Characteristics of pollutants behavior in a stormwater constructed wetland during dry days

doi:10.1007/s11783-012-0426-7

Front Envir Sci Eng

2012, Vol. 6

Issue (5) : 649-657 https://doi.org/10.1007/s11783-012-0426-7

RESEARCH ARTICLE

Characteristics of pollutants behavior in a stormwater constructed wetland during dry days

Jianghua YU¹, Kisoo PARK², Youngchul KIM²(

)

1. College of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, China; 2. Department of Environment Engineering, Hanseo University, Seosan 356706, R. O. Korea

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Abstract

A stormwater wetland treating non-point source pollution (NPS) from a 64 ha agricultural watershed was monitored over a period of five months. The results indicated that pH and dissolved oxygen (DO) were increased in the wetland due to the algal growth. The highest total suspended solids (TSS) concentration was observed in the aeration pond due to the resuspension of solids, decreased in the wetland. The respective decreases in total nitrogen (TN) and total kjeldahl nitrogen (TKN) were 15.9% and 28.7% on passing through the wetland. The nitrate and ammonia were increased by 45.4% and decreased by 79.9%, respectively. These variations provided strong evidence for the existence of nitrification. The total phosphorus (TP) and phosphate had respective reductions of 52.3% and 58.2% over the wetland. The total chemical oxygen demand (TCOD) and soluble chemical oxygen demand (SCOD) were also decreased. Generally, the TN, TP and phosphate removal efficiencies were positive. These positive removal efficiencies were mainly due to microbial activities, uptake by plants, and chemical precipitation at high pH. Negative removal efficiencies can be caused by continuous rainfall activities, with short antecedent dry days (ADDs) and unstable hydraulic conditions, some other biogeochemical transformations and algal growth also being important parameters.

Keywords constructed stormwater wetland dry days nitrification and denitrification pollutants characteristic

Corresponding Author(s): KIM Youngchul,Email:ykim@hanseo.ac.kr

Issue Date: 01 October 2012

Cite this article:

Jianghua YU,Kisoo PARK,Youngchul KIM. Characteristics of pollutants behavior in a stormwater constructed wetland during dry days[J]. Front Envir Sci Eng, 2012, 6(5): 649-657.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-012-0426-7
https://academic.hep.com.cn/fese/EN/Y2012/V6/I5/649

Fig.1 Sketch of the stormwater wetland

Tab.1 Physical characteristics and parameters of the wetland system

Tab.2 Weather information on the day of the monitoring work

Fig.2 Changes in the temperature (a), DO (b), and pH (c)

Tab.3 Pollutant behaviors in the wetland

Fig.3 Changes in the TSS (a) and (b) in the wetland

Fig.4 Changes in and : (a) in the wetland; (b) in the wetland; (c) nitrogen species between the influent and effluent

Tab.4 Percentages of the nitrogen species between the influent and effluent

Fig.5 Changes of dissolved total nitrogen and particulate total nitrogen in the wetland

Fig.6 Changes of phosphorus concentrations in the wetland: (a) TP and ; (b) DTP and PTP

Fig.7 Total chemical oxygen demand (a), soluble chemical oxygen demand (b), and insoluble chemical oxygen demand (c)

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