Potential of duckweed (Lemna minor) for removal of nitrogen and phosphorus from water under salt stress

JOURNAL OF ENVIRONMENTAL MANAGEMENT

卷:187

Article

Liu, Chunguang^1,2  Dai, Zheng¹  Sun, Hongwen¹ 

[1] Nankai Univ, Minist Educ, Key Lab Pollut Proc & Environm Criteria, Tianjin 300350, Peoples R China

[2] Tianjin Key Lab Environm Remediat & Pollut Contro, Tianjin 300350, Peoples R China

关键词: Duckweed;    Lemna minor;    Nitrogen;    Phosphorus;    Salt stress;   

DOI  :  10.1016/j.jenvman.2016.11.006

来源: Elsevier

【 摘 要 】

Duckweed plays a major role in the removal of nitrogen (N) and phosphorus (P) from water. To determine the effect of salt stress on the removal of N and P by duckweed, we cultured Lemna minor, a common species of duckweed, in N and P-rich water with NaCl concentrations ranging from 0 to 100 mM for 24 h and 72 h, respectively. The results show that the removal capacity of duckweed for N and P was reduced by salt stress. Higher salt stress with longer cultivation period exerts more injury to duckweed and greater inhibition of N and P removal. Severe salt stress (100 mM NaCl) induced duckweed to release N and P and even resulted in negative removal efficiencies. The results indicate that L. minor should be used to remove N and P from water with salinities below 75 mM NaCl, or equivalent salt stress. (C) 2016 Elsevier Ltd. All rights reserved.

【 授权许可】

Free