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 Technoljournal_title
Bioresource technologyauthors
Ni SQ,Ni J,Yang N,Wang Jdoi
10.1016/j.biortech.2013.06.041subject
Has Abstractpub_date
2013-09-01 00:00:00pages
555-61eissn
0960-8524issn
1873-2976pii
S0960-8524(13)00960-7journal_volume
143pub_type
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