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Potential of a static magnetic field to inhibit filamentous sludge bulking in activated sludge process

Zaidi, Nur Syamimi and Muda, Khalida and Sohaili, Johan and Hussein, Norelyza and Liew, Wai Loan and Sillanpää, Mika (2019) Potential of a static magnetic field to inhibit filamentous sludge bulking in activated sludge process. Journal of Environmental Engineering (United States), 145 (3). 04019001-04019001. ISSN 0733-9372

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Official URL: http://dx.doi.org/10.1061/(ASCE)EE.1943-7870.00015...


Sludge bulking caused by filamentous microorganisms is one of the prevailing operational problems in activated sludge process. Its severity is determined by the relative abundance of filamentous microorganisms that prevents the close packing of sludge flocs. This occurrence interferes in the separation and settling activities leading to the failure of the overall treatment process. The severity of bulking has directed to numerous inhibition approaches. However, the approaches have various drawbacks such as high sludge wastage. Hence, operation of a biological reactor by a static magnetic field was attempted. Two sequencing batch reactors (SBR), Reactor A (SBRA) and Reactor B (SBRB), were operated in low dissolved oxygen level to encourage filamentous microorganisms' growth. SBRA was subjected to a magnetic field intensity of 88.0 mT, while SBRB served as the control system. The findings showed that sludge flocs in SBRA were positively developed, corresponding to a lower sludge volume index (SVI) of less than 10 mL/g. Magnetically exposed activated sludge also showed less possibility on the presence of filamentous microorganisms compared with unexposed sludge. These evidences confirmed that use of magnetic field is feasible to inhibit filamentous sludge bulking occurrence.

Item Type:Article
Uncontrolled Keywords:Activated sludge, Static magnetic field
Subjects:T Technology > TA Engineering (General). Civil engineering (General)
Divisions:Civil Engineering
ID Code:88641
Deposited By: Widya Wahid
Deposited On:15 Dec 2020 18:35
Last Modified:15 Dec 2020 18:35

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