PHYSIOLOGICAL RESPONSE OF <i>CHLORELLA PYRENOIDOSA</i> BIOFILM TO CADMIUM STRESS AND ITS REMOVAL EFFECT

CAO Xin; WEI Qun; SU Yuan; LIAO Yun-sheng; JIN Li

doi:10.13205/j.hjgc.202002010

Volume 38 Issue 2

Feb. 2020

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CAO Xin, WEI Qun, SU Yuan, LIAO Yun-sheng, JIN Li. PHYSIOLOGICAL RESPONSE OF CHLORELLA PYRENOIDOSA BIOFILM TO CADMIUM STRESS AND ITS REMOVAL EFFECT[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(2): 77-80,127. doi: 10.13205/j.hjgc.202002010

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CAO Xin, WEI Qun, SU Yuan, LIAO Yun-sheng, JIN Li. PHYSIOLOGICAL RESPONSE OF CHLORELLA PYRENOIDOSA BIOFILM TO CADMIUM STRESS AND ITS REMOVAL EFFECT[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(2): 77-80,127. doi: 10.13205/j.hjgc.202002010

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PHYSIOLOGICAL RESPONSE OF CHLORELLA PYRENOIDOSA BIOFILM TO CADMIUM STRESS AND ITS REMOVAL EFFECT

doi: 10.13205/j.hjgc.202002010

School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China

Received Date: 2019-02-20

Abstract

Abstract

In order to study the physiological response of Chlorella pyrenoidosa biofilm and removal efficiency on cadmium(Cd), the physiological activity indexes, such as chlorophyll a, nitrate reductase and extracellular polysaccharide (EPS), were analyzed in different initial concentrations of wastewater containing Cd. Additionally, the removal efficiencies of Cd by Chlorella pyrenoidosa biofilm in different concentrations of Cd were compared. Result showed that:the growth of Chlorella pyrenoidosa biofilm and its amount of nitrate reductase were inhibited by Cd, and the degree of inhibition became stronger in higher concentration of Cd; when the concentration of Cd reached 20 mg/L, it would lead to the death of some algae biofilms; Cd would inhibite the production of EPS in Chlorella pyrenoidosa biofilm, but with the increase of contact time, Cd stimulated the biofilm to secrete a small amount of EPS to prevent metal ions from entering algal cells. The Chlorella pyrenoidosa biofilm had a good effect on removal of Cd. When the concentration of Cd was 15 mg/L, Chlorella pyrenoidosa biofilm had the highest removal efficiency on Cd, which could reach 89.83%.
- Chlorella pyrenoidosa biofilm,
- cadmium,
- physiological response,
- removal effect

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