Controlling the source of green tides in the Yellow Sea: NaClO treatment of Ulva attached on Pyropia aquaculture rafts

Liu, Jinlin; Xia, Jing; Zhuang, Minghua; Zhang, Jianheng; Yu, Kefeng; Zhao, Shuang; Sun, Yuqing; Tong, Yanli; Xia, Lihua; Qin, Yuling; He, Peimin; Liu, Wei; Wei-ping, Dai; Xu, Hong

doi:10.1016/j.aquaculture.2021.736378

Cited by 62 publications

(9 citation statements)

References 42 publications

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“…The sodium hypochlorite was added into the seawater solution to obtain the available chlorine at concentrations of 1, 10 and 100 ppm. The available chlorine concentration in seawater was measured using chemical titration according to the reported literature [10]. The pH values of different concentrations of available chlorine: 0 ppm (pH = 7.86), 1 ppm (pH = 7.98), 10 ppm (pH = 8.42), 100 ppm (pH = 9.92).…”

Section: Weight Loss Experimentsmentioning

confidence: 99%

Influence of available chlorine on corrosion behaviour of low alloy marine steel in natural seawater

Liu

Sui

Zhou

et al. 2023

Corrosion Engineering, Science and Technology

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Available chlorine is known to play a significant role in metal corrosion due to its oxidising properties. In this paper, the effect of available chlorine concentration on corrosion behaviour of the low alloy marine steel was investigated by electrochemical and immersion tests. Experimental results show that the corrosion rate of low alloy marine steel is accelerated with the increase of available chlorine concentration in seawater. The localised electrochemical dissolution of the steel is more active with the concentration of available chlorine increasing. Energy dispersive spectroscopy (EDS) was performed to understand the composition of the corrosion products that the large enrichment of Cl element occurred for the high available chlorine concentration (100 ppm) after 720 h exposure to seawater. The influence of available chlorine concentration on mechanical property of low alloy marine steel indicatesthe less impact on the tensile and yield strength of the low alloy marine steel.

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Section: Weight Loss Experimentsmentioning

confidence: 99%

Influence of available chlorine on corrosion behaviour of low alloy marine steel in natural seawater

Liu

Sui

Zhou

et al. 2023

Corrosion Engineering, Science and Technology

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“…According to the Bulletin of China Marine Disaster (2021), the distribution of U. prolifera reached 61,898 km 2 during the "green tide" of 2021, the highest values recorded in history (https://www.mnr.gov.cn/sj/sjfw/hy/gbgg/zghyzhgb/). "Green tides" of U. prolifera have a variety of ecological impacts on natural landscapes and marine life, resulting in imbalances in marine ecosystems (Ye et al, 2011;Le Luherne et al, 2016;Qi et al, 2016;Glibert, 2017;Miao et al, 2018;Chen et al, 2020;Liu et al, 2021). At the end of a "green tide" (late July to early August), a large amount of U. prolifera settles on the seafloor and gradually decomposes.…”

Section: Introductionmentioning

confidence: 99%

Two treatment methods on Ulva prolifera bloom result in distinctively different ecological effects in coastal environment

et al. 2023

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Green tides Ulva prolifera have broken out in the Yellow Sea for more than 10 years, becoming a periodic ecological disaster. The largest-ever green tide that occurred in 2021 promoted innovation in treatment methods. Different from the traditional harvest-disposal method, a microbial complex formulation was firstly sprayed on the harvest U. prolifera that promotes rapid degradation, and then fermented and disposed into the sea. At present, little was known about the ecological effects of those different treatment methods. In order to examine this hypothesis, we run an in-lab incubation of 60 days to simulate the two methods to degrade U. prolifera, with focuses on the degradation ensued impacts on water quality. The degradation process of fresh U. prolifera over two months was dominated by the continuous and slow release of DOM, and the concentration of DOM in the water column was hardly observed to decrease within two months. The pre-discomposed-disposal method also significantly altered microbial community structure. The pre-decomposing treatment with microbial complex formulations destroyed U. prolifera cell tissues and changed its physical state in seawater from floating to fast depositing, and increased the degradation rate by about 14 times. The rapid decomposition of the released bioactive organic matter consumed a substantial amount of dissolved oxygen in local seawater, which has the potential risk of causing local hypoxia and acidification in a short-term. The pre-decomposition treatment of U. prolifera could be a practical and efficient countermeasures to U. prolifera blooming. After the complete degradation of the pre-decomposed U. prolifera, the resulting dissolved organic matter could increase TA to resist acidification. Overall, compared with traditional harvest-packing-disposal method, the pre-decomposing-disposal treatment is an efficient and environmental-friendly disposal method to deal with the U. prolifera “green tide”, but it should be used cautiously.

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“…If the aquatic estuarine system or sea is entropized, Ulva sp. can outgrow other species and become an environmental problem [9][10][11][12]. Thus, to exploit this seaweed species, it is necessary to control carefully the cultivation system so as not to pressure the ecological status of its ecological surroundings [9][10][11]13,14].…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study of the Fatty Acids and Monosaccharides of Wild and Cultivated Ulva sp.

García-Poza

Morais

Leandro

et al. 2022

JMSE

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There is a need to find new possible raw food sources with interesting nutritional values. One of the most unexploited sources are seaweeds. Thus, Ulva sp. is a green edible seaweed that shows a high growth rate in nature and can support drastic abiotic changes, such as temperature and salinity. This work aims to determine the main nutritional compounds, fatty acids (FAs) and monosaccharides profiles of Ulva sp. (collected from Mondego estuary, Portugal), to identify the potential of this seaweed as a food source. The present study also highlights the potential of controlled and semi-controlled cultivation systems in Ulva sp. profiles. The results showed that the controlled cultivation systems had higher essential FA and monosaccharide content than the semi-controlled cultivation systems. However, they are in some cases identical to wild individuals of Ulva sp., supporting that cultivation of Ulva sp. can be a key for food safety. It is crucial to control the associated risks of contamination that can occur in wild specimens.

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Controlling the source of green tides in the Yellow Sea: NaClO treatment of Ulva attached on Pyropia aquaculture rafts

Cited by 62 publications

References 42 publications

Influence of available chlorine on corrosion behaviour of low alloy marine steel in natural seawater

Influence of available chlorine on corrosion behaviour of low alloy marine steel in natural seawater

Two treatment methods on Ulva prolifera bloom result in distinctively different ecological effects in coastal environment

A Comparative Study of the Fatty Acids and Monosaccharides of Wild and Cultivated Ulva sp.

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