Effects of Fe(II) and Fe(III) on the single-stage deammonification process treating high-strength reject water from sludge dewatering.

Abstract:

:Iron (Fe) is often encountered in wastewaters. This study investigated the effects of iron on the single-stage deammonification process treating reject water from sludge dewatering. When Fe(2+) and Fe(3+) concentrations in the influent were below 1.3mg/L and 0.4 mg/L, Fe(2+) incorporation was found to be linearly correlated with NH(4)(+)-N removal. However, the excess Fe(2+) and Fe(3+) drastically deteriorated the deammonification performance. Both of the reactor performance and Fluorescence In Situ Hybridization results suggested higher sensitivity of autotrophic bacteria to iron than heterotrophs, the sequence of which was assessed to anammox bacteria>aerobic ammonium oxidizers>hetetrophic denitrifiers. With the excess existence of iron, extracellular substances were largely released by bacterial cells, which were the likely sites for iron uptake by scanning electron microscope-energy dispersive X-ray analysis. The information provided here would be useful to facilitate the application of deammonification process in the treatment of wastewater including metal iron.

journal_name

Bioresour Technol

journal_title

Bioresource technology

authors

Liu S,Horn H

doi

10.1016/j.biortech.2011.11.125

subject

Has Abstract

pub_date

2012-06-01 00:00:00

pages

12-9

eissn

0960-8524

issn

1873-2976

pii

S0960-8524(11)01736-6

journal_volume

114

pub_type

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