Effect of magnetic nanoparticles on the performance of activated sludge treatment system.

Abstract:

:Both short-term and long-term exposure experiments were carried out to investigate the influence of magnetic nanoparticles (NPs) on activated sludge. The short-term presence of 50-200 mg/L of NPs decreased total nitrogen (TN) removal efficiencies, resulted from the acute toxicity of a shock load of NPs. However, long-term exposure of 50 mg/L magnetic NPs were observed to significantly improve TN removal efficiency, partially due to the self-repair function of activated sludge and magnetic-induced bio-effect. Sludge properties and extracellular polymer substrates secretion were affected. Additional investigations with enzyme and FISH assays indicated that short-term exposure of 50 mg/L magnetic NPs led to the abatement of nitrifying bacteria. However, the activities of the enzyme nitrite oxidoreductase and key denitrifying enzymes were increased after long-term exposure.

journal_name

Bioresour Technol

journal_title

Bioresource technology

authors

Ni SQ,Ni J,Yang N,Wang J

doi

10.1016/j.biortech.2013.06.041

subject

Has Abstract

pub_date

2013-09-01 00:00:00

pages

555-61

eissn

0960-8524

issn

1873-2976

pii

S0960-8524(13)00960-7

journal_volume

143

pub_type

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