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Methane oxidation in water-spreading and compost biofilters

机译：撒水和堆肥生物滤池中的甲烷氧化

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This study evaluated two biofilter designs to mitigate methane emissions from landfill vents. Water-spreading biofilters were designed to use the capillarity of coarse sand overlain by a finer sand to increase the active depth for methane oxidation. Compost biofilters consisted of 238-L barrels containing a 1 : 1 mixture (by volume) of compost to expanded polystyrene pellets. Two replicates of each type of biofilter were tested at an outdoor facility. Gas inflow consisted of an approximately 1 : 1 mixture (by volume) of CH_4 and CO_2. Methane output rates (J_(out); g m~(-2) day~(-1)) were measured using the static chamber technique and the Pedersen et al. (2001) diffusion model. Methane oxidation rate (J_(ox); g m~(-2) day~(-1)) and fraction of methane oxidized (f_(ox)) were determined by mass balance. For methane inflow rates (J_(in)) between 250 and 500 g m~(-2) day~(-1), the compost biofilter J_(ox), 242 g m~(-2) day~(-1), was not significantly different (P = 0.0647) than the water-spreading biofilter J_(ox), 203 g m~(-2) day~(-1); and the compost f_(ox), 69 percent, was not significantly different (P = 0.7354) than water-spreading f_(ox), 63 percent. The water-spreading biofilter was shown to generally perform as well as the compost biofilter, and it may be easier to implement at a landfill and require less maintenance.
机译：这项研究评估了两种生物过滤器的设计，以减轻垃圾填埋场通风口的甲烷排放。撒水生物滤池的设计目的是利用被细砂覆盖的粗砂的毛细作用来增加甲烷氧化的活性深度。堆肥生物滤池由238-L桶组成，桶中包含堆肥与膨胀聚苯乙烯颗粒的1：1混合物（按体积计）。每种类型的生物滤池的两次重复试验均在室外设施上进行了测试。气体流入量由CH_4和CO_2的约1：1混合物（按体积计）组成。使用静态室技术和Pedersen等人的方法测量甲烷的产出率（J_（out）; g m〜（-2）天〜（-1））。 （2001年）扩散模型。通过质量平衡确定甲烷的氧化速率（J_（ox）； g m〜（-2）天〜（-1））和甲烷氧化的分数（f_（ox））。对于250至500 gm〜（-2）天〜（-1）之间的甲烷流入速率（J_（in）），堆肥生物滤池J_（ox）为242 gm〜（-2）天〜（-1）。与水生物滤池J_（ox），203 gm〜（-2）天〜（-1）相比无显着差异（P = 0.0647）;堆肥f_（ox）为69％，与水分散f_（ox）63％相比无显着差异（P = 0.7354）。结果表明，撒水生物滤池的性能通常与堆肥生物滤池相同，并且在垃圾填埋场更容易实施，所需维护更少。

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