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首页> 外文期刊>Journal of Polymers and the Environment >Poly(vinyl alcohol)/Compost Composites for Biofiltration of Swine Waste Volatiles
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Poly(vinyl alcohol)/Compost Composites for Biofiltration of Swine Waste Volatiles

机译：用于猪粪挥发物生物过滤的聚乙烯醇/堆肥复合材料

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摘要

In this study, a Poly(vinyl alcohol)(PVA)/compost composite bead is prepared and is indicated suitable as a filter material for biofiltration. The optimal preparation process is with the compost size of 16-35 mesh, the ratio of water to compost of 40 g/15 g compost, and the immersion time in the phosphate solution of 60 min. The composite bead prepared by this process is a porous spherical particle with a diameter between 2.4 and 6.0 mm and a density of 0.96 g/cm~3. It contains 9.43 mg P/g dry solid and 12.1 mg N/g dry solid. The equilibrium moisture content of the composite bead bed from adsorption and holding experiments is 50.5 and 54.6% on a wet basis respectively, which is about 1.74 times higher than that of swine manure compost bed. It corresponds to the optimal filter material required and is sufficient to sustain biological activity as the composite bead adsorbs equilibrium moisture. The bulk compressive strength of the composite bead bed is about 1.15 times larger than that of swine manure compost bed to ensure even distribution of air flow and reduce the head loss as the air flow stream passed through. The pH value of the filter bed could maintain in the 6.9-7.2 range during the operation period due to the composite bead has the phosphate buffer capacity. The percentage of ethyl acetate removal could remain at over 99% for 40 days operation while the composite beads adsorbed inorganic nitrate nutrients. The pressure drop of two kind composite beads and pig manure compost filter beds are 0 and 2 mm H_2O, respectively, after operating for 40 days.
机译：在这项研究中，制备了聚乙烯醇（PVA）/堆肥复合珠，并被指出适合用作生物过滤的过滤材料。最佳的制备过程是堆肥大小为16-35目，水与堆肥的比例为40 g / 15 g堆肥，在磷酸盐溶液中的浸入时间为60分钟。通过该方法制备的复合珠是直径为2.4至6.0mm且密度为0.96g / cm〜3的多孔球形颗粒。它包含9.43 mg P / g干燥固体和12.1 mg N / g干燥固体。湿法吸附和保持实验得出的复合珠床的平衡水分含量分别为50.5和54.6％，比猪粪堆肥床高约1.74倍。它对应于所需的最佳过滤材料，并且由于复合珠粒吸收了平衡水分，因此足以维持生物活性。复合珠粒床的整体抗压强度比猪粪堆肥床的抗压强度大约1.15倍，以确保气流均匀分布并减少气流通过时的水头损失。由于复合珠具有磷酸盐缓冲能力，因此在操作期间滤床的pH值可以保持在6.9-7.2范围内。在40天的操作中，乙酸乙酯的去除率可以保持在99％以上，而复合珠粒则吸收了无机硝酸盐养分。两种复合珠和猪粪堆肥滤床运行40天后的压降分别为0和2 mm H_2O。

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