Variations of DOM quantity and compositions along WWTPs-river-lake continuum: Implications for watershed environmental management

Wang, Yulai; Hu, Yunyun; Yang, Changming; Wang, Qiongjie; Degang, Jiang

doi:10.1016/j.chemosphere.2018.11.037

Cited by 57 publications

(14 citation statements)

References 28 publications

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“…Furthermore, the North Canal River watershed has always been an important drainage channel, and its tributaries receive the e uent of many sewage treatment plants. Twenty four sewage treatment plants on the important tributaries of the North Canal River watershed were investigated by Liu et al,(2018b), and 70% of the water in the tributaries came from the e uent of the sewage treatment plants with a large amount of humic-like components of excitation (400 ~ 450nm) (Wang et al, 2019). As a result, the contribution of anthropogenic humus to DOM in tributaries of the North Canal River watershed can not be ignored.…”

Section: Spatiotemporal Variations Of Dom Compositionmentioning

confidence: 99%

“…This result suggested that the source of DOM was likely both autochthonous and allochthonous sources, but the contribution of autochthonous sources in the tributaries was more prominent. It might due to much endogenous organic matter from the e uent of urban sewage treatment plants discharged into tributaries (Wang et al, 2019). The freshness index (β:α) evaluates the proportion of newborn DOM derived from microorganisms (Wang et al, 2018).…”

Section: Source Apportionment By Uorescence Indices Of the Dommentioning

confidence: 99%

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Spatiotemporal variations of DOM in a typical multi-source watershed in northern China: A fluorescent evidence

Jin

Lin

Liu

et al. 2021

Preprint

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Dissolved organic matter (DOM) in the multi-source watershed is of guiding significance for the comprehensive management and the assessment of sustainable safety of the watershed. We investigated the components and spectral characteristics of DOM in North Canal River as a typical multi-source watershed in northern China for the first time, using three-dimensional excitation-emission matrix and parallel factor analysis (PARAFAC). The relationship between DOM composition and water quality was also discussed. Results showed that the DOM in the North Canal River watershed was mainly composed of two similar humic acid-like components (230, 335/400nm and 260, 360/450nm) and a tryptophan-like component (280/290 ~ 350nm). The intensity of DOM shows obvious seasonal spatiotemporal variations. In terms of time, the relative concentration of DOM in winter is significantly higher than that in other seasons due to the influence of water volume, temperature, and photochemical degradation factors. As for the aspect of space, under the combined effect of land use and multiple sources of pollution, the relative concentration of tryptophan-like in the mainstream was significantly higher than tributaries, while the relative concentration of humic-like components in the tributaries was higher than that in the mainstream. In the North Canal River watershed, the primary sources of DOM are human-derived point sources and agricultural non-point sources in the mainstream, and terrestrial and microbial sources in the tributaries. Moreover, the composition of DOM is significantly related to water quality indicators, especially nitrogen and phosphorus, which shows that DOM can have an indicative impact on the trophic status in the North Canal River. The result of this study may provide an indicative effect and scientific basis for water quality monitoring and pollution controlling in the North Canal River watershed.

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Section: Spatiotemporal Variations Of Dom Compositionmentioning

confidence: 99%

Section: Source Apportionment By Uorescence Indices Of the Dommentioning

confidence: 99%

Spatiotemporal variations of DOM in a typical multi-source watershed in northern China: A fluorescent evidence

Jin

Lin

Liu

et al. 2021

Preprint

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“…However, FPOM sourced by WWTP effluents does not necessarily need to be of high quality. For instance, Wang et al (2018) showed that FPM inputs from a WWTP effluent had a high proportion of humic-like compounds compared to the receiving stream, and that the bioavailability of this material was relatively low. There is also the possibility that high nutrient inputs from the WWTP effluent lead to increased biomass and the production of N-enriched and highly bioavailable FPOM in the Cànoves stream.…”

Section: Quality and Not Quantity Of Streambed Fpm Influences Metabolic Activitymentioning

confidence: 99%

Hydromorphologic Control of Streambed Fine Particle Standing Stocks Influences In-stream Aerobic Respiration

et al. 2021

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Fine particulate organic matter (FPOM) accumulated in streambeds is a major component of organic matter budgets in headwater streams and greatly affects productivity and metabolism of stream communities. The spatiotemporal distribution of benthic FPOM in the stream, as well as its quantity and quality, depend on inputs from different source types. These can be natural such as soils, streambanks and riparian vegetation, or anthropogenic such as effluents from wastewater treatment plants (WWTP). In addition, stream flow is a key driver of FPOM dynamics, which influences the balance between its transport and accumulation in the streambed. Yet, the link between FPOM dynamics and its effects on stream metabolism is still largely unknown. The aim of this study was to investigate the influence of stream channel hydromorphology on water transport and streambed accumulation of fine particulate matter (FPM) (mineral and organic fractions), FPOM (organic fraction) and its quality (characterized by %OM, %C, %N and the C:N molar ratio). In addition, we quantified the metabolic activity associated with FPM at the habitat scale, and its potential contribution to whole-reach ecosystem respiration using the resazurin-resorufin bioreactive tracer as a proxy for aerobic respiration. We also characterized water transport and metabolic activity with combined additions of hydrological and bioreactive tracers at the reach scale. The study was conducted in the Cànoves stream (Catalonia, NE Spain) downstream of a WWTP that contains three reaches that were hydromorphologically modified using bioengineering techniques. Slower local velocities at the habitat scale increased accumulation of FPM, but did not influence the spatial variability of its quality. Instead, FPM quality declined further downstream from the WWTP. Accumulation of FPM did not increase metabolic activity, but higher %OM of FPM and lower C:N ratios favored the microbial metabolic activity efficiency (normalized by the gram of FPM). Reach-scale metabolic activity was higher in reaches with higher water exchange rate and longer relative travel times, highlighting hydromorphology as an important driver of microbial metabolic activity at the reach-scale. This demonstrates that the interplay of hydrologic exchange and residence time in streambed sediments associated with the microbial metabolic activity of FPOM can ultimately influence reach-scale metabolic activity.

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“…Fluorescence regional integration (FRI), a powerful method to determine the volume integral under each region, has been widely utilized to characterize the composition spatiotemporal changes of DOM from various environments, including rivers, wastewaters, and soils (Chen et al, 2003;Xie et al, 2017;Wang et al, 2019). For example, when used with EEM, FRI was successful at distinguishing the decrease of protein-like materials and increase of humic-like materials across the wastewater treatment plant-river-lake continuum (Wang et al, 2019). Also, EEM coupled with a parallel factor (PARAFAC) analysis has been widely used to study the photodegradation of DOM in different aquatic systems (Ishii and Boyer, 2012;Du et al, 2016;Retelletti Brogi et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Photochemical Reactivity of Humic Substances in an Aquatic System Revealed by Excitation-Emission Matrix Fluorescence

et al. 2021

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The photochemical reactivity of humic substances plays a critical role in the global carbon cycle, and influences the toxicity, mobility, and bioavailability of contaminants by altering their molecular structure and the mineralization of organic carbon to CO2. Here, we examined the simulated irradiation process of Chinese standard fulvic acid (FA) and humic acid (HA) by using excitation-emission matrix fluorescence combined with fluorescence regional integration (FRI), parallel factor (PARAFAC) analysis, and kinetic models. Humic-like and fulvic-like materials were the main materials (constituting more than 90%) of both FA and HA, according to the FRI analysis. Four components were identified by the PARAFAC analysis: fulvic-like components composed of both carboxylic-like and phenolic-like chromophores (C1), terrestrial humic-like components primarily composed of carboxylic-like chromophores (C2), microbial humic-like overwhelming composed of phenolic-like fluorophores (C3), and protein-like components (C4). After irradiation for 72 h, the maximum fluorescence intensity (Fmax) of C1 and C2 of FA was reduced to 36.01–58.34%, while the Fmax of C3 of both FA and HA also decreased to 0–9.63%. By contrast, for HA, the Fmax of its C1 and C2 increased to 236.18–294.77% when irradiated for 72 h due to greater aromaticity and photorefractive tendencies. The first-order kinetic model (R2 = 0.908–0.990) fitted better than zero-order kinetic model (R2 = 0–0.754) for the C1, C2, and C3, of both FA and HA, during their photochemical reactivity. The photodegradation rate constant (k1) of C1 had values (0.105 for FA; 0.154 for HA) that surpassed those of C2 (0.059 for FA, 0.079 for HA) and C3 (0.079 for both FA and HA) based on the first-order kinetic model. The half-life times of C1, C2, and C3 ranged from 6.61–11.77 h to 4.50–8.81 h for FA and HA, respectively. Combining an excitation-emission matrix with FRI and PARAFAC analyses is a powerful approach for elucidating changes to humic substances during their irradiation, which is helpful for predicting the environmental toxicity of contaminants in natural ecosystems.

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Variations of DOM quantity and compositions along WWTPs-river-lake continuum: Implications for watershed environmental management

Cited by 57 publications

References 28 publications

Spatiotemporal variations of DOM in a typical multi-source watershed in northern China: A fluorescent evidence

Spatiotemporal variations of DOM in a typical multi-source watershed in northern China: A fluorescent evidence

Hydromorphologic Control of Streambed Fine Particle Standing Stocks Influences In-stream Aerobic Respiration

Photochemical Reactivity of Humic Substances in an Aquatic System Revealed by Excitation-Emission Matrix Fluorescence

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