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Context 1
... Table 1 shows the raw peat water and its DOM fractions characteristics. The DOC content in tropical peat water is very high due to the high concentration of humic acid, as depicted by its high color content and acidic pH. ...
Context 2
... with ΔA 277 absorbance, the HPOA fraction has the lowest ΔA 277 that is followed by TPH, HPIC, and HPIN fractions. Meanwhile, the DOC concentration shows opposite pattern (Table 1). HPOA fraction as the highest concentration is followed with TPH, HPIC and HPIN fractions. ...

Citations

... Chlorine is a powerful oxidant that can degrade organic compounds rapidly [78]. Chlorine attacks organic matter by electrophilic substitution, which results in the formation of chlorinated DBPs [79]. When bromide is present in water, it can react with chlorine to produce hypobromous acid, which can then result in the formation of brominated DBPs [79]. ...
... Chlorine attacks organic matter by electrophilic substitution, which results in the formation of chlorinated DBPs [79]. When bromide is present in water, it can react with chlorine to produce hypobromous acid, which can then result in the formation of brominated DBPs [79]. The THM4 and HAA5 precursor properties of NP [32] and other organic compound [60] has been reported previously. ...
Article
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The presence of nonylphenol (NP) in bromide-containing water contributed to the formation of regulated disinfection by products (DBPs): trihalomethanes-4 (THM4) and haloacetic acids-5 (HAA5). This study was conducted to determine the impact of ozonation initial pH and UVC-combination process in NP, its precursor properties to THM4 and HAA5, degradation. The UVC-combination process was conducted with standalone UVC, UVC/O3, and photocatalytic ozonation using UVC/O3/TiO2. All the process was conducted for 5, 10, 15, 20, 25, and 30min. The samples that have gone through the UVC-combination process were then chlorinated for 24 h to determine the formation of DBPs. The standalone UVC process was sufficient to degrade NP in water with a removal efficiency of 78.99 %. In addition, the UVC/O3 and UVC/O3/TiO2 process enhances significantly the NP degradation, achieving 91.15 % and 99.15 % respectively. Although the NP was successfully degraded during the UVC-combination process, the formation of THM4 and HAA5 increased significantly. The UVC/O3 process is the best choice in removing the NP and THM4 and HAA5 formation with 84.34 %, 94.27 %, and 62.19 % respectively after 5min irradiation process.
... It is tropical region characterized by high temperatures (33.5 • C) and significant precipitation (1800 mm), experiencing rapid hydrologic cycles. This fast-paced hydrological cycling in the tropical reservoir inevitably change DOM's migration and transform processes, leading to a higher intensity of carbon cycling [11]. The unique climate conditions of Hainan may shape the distinctive characteristics of DOM in tropical reservoirs. ...
Article
Full-text available
Dissolved organic matter (DOM) exerts a crucial role in biogeochemical processes and ascertaining water quality in reservoirs, where it is vulnerable to the dynamic impacts of surface water inflows. However, understanding how DOM quantity and biochemical features responds to hydrodynamic forces in tropical reservoirs remains limited. To enhance our understanding of the vertical profiles of DOM characteristics under varying hydrodynamic forces (strong, moderate, and weak regions) in the Chitian Reservoir (18°43′–18°42′ N, 109°68′–109°70′ E), in December 2023, we investigated the concentrations and biochemical characteristics of water column DOM samples using multispectral techniques, a parallel factor model, and two-dimensional correlation analysis. Our results indicated that DOM concentrations (4.34 ± 0.36 mg/L) are the highest in the reservoir center, whereas total nitrogen (0.52 ± 0.04 mg/L), total phosphorus (0.02 ± 0.03 mg/L), and nitrate nitrogen (1.01 ± 0.07 mg/L) present their highest values in the inlet region. As hydrodynamic force decreases, microbial activity increases, whereas DOM’s humification degree and molecular weight decline. DOM in the Chitian Reservoir comprises humic-like components, including three terrestrial sources (accounting for 85.38%~87.03%) and one microbial source, with dominant characteristics of allochthonous origin. The relative abundance of microbial components decreased from 14.62% to 12.97% with the increasing hydrodynamic force and increased with depth. DOM functional groups in the strong hydrodynamic force region and the reservoir’s upper layer show high consistency and uniformity. Phenolic O–H is the most reactive functional group concerning changes in water depth across all hydrodynamic areas, followed by polysaccharide C–O, owing to its high photoactivity. In contrast, aromatic C–H demonstrates the weakest reactivity. DOM’s spectral features are closely linked to nutrient form concentrations (N and P).