Journal of Environmental Engineering Technology ›› 2019, Vol. 9 ›› Issue (1): 96-102.doi: 10.3969/j.issn.1674-991X.2019.01.015

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Advance of research on urban non-point source pollution control by bioretention facilities

JIANG Dengling1,ZHANG Danrong1,2,HE Liansheng2,HU Chunming2,WANG Gongting1,2,HUO Chuan1,2,MENG Rui2,*()   

  1. 1. College of Architectural Engineering Institute, North China University of Science and Technology, Tangshan 063210, China
    2. Chinese Research Academy of Environmental Sciences, Beijing 100012, China
  • Received:2018-05-23 Online:2019-01-20 Published:2019-01-15
  • Contact: Rui MENG E-mail:815243@163.com

Abstract:

Bioretention is one of the effective measures to control urban non-point source pollutions. A synthetic analysis of its structure, hydrologic effects, purification mechanisms and influence factors was presented. Bioretention can mitigate the stormwater and peak flow volume. It can effectively reduce the concentration of total suspended solids, particulate matter, heavy metals, organic pollutants and pathogens in stormwater runoff, but the removal of nitrate nitrogen and dissolved phosphorus is not stable. Bioretention facilities remove pollutants mainly through precipitation, filtration, adsorption, ion exchange, plant absorption and biodegradation. The removal of pollutants and reduction of stormwater volume are influenced by plant species, filler composition, depth, hydraulic conductivity and carbon addition. A long drying period will increase the nitrate concentration and setting internal water storage can reduce nitrate concentration. The structural design, operation and maintenance need to be further studied and optimized.

Key words: urban non-point source, bioretention facility, hydrologic effect, influence factor

CLC Number: 

  • X703.1