期刊
WORLD JOURNAL OF MICROBIOLOGY & BIOTECHNOLOGY
卷 36, 期 9, 页码 -出版社
SPRINGER
DOI: 10.1007/s11274-020-02915-1
关键词
Bacteria; Enterobacter cloacae; Immobilization; Magnetite Nanoparticles; Petroleum Hydrocarbons; Pseudomonas otitidis; Wastewater Treatment
The study aimed to investigate the efficiency of exogenous bacterial consortium(Enterobacter cloacaeandPseudomonas otitidis) decorated (immobilized) with Fe(3)O(4)Nanoparticles for the treatment of petroleum hydrocarbon-contaminated wastewater. Glycine coated magnetite Nanoparticles (Fe(3)O(4)NPs) were prepared using reverse co-precipitation method and were characterized using X-ray diffraction, transmission and scanning electron microscopy and vibrating sample magnetometer. They were used to decorate exogenous bacterial consortium(Enterobacter cloacaeandPseudomonas otitidis)at 3 different Fe3O4/bacteria ratios (1:1, 1:3 and 3:1 w/w). Bioremediation of oil contaminated wastewater collected from one of the petroleum distribution companies, Alexandria was conducted for 168 h using Fe3O4/bacterial association at the best ratio (3:1) and compared with non-decorated consortium and the indigenous bacteria in the control. Analysis indicated crystalline structure of Fe(3)O(4)NPs with spherical particles (size: 15-20 nm) and superparamagnetic properties. Glycine modified-Fe(3)O(4)exhibited high ability to immobilize bacteria which acquired its magnetic properties. The highest coating efficiency (92%) was achieved at 3:1 Fe3O4/bacteria ratio after 1 h. This ratio positively affected bacterial growth reaching the highest growth rate (5.07 fold higher than the control) after 4 h. The highest removal efficiencies of the total suspended solids (TSS), chemical oxygen demands (COD), oil and grease (O&G) and total petroleum hydrocarbons (TPH) recording 96, 65.4, 83.9 and 85% reaching residual concentrations of 9.5, 598, 99 and 60 mg/l respectively were achieved after 4 h by the Fe3O4-bacteria assembly. Compared with the maximum permissible limits of the tested parameters, TSS residue was highly compiled with its limit (50 mg/l), while COD, O&G and TPH were 7.5, 9.9, and 120-folds higher than their limits (100, 15 and 0.5 mg/l respectively). To the best of our knowledge it is first time to use integratedEnterobacter cloacaeandPseudomonas otitidisconsortium decorated with Fe(3)O(4)NPs for the treatment of petroleum hydrocarbon-contaminated wastewater. The proposed system proved to be a very efficient, economical and applicable for the removal of the included contaminants in very short running time which increases its biotechnological added value.
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