Effect of hydraulic loading on percolation performance and porosity of bio-retention cell system

Abstract

Abstract: Bio-retention cell system is the main way to treat rain water runoff in the initial stage. It can not only retain water and save it, but also has a certain effect in reducing pollutants. Therefore, its applications in the field of water treatment are gradually expanding. The variation of permeability coefficient and average porosity of the bio-retention cell were investigated experimentally under four different influent loads. Results coming out from the investigation indicate that both the permeability coefficient and the average porosity decrease gradually with running time, and tend to be stable finally. When the influent load is less than 2.0 m³/(m²·d), there is a certain correlation between the permeability coefficient and the average porosity. The biological structure appearing in the bio-retention cell system reaches stable when it runs for about 25 days. When the influent load is greater than or equal to 4 m³/(m²·d), the hydraulic scouring effect has a great influence on the internal biological structure of the bio-retention cell system. Variations of the permeability coefficient and the average porosity are not distinct in this case as a result.

Key words: bio-retention cell system, permeability coefficient, average porosity

CLC Number:

TU998.4

WANG Ya-jun, GENG Chong-chong, CAI Wen-juan, LI Jin-shou. Effect of hydraulic loading on percolation performance and porosity of bio-retention cell system[J]. Journal of Lanzhou University of Technology, 2020, 46(4): 139-142.

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