Efficiency and mechanism of nitrogen and phosphorus removal in modified zeolite wetland

被引：7
|
作者：
Wu P. [1 ]
Lu S.-J. [2 ]
Xu L.-Z. [1 ]
Liang Q.-Q. [1 ]
Shen Y.-L. [1 ,3 ,4 ]
机构：
[1] School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou
[2] Suzhou Environmental Science Research Institute, Suzhou
[3] Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment, Suzhou
[4] Jiangsu Provincial Key Laboratory of Environmental Science and Engineering, Suzhou
来源：
Shen, Yao-Liang (ylshen@mail.usts.edu.cn) | 1600年 / Science Press卷 / 38期
关键词：
Constructed wetland; Decentralized rural sewage; Efficiency; Mechanism; Modified zeolite; Nitrogen and phosphorus removal;
D O I：
10.13227/j.hjkx.201607190
中图分类号：
学科分类号：
摘要：
To study the efficiency and mechanism of nitrogen and phosphorus removal for decentralized rural sewage in modified zeolite wetland, the modified zeolite was applied as substrate into a combined process composed of anaerobic baffled reactor (ABR) and baffled flow constructed wetland (BFCW), providing a new way for rural sewage treatment in Suzhou City. The study was contrasted with zeolite wetland. The results showed that the modified zeolite wetland had high efficiency and stability of nitrogen and phosphorus removal, and the nitrogen and phosphorus removal quantities of modified zeolite wetland were 1.8% and 1 times higher than those of zeolite wetland during the trial. The modified zeolite wetland mainly removed nitrogen and phosphorus by substrate adsorption, and the main fractions of modified zeolite were Ca-P and Al-P. The oxygen-secretion and absorption of plants stabilized the water quality of the effluent. The substrate adsorption was the main nitrification removal pathway in front of the wetland, and nitrification and denitrification were the main nitrification removal pathways at the end of the wetland. The nitrogen and phosphorus adsorption capacities during the pilot test were much higher than those of the static test. The optimization of phosphorus adsorption capacity for modified zeolite was achieved under the synergy of multiple pathways. The effect of configuration and plant root was the main reason for the difference of nitrogen and phosphorus adsorption quantities. Nitrification intensity led to the seasonal fluctuation of nitrogen removal effect and stability in modified zeolite wetland, and the low nitrification intensity in the front of wetland was related to the strong adsorption of NH4+-N by the modified zeolite. © 2017, Science Press. All right reserved.
引用
下载
收藏
页码：580 / 588
页数：8
相关论文
共 14 条
  • [1] Xu L.Z., Lu S.J., Chen C.J., Et al., Present status and optimization of technologies for decentralized rural domestic sewage treatment in Suzhou, Journal of Suzhou University of Science and Technology (Engineering and Technology), 27, 1, pp. 5-9, (2014)
  • [2] Song X.K., Jin L., Wang J.F., Et al., Pilot-scale study on ABR-hybrid constructed wetland process for decentralized domestic sewage treatment, Chinese Journal of Environmental Engineering, 6, 9, pp. 3096-3100, (2012)
  • [3] Shi P.B., Zhu H.T., Sun D.Z., Removal efficiency of typical pollutants by different substrate combinations for constructed wetlands, Acta Scientiae Circumstantiae, 34, 3, pp. 704-711, (2014)
  • [4] Tan L.L., Xie Y.R.W., Bai S.Y., Et al., Effect of substrate structure on pollutant degradations through substrate of horizontal subsurface flow constructed wetlands, Chinese Journal of Environmental Engineering, 8, 11, pp. 4669-4673, (2014)
  • [5] Zhang J., Li R.H., Li J., Et al., Limestone and pyrite-limestone constructed wetlands for treating river water, Environmental Science, 34, 9, pp. 3445-3450, (2013)
  • [6] Chen L.L., Zhao T.K., Zhang C.J., Et al., Phosphorus adsorption properties of different substrates in constructed wetland, Journal of Agro-Environment Science, 31, 3, pp. 587-592, (2012)
  • [7] Lu S.J., Wu P., Chen C.J., Et al., Screening and modifying of suitable substrates to improve phosphorus removal capability of constructed wetlands for decentralized sewage treatment, Chinese Journal of Environmental Engineering, 8, 9, pp. 3807-3812, (2014)
  • [8] Huang J., Wang S.H., Yan L., Et al., Intensity of nitrification and denitrification in subsurface-flow constructed wetlands, Environmental Science, 28, 9, pp. 1965-1969, (2007)
  • [9] Breen P.F., A mass balance method for assessing the potential of artificial wetlands for wastewater treatment, Water Research, 24, 6, pp. 689-697, (1990)
  • [10] Chen M.L., Wu X.F., Chen Y.H., Et al., Construction of a landscaping-type wetland system for wastewater treatment and analysis of plant denitrifying effect, Environmental Science, 31, 3, pp. 660-666, (2010)
12