title: [Effects of Nitrate and CH4 on Anaerobic Oxidation of BETX in Landfill Cover Soils].
abstract: BETX is one of the important components of stink organic gases in landfills, which simultaneously release much of greenhouse CH4. The microorganisms in landfill cover soils are able to degrade CH4 and BETX. Therefore, improving the capacity of biological oxidation of microorganisms in landfill cover soils can effectively reduce and control pollution caused by landfill gases. Some electron acceptors can couple to anaerobic oxidation of methane and some organic pollutants, thus eliminating methane and organic substances. Based on the above theory, this research investigated the effect of nitrate (NO3-) and CH4 on anaerobic degradation of benzene series (toluene, xylene and isopropyl benzene) with coexistence of SO4(2-) in landfill cover soils through static incubation experiment. The results showed that BTEX inhibited the degradation of CH4 without adding nitrate, however, BTEX instead improved the removal of CH4 after nitrate addition. Although single addition of nitrate or CH4 could improve the removal of BTEX in landfill cover soils, adding both of them could improve the removal of BTEX better as the removal efficiencies for benzene, toluene and isopropyl benzene were respectively reached 65%, 88% and 82%, much higher than those of 53%, 76% and 31% when not adding nitrate and CH4. The process of anaerobic methane oxidation coupled to nitrate reduction was able to synchronously improve anaerobic oxidation of BETX.
authors: Rong
authors: R
authors: Liu
authors: Yan
authors: Y
authors: Long
authors: Li-li
authors: LL
authors: Wang
authors: Ting
authors: T
authors: He
authors: Jin-shao
authors: JS
authors: Ye
mesh_terms: D001554:Benzene; D005740:Gases; D008697:Methane / Q000737:chemistry*; D009566:Nitrates / Q000737:chemistry*; D010084:Oxidation-Reduction; D012987:Soil / Q000737:chemistry*; D014050:Toluene; D064091:Waste Disposal Facilities; D014992:Xylenes
chemical_list: D005740:Gases; D009566:Nitrates; D012987:Soil; D014992:Xylenes; D014050:Toluene; D001554:Benzene; D008697:Methane