Reduction of Excess Sludge by Magneto‐Ferrite Treatment: Observation on Lab Scale WWTPs

Kabir, Mahmudul; Suzuki, Masafumi; Yoshimura, Noboru

doi:10.1002/tee.20449

Cited by 8 publications

(16 citation statements)

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“…These plants have a reservoir for influent, an aeration tank and a settling tank in each system. It is shown in Figure 3(a) [11][12]. A pump is used to supply the artificial wastewater to the aeration tank.…”

Section: Methodsmentioning

confidence: 99%

“…Ferrite particles were produced in a local factory of Akita. The characteristics of ferrite particles can be found in previous papers [11][12]. They are round shaped and made by spray dryer method.…”

Section: Methodsmentioning

confidence: 99%

“…Magnetoferrite effect was applied for about 4 weeks in the case of CAS and found about 42% of excess sludge reduction with magneto-ferrite treatment of sludge comparing to the non-treated sludge. For EA method, it was continued for about 10 weeks and found no significant evidence of excess sludge in the treated aeration tank [12]. These two types of running processes for the WWTPs proved the effectiveness of the magneto-ferrite system in order to reduce the excess sludge in the laboratory level tests.…”

Section: Introductionmentioning

confidence: 90%

“…We have developed a new process to minimize the production of excess sludge with the ferrite particles. This magneto-ferrite method was explained in other papers [11,12]. Ferrite particles are kept with activated sludge in a test tube and the test tube is exposed to the magnetic flux.…”

Section: Introductionmentioning

confidence: 99%

“…Collisions occurred with ferrite particles and sludge which may lead to the cell lysis. The two miniature WWTPs were run for a fixed period of time with CAS and EA process [11,12]. Magnetoferrite effect was applied for about 4 weeks in the case of CAS and found about 42% of excess sludge reduction with magneto-ferrite treatment of sludge comparing to the non-treated sludge.…”

Section: Introductionmentioning

confidence: 99%

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Reduction of Excess Activated Sludge by Ferrite Particles:Methods for Practical Use

Kabir

Suzuki

Yoshimura

2010

Int.J.Soc.Mater.Eng.Resour.

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Activated sludge method is widely being used for wastewater treatment in many countries including Japan. This method is very useful, as its running cost is very cheap. However, every year a large amount of excess sludge is being produced in the Waste Water Treatment Plants (WWTPs) which is a serious problem in terms of both economical and environmental. So, the experiments on reduction of excess sludge are carried out in many countries.We have introduced Magneto-ferrite treatment on activated sludge in order to reduce excess sludge in the laboratory scale. This magneto-ferrite treatment is a new approach for reduction of excess sludge by using ferrite particles and permanent magnets. A rotary treatment plant was introduced which showed good possibilities of this method for applying it in the practical WWTPs. The parameters of the method were determined. Two miniature WWTPs were used at the laboratory, where one was run with magneto-ferrite treatment while another was run without any treatment. The observations showed good results in reduction of excess sludge growth. The growth of excess sludge was controlled at 72% comparing to that of non-treatment system running WWTPs with CAS. The results showed good possibilities of reducing sludge in the area of biological wastewater treatment.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Reduction of Excess Activated Sludge by Ferrite Particles:Methods for Practical Use

Kabir

Suzuki

Yoshimura

2010

Int.J.Soc.Mater.Eng.Resour.

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Excess activated sludge reduction by using electromagnets and ferrite particles

Kabir

Suzuki

Yoshimura

2011

IEEJ Transactions Elec Engng

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Every year, the ratio of the sewarage treatment to population is increasing in Japan. Expansion in sewer networks is leading to the production of excess sludge which is one of the major problems in wastewater treatment plants. There are several approaches to treat the excess activated sludge. A new approach is to reduce excess sludge production by using magneto‐ferrite treatment. The Suzuki Lab of Akita University, Japan, is working on this project. We have succeeded in using magneto‐ferrite treatment in the lab scale to reduce sludge production. Ferrite particles and magnets are used in this method. Ferrite particles are nontoxic and safe for biological systems. They can be easily separated from the sludge by using magnets. However, the movement of the ferrite particles in the sludge is controlled by permanent magnets which can be made more effective by changing to electromagnets. In this paper, we describe an approach to use electromagnets instead of permanent magnets. Electromagnets can be controlled easily with an AC power supply. The results of our experiments have shown a good possibility for reduction of excess sludge. © 2011 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

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