Reversing Clogging in Vertical-Flow Constructed Wetlands by Backwashing Treatment

Abstract:

More and more constructed wetland CW) were used to treat waste water in the world for its advantage on cheaper and efficiency. CW would clog for improper design or imperfect management, so application for it was limited. The purpose of this paper is that using backwashing method resolve filter media clogging problem which is an intractable matter in constructed wetlands project. The effects of the backwashing treatment on pollutant removal, as well as the influence on characteristics of hydraulics of wetlands, were studied. The experimental results indicate that CW hydraulic conductivity, hydraulic resistance time and removal rate of COD increased after backwashing. This paper confirmed that backwashing method can reverse clogging in vertical-flow constructed wetlands, and provided design guidance for applying backwashing method to treat clogging vertical-flow constructed wetlands.

• Periodical: Advanced Materials Research (Volumes 129-131)
• Pages: 1064-1068
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.129-131.1064
• Online since: August 2010
• Authors: Fei Ma, Li Jiang, Ting Zeng
• Keywords: Backwashing, Characteristics of Hydraulics, Clogging, Vertical-Flow Constructed Wetland

References

[1] USEPA. 2000. Constructed wetlands treatment of municipal wastewaters manual. EPA 6252R2992010, Cincinnati: Office of Research and Development, pp.12-28.

[2] Chen Liang, Lu Shao-yong, Chen Xin-hong, et al: Constructed wetlands 0peration and administration. Environmental Science and Technology, Vol. 28(2)(2005), pp.141-146.

[3] Fu Gui-ping, Wu Zhen-bin, Zhang Sheng, et al: Studies on clogging of the constructed wetland. Environmental science, Vol. 25(3)(2004), pp.144-149.

[4] Yan Lu, Wang Shi-he, Huang Juan, et al: Clogging Characteristics of the subsurface flow wetland. Environmental science, Vol. 29(3)(2008), pp.627-631.

[5] Ye Jian-feng: Research on removal mechanism for pollutant in vertical-flow constructed wetland. Tongji University(2007).

[6] Zhang Xiang-ling, Wu Zhen-bin, Wu Jun-mei, et al: Rsearch on hydraulics performance of different filter media in vertical flow constructed wetlands under high hydraulic loading. Journal of Wuhan university of technology, Vol. 30(7) (2008).

[7] Brix H, Cooper P F: Constructed wetlands for wastewater treatment in Europe. Leiden: Backhuys Publisher(1998), pp.95-118.

[8] Cooper P.: A review of the design and performance of vertical2flowand hybrid reed bed treatment systems. Wat Sci Tech, Vol. 40(3) (1999) , pp.1-9.

[9] Li Huai-zhen, Ye Jian-feng, Xu Zu-xin: Influence of alternate operation on clogging in a vertical-flow constructed wetland. Acta Scientiae Circumstantiae, Vol. 40(3) (2008) , pp.1555-1560.

[10] Zhu Wei, Hua Guo-fen, Zhao Lian-fang: A laboratory simulation study on chemical solubilization to substrate organic clogging in constructed wetland. Environmental Chemistry, Vol. 28(3) (2009) , pp.410-414.

[11] Liu wen-bing, Shi jian-fu, Huang shi-da: Study of the tracer for constructed wetland bed. Sichuan Environment, Vol. 14(4) (1995).