Optimization of activated sludge physical properties by magnetic field via response surface modeling

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

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

9 Citations (Scopus)


In this study, activated sludge was exposed by magnetic field exhibited from NdFeB - type of permanent magnets. The exposure was aimed to improve the physical properties of the activated sludge used in treating wastewater. Hence, it was hypothesized that the magnetically-exposed activated sludge is potential in enhancing the efficiency of removal performances of the wastewater treatment processes. The influence of magnetic field, exposure time, biomass concentration and mixing intensity on turbidity reduction, aggregation and settling velocity was thoroughly investigated. Response surface methodology (RSM) was applied for experimental design, analysis and optimization. Based on the results, magnetically-exposed activated sludge displayed certain trends showing that its properties were positively affected by magnetic field. At the optimum conditions of magnetic field of 88.0 mT, exposure time of 38.5 hrs, biomass concentration of 3380 mg/L and mixing intensity of 345 rpm achieved 68.3%, 60.1% and 0.0104 cm/s of turbidity reduction, aggregation and settling velocity, respectively.

Original languageEnglish
Title of host publicationStructural, Environmental, Coastal and Offshore Engineering
PublisherTrans Tech Publications Ltd
Number of pages6
ISBN (Print)9783038351238
Publication statusPublished - 2014
Externally publishedYes

Publication series

NameApplied Mechanics and Materials
ISSN (Print)1660-9336
ISSN (Electronic)1662-7482


  • Activated sludge
  • Magnetic field
  • Physical properties
  • RSM
  • Wastewater treatment

ASJC Scopus subject areas

  • General Engineering


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