Irrigation of stabilized landfill leachate to landfill cover soil is a cost-effective operation for leachate treatment. The contribution of ammonia-oxidizing bacteria (AOB) in the cover soil to CH4 oxidation, however, is unclear, because AOB and methane-oxidizing bacteria (MOB) can co-oxidize CH4 and NH4+-N. Thus, the contribution of AOB and the inhibitory effect of NH4+-N to CH4 oxidation were determined by using an acetylene pretreatment discrimination method. The results showed that the contributions of AOB to CH4 oxidation varied with the soil type and the concentration of NH4+-N addition. The relative contribution of AOB to CH4 oxidation for compost without NH4+-N addition was the highest (65.0%), and was 2.5 and 3.4 times higher than the corresponding values for aged refuse and landfill cover soil, respectively. The inhibitory effect of NH4+-N was enhanced by increasing the concentration of NH4+-N addition for all the soil samples. At equal NH4+-N addition concentrations, the inhibitory effect was always the lowest for the compost sample. The abundances of particulate methane monooxygenase (pmoA) and ammonia monooxygenase (amoA) genes were key factors influencing the CH4 oxidation rate and contribution of AOB to CH4 oxidation. The higher abundance of pmoA and lower abundance of amoA in landfill cover soil could explain the higher CH4 oxidation rate and lower contribution of AOB to CH4 oxidation in this soil type. Meanwhile, the higher contribution of AOB to CH4 oxidation for compost could be attributed to the higher abundance of the amoA gene and lower abundance of pmoA.
AbichouTMahieuKYuanLet al. (2009) Effects of compost biocovers on gas flow and methane oxidation in a landfill cover. Waste Management29: 1595–1601.
2.
BianRSunYLiWet al. (2017) Co-composting of municipal solid waste mixed with matured sewage sludge: The relationship between N2O emissions and denitrifying gene abundance. Chemosphere189: 581–589.
3.
BilgiliMSDemirAVarankG (2012) Effect of leachate recirculation and aeration on volatile fatty acid concentrations in aerobic and anaerobic landfill leachate. Waste Management & Research30: 161–170.
4.
BodelierPLEFrenzelP (1999) Contribution of methanotrophic and nitrifying bacteria to CH4 and NH4+ oxidation in the rhizosphere of rice plants as determined by new methods of discrimination. Applied & Environmental Microbiology65: 1826.
5.
BodelierPLLaanbroekHJ (2004) Nitrogen as a regulatory factor of methane oxidation in soils and sediments. FEMS Microbiology Ecology47: 265–277.
6.
BowmanMSCluneTSSuttonBG (2002) Sustainable management of landfill leachate by irrigation. Water, Air, & Soil Pollution134: 81–96.
7.
ChaiXTonjesDJMahajanD (2016) Methane emissions as energy reservoir: Context, scope, causes and mitigation strategies. Progress in Energy and Combustion Science56: 33–70.
8.
ChantonJAbichouTLangfordCet al. (2011) Observations on the methane oxidation capacity of landfill soils. Waste Management31: 914–925.
9.
CharlotteSPeterKBognerJEet al. (2009) Microbial methane oxidation processes and technologies for mitigation of landfill gas emissions. Waste Management & Research27: 409–455.
10.
ChiZFLuWJWangHT (2015) Spatial patterns of methane oxidation and methanotrophic diversity in landfill cover soils of southern China. Journal of Microbiology and Biotechnology25: 423–430.
11.
ChiemchaisriCChiemchaisriWChittanukulKet al. (2010) Effect of leachate irrigation on methane oxidation in tropical landfill cover soil. Journal of Material Cycles and Waste Management12: 161–168.
12.
CruzFBDlBarlazMA (2010) Estimation of waste component-specific landfill decay rates using laboratory-scale decomposition data. Environmental Science & Technology44: 4722–4728.
13.
De VisscherAThomasDBoeckxPet al. (1999) Methane oxidation in simulated landfill cover soil environments. Environmental Science & Technology33: 1854–1859.
14.
DongHYaoZZhengXet al. (2011) Effect of ammonium-based, non-sulfate fertilizers on CH4 emissions from a paddy field with a typical Chinese water management regime. Atmospheric Environment45: 1095–1101.
15.
DuMPengCWangXet al. (2017) Quantification of methane emissions from municipal solid waste landfills in China during the past decade. Renewable and Sustainable Energy Reviews78: 272–279.
16.
DunfieldPKnowlesR (1995) Kinetics of inhibition of methane oxidation by nitrate, nitrite, and ammonium in a humisol. Applied & Environmental Microbiology61: 3129–3135.
17.
EPA (2013) Global Mitigation of Non-CO2 Greenhouse Gases: 2010–2030. Washington, DC: United States Environmental Protection Agency (EPA).
18.
EvgheniEMikaelPSvenSRet al. (2012) Greenhouse gas emission from covered windrow composting with controlled ventilation. Waste Management & Research30: 155–160.
19.
HeRRuanAJiangCet al. (2008) Responses of oxidation rate and microbial communities to methane in simulated landfill cover soil microcosms. Bioresource Technology99: 7192–7199.
20.
HeRWangJXiaFFet al. (2012) Evaluation of methane oxidation activity in waste biocover soil during landfill stabilization. Chemosphere89: 672–679.
21.
HeYZhaoYZhouGet al. (2011) Field assessment of stratified aged-refuse-based reactor for landfill leachate treatment. Waste Management & Research29: 1294–1302.
22.
Huber-HumerMGebertJHilgerH (2008) Biotic systems to mitigate landfill methane emissions. Waste Management & Research26: 33–46.
IPCC (2013) Climate Change 2013: The Physical Science Basis. Contribution of Working Group I to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge, UK and New York: Cambridge University Press.
25.
KingGMSchnellS (1994) Ammonium and nitrite inhibition of methane oxidation by Methylobacter albus BG8 and Methylosinus trichosporium OB3b at low methane concentrations. Applied & Environmental Microbiology60: 3508–3513.
26.
KolbSKniefCStubnerSet al. (2003) Quantitative detection of methanotrophs in soil by novel pmoA-targeted real-time PCR assays. Applied & Environmental Microbiology69: 2423–2429.
27.
LiWSunYBianRet al. (2017) N2O emissions from an intermittently aerated semi-aerobic aged refuse bioreactor: Combined effect of COD and NH4(+)-N in influent leachate. Waste Management69: 242–249.
28.
LimpiyakornTSonthiphandPRongsayamanontCet al.(2011) Abundance of amoA genes of ammonia-oxidizing archaea and bacteria in activated sludge of full-scale wastewater treatment plants. Bioresource Technology102: 3694.
29.
LongYYLiaoYMiaoJYet al.(2014) Effects of ammonia on methane oxidation in landfill cover materials. Environmental Science and Pollution Research International21: 911–920.
30.
LouZCaiB-FZhuNet al. (2017) Greenhouse gas emission inventories from waste sector in China during 1949–2013 and its mitigation potential. Journal of Cleaner Production157: 118–124.
31.
MaJLiXLXuHet al. (2007) Effects of nitrogen fertiliser and wheat straw application on CH4 and N2O emissions from a paddy rice field. Australian Journal of Soil Research45: 359–367.
32.
MaanojaSTRintalaJA (2015) Methane oxidation potential of boreal landfill cover materials: The governing factors and enhancement by nutrient manipulation. Waste Management46: 399–407.
33.
MochizukiYKobaKYohM (2012) Strong inhibitory effect of nitrate on atmospheric methane oxidation in forest soils. Soil Biology and Biochemistry50: 164–166.
34.
MurrellJCDaltonH (1983) Ammonia assimilation in Methylococcus capsulatus (Bath) and other obligate methanotrophs. Microbiology129: 1197–1206.
35.
NemanjaSDejanUBojanBet al. (2012) Methane emissions from landfills in Serbia and potential mitigation strategies: a case study. Waste Management & Research30: 1095–1103.
36.
NovikovVVStepanovAL (2002) Coupling of microbial processes of methane and ammonium oxidation in soils. Microbiology71: 234–237.
37.
PengYZhangWFZhuLet al. (2014) Landfill CH4 co-oxidation by ammonia-oxidizing bacteria and the inhibition effect by ammonium. Research of Environmental Sciences27: 172–177.
38.
ReinhartDR (1996) Full-scale experiences with leachate recirculating landfills: case studies. Waste Management & Research14: 347–365.
39.
SadasivamBYReddyKR (2013) Landfill methane oxidation in soil and bio-based cover systems: a review. Reviews in Environmental Science and Bio/Technology13: 79–107.
40.
ScheutzCKjeldsenPBognerJEet al. (2009) Microbial methane oxidation processes and technologies for mitigation of landfill gas emissions. Waste Management & Research27: 409–455.
41.
SchimelJ (2000) Rice, microbes and methane. Nature403: 375, 377.
42.
SteinLYKlotzMG (2011) Nitrifying and denitrifying pathways of methanotrophic bacteria. Biochemical Society Transactions39: 1826–1831.
43.
TanthachoonNChiemchaisriCChiemchaisriWet al. (2008) Methane oxidation in compost-based landfill cover with vegetation during wet and dry conditions in the tropics. Journal of the Air & Waste Management Association58: 603–612.
44.
WangJXiaFFBaiYet al. (2011) Methane oxidation in landfill waste biocover soil: kinetics and sensitivity to ambient conditions. Waste Management31: 864–870.
45.
WatzingerAReichenauerTBlumWet al. (2005) The effect of landfill leachate irrigation on soil gas composition: methane oxidation and nitrous oxide formation. Water, Air, & Soil Pollution164: 295–313.
46.
YangTSunWYueD (2017) Characterizing the effects of biologically active covers on landfill methane emission flux and bio-oxidation. Journal of Environmental Engineering143: 04017059.
47.
YangfeiYBoYYuYet al.(2012) Influence of semi-aerobic and anaerobic landfill operation with leachate recirculation on stabilization processes. Waste Management & Research30: 255.
48.
ZhangDQTanSKGersbergRM (2010) Municipal solid waste management in China: status, problems and challenges. Journal of Environmental Management91: 1623–1633.
49.
ZhangHHePShaoL (2008) Methane emissions from MSW landfill with sandy soil covers under leachate recirculation and subsurface irrigation. Atmospheric Environment42: 5579–5588.
50.
ZhangHYanXCaiBet al. (2015) The effects of aged refuse and sewage sludge on landfill CH4 oxidation and N2O emissions: Roles of moisture content and temperature. Ecological Engineering74: 345–350.
51.
ZhangHZhaoKYanXet al. (2013) Effects of nitrogen conversion and environmental factors on landfill CH4 oxidation and N2O emissions in aged refuse. Journal of Environmental Management126: 174–181.
52.
ZhangXKongJYXiaFFet al. (2014) Effects of ammonium on the activity and community of methanotrophs in landfill biocover soils. Systematic and Applied Microbiology37: 296–304.
53.
ZhangYZhangHJiaBet al. (2012) Landfill CH4 oxidation by mineralized refuse: effects of NH4(+)-N incubation, water content and temperature. Science of the Total Environment426: 406–413.
54.
ZhengXZhouZWangYet al. (2010) Nitrogen-regulated effects of free-air CO2 enrichment on methane emissions from paddy rice fields. Global Change Biology12: 1717–1732.
