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Abstract
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.
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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.
Graphical abstract
Keywords
Chlorella sp. HQ
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Chlorination
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Disinfection byproducts
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Fluorescence spectroscopy
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Soluble algal products
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Yu Liu, Qiao Zhang, Yu Hong.
Formation of disinfection byproducts from accumulated soluble products of oleaginous microalga after chlorination.
Front. Environ. Sci. Eng., 2017, 11(6): 1 DOI:10.1007/s11783-017-0938-2
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