【摘要】 在重力流管道条件下,通过短期降解实验分析了水力剪切力、温度、外源SO₄^2-及COD浓度对重力排水管道产排CH₄和CO₂的影响,探讨了溶解性有机物（DOM）的变化规律。结果表明,CH₄和CO₂的产排能力随着水力剪切力的增大而增强,但剪应力大于0.0748 N/m后CH₄产排无明显提高;37℃为CH₄和CO₂产排的最适温度,低于37℃的情况下降低温度则会明显抑制CH₄的产生;外源SO42-浓度增大显著抑制CH₄产排,但其与CO₂产排无明显相关性;外源COD浓度增大会同时增强CH₄和CO₂产排。更多还原

【Abstract】 Short-term degradation experiments were carried out under gravity flowed pipe condition to simulate and analyze the effects of hydraulicshear force, temperature, exogenous sulfate and COD on CH₄ and CO₂ emissions in gravity sewers. The change rules of dissolved organic matter（DOM） were analyzed. The data showed that the production and emission capacity of CH₄ and CO₂ increased with the increase of hydraulic shear force, but the CH₄ production and emission capacity did not increase significantly when the shear stress was greater than 0.0748 N/m2. 37 ℃ was the optimum temperature for the production and emission of CH₄ and CO₂. The generation of CH₄ would be inhibited by decreasing temperature when the temperature was below 37 ℃. The increase of exogenous SO₄^2- concentration significantly inhibited CH₄ production and emission, but it had no significant correlation with CO₂ production and emission. The increase of exogenous COD concentration would enhance the production and emission capacity of CH₄ and CO₂ simultaneously.更多还原