Effects of water quality on inactivation and repair of Microcystis viridis and Tetraselmis suecica following medium-pressure UV irradiation

Liu, L.; Chu, Xiaona; Chen, Pengyu; Xiao, Yao; Hu, Jiangyong

doi:10.1016/j.chemosphere.2016.08.027

Cited by 29 publications

(10 citation statements)

References 40 publications

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“…(1)). Different studies found that a high salt concentration may affect the osmotic forces and make the enteric and freshwater organisms less vulnerable to the UV irradiation, whereas marine organisms are not affected . However, the loss of the inactivating efficacy of Escherichia coli (ATCC 11229) treatment due to the salinity is lower in the case of the single‐pass device .…”

Section: Resultsmentioning

confidence: 99%

“…Different studies found that a high salt concentration may affect the osmotic forces and make the enteric and freshwater organisms less vulnerable to the UV irradiation, [53][54][55][56] whereas marine organisms are not affected. 57 However, the loss of the inactivating efficacy of Escherichia coli (ATCC 11229) treatment due to the salinity is lower in the case of the single-pass device. 30 In this sense, treatment with the recirculation device, based on the repetitive application of short doses, promotes the resistance of the organisms to the UV irradiation.…”

Section: Inactivation Of Escherichia Coli (Atcc 11229) and Natural Pomentioning

confidence: 99%

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Comparing the inactivating efficacy of enteric bacteria in seawater treated with different configurations of continuous flow‐through ultraviolet devices: single‐pass and recirculation

Romero-Martínez

Duque-Sarango

Acevedo-Merino

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND Industrial and commercial activities may require seawater disinfection for which ultraviolet (UV) irradiation is a widely used technology. Ultraviolet devices are commonly used in laboratory to evaluate the disinfection efficacy, looking for the highest control of the experimental conditions such as collimated beam reactor or continuous flow reactors with recirculation. However, commercial applications usually require the application of the UV treatment by means of one single pass through the reactor. The objective in this article is to evaluate and compare the efficacy achieved by two different continuous flow systems, i.e. single‐pass and recirculation devices, on bacteria in buffered distilled and seawater matrices. RESULTS Survival data obtained with a single‐pass device followed by disinfection kinetics according to the log‐linear + shoulder model, requiring a dose of 5.87 mJ cm−2 to inactivate one log unit of the initial concentration of the pure strain Escherichia coli ATCC 11229. The survival achieved with a recirculation reactor followed by a biphasic model, required 12.86 mJ cm−2 to inactivate one log unit of the initial concentration and showed loss of efficacy at higher doses. There was substantial loss of the inactivating efficacy in the treatment of bacteria in seawater using the recirculation device. Natural populations of Escherichia coli and Enterococcus sp. were more sensitive to the UV treatment. CONCLUSION According to the obtained data and their comparison with previous experiments in the literature, the single‐pass prototype is a better approach for determining the inactivating efficacy of UV systems, in comparison with collimated beam and recirculation devices. © 2019 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 99%

Section: Inactivation Of Escherichia Coli (Atcc 11229) and Natural Pomentioning

confidence: 99%

Comparing the inactivating efficacy of enteric bacteria in seawater treated with different configurations of continuous flow‐through ultraviolet devices: single‐pass and recirculation

Romero-Martínez

Duque-Sarango

Acevedo-Merino

et al. 2019

J of Chemical Tech & Biotech

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“…To date, a number of treatment processes have been developed to alleviate or remove algal cells from surface water. Broadly, the prevailing methods can be categorized as: (a) physical processes, such as dissolved air floatation (DAF), direct media filtration and membrane filtration [10]; (b) chemical process (both inorganic and organic), such as coagulation/flocculation and pre-oxidation (using chlorine, ozone, permanganate), EOM as flocculation aid [11]; and lastly, (c) electromagnetic irradiation, such as UV irradiated disinfection [12] and ultrasonic irradiation assisted algae removal [13]. However, from the aspect of economic limitations and practical implications, chemical processes have been used conventionally to treat algae enriched water.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Photoactive Anatase TiO2 from Algae Bloomed Surface Water

et al. 2020

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The purpose of the study was to effectively treat algae bloomed water while using a Ti-based coagulant (TiCl4) and recover photoactive novel anatase TiO2 from the flocculated sludge. Conventional jar tests were conducted in order to evaluate the coagulation efficiency, and TiCl4 was found superior compared to commercially available poly aluminum chloride (PAC). At a dose of 0.3 g Ti/L, the removal rate of turbidity, chemical oxygen demand (COD), and total phosphorus (TP) were measured as 99.8%, 66.7%, and 96.9%, respectively. Besides, TiO2 nanoparticles (NPs) were recovered from the flocculated sludge and scanning electron microscope (SEM), energy dispersive X-ray spectroscope (EDX), and X-ray diffraction (XRD) analysis confirmed the presence of only anatase phase. The recovered TiO2 was found to be effective in removing gaseous CH3CHO and NOx under UV-A lamp at a light intensity of 10 W/m2. Additionally, the TiO2 mixed mortar blocks that were prepared in this study successfully removed atmospheric nitrogen oxide (NOx) under UV irradiance. This study is one of the first to prepare anatase TiO2 from flocculated algal sludge and it showed promising results. Further research on this novel TiO2 concerning internal chemical bonds and shift in the absorbance spectrum could explore several practical implications.

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“…Recently, sequential filtration and inactivation process has been recommended as the main technology for ballast water treatment [5]. Among various inactivation processes, ultraviolet (UV) radiation and electrolysis are two excellent technologies [6,7]. UV radiation is a wildly used disinfection technology with high efficiency and safety.…”

Section: Introductionmentioning

confidence: 99%

Simulated Ballast Water Treatment by Electrolysis Process

Wu¹,

Lu²,

Zhang³

et al. 2017

Topics in Civil, Environmental &Amp; Building Engineering (TICEBE)

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To measure the temperature distribution of molten pool in twin-roll strip casting, a new method based on the soft measurement of temperature field and on-line measurement of fixed point temperature was presented. A threedimensional model on coupled turbulent flow and heat transfer, was firstly established. With regard of the four outlets nozzle, the numerical solution of temperature field was achieved and compared with the real time measurement in order to calibrate the model. A function library, thus, is derived and characterized by the relationship between temperature distribution and main features such as the submerged depth of delivery system, casting temperature, contacting arc, roll speed, casting angel, material properties and roll gap. By applying real time adjustment to the function library, this new method may increase the accuracy, reliability and rapidness of the measurement of molten pool temperature field.

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Effects of water quality on inactivation and repair of Microcystis viridis and Tetraselmis suecica following medium-pressure UV irradiation

Cited by 29 publications

References 40 publications

Comparing the inactivating efficacy of enteric bacteria in seawater treated with different configurations of continuous flow‐through ultraviolet devices: single‐pass and recirculation

Comparing the inactivating efficacy of enteric bacteria in seawater treated with different configurations of continuous flow‐through ultraviolet devices: single‐pass and recirculation

Preparation and Characterization of Photoactive Anatase TiO2 from Algae Bloomed Surface Water

Simulated Ballast Water Treatment by Electrolysis Process

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