Purification effect of bioretention with improved filler on runoff pollution under low temperature conditions

Jiaqing Xiong; Junguo Zhu; Guohao Li; Yuan Yang; Shengxia An; Chengkui Liu; Jiaxuan Wang

doi:10.1016/j.jenvman.2021.113065

Purification effect of bioretention with improved filler on runoff pollution under low temperature conditions

J Environ Manage. 2021 Oct 1:295:113065. doi: 10.1016/j.jenvman.2021.113065. Epub 2021 Jun 23.

Authors

Jiaqing Xiong¹, Junguo Zhu², Guohao Li³, Yuan Yang², Shengxia An⁴, Chengkui Liu⁴, Jiaxuan Wang⁵

Affiliations

¹ School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Yan Ta Road. No.13, Xi'an, 710055, China; Key Lab of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an, 710055, PR China. Electronic address: xiongjiaqing@xauat.edu.cn.
² School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Yan Ta Road. No.13, Xi'an, 710055, China; Key Lab of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an, 710055, PR China.
³ Key Lab of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an, 710055, PR China; Xi'an University of Architecture and Technology University of South Australia and An De College, Xi'an, 710055, China.
⁴ Qinghai Building and Materials Research Academy Co.,Ltd, NO.6, Jianyan Lane, Wusi West Road, Xining City, 8 10008, China.
⁵ School of Architecture and Civil Engineering, Xi'an University of Science and Technology, Yan Ta Road, No. 58, Xi'an, 710054, China.

PMID: 34171776
DOI: 10.1016/j.jenvman.2021.113065

Abstract

In recent years, there have been a number of studies on bioretention during hot summer, with only few studies reported during low-temperature winters. The application of bioretention in cold areas still lacks effective guidance. In this study, runoff simulation experiments were conducted to explore the influence of wood chips filler and water treatment residue on the removal of runoff pollutants under different packing gradations and low temperature conditions. Under low temperature, nitrate nitrogen removal rate of wood chips filler decreased from 70% to 90% in autumn to -23%- 35% in winter, the total nitrogen removal rate decreased from 75 to 90% in autumn to 20%-50% in winter, the removal rate of ammonia nitrogen and total phosphorus exceeded 70% during the entire experiment. Water treatment residue filler maintained a high ammonia nitrogen and total phosphorus removal rate during the experiment, with the total phosphorus removal rate above 90% and ammonia nitrogen removal rate above 80%. The bioretention effluent concentration of nitrate and total nitrogen was higher than 7.3 mg/L and 8.5 mg/L, respectively, most of the time. However, at low temperature, the COD removal rate of the two fillers was 25%-50%, which was very poor. Therefore, wood chips filler was observed to be better suited for the removal of nitrate and total nitrogen from the runoff, while water treatment residue had a better effect on the removal of ammonia nitrogen and total phosphorus in winter. Thus, for the application of bioretention in northern China, appropriate fillers should be selected considering the water quality characteristics of the area.

Keywords: Bioretention; Improved filler; Low temperature; Purification effect; Runoff pollution.

MeSH terms

China
Nitrogen / analysis
Phosphorus / analysis
Rain
Temperature
Water Pollutants, Chemical*
Water Purification*

Substances

Water Pollutants, Chemical
Phosphorus
Nitrogen