Magnetic Field Application and its Potential in Water and Wastewater Treatment Systems

Zaidi, Nur Syamimi; Sohaili, Johan; Muda, Khalida; Sillanpää, Mika

doi:10.1080/15422119.2013.794148

Cited by 218 publications

(103 citation statements)

References 131 publications

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“…BaSO 4 and BaSO 4 took 51 ± 2 min and 23.0 ± 0.5 min, respectively. Curiously, BaSO 4 took 30 ± 4 min, indicating that the effect of MF on Ba 2+ (cation) is stronger than that on SO 4 2− (anion) and the colloidal stability of BaSO 4 dispersions was slightly higher than that of BaSO 4 dispersions. In the case of silver chloride insoluble salts, the treatment with MF had no significant effect on the colloidal stability, because dispersions of AgCl, AgCl and AgCl took 24 ± 1 min, 22 ± 1 min and 21 ± 1 min, respectively, to achieve 30% of transmittance.…”

Section: Resultsmentioning

confidence: 91%

“…The transmittance profiles (Fig. 2a) and photographs of dispersions of BaSO 4 and BaSO 4 at t = 0 min (Fig. 2b) and after 60 min (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The type of scales depends on the chemical composition of water, for instance, in oil field formation water the concentration of Ca 2+ , Ba 2+ , Sr 2+ , Fe 2+ , HCO 3 − and SO 4 2− ions is frequently higher than that in seawater [2] and they precipitate at wellbores as sulfate and carbonate insoluble salts. Magnetic treatment of water for preventing or retarding the scale build-up has been applied successfully for more than one century and the most relevant studies have been compiled in excellent reviews about this subject [3,4]. The effect of external magnetic field (MF) on calcium carbonate (CaCO 3 ) scale formation has been extensively studied over the past 30 years.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The effect of magnetic field on ion hydration and sulfate scale formation

Silva

Neto

Petri

2015

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Section: Resultsmentioning

confidence: 91%

“…The transmittance profiles (Fig. 2a) and photographs of dispersions of BaSO 4 and BaSO 4 at t = 0 min (Fig. 2b) and after 60 min (Fig.…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The effect of magnetic field on ion hydration and sulfate scale formation

Silva

Neto

Petri

2015

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…Especially, magnetic fields (MFs) stimulation offers a potentially low-cost and convenient approach to enhance microbial activity, since a static MF can be continuously and conveniently applied to any biosystem without need for extra energy input (Ji et al 2010;Filipic et al 2012). Previous studies have demonstrated that implementation of an appropriate MF could raise microbial activity and accelerate contaminant degradation in wastewater treatment systems Kriklavova et al 2014;Zaidi et al 2014). MFs have also been found to promote bioelectrocatalytic activities of several enzyme assemblies linked to electrodes through accelerating electron transfer at electrode-solution interfaces (Katz et al 2005).…”

Section: Introductionmentioning

confidence: 99%

Application of a weak magnetic field to improve microbial fuel cell performance

Tong

et al. 2015

Ecotoxicology

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Microbial fuel cells (MFCs) have emerged as a promising technology for wastewater treatment with concomitant energy production but the performance is usually limited by low microbial activities. This has spurred intensive research interest for microbial enhancement. This study demonstrated an interesting stimulation effect of a static magnetic field (MF) on sludge-inoculated MFCs and explored into the mechanisms. The implementation of a 100-mT MF accelerated the reactor startup and led to increased electricity generation. Under the MF exposure, the activation loss of the MFC was decreased, but there was no increased secretion of redox mediators. Thus, the MF effect was mainly due to enhanced bioelectrochemical activities of anodic microorganisms, which are likely attributed to the oxidative stress and magnetohydrodynamic effects under an MF exposure. This work implies that weak MF may be applied as a simple and effective approach to stimulate microbial activities for various bioelectrochemical energy production and decontamination applications.

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“…In this method, large gradients are produced in a magnetic field around magnetically susceptible wires. [1] The magnetic force acting on the magnetized particles can be expressed by Equation (1) as follows:…”

Section: Introductionmentioning

confidence: 99%

Feasibility of turbidity removal by high-gradient superconducting magnetic separation

Zeng

Li²,

et al. 2015

Environmental Technology

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Several studies have focused on pollutant removal by magnetic seeding and high-gradient superconducting magnetic separation (HGSMS). However, few works reported the application of HGSMS for treating non-magnetic pollutants by an industrial large-scale system. The feasibility of turbidity removal by a 600 mm bore superconducting magnetic separation system was evaluated in this study. The processing parameters were evaluated by using a 102 mm bore superconducting magnetic separation system that was equipped with the same magnetic separation chamber that was used in the 600 mm bore system. The double-canister system was used to process water pollutants. Analytical grade magnetite was used as a magnetic seed and the turbidity of the simulated raw water was approximately 110 NTU, and the effects of polyaluminum chloride (PAC) and magnetic seeds on turbidity removal were evaluated. The use of more PAC and magnetic seeds had few advantages for the HGSMS at doses greater than 8 and 50 mg/l, respectively. A magnetic intensity of 5.0 T was beneficial for HGSMS, and increasing the flow rate through the steel wool matrix decreased the turbidity removal efficiency. In the breakthrough experiments, 90% of the turbidity was removed when 100 column volumes were not reached. The processing capacity of the 600 mm bore industry-scale superconducting magnetic separator for turbidity treatment was approximately 78.0 m(3)/h or 65.5 × 10(4) m(3)/a. The processing cost per ton of water for the 600 mm bore system was 0.1 $/t. Thus, the HGSMS separator could be used in the following special circumstances: (1) when adequate space is not available for traditional water treatment equipment, especially the sedimentation tank, and (2) when decentralized sewage treatment HGSMS systems are easier to transport and install.

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Magnetic Field Application and its Potential in Water and Wastewater Treatment Systems

Cited by 218 publications

References 131 publications

The effect of magnetic field on ion hydration and sulfate scale formation

The effect of magnetic field on ion hydration and sulfate scale formation

Application of a weak magnetic field to improve microbial fuel cell performance

Feasibility of turbidity removal by high-gradient superconducting magnetic separation

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