A novel Pseudomonas gessardii strain LZ-E simultaneously degrades naphthalene and reduces hexavalent chromium

• DOI: 10.1016/j.biortech.2016.02.015
• Publication Date: 2016-02-13T02:24:41Z
• Authors: Haiying Huang; Kejia Wu; Aman Khan; Yiming Jiang; Zhenmin Ling; Pu Liu; Yong Chen; Xuanyu Tao; Xiangkai Li
• Keywords: Chromium; Environmental Engineering; Naphthalene degradation; P. gessardii LZ-E; Bioengineering; Combined pollution remediation; Naphthalenes; Wastewater; 01 natural sciences; 6. Clean water; Biodegradation, Environmental; Cr(VI) reduction; 13. Climate action; Pseudomonas; Polycyclic Aromatic Hydrocarbons; Waste Management and Disposal; Phylogeny; 0105 earth and related environmental sciences

Combined pollutants with polycyclic aromatic hydrocarbons (PAHs) and heavy metals have been identified as toxic and unmanageable contaminates. In this work, Pseudomonas gessardii strain LZ-E isolated from wastewater discharge site of a petrochemical company degrades naphthalene and reduces Cr(VI) simultaneously. 95% of 10mgL(-1) Cr(VI) was reduced to Cr(III) while 77% of 800mgL(-1) naphthalene was degraded when strain LZ-E was incubated in BH medium for 48h. Furthermore, naphthalene promotes Cr(VI) reduction in strain LZ-E as catechol and phthalic acid produced in naphthalene degradation are able to reduce Cr(VI) abiotically. An aerated bioreactor system was setup to test strain LZ-E's remediation ability. Strain LZ-E continuously remediated naphthalene and Cr(VI) at rates of 15mgL(-1)h(-1) and 0.20mgL(-1)h(-1) of 800mgL(-1) naphthalene and 10mgL(-1) Cr(VI) addition with eight batches in 16days. In summary, strain LZ-E is a potential applicant for combined pollution remediation.