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Frontiers of Environmental Science & Engineering

Front. Environ. Sci. Eng.    2017, Vol. 11 Issue (6) : 1
Formation of disinfection byproducts from accumulated soluble products of oleaginous microalga after chlorination
Yu Liu, Qiao Zhang, Yu Hong()
Beijing Key Laboratory for Source Control Technology of Water Pollution, Beijing Forestry University, Beijing 100083, China
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SAP mainly are aromatic proteins and soluble microbial by-product-like.

[DBP] increased with cultivation time and [SAP] increasing.

The formation potential trend of DBP is as follows: TCM>DCAA>TCAA.

When microalgae are simultaneously applied for wastewater treatment and lipid production, soluble algal products (SAP) should be paid much attention, as they are important precursors for formation of disinfection byproducts (DBPs), which have potential risks for human health. Chlorella sp. HQ is an oleaginous microalga that can generate SAP during growth, especially in the exponential phase. This study investigated the contribution of SAP from Chlorella sp. HQ to DBP formation after chlorination. The predominant DBP precursors from SAP were identified with the 3D excitation-emission matrix fluorescence. After chlorination, a significant reduction was observed in the fluorescence intensity of five specific fluorescence regions, particularly aromatic proteins and soluble microbial by-product-like regions, accompanied with slight shifting of the peak. The produced DBPs were demonstrated to include trihalomethanes and haloacetic acids. As the algal cultivation time was extended in wastewater, the accumulated SAP strengthened the formation of DBPs. The trend for DBP formation was as follows: chloroform>dichloroacetic acid>trichloroacetic acid.

Keywords Chlorella sp. HQ      Chlorination      Disinfection byproducts      Fluorescence spectroscopy      Soluble algal products     
Corresponding Authors: Yu Hong   
Issue Date: 10 May 2017
 Cite this article:   
Yu Liu,Qiao Zhang,Yu Hong. Formation of disinfection byproducts from accumulated soluble products of oleaginous microalga after chlorination[J]. Front. Environ. Sci. Eng., 2017, 11(6): 1.
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Yu Liu
Qiao Zhang
Yu Hong
Fig.1  Growth curve of Chlorella sp. HQ cultivated in simulate secondary effluent (mBG11)
Fig.2  Change in (a) SAP concentration, (b) SAP production rate and cell growth rate as cultivation time was extended
Fig.3  Relationship between algal density and SAP concentration at 15–30 d
Fig.4  3D-EEM for the SAP of Chlorella sp. HQ at cultivation of 15, 20, and 25 d before and after chlorination
Cl2 /(mg·L-1)cultivation time/dIIIIIIIVV
Ex/Em /(nm/nm)FI/AUEx/Em /(nm/nm)FI/AUEx/Em /(nm/nm)FI/AUEx/Em /(nm/nm)FI/AUEx/Em /(nm/nm)FI/AU
Tab.1  Fluorescence characteristics of the SAP from Chlorella sp. HQ at different growth stages before and after chlorination
Fig.5  DBP formation from SAP of Chlorella sp. HQ at exponential and stationary phases
Fig.6  Formation potential of DBP from SAP of Chlorella sp. HQ at exponential and stationary phases
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