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Journal of Chemistry
Volume 2013, Article ID 296312, 6 pages
Research Article

Factors Influencing Nitrogen Removal in a Decentralized Sewage Treatment Reactor

1College of Environmental Science and Engineering, Zhejiang Gongshang University, Zhejiang, Hangzhou 310018, China
2Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Zhejiang Gongshang University, Zhejiang, Hangzhou 310018, China
3China SINOMACH Heavy Industry Corporation, Beijing 100102, China
4Juhua Group Corporation, Zhejiang, Quzhou 324004, China

Received 27 June 2012; Revised 13 August 2012; Accepted 13 August 2012

Academic Editor: Wenshan Guo

Copyright © 2013 Dong-Sheng Shen et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A decentralized sewage treatment reactor was designed to treat wastewater in rural areas. To examine the factors influencing nitrogen removal, experiments were carried out at three levels of hydraulic surface load, three sludge concentrations, and three environment temperatures at low dissolved oxygen concentrations. The rate of denitrification decreased, and the rate of nitrification increased as the surface load rose. The maximum denitrification rate was 20.01 ± 3.02 g/(m3·d) at a surface load of 1.11 ± 0.13 m3/(m2·h). The total nitrogen (TN) removal, efficiency initially increased and then decreased as the sludge concentration rose. When the sludge concentration increased to 3.5 ± 0.3 g/L, the system showed a good level of TN removal and a denitrification rate of 28.58 ± 1.22 g/(m3·d) was achieved. Low temperature had a negative effect on the removal and transformation of nitrogenous pollutants.