Research Progress on Purification Mechanism of Pollutants in Urban StormwaterRunoff by Pervious Concrete
LIU Wanwan1, MA Kunlin1, ZHANG Chuanqin2, LONG Guangcheng1, XIE Youjun1, BIAN Wei1,3
1 College of Civil Engineering, Central South University, Changsha 410075; 2 School of construction management, Jiangsu Vocational Institute of Architectural Technology, Xuzhou 221116; 3 Shanxi Transportation Technology Research & Development Co. Ltd., Taiyuan 030032
Abstract: Pervious concrete is a kind of concrete without or with few fine aggregate and with large volume fraction of connected pores. It has been widely used in light-load pavement, parking lot, square, sidewalk, medial divider and shoulder of highway. Pervious concrete not only plays an active role in drainage of urban road pavement, mitigation of urban heat island effect and absorption of vehicle noise, but also can collect and filter runoff from road surface and allow runoff to infiltrate into soil, which effectively supplies groundwater and realizes the reuse of rainwater. Due to the special structure of pervious concrete, it shows good performance and potential in purifying pollutants from stormwater runoff. The basic composing component of the pervious concrete has some efficiencies of removing pollutants in the stormwater runoff. In recent years, in addition to studying the removal mechanism of the pollutants in the stormwater runoff, the researchers have also been working to research solutions and mechanisms that can improve efficiencies of removing pollutants by the pervious concrete. At present, the ways to improve the perfor-mance of pervious concrete in removing pollutants from stormwater runoff include: (i) mixing ash, bentonite and diatomite to replace some cementitious materials in pervious concrete; (ii) replacing some coarse aggregates with zeolite and ceramsite; (iii) the photocatalyst material is introduced into the pervious concrete by covering, incorporation, etc.; (iv) and a biofilm for removing pollutants is formed on the surface of the per-vious concrete by microbial culture. Among them, the photocatalytic effect of the photocatalyst material in the pervious concrete is mainly to remove the organic matter in the stormwater runoff; the biofilm is mainly to remove the organic matter and nitrogen pollutants in the stormwater runoff. In view of the various methods described above, this paper summarizes the research progress about that the removal efficiencies and mechanisms of that basic composing component of pervious concrete, admixtures, modified aggregates, photocatalyst materials and biofilms remove insoluble suspended particles, nitrogen and phosphorus, some heavy metal ions and organic matter in stormwater runoff. At the same time, research and development of pervious concrete to purify pollutants in stormwater runoff are prospected. The introduction of admixtures, modified aggregates, photocatalyst materials and biofilm into pervious concrete may have a certain impact on its performance; the cost of introducing photocatalyst materials and biofilm to pervious concrete is relatively high, and it is still unclear whether they will cause other effect to the environment; the pervious concrete will adsorb pollutants for a long time, which will cause pores to clog and affect its research. These issues still require further research.
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2019, Vol. 33 
