Eutrophication-Driven Hypoxia in the East China Sea off the Changjiang Estuary

Wang, Hongjie; Dai, Minhan; Liu, Jinwen; Kao, Shuh‐Ji; Zhang, Chao; Cai, Wei‐Jun; Wang, Guizhi; Qian, Wei; Zhao, Meixun; Sun, Zhenyu

doi:10.1021/acs.est.5b06211

Cited by 193 publications

(170 citation statements)

References 72 publications

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“…(cyanobacteria) had been found to be responsible for 2-MIB production (Sun et al, 2013). However, the musty odor intensity increased significantly in this study, suggesting that the activity of odor producing cyanobacteria might be increased Wang et al, 2016).…”

Section: Mitigation Of the Septic And Musty Odorscontrasting

confidence: 51%

Simultaneous removal of multiple odorants from source water suffering from septic and musty odors: Verification in a full-scale water treatment plant with ozonation

Guo

Yang

et al. 2016

Water Research

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a b s t r a c tOzonation is known to be very effective in the removal of odorants from source water. However, it is not known if ozonation is effective in the removal of multiple odorants causing different types of odors. In this study, the removal performance for odors and odorants were evaluated in a Water Treatment Plant (WTP), which was equipped with coagulation, sedimentation, ozonation, biological activated carbon (BAC) filtration, sand filtration, and chlorination in succession and located in the downstream of the Huangpu (HP) River, over the period from April, 2014 to April, 2015. Flavor profile analysis (FPA) results showed that the source water was constantly associated with septic and musty odors. Geosmin and 2-MIB, with an average OAV of 4.54 and 1.38, respectively, were the major odorants for musty odor, while bis(2-chloroisopropyl) ether, DEDS and DMDS with an average OAV of 2.35, 1.65 and 0.78, respectively, might be responsible for the septic odor. While the musty odor could be removed effectively through the combination of ozonation and BAC, the septic odor and associated odorants required further treatment with sand filtration and chlorination for complete removal. It is clear that the advanced treatment process was effective for the treatment of source water containing complicated odorants. It should be noted that the sedimentation process needs careful management because release of odorants may occur during the treatment. The result of this study will be helpful for the mitigation of odors in WTP using source waters suffering from complicated odor problems.

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Section: Mitigation Of the Septic And Musty Odorscontrasting

confidence: 51%

Simultaneous removal of multiple odorants from source water suffering from septic and musty odors: Verification in a full-scale water treatment plant with ozonation

Guo

Yang

et al. 2016

Water Research

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“…Unlike lakes and estuaries, hypoxia and anoxia in river water are driven by catchment inflows and stratification (Scicluna et al, 2015). Seasonal hypoxia in shallow rivers may be induced by pollution inputs, seasonal rainfall, and temperature (Wang et al, 2016). In the Niuwei River, the DO concentrations in surface water varied by ±0.73 mg L −1 .…”

Section: Tablementioning

confidence: 99%

Do NH 3 and chemical oxygen demand induce continuous release of phosphorus from sediment in heavily polluted rivers?

Zhang

Jin

Zhu

et al. 2017

Ecological Engineering

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a b s t r a c tWhile phosphorus (P) is a vital element in freshwater systems, excessive P loads will induce eutrophication. Large inputs of various pollutants, including P, to rivers in semi-arid regions result in complex environmental problems. In this study, we investigate dissolved oxygen (DO), ammoniacal nitrogen (NH 3 ), chemical oxygen demand (CODcr), soluble reactive P (SRP) in surface water and pore water, and sediment P in the Niuwei River, within the Hai River Basin. From our results we developed and tested a theory for P release in semi-arid regions driven by DO. The results show that NH 3 and CODcr can cause variations in DO in surface water. The presence of pollutants at high concentrations caused seasonal hypoxia. Hypoxic river water induced adsorption and hydrolysis of NaOH-Pi and labile organic P (L-Po), which then resulted in increased SRP concentrations in pore water and surface water. Overall, our results illustrate that NH 3 and CODcr may be important for P adsorption and desorption and for management of water quality problems in rivers in semi-arid regions.

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“…Below the pycnocline, aerobic respiration is usually the predominant sink of oxygen. Organic matter, which consumes dissolved oxygen (DO) as it becomes oxidized, is thus the ultimate cause of hypoxia under favourable physical settings (Rabouille et al, 2008;Rabalais et al, 2014;Qian et al, 2016). The organic carbon (OC) that fuels respiration-driven reduction of oxygen in these systems could originate from either eutrophicationinduced primary production (marine OC; OC mar ) or naturally and/or anthropogenically driven delivery from terrestrial environments (terrestrial OC; OC terr ) (Paerl, 2006;Rabalais et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Tracing the origin of the oxygen-consuming organic matter in the hypoxic zone in a large eutrophic estuary: the lower reach of the Pearl River Estuary, China

Dai

et al. 2017

Biogeosciences

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Abstract. We assess the relative contributions of different sources of organic matter, marine vs. terrestrial, to oxygen consumption in an emerging hypoxic zone in the lower Pearl River Estuary (PRE), a large eutrophic estuary located in Southern China. Our cruise, conducted in July 2014, consisted of two legs before and after the passing of Typhoon Rammasun, which completely de-stratified the water column. The stratification recovered rapidly, within 1 day after the typhoon. We observed algal blooms in the upper layer of the water column and hypoxia underneath in bottom water during both legs. Repeat sampling at the initial hypoxic station showed severe oxygen depletion down to 30 µmol kg −1 before the typhoon and a clear drawdown of dissolved oxygen after the typhoon. Based on a three endmember mixing model and the mass balance of dissolved inorganic carbon and its isotopic composition, the δ 13 C of organic carbon remineralized in the hypoxic zone was −23.2 ± 1.1 ‰. We estimated that 65 ± 16 % of the oxygen-consuming organic matter was derived from marine sources, and the rest (35 ± 16 %) was derived from the continent. In contrast to a recently studied hypoxic zone in the East China Sea off the Changjiang Estuary where marine organic matter dominated oxygen consumption, here terrestrial organic matter significantly contributed to the formation and maintenance of hypoxia. How varying amounts of these organic matter sources drive oxygen consumption has important implications for better understanding hypoxia and its mitigation in bottom waters.

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Eutrophication-Driven Hypoxia in the East China Sea off the Changjiang Estuary

Cited by 193 publications

References 72 publications

Simultaneous removal of multiple odorants from source water suffering from septic and musty odors: Verification in a full-scale water treatment plant with ozonation

Simultaneous removal of multiple odorants from source water suffering from septic and musty odors: Verification in a full-scale water treatment plant with ozonation

Do NH 3 and chemical oxygen demand induce continuous release of phosphorus from sediment in heavily polluted rivers?

Tracing the origin of the oxygen-consuming organic matter in the hypoxic zone in a large eutrophic estuary: the lower reach of the Pearl River Estuary, China

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