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Long-term pollutant removal performance and mitigation of rainwater quality deterioration with ceramsite and Cyperus alternifolius in mountainous cities of China

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Abstract

Rainwater harvesting brings various desired environmental and social benefits in urban development. Tanks in rainwater harvesting systems need low-maintenance and low-cost approaches to manage water quality, especially for scattered small rainwater tanks associated with complex terrains in mountainous cities. Four rain barrels were set up to store roof runoff at the campus of Chongqing University, Chongqing, China. Barrel 1 (B1) and barrel 2 (B2) stored the first-flush water and the roof runoff with first-flush water diverted, respectively, while barrel 3 (B3) was loaded with a biological ceramsite and barrel 4 (B4) used biological ceramsite as a substrate media and planted with Cyperus alternifolius (C. alternifolius) to treat the first-flush water. The performances of the rain barrels were evaluated as well as the variations in water quality parameters were examined. The removal efficiency of B3 was 48.2%, 76.0%, 44.3%, and 24.6% for COD, NH4+–N, TN, and TP, respectively, while B4 had removal efficiencies of 93.4%, 71.0%, 75.0%, and 76.5% for COD, NH4+–N, TN, and TP, respectively. B4 had BOD, NH4+–N, TN, and TP concentrations within the class III Chinese Standard requirement after a storage period of about 240 days. Furthermore, the turbidity in B4 kept dropping. Thus, B4 is a more promising alternative for water quality management in mountainous cities of China.

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Abbreviations

B1:

Barrels storing the first-flush roof runoff

B2:

Barrels storing the roof runoff with first-flush water diverted

B3:

Barrels filled with a biological ceramsite layer storing the first-flush roof runoff

B4:

Barrels filled a biological ceramsite layer planting C. alternifolius storing the first-flush roof runoff

COD:

Chemical oxygen demand

C COD :

COD concentration (mg L−1)

C N :

Ammonia nitrogen concentration (mg L−1)

C TN :

Total nitrogen concentration (mg L−1)

C TP :

Total phosphorus concentration (mg L−1)

N:

Nitrogen

NH4 +–N:

Ammonia nitrogen

P:

Phosphorus

SS:

Suspended solids

TN:

Total nitrogen

TP:

Total phosphorus

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Funding

This work was supported by the National Key R&D program of China [grant number 2017YFC0404704].

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Correspondence to Hongxiang Chai.

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The authors declare that they have no conflict of interest.

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Responsible editor: Philippe Garrigues

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Chai, H., Chen, Z., Shao, Z. et al. Long-term pollutant removal performance and mitigation of rainwater quality deterioration with ceramsite and Cyperus alternifolius in mountainous cities of China. Environ Sci Pollut Res 26, 32993–33003 (2019). https://doi.org/10.1007/s11356-019-06328-y

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  • DOI: https://doi.org/10.1007/s11356-019-06328-y

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