Unveiling the transformation and bioavailability of dissolved organic matter in contrasting hydrothermal vents using fluorescence EEM-PARAFAC

Yang, Liyang; Zhuang, Wei; Chen, Chen‐Tung Arthur; Wang, Bing-Jye; Kuo, Fu‐Wen

doi:10.1016/j.watres.2017.01.001

Cited by 62 publications

(9 citation statements)

References 51 publications

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“…The EEM fluorescence spectra of feed water were measured with the result shown in Figure . The response areas include Zones T, B, C, and A, where substances in Zone T represent biological product, that is, tryptophan, substances in Zone B represent proteins, that is, tyrosine, substances in Zone C represent humic‐like substance, and substances in Zone A represent fulvic acid based on previous studies (Huang, Chu, Dong, Hu, & Yu, ; Li, Dong, Liu, & Chu, ; Yang, Zhuang, Arthur Chen, Wang, & Kuo, ). Thus, the Tai Lake water includes tryptophan, tyrosine, and humic substances, etc., that represents the typical surface water.…”

Section: Resultsmentioning

confidence: 99%

Application of coagulation‐ultrafiltration‐nanofiltration in a pilot study for Tai Lake water treatment

Liang

Zhang

Gui

et al. 2019

Water Environment Research

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In this study, the inline coagulation was combined with ultrafiltration and nanofiltration (UF‐NF) in a pilot study for Tai Lake water treatment. The results showed that the combination process was very effective for Tai Lake water treatment in terms of organic removal and membrane fouling control. With inline coagulation, no irreversible membrane fouling was observed for either UF or NF at fluxes of 65–90 and 22–26 L/(m2 hr), respectively. The membrane foulants were analyzed, and the results indicated that the low molecular weight fractions in the feed were main membrane fouling contributors for both UF and NF, where hydrophilic substances and proteins, as well as neutral substances and humic acids with polycarboxyl groups, contributed significantly to UF and NF membrane fouling, respectively. Compared with direct UF‐NF filtration without coagulation, the coagulants could aggregate organic micromolecules for cake formation. With inline coagulation, the moving flocs could generate shear stress to scrub the membrane surface for fouling control of UF. Moreover, with inline coagulation, the organics removal efficiency could be further increased by 10%–20%. With NF, the permeate had a TOC concentration of less than 0.5 mg/L, satisfying the drinking water quality. Therefore, the coagulation‐UF‐NF is very useful for Tai Lake water treatment. Practitioner points Inline coagulation‐UF‐NF for Tai Lake Water treatment is implemented. Inline coagulation can aggregate hydrophilic substances to reduce membrane fouling. Moving flocs produce shear stress for fouling control of UF‐NF. Superior quality of permeate is achieved with the combined coagulation‐UF‐NF process.

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Section: Resultsmentioning

confidence: 99%

Application of coagulation‐ultrafiltration‐nanofiltration in a pilot study for Tai Lake water treatment

Liang

Zhang

Gui

et al. 2019

Water Environment Research

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“…If dissolved Fe bound to organic ligands causes extensive vertical and lateral transport of dissolved Fe in the abyssal Indian Ocean, there is a possibility that FOM370/440 could also be affected by the hydrothermal vents, because humic-like FDOM is likely a major Fe-binding organic ligand in the dark ocean ( Laglera and van den Berg, 2009 ; Yamashita et al, 2020 ). A few studies indicate that hydrothermal systems act as a sink of DOM ( Hawkes et al, 2016 ; Yang et al, 2017 ), while some studies indicate that the systems behave as a source of DOM ( Yang et al, 2012 ; Sarma et al, 2018 ). In this study, the regions were not found where both turbidity and FOM370/440 levels were high along the Leg 2 transect ( Figures 6L , 8A ).…”

Section: Discussionmentioning

confidence: 99%

Determining the Distribution of Fluorescent Organic Matter in the Indian Ocean Using in situ Fluorometry

et al. 2020

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In order to determine the dynamics of marine fluorescent organic matter (FOM) using high-resolution spatial data, in situ fluorometers have been used in the open ocean. In this study, we measured FOM during the Global Ocean Ship-based Hydrographic Investigations Program (GO-SHIP) expedition from early December 2019 to early February 2020, using an in situ fluorometer at 148 stations along the two meridional transects (at ∼80 and ∼57°E) in the Indian Ocean, covering latitudinal ranges from ∼6°N to ∼20°S and ∼30 to ∼65°S, respectively. The FOM data obtained from the fluorometer were corrected for known temperature dependence and calibrated using FOM data measured onboard by a benchtop fluorometer. Using the relative water mass proportions estimated from water mass analyses, we determined the intrinsic values of FOM and apparent oxygen utilization (AOU) for each of the 12 water masses observed. We then estimated the basin-scale relationship between the intrinsic FOM and the AOU, as well as the turnover time for FOM in the Indian Ocean (410 ± 19 years) in combination with the microbial respiration rate in the dark ocean (>200 m). Consistent to previous estimates in the global tropical and subtropical ocean, the FOM turnover time obtained is of the same order of magnitude as the circulation age of the Indian Ocean, indicating that the FOM is refractory and is a sink for reduced carbon in the dark ocean. A decoupling of FOM and AOU from the basin-scale relationship was also observed in the abyssal waters of the northern Indian Ocean. The local variability may be explained by the effect of sinking organic matter altered by denitrification through the oxygen-deficient zone on enhanced abyssal FOM production relative to oxygen consumption.

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“…In this study, the bottom DO replenishment was hampered vertically by summertime thermohalocline and horizontally by weak water movement. Mariculture activities amplified hypoxia by enhancing downward flux of organic matter, whose microbial decomposition consumes DO in water column (e.g., Wang et al, 2016;Su et al, 2017;Yang et al, 2017). The DO depletion is usually expressed as AOU.…”

Section: Bottom Hypoxia and Aoumentioning

confidence: 99%

“…Although degradation of particulate organic matter has been reported to be the dominant factors contributing to the formation of hypoxia and concurrent acidification (Wang et al, 2016;Su et al, 2017), the consumption of oxygen by labile dissolved organic matter (DOM) is also not negligible. A fraction of DOM is biolabile depending on its sources and transport or transformation history (Yang et al, 2017). Thus, to clarify the origin of DOM (river runoff, discharge of sewage, or in situ production) is an important prerequisite to quantify the contribution of DOM to the consumption of oxygen.…”

Section: Introductionmentioning

confidence: 99%

Origin and Dynamics of Dissolved Organic Matter in a Mariculture Area Suffering From Summertime Hypoxia and Acidification

et al. 2018

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Based on six cruises from March to September in 2016, we investigated monthly distributions of dissolved organic matter (DOM) and ancillary water chemistry parameters in a mariculture area in the Northern Yellow Sea, where summertime hypoxia and seawater acidification were observed. The most severe oxygen depletion (hypoxia covered approximately one-third of the aquaculture area) and the largest pH decrease (8.07 ± 0.05 in surface layer vs. 7.66 ± 0.07 in bottom layer) were revealed in August. Concentration of dissolved organic carbon (DOC) and the absorption properties of chromophoric DOM (CDOM) were used to characterize DOM. Results showed that DOM mainly originated from marine in situ processes. In March, a DOM pool with the lowest DOC concentration of 211 ± 23 µmol L −1 and nearly uniform optical characteristics were presented in the well-mixed water column. In August, however, DOC increased to 361 ± 29 µmol L −1 in the surface layer and 342 ± 25 µmol L −1 in the bottom layer. Two non-linear relationships between the absorption coefficient at 355 nm [a CDOM (355)] and the absorption spectral slope over 275-295 nm (S 275−295) were revealed. According to modeling results, the non-linear relationships were mostly caused by the conservative mixing of a refractory CDOM pool with a freshly produced CDOM pool. Apparent oxygen utilization in August was positively related to DOC, but not to a CDOM (355) and S 275−295 , presumably due to multiple sources of CDOM in bottom waters. Both a CDOM (355) and S 275−295 respond largely to decreasing pH; however, they would be less affected by ocean acidification since this process leads to a limited pH decline.

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Unveiling the transformation and bioavailability of dissolved organic matter in contrasting hydrothermal vents using fluorescence EEM-PARAFAC

Cited by 62 publications

References 51 publications

Application of coagulation‐ultrafiltration‐nanofiltration in a pilot study for Tai Lake water treatment

Application of coagulation‐ultrafiltration‐nanofiltration in a pilot study for Tai Lake water treatment

Determining the Distribution of Fluorescent Organic Matter in the Indian Ocean Using in situ Fluorometry

Origin and Dynamics of Dissolved Organic Matter in a Mariculture Area Suffering From Summertime Hypoxia and Acidification

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