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Influence of magnetic field on activity of given anaerobic sludge

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Abstract

Two modes of magnetic fields were applied in the Cr6+ removal sludge reactors containing two predominated strains—Bacillus sp. and Brevibacillus sp., respectively. The magnetic field mode I* of 0–4.5 or 0–14 mT between pieces was obtained by setting the magnetic pieces with the surface magnetic density of 0–6 or 0–20 mT into the reactor, and the magnetic field mode II* of 6, 20, or 40 mT on the return line was obtained by controlling the working distance of the permanent magnet outside the sludge return line. The effects of different magnetic fields on the activity of the given anaerobic sludge were studied by comparing with the control (absent of magnetic field). The results showed that the magnetic field of 0–4 mT improved the activity of given sludge most effectively, \( U_{{\max \cdot {\text{CH}}_{4} }} \) (the peak methane-producing rate) and the methane producing volume per gCODCr reached 64.3 mlCH4/gVSS.d and 124 mlCH4/gCODCr, which increased by 20.6 and 70.7%, respectively, compared with the control. And the magnetic field of 20 mT took second place. It could be concluded that the input of some magnetic field could improve the activity of anaerobic sludge by increasing the transformation efficiency of CODCr matters to methane, and the total organic wastage did not increase.

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Abbreviations

CODCr :

Chemical oxygen demand

CH4 :

Methane

MLSS:

Mixed liquor suspended solids (mg/l)

(ML)VSS:

Mixed liquor volatile suspended solids (mg/l)

SVI:

Sludge volume index (ml/g)

SV30 :

Sludge volume (%)

cfu:

Colony forming unit

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Authors and Affiliations

  1. Faculty of Environmental Science and Engineering, Guangdong University of Technology, 510006, Guangzhou, China

    Y. B. Xu, X. J. Duan, J. N. Yan, Y. Y. Du & S. Y. Sun

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  1. Y. B. Xu
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  2. X. J. Duan
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  3. J. N. Yan
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  4. Y. Y. Du
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  5. S. Y. Sun
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Corresponding author

Correspondence to Y. B. Xu.

Additional information

Project (No. 40801194) supported by a Grant from Nature Science fund of China; Project (No. 0500823) supported by a Grant from Nature Science fund of Guangdong Province, China.

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Xu, Y.B., Duan, X.J., Yan, J.N. et al. Influence of magnetic field on activity of given anaerobic sludge. Biodegradation 20, 875–883 (2009). https://doi.org/10.1007/s10532-009-9275-x

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  • DOI: https://doi.org/10.1007/s10532-009-9275-x

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