title: Screening and degradation performances of dominant strains in high-salinity landfill leachate.
abstract: In order to enhance the removal efficiency of chemical oxygen demand (COD) in the high-salinity landfill leachate, the dominant strains were isolated from high-salinity landfill leachate. The dominant strains and bacteria consortium were screened for COD treatment potential using an aerobic COD concentration decrease test. Ten strains, TJ01-TJ10, were isolated, of which six strains TJ02, TJ03, TJ05, TJ06, TJ07, and TJ09 were found to have higher COD removal when the single bacteria were added, all more than 20%. The most effective combination was TJ06 + TJ09; the COD removal efficiency reached 45.57%. 16S rDNA gene sequence analysis revealed that TJ06 and TJ09 belonged to the genus Bacillus. The effects of the dominant bacteria consortium on the high-salinity landfill leachate varied with pH value and the volume fraction of leachate. The COD removal efficiencies maintained higher when the pH value was 6-8 and the volume fractions of leachate were less than 80%. The result also suggested that there is little effect on the growth of TJ06 and TJ09 when the range of Cl(-) concentration is 0-30,000 mg/L.
authors.affiliation: School of Environmental Science and Engineering, Tianjin University, Tianjin, 300072, China.
authors.forename: Li
authors.initials: L
authors.lastname: Guo
authors.forename: Min
authors.initials: M
authors.lastname: Ji
authors.forename: Huiyu
authors.initials: H
authors.lastname: Dong
authors.forename: Yanjie
authors.initials: Y
authors.lastname: Wei
mesh_terms: D001419:Bacteria / Q000145:classification* / Q000302:isolation & purification / Q000378:metabolism*; D001673:Biodegradation, Environmental; D002713:Chlorine / Q000032:analysis; D004275:DNA, Ribosomal / Q000378:metabolism; D006863:Hydrogen-Ion Concentration; D010100:Oxygen / Q000378:metabolism*; D010802:Phylogeny; D012336:RNA, Ribosomal, 16S / Q000235:genetics / Q000378:metabolism; D012037:Refuse Disposal; D054712:Salinity; D055049:Salt Tolerance; D013995:Time; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000378:metabolism*
chemical_list: D004275:DNA, Ribosomal; D012336:RNA, Ribosomal, 16S; D014874:Water Pollutants, Chemical; D002713:Chlorine; D010100:Oxygen