1 Title, Journal and Authors
Title : MIB-Producing cyanobacteria (Planktothrix sp.) in a drinking water reservoir: Distribution and odor producing potential
Journal : Water Research 68 (2015) 444-453
Authors : Ming Su a, Jianwei Yu a,*, Junzhi Zhang b, Hui Chen a, Wei An a, Rolf D. Vogt c, Tom Andersen d, Dongmin Jia e, Jingshi Wang e, Min Yang a,*
a State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences,
Chinese Academy of Sciences, P.O. Box 2871, Beijing 100085, China
b Beijing Climate Change Respond Research and Education Centre, Beijing University of Civil Engineering and
Architecture, 1 Zhanlan Rd., Xicheng, Beijing 100044, China
c Department of Chemistry, University of Oslo, 0315 Oslo, 1033, Norway
d Department of Biosciences, University of Oslo, 0316 Oslo, 1066, Norway
e Miyun Reservoir Administration, Xiwenzhuang, Miyun, Beijing 101512, China
2 Summary
2.1 Abstract
Objective
Relationship between 2-MIB and Planktothrix sp.
Planktothrix sp. Bloomed during September and October Causing high level of MIB in the reservoir
Methods
Measure the concentration of MIB and the biomass of MIB-producing cyanobacteria Planktothrix
Different site and depth during different season
Quantile Regression analysis
Result
Shallow region of the reservoir is the major habitat for Planktothrix sp. due to that the light is able to penetrate down to the relatively high concentrations of nutrients close to the sediments.
Quantile regression analysis between Planktothrix biomass and MIB concentration shows that the risk of MIB exceeding the odor threshold in water was as high as 90%
Conclusion
: The shallow region of the reservoir is the major habitat for planktothrix sp., and therefore should be carefully monitored to avoid the situations that may lead to high odor generation
: It is desirable that planktothrix cell density is below 4.0x10^5 cells L-1 to avoid the occurrence of serious MIB episode in the reservoir.
: Increasing water level in the shallow region might be a possible solution to prevent Planktothrix growth.
2.2 Methods
Quantile regression
Quantile regression methods offers a systematic strategy for examining how covariates influence the location, scale, and shape of the entire response distribution by complementing the exclusive focus on the conditional mean of classical least-square regressions.
2.3 Results
Temporal and Spatial distribution of Planktothrix and MIB
Seasonality
3월 ~ 7월 : Low
September, October : Peak concentration
Decreased Relationship between Planktothrix biomass and MIB concentration
2.4 Discussion
MIB producing potential of Planktothrix sp.
Earth/Musty odor -> problems
Less than 50 of the more than 2000 species -> directly confirmed as MIB and/or geosmin producers. (Algae : Source to treatment, Association, 2010)
High concentration of MIB -> high cell density of Planktothrix
High Planktothrix abundance -> not necessarily result in high MIB concentration.
Reason : potential for MIB production by Planktothrix may not governed merely by the cell density, but also by other factors, such as gene expression and regulation as well as water temperature, However, no significant correlation between Temperature and MIB was acquired.
2.5 Conclusion
Shallow region -> major habitat for planktothrix sp. -> carefully monitored to avoid the situations
Planktothrix sp. cell density is related to concentration of MIB.
Increasing water level in the shallow region might be a possible solution to prevent Planktothrix growth.
3 Originality& Creativity
부착조류 (planktothrix sp.) 와 MIB 농도 사이에 대한 내용을 서술.
: Shallow region에서는 MIB의 농도가 높을 수 있음
: 수위를 높이면 부착조류에 의한 맛냄새물질의 농도가 낮아질 것으로 예상됨
: 모든 남조류가 맛냄새물질을 방출하지 않음, 대략 2000종 중 50종정도만 맛냄새물질을 배출함.
4 Application to research
5 Contact
Environmental Systems Engineering Lab.
Department of Environmental Science & Engineering
Gwangju Institute Science and Technology
1 Oryong-dong Buk-gu Gwangju, 500-712, Korea
Tel : +82-62-970-2461
Fax : +82-62-970-2434
Phone : +82-10-6312-7187
E-mail :