Reduction of trihalomethane precursors of dissolved organic matter in the secondary effluent by advanced treatment processes

Dissolved organic matter (DOM) may do harms to human beings. After disinfected by chlorine (amine), DOM can form disinfection by-products (DBPs) which can be mutagenic, teratogenic and carcinogenic. Characterization and source of trihalomethane precursors in the secondary effluent by sequencing batch reactors were investigated. CHCl3 was the primary DBPs. The results showed that the precursors of CHCl3 were mainly strongly hydrophobic DOM, while CHCl2Br and CHClBr2 were mainly formed from hydrophilic DOM. The effects of different powder media (activated carbon, zeolite) on removal of DOM were compared. The results showed that the dosing of powder media can promote the removal of DOM and the DBPs precursors.

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Unveiling the transformation of dissolved organic matter during ozonation of municipal secondary effluent based on FT-ICR-MS and spectral analysis

Water Research ◽

10.1016/j.watres.2020.116484 ◽

2021 ◽

Vol 188 ◽

pp. 116484

Author(s):

Bingliang Zhang ◽

Chao Shan ◽

Shu Wang ◽

Zhuoyao Fang ◽

Bingcai Pan

Keyword(s):

Organic Matter ◽

Spectral Analysis ◽

Dissolved Organic Matter ◽

Secondary Effluent ◽

Ft Icr Ms ◽

Municipal Secondary Effluent ◽

Ft Icr

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Characterization of dissolved organic matter from Australian and Chinese source waters by combined fractionation techniques

Water Science & Technology ◽

10.2166/wst.2011.432 ◽

2011 ◽

Vol 64 (1) ◽

pp. 171-177 ◽

Cited By ~ 3

Author(s):

Qunshan Wei ◽

Rolando Fabris ◽

Christopher W. K. Chow ◽

Changzhou Yan ◽

Dongsheng Wang ◽

...

Keyword(s):

Organic Matter ◽

Dissolved Organic Matter ◽

High Performance ◽

Size Exclusion ◽

Rapid Urbanization ◽

Molecular Weights ◽

Treatment Processes ◽

Exclusion Chromatography ◽

Urbanization In China ◽

Source Waters

The character of dissolved organic matter (DOM) in source waters from two countries (Australia and China) was investigated using an extended fractionation technique by combining resin adsorption, ultrafiltration and high performance size exclusion chromatography. There are distinctive chemical characteristics associated with DOM origins. Australian sourced DOM had higher hydrophobic acid (HoA) content and exhibited a more pronounced humic character, indicating a higher influence from allochthonous organics (decayed plant bodies from vegetated catchments). The higher content of hydrophobic base and neutral components found in Chinese DOM, may be attributed to the effects of increasing pollution caused by the rapid urbanization in China. The molecular weights (MWs) of aquatic HoA are predominantly in the moderate (e.g. 1–10 kDa) or small (e.g. <1 kDa) ranges. This suggests that aquatic HoA should not be assumed as high MW organics without experimental validation. It is also found that some of the low MW compounds in our samples were hydrophobic, which could explain the observation of low MW organic compounds being able to be removed by conventional treatment processes.

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