Chemical structures of extra- and intra-cellular algogenic organic matters as precursors to the formation of carbonaceous disinfection byproducts
| Autor: | Lap Cuong Hua, Pei Chung Chen, Ch-Hpin Huang, Jr Lin Lin |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Haloacetic acids
General Chemical Engineering Chemical structure 0208 environmental biotechnology chemistry.chemical_element 02 engineering and technology 010501 environmental sciences 01 natural sciences Industrial and Manufacturing Engineering chemistry.chemical_compound Amide Chlorine medicine Environmental Chemistry Organic chemistry Organic matter 0105 earth and related environmental sciences Substitution reaction chemistry.chemical_classification Aromaticity General Chemistry Nitrogen 020801 environmental engineering chemistry Environmental chemistry medicine.drug |
| Zdroj: | Chemical Engineering Journal. 328:1022-1030 |
| ISSN: | 1385-8947 |
| Popis: | Algal eutrophication in reservoirs is frequently accompanied by a remarkable increase in the concentration of algogenic organic matter (AOM). Because AOM is well-known as an important precursor to disinfection byproducts (DBPs) in drinking water, algal eutrophication poses severe concerns for public health. This study aimed to characterize the chemical properties of AOM from two major origins, i.e. extra- (EOM) and intra-cellular organic matter (IOM), of a commonly found green alga Chlorella sp. as precursors to trihalomethanes (THMs) and haloacetic acids (HAAs). Particularly, the corresponding relation between the chemical functional structure of EOM and IOM and their THM and HAA formation potential (THMFP and HAAFP) was comprehensively investigated. Results show that IOM chiefly comprised of aromatic and other aliphatic protein-like materials (high organic nitrogen content) those have high activity for chlorine substitution (high UV 253 /UV 203 value) due to the high hydroxyl and amide contents in its chemical structures. EOM alternatively exhibited the characteristics of humic- and fulvic-like materials accompanying with high DOC/DON ratio and aromaticity. However, the chemical structure of EOM had a low tendency for chlorine substitution (low UV 253 /UV 203 value); it was also accompanied by a considerable content of carboxylic moisture, which likely resulted in an unfavorable substitution reaction of EOM with chlorine. As a result, the carbonaceous DBP formation potential (C-DBPFP) showed that IOM yielded higher levels of both THMFP and HAAFP than that yielded by EOM. |
| Databáze: | OpenAIRE |
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