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The Formation Process and Impact Factors of Haas Upon Chlorinating Blue-green Algae

Author: WuXiuZhen
Tutor: GeFei
School: Xiangtan University
Course: Environmental Engineering
Keywords: HAAs Blue-green algae Chlorination Xiangjiang River raw water
CLC: TU991.2
Type: Master's thesis
Year: 2011
Downloads: 30
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Abstract


One of the important tasks is to protect the safety of drinking water control disinfection byproducts in drinking water (Disinfection By-Products, DBPs), HAAs (Haloacetic acids, HAAs) is a typical class of disinfection by-products. Algae researcher chloride generated HAAs control of disinfection by-products is of great significance. In this thesis, the target of four common blue-green algae in the freshwater green algae Chlorella (Chlorella vulgaris) and Scenedesmus obliquus (Scenedesmus obliquus) as representatives, Pseudomonas Microcystis (Microcystis aerugrinosa) and the blunt top spiral algae (Spirulina platensis) as cyanobacteria representatives of different blue-green algae chloride generated HAAs. On this basis, the key research chlorella chloride generate HAAs influencing factors and examines the characteristics of Xiangjiang River raw water chlorination HAAs study achieved the following results: (1) four kinds of blue-green algae chloride generated HAAs volume increases with increasing reaction time, substantially stable at 24 h of reaction. HAAS generation amount increases with the increase in pH and in a pH of 6-8,. When the reaction time of 24 h, pH = 8, chlorella chlorination dichloroacetate (Dichloroacetic acid, DCAA) and trichloroacetic acid (Trichloroacetic acid, TCAA) amount respectively to reach 34.5μg/mgTOC and the 42.0μg/mgTOC . Compared with Chlorella, Scenedesmus obliquus chloride to generate the amount of DCAA and TCAA, respectively, higher than the 25.0% and 3.0%, the Microcystis aeruginosa chloride generated DCAA and TCAA respectively 58.0% and 47.0% higher, blunt The amount of the Spirulina platensis chloride generating DCAA and TCAA, respectively, 17.0% and 19.0% higher. Four blue-green algae Microcystis aeruginosa chlorination of HAAs. Analysis of four algae biochemical composition, of HAAs formation and protein content of the algal cells positive correlation. (2) chlorella as representative the cyanobacterium chloride generated HAAs Factors Affecting: HAAs generation amount increases as the temperature rises, and the generation amount of DCAA and TCAA 20 ℃ -25 ℃ The highest were 38.0μg/mgTOC and 42.0μg/mgTOC. Metal ions Cu 2 to promote the generation of DCAA, but significantly inhibited the TCAA generation and enhanced inhibition increased with the increase of pH. When pH = 8.0, Cu 2 amount of 1.0 mg / L, TCAA formation compared to the control group decreased 25.0μg/mgTOC. The comparative analysis shows that Cu 2 protein chloride generated HAAs impact with chlorella similar Cu 2 the chlorella chloride and Chlorella in protein content. Water anionic HAAs generated performance for: HAAs generation amount first decreased and then increased the trend with the increase in the concentration of F-F-concentration of 0.9 mg / L, compared with the control group, DCAA and TCAA reduce 23.0% and 30.0%, respectively, when the F-concentration of 1.5 mg / L of DCAA and TCAA generation fell by only 15.0% and 1.0%. The SO 4 2 - and NO 3 - of HAAs in Chlorella chlorination process generates impact smaller . (3) the Xiangjiang raw water chlorination the summer generated HAAs generate the amount of the highest and lowest in winter. Summer chlorination of the raw water in the amount of DCAA and TCAA were 33.5μg / L and 31.0μg / L, Winter were only 17.0μg / L and 18.0μg / L.

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