2015 Fiscal Year Annual Research Report
Removal of precursors of nitrogenous disinfection by-products in drinking water sources by advanced treatment processes
| Project/Area Number |
26820221
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| Research Institution | The University of Tokyo |
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Principal Investigator |
Lohwacharin J. 東京大学, 工学(系)研究科(研究院), 助教 (60709517)
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| Project Period (FY) |
2014-04-01 – 2016-03-31
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| Keywords | nitrogenous DBPs / anion exchange resin / brominated DBPs / dissolved organic matter / ferrihydrite / microfiltration / membrane fouling / water treatment |
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| Outline of Annual Research Achievements |
This research, conducted for 2 years, is able to elucidate (i) formation potential (FP) of emerging nitrogenous disinfection by-products (N-DBPs) in reservoir waters collected from Ogasawara islands (i.e. Chichijima, Hahajima), Aragawa river (Saitama), Chao Phraya river (Thailand); (ii) effective advanced water treatment processes including ferrihydrite adsorption or powdered activated carbon (PAC) adsorption in combination with microfiltration and anion exchange in removing the N-DBP precursors prior to chlorination and chloramination. The experimental results show that the effectiveness of ferrihydrite or PAC adsorption of N-DBP precursor removal is dependent on the preferential removal of organic fraction removal, saturation of adsorptive sites on the surface and dominant mechanism of membrane fouling. The FP of dichloroacetonitrile and other chlorinated DBPs can be controlled by ferrihydrite adsorption. Furthermore, I found that polystyrene anion exchange resin (IRA400) has a highest ability to remove bromide, which is an inorganic precursors of DBPs, and consequently decrease the relative occurrence of brominated DBPs as compared to polyacrylic anion exchange resins. Several characterization methods for organic matter indicate that dissolved organic matter smaller than 1000 Da as well as aromatic proteins are important precursors of trihalomethane in chlorinated waters. I am preparing for publishing results in scientific journals.
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