Treatment of municipal wastewater by a magnetic activated sludge device

Zhi-mei, Liu; Liang, Zhen; Wu, Shengjun; Liu, Feng

doi:10.1080/19443994.2013.848416

Cited by 20 publications

(14 citation statements)

References 26 publications

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“…It does not increase in proportion with the increase in the intensity of the magnetic field (magnetic induction). The large amount of MWT data, their volatility and practical relevance [Koshoridze, et al, 2014;Lipus, et al, 2013;Kozic, et al, 2010;Sammer, et al, 2016;Liu, et al, 2015;Seyfi, et al, 2017;Al-Ogaidi, et al, 2017;Szcześ, et al, 2011;Rashid, et al, 2013] have led to different hypotheses of the MWT mechanism and can be roughly classified into three groups (see Table 1).…”

Section: Introductionmentioning

confidence: 99%

“…The effects of MWT include the changes in the kinetics of reactions, hydration of solutes, the rate of evaporation, changes in density, strength and surface tension of the aqueous solution [Lipus, et al, 2007;Lipus, et al, 2013;Bali, et al, 2016;Chibowski, et al, 2018;Koshoridze, et al, 2014;Kozic, et al, 2010;Zaidi, et al, 2013;Koksharov, et al, 1990;Bali, et al, 2018;Sammer, et al, 2016;Liu, et al, 2015;Toledo, et al, 2008;Seyfi, et al, 2017;Al-Ogaidi, et al, 2017;Szcześ, et al, 2011;Rashid, et al, 2013]. Such changes in the physicochemical properties of aqueous solutions are caused by the decrease in the energy of H-bonds in the interactions of water molecules…”

Section: Introductionmentioning

confidence: 99%

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Study of the Magnetic Water Treatment Mechanism

et al. 2020

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The main problem of widespread introduction of magnetic water treatment (MWT) in the processes of water and wastewater treatment is the lack of modern research aimed at studying the mechanisms of MWT effects, in particular the influence on the physicochemical properties of aqueous solutions. This study explains the effect of MWT taking into account the physical and chemical properties of aqueous solutions due to the presence of the quantum differences in water molecules. All of the MWT effects are related to the change in the physicochemical properties of aqueous solutions. It is due to the presence of two types of water molecule isomers and their librational oscillations. The result of MWT is a violation of the synchronism of para-isomers vibrations, with the subsequent destruction of ice-like structures due to the receiving of energy from collisions with other water molecules (ortho-isomers). One of the most important MWT effects includes the change in the nature and speed of the physicochemical processes in aqueous solutions by increasing the number of more physically and chemically active ortho-isomers. The MWT parameters specified in the work allow explaining the nature of most MWT effects and require developing the scientific and methodological principles for the implementation of the MWT process and mathematical modeling of the MWT process in the water and wastewater treatment. It can be used in the design of the MWT devices taking into account the constructive and mode parameters of MWT devices.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study of the Magnetic Water Treatment Mechanism

et al. 2020

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“…It is widely used for wastewater treatment. In recent years, the effects of magnetic technology on activated sludge process have been studied [9].…”

Section: Introductionmentioning

confidence: 99%

Potentiality of Magnetic Filtration on Wastewater Treatment with Flyash Media

Singh

Barman

Singh

et al. 2020

Preprint

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Water being one of the most precious resources for the Survival of life is on the verge of depletion and hence various treatment processes to treat wastewater are being researched. Speaking about waste, another solid waste comes into the picture which is available in abundance and easily accessible i.e. “FLY ASH”. Many researches have been done to utilize the fly ash for removal of heavy metal like Arsenic, Cadmium, and Nickle etc. for the past years. This paper is based on the idea of utilization of the magnetic property of the Nano iron particles present in the fly ash as well as the adsorption capacity of the carbon particles present in the fly ash. The magnetic property harnessed by the means of magnetic filtration lead to a decrease in the settlement time of the sludge to 35 seconds in 1000ml of wastewater with a fly ash concentration of 12 g/l. Turbidity removal was 95% in most cases at variable settlement time. The wastewater used for the experiment/study was obtained from an Educational University in Gandhinagar, having various organic and inorganic contents. This sewage water initially having an over range turbidity which was reduced to a limit of 50 to 100 NTU by Fly ash treatment process induced with magnetic filtration. Atomic spectrometric test for Fe+ ions was done and the result obtained has slight decrease in the Fe+ concentration in the treated water. The whole treatment process done by the adopted method lead to a huge decrease of time span for treatment as compared with the standard adopted process for the treatment of sewage water at the university treatment plant.

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“…Typically, these technologies are not cost-effective [9]. On the other hand, the conventional wastewater treatments have different disadvantages, such as use of chemicals and production of sludge, as well as low efficiency in removal of bio-recalcitrant compounds [10]. Heterogeneous photocatalysis is one of the advanced oxidation processes that couples low-energy light with semiconductors acting as photocatalysts and, therefore, it could be considered as sustainable process for the treatment and purification of water and wastewater [11,12].…”

Section: Introductionmentioning

confidence: 99%

Packed Bed Photoreactor for the Removal of Water Pollutants Using Visible Light Emitting Diodes

2019

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A packed bed photoreactor was developed using a structured photocatalyst active under visible light. The packed bed reactor was irradiated by visible light-emitting diodes (LEDs) for the evaluation of photocatalytic activity in the removal of different types of water pollutants. By using a flexible LEDs strip as the external light source, it was possible to use a simple cylindrical geometry for the photoreactor, thereby enhancing the contact between the photocatalyst and the water to be treated. The visible light active structured photocatalyst was composed by N-doped TiO 2 particles supported on polystyrene spheres. Photocatalytic results showed that the almost total methylene blue decolorization was achieved after 120 min of irradiation. Moreover, the developed packed bed photoreactor was effective in the removal of ceftriaxone, paracetamol, and caffeine, allowing it to reach the almost total degradation of the pollutants and a total organic carbon removal above 80% after 180 min of visible light irradiation. of pollutants through the application of conventional lamps as light sources [20]. However, since conventional lamps are expensive in terms of manufacturing, as well as electricity consumption, many studies have been devoted to photocatalytic reactors that exploit the solar spectrum [21].But it is necessary to take into account the many limitations related to solar photoreactors. For example, in a solar compound parabolic collector (CPC), despite the fact that the reactor is formed by small tubes, the area equipped by the parabolic collector for light harvesting is huge. So, the installation of these systems also requires a large area [22] to avoid that the single modules projecting shadows upon each other [23]. Another limitation this kind of system is connected to the use of only direct sunlight [24,25]. Thus, the solar photoreactors do not work efficiently during cloudy days and night time. The recent rapid advances in light-emitting diodes (LEDs) technology have made possible a new frontier for a wide range of lighting applications, including photocatalysis and, consequently, photoreactor design [26,27]. In fact, the energy conversion efficiency of LEDs has increased exponentially in recent years, making them a suitable light source for the design of compact photocatalytic reactors for water and wastewater treatment [28,29], as well as for the removal of hazardous compounds from gaseous streams [30], overcoming the limitations related to the developing of photocatalytic reactors into pilot scale level. With the use of LEDs, the design of photoreactors could be significantly facilitated and, by using a flexible LEDs strip as the external light source, it is possible to use simple cylindrical geometry for photoreactor, thereby enhancing the contact between the photocatalyst and the water to be treated.Moreover, cylindrical geometry for photocatalytic reactors is the most used in solar through collectors [31], and it is the simplest configuration, allowing a possible scale-up of photocatalytic systems for...

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Treatment of municipal wastewater by a magnetic activated sludge device

Cited by 20 publications

References 26 publications

Study of the Magnetic Water Treatment Mechanism

Study of the Magnetic Water Treatment Mechanism

Potentiality of Magnetic Filtration on Wastewater Treatment with Flyash Media

Packed Bed Photoreactor for the Removal of Water Pollutants Using Visible Light Emitting Diodes

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