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Multivariate statistical analysis of temporal–spatial variations in water quality of a constructed wetland purification system in a typical park in Beijing, China

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Abstract

Using discriminant analysis (DA) and principal component analysis/factor analysis (PCA/FA), we described the variations in the water quality of a constructed wetland (CW) purification system in Olympic Park supplied with reclaimed water (RW). The analyses were conducted across three seasons (spring, summer, and autumn) and four functional zones (composite vertical flow constructed wetland [CVW], plant oxidation pond [POP], mixed oxidation pond [MOP], and main lake [ML]). The results demonstrated the relatively high water quality of the CW, which was suitable for landscape reuse. The most severe contamination occurred in autumn and in the ML/MOP. Chemical oxygen demand (CODMn), NO3 −-N, oxidation–reduction potential (ORP), and total nitrogen (TN) caused 91.8 % of the temporal variations while DO, cyanobacteria (PCY), and pH caused 70.8 % of the spatial variations. The low accuracy of the DA indicated that the four functional areas exhibited similar pollution characteristics. Internal pollution was the major pollutant source in all selected seasons/functional zones. In spring, the CW was largely affected by organic matters. In summer, the CW was contaminated chiefly by nutrient pollutants (N and P), particularly in the CVW and POP. In autumn, the major threat became eutrophication. Enhancing water circulation and shortening hydraulic retention time can effectively weaken the effect of nutrient salts and organic pollutants.

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Abbreviations

CW:

Constructed wetland

CVW:

Composite vertical flow constructed wetland

DA:

Discriminant analysis

FCA:

Fuzzy comprehensive assessment

MOP:

Mixed oxidation pond

ML:

Main lake

N and P:

Nitrogen and phosphorus

ORP:

Oxidation–reduction potential

PCA/FA:

Principal component analysis/factor analysis

PCY:

Cyanobacteria

POP:

Plant oxidation pond

RW:

Reclaimed water

Sal:

Salinity

SCA:

Spearman correlation analysis

TDS:

Total dissolved solids

VF:

Varifactor

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (No. 40901281), the Beijing of Education Science and Technology Program (KM201310028012), and the International S&T Cooperation Program of China (2014DFA21620).

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Authors and Affiliations

  1. College of Resources, Environment and Tourism, Capital Normal University, 100048, Beijing, China

    Dongqing Li, Chaofan Guo & Xiaoyu Guo

  2. Environmental Development Center of Ministry of Environmental Protection, 100029, Beijing, China

    Di Huang

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  1. Dongqing Li
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  2. Di Huang
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  4. Xiaoyu Guo
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Correspondence to Xiaoyu Guo.

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Li, D., Huang, D., Guo, C. et al. Multivariate statistical analysis of temporal–spatial variations in water quality of a constructed wetland purification system in a typical park in Beijing, China. Environ Monit Assess 187, 4219 (2015). https://doi.org/10.1007/s10661-014-4219-2

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