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Phosphate removal from urban stormwater runoff using Canna lily and Cyperus alternifolius-based bioretention system

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Abstract

Rainfall is considered to be the purest form of water; however, it gets contaminated as it sweeps along suspended impurities from the atmosphere, and it traverses its path through different land uses. Hence, an effective water-sensitive urban design (WSUD) is required to treat this low-strength urban stormwater runoff to minimise water loss and to improve its quality, lest it should cause eutrophication in receiving water bodies. The current study was undertaken to explore the performance of Canna lily and Cyperus alternifolius-based constructed wetland (CW) towards the removal of phosphate from the stormwater runoff. Total phosphate removal efficiency varied from 77.5% (winter) to 82.6% (spring) to 90.3% (summer) for Canna lily based-CW; while it varied from 62.3% (winter) to 74.2% (spring) to 84.1% (summer) for Cyperus alternifolius based-CW. The phosphate removal efficiency improved with a rise in ambient temperature through the changing seasons. The increase in biomass of both the plants, and accumulation of phosphate in different plant tissue suggested that the plants should be harvested periodically and nutrients be exported for use as fodder, manure, and for thatching. Therefore, an effective design standard and code of practice is required to be developed for WSUD in India. It will help in making future studies more effective in combination with other WSUD techniques for improved pollutant removal efficiency from real stormwater runoff.

Research highlights

Canna lily and Cyperus alternifolius-based CW cells are effective tool for the removal of phosphate from the stormwater runoff.

Higher removal efficiency can be correlated with an increase in average sunshine hours.

The removal of phosphate from CW cells is correlated with increase in biomass.

An effective design standard and code of practice is required to be developed for WSUD in India.

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Data availability

Necessary data has been provided along with this manuscript.

Abbreviations

A:

Top surface of CW cell in m2

AG:

Above ground

AP:

Available phosphate

APHA:

American Public Health Association

ASTM:

American Society for Testing and Materials

BCM:

Billion Cubic Metre

BG:

Below ground

CW:

Constructed wetland

DAP:

Di-ammonium phosphate

Di :

Internal diameter of CW cell

ds :

Depth of bed substrate

e :

Void ratio

EC:

Electrical conductivity

Gs :

Specific gravity

H:

Overall height of CW cell

HDPE:

High density poly-ethylene

hf :

Free board of CW cell in cm

HRT:

Hydraulic Retention Time

n:

number of samples

TDS:

Total dissolved solids

TP:

Total phosphate

V:

Volume of CW cell in m3

WSUD:

Water Sensitive Urban Design

ρ :

Bulk density in kg/m3

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Acknowledgements

The authors are grateful to Department of Environmental Engineering at DTU for providing the facilities for conducting this study.

Funding

The authors declare that no funds, grants, or other support were received during the present study.

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Authors

Contributions

NJ: Conceptualization, execution, data compilation and draft writing. SY: Conceptualization, supervision, reviewing and editing. ST: Conceptualization, supervision, reviewing and editing. SR: Conceptualization, supervision, reviewing and editing. AKH: Conceptualization, supervision, reviewing and editing. HP: Conceptualization, supervision, reviewing and editing.

Corresponding author

Correspondence to Harsh Pipil.

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Jain, N., Yadav, S., Taneja, S. et al. Phosphate removal from urban stormwater runoff using Canna lily and Cyperus alternifolius-based bioretention system. Sustain. Water Resour. Manag. 10, 65 (2024). https://doi.org/10.1007/s40899-024-01076-5

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