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Alcohol ethoxylate degradation of activated sludge is enhanced by bioaugmentation with Pseudomonas sp. LZ-B.

Abstract：

:An effective bioaugmentation strategy was developed for the removal of alcohol ethoxylates (AEs) from municipal wastewater. An AE-degrading strain, Pseudomonas sp. LZ-B, was isolated from an activated sludge. Strain LZ-B was able to degrade 96.8% of 200 mg/L C12E4 (Brij 30) within 24 h and showed significant biomass increase and removal of total oxygen concentration (TOC). The optimal degradation temperature and pH value were 37 °C and 6.0, respectively. The strain demonstrated greater potential to degrade five different molecular weight AEs within 5 days. HPLC-MS/MS analysis demonstrated that the major metabolites obtained were polyethylene glycol (PEG) and carboxylated AE chains. Activated sludge has a low ability to remove AEs. After inoculation of strain LZ-B into the activated sludge reactor, Strain LZ-B successfully colonized the activated sludge, and AE removal efficiency increased to more than 95% when the hydraulic retention time (HRT) was 10 h. After strain LZ-B cleaved the AE chains, the sludge microbial communities easily removed PEG fragments to facilitate complete biodegradation of AEs. This is the first report describing bioaugmentation to increase AE degradation in an activated sludge system.

journal_name

Ecotoxicol Environ Saf

journal_title

Ecotoxicology and environmental safety

authors

Ji J,Kakade A,Zhang R,Zhao S,Khan A,Liu P,Li X

doi

10.1016/j.ecoenv.2018.11.045

subject

Has Abstract

pub_date

2019-03-01 00:00:00

pages

335-343

eissn

0147-6513

issn

1090-2414

pii

S0147-6513(18)31181-3

journal_volume

169

pub_type

杂志文章

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