Research on the Control of Chemical Oxidants over Water-Blooming Cyanobacteria
CHEN Chao1,2,3, FAN Fan1,3, SHI Xiao-li1, YANG Zhen1, CHEN Kai-ning1, LI Yun-xiang2
1. State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China;
2. College of Environmental Science and Engineering, China West Normal University, Nanchong 637009, China;
3. University of Chinese Academy of Sciences, Beijing 100049, China
Algaecide treatment is a management strategy to control cyanobacterial blooms. This study assessed three oxidizers such as hydrogen peroxide (H2O2), potassium ferrate (K2FeO4) and sodium percarbonate (Na2CO4), on mitigating cell numbers and inhibiting the photosynthetic activity of cyanobacteria colonies collected from natural lake. Addition of those three algaecides could disrupt cyanobacteria cells and inhibit the maximum (Fv/Fm) and actual (Fv'/Fm') quantum yield of cyanobacteria, and the inhibitory effect was enhanced when the concentration of algaecides increased. Cyanobacteria cells tended to be more sensitive to H2O2, in comparison with other two algaecides. In addition, H2O2 decomposed more rapidly, and mitigating efficiency as well as the inhibitory effect of photosynthetic activity declined when cyanobacteria biomass increased. When the initial cell density was 10and 100μg/L, the inhibition rate of 5mg/L H2O2 on the maximum quantum yield of cyanobacteria was 10% and 1%, while the degradation rate was 64.9% and 97.5%, respectively. These results indicated that using H2O2 for cyanobacterial bloom control should be exerted when cyanobacteria biomass is relatively low, since the low dosage could function well at the early stage of cyanobacterial bloom.
陈超, 范帆, 史小丽, 阳振, 陈开宁, 黎云祥. 化学氧化剂对水华蓝藻的控制研究[J]. 中国环境科学, 2018, 38(11): 4307-4313.
CHEN Chao, FAN Fan, SHI Xiao-li, YANG Zhen, CHEN Kai-ning, LI Yun-xiang. Research on the Control of Chemical Oxidants over Water-Blooming Cyanobacteria. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(11): 4307-4313.
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