Journal of Resources and Ecology ›› 2020, Vol. 11 ›› Issue (5): 525-530.DOI: 10.5814/j.issn.1674-764x.2020.05.010

• Human Activities and Ecosystem • Previous Articles     Next Articles

Physiological Responses of Pistia stratiotes and Its Fluoride
Removal Efficiency

ZHANG Yun, CHEN Jinfa*()   

  1. Department of Resource & Environment, Xichang University, Xichang 615000, Sichuan, China
  • Received:2020-04-01 Accepted:2020-05-25 Online:2020-09-30 Published:2020-09-30
  • Contact: CHEN Jinfa
  • Supported by:
    The National Natural Science Foundation of China(E080402);Two High Foundation of Xichang College(LGLZ201906)

Abstract:

Phytoremediation technology using aquatic plants is being used increasingly in constructed wetlands to purify wastewater. The physiological responses of water lettuce (Pistia stratiotes) and its effectiveness in removing fluoride (F -) from water are described in this article. The results indicate that Pistia stratiotes has the ability to accumulate F -. The removal efficiency ranged from 27.79% to 56.32% for the various initial F -concentrations tested, and was highest (56.32%) in the highest initial concentration group 60mg/L. The F - concentrations in control groups (without Pistia stratiotes) changed very little, from -1.135% to -0.007% of the initial concentrations. At the highest removal rate, the bioconcentration factor was 7.84. The rate of purification conformed to the Michaelis-Menten equation, and the correlation coefficients (R 2) were all greater than 0.97. The Specific Growth Rates (SGR) of the treatment groups were -8.03% to -1.22%, and the SGR of plants under F -stress decreased during the experimental period. The partial correlation analysis showed that concentrations of F - in water were strongly linearly correlated with peroxidase.

Key words: P. stratiotes, antioxidant enzyme, fluoride, dynamic, POD