the actual nitrification process, the conventional nitrification kinetic equation was amended. After 48 h of nitrification, the total nitrogen content remained almost the same with error less than 0.6%. The total removal efficiency of NH4 +-N was 91.1%, in which blow-off, producing cells and transforming to nitrate nitrogen accounted for 1.1, 17.8 and 72.2% respectively. Considering the influences of NH 4 +-Nblow-off and conversion from cyanide, thiocyanide and organic nitrogen, the nitrification kinetic equation was amended as μ′ = 0:82 · S/(0.48 + S). © IWA Publishing 2014.

Xu X.,Dalian University of Technology | Xue Y.,Beijing Water Business Doctor Co. | Wang D.,Dalian University of Technology | Wang G.,Dalian Polytechnic University | Yang F.,Dalian University of Technology
Bioresource Technology | Year: 2014

In order to achieve simultaneous removal of nitrogenous and organic pollutants, a novel reverse anammox-partial nitrification nitrogen removal process was developed. During steady operation, the maximum nitrogen and COD (chemical oxygen demand) removal efficiencies were over 90%, with influent NH4+-N and COD concentrations of 300 and 100mgL-1. The optimum recycle ratio of Membrane bioreactor (MBR for partial nitrification) and fixed bed reactor (anammox) for this process was recommended as 3 due to increasingly larger recycle ratio caused slight increase in TN (total nitrogen) removal efficiency. Additionally, the steady nitrogen removal rate was obtained at 0.92-1.03kgNm-3day-1. Considering its great potential in nitrogen removal, this reverse process will be revealing for the study of anammox technique. © 2013 Elsevier Ltd.

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