准好氧填埋工艺氧气浓度对甲烷与二氧化碳浓度的影响研究

构建了准好氧填埋模拟装置,在其产气相对稳定期间,测定填埋装置内不同点位的ψ(O₂),ψ(CH₄)和ψ(CO₂),并用数学模型对ψ(O₂)与ψ(CH₄)和ψ(CO₂)之间的关系进行拟合.结果表明:随着ψ(O₂)的增加,上层ψ(CH₄)呈对数规律下降,而ψ(CO₂)呈线性规律下降;中层ψ(CH₄)和ψ(CO₂)均呈指数规律下降;下层ψ(CH₄)呈指数规律下降,而ψ(CO₂)先保持在34%左右波动,当ψ(O₂)大于1.8%后呈指数规律下降.上层主要为好氧带,ψ(CH₄)低于ψ(CO₂);中层主要为兼氧带,当ψ(O₂)小于5.8%时ψ(CH₄)高于ψ(CO₂),而当ψ(O₂)大于5.8%时ψ(CH₄)低于ψ(CO₂);下层主要为厌氧带,当ψ(O₂)小于2.8%时ψ(CH₄)高于ψ(CO₂),而当ψ(O₂)大于2.8%时ψ(CH₄)低于ψ(CO₂). 

Research on the Influence of Oxygen Concentration on Methane and Carbon Dioxide Concentrations in Semi-Aerobic Landfill

Semi-aerobic landfill was set up.During the steady stage of landfill gas production,the concentrations of CH_4,CO_2 and O_2 in different points were detected,and the correlativity between O_2 concentration and CH_4,CO_2 concentrations were simulated with mathematical model.The results showed that: with O_2 concentration increasing,the CH_4 concentration declined linearly and the CO_2 concentration declined exponentially in upper layer;the concentrations of CH_4 and CO_2 both declined exponentially in middle layer;in bottom layer the CH_4 concentration was declined exponentially,but that of CO_2 kept fluctuated around 34% initially,and then declined exponentially.The CH_4 concentration was lower than that of CO_2 in upper layer;in middle layer the CH_4 concentration was higher than that of CO_2 when O_2 concentration was less than 5.8%,the CH_4 concentration was lower than that of CO_2 when O_2 concentration was more than 5.8%;In bottom layer the CH_4 concentration was higher than that of CO_2 when O_2 concentration was less than 2.8%,the CH_4 concentration was lower than that of CO_2 when O_2 concentration was more than 2.8%.