Several methodologies were tested to supply nutrients to a downflow biofilter packed with perlite and used to treat toluene-polluted air. Despite the presence of an inorganic carrier, elimination capacities of up to around 60 g/m3 per hour could be maintained when a basal medium, containing nitrogen, phosphorus and potassium, was supplied once every fortnight or even once a month rather than once a week. Experimental results also indicated that the addition of vitamins or trace minerals to the basal aqueous medium hardly improved biofilter performance. Furthermore, the nutrient supply could be combined with a biomass control strategy, using air sparging, without any adverse effect on biofilter performance compared to supplying nutrients alone, and limiting the accumulation of excess biomass on the packing material. The performance of the biofilter was not significantly affected by temperature fluctuations between 25 and 33 °C.
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机译：测试了几种方法来向装有珍珠岩的下流式生物滤池供应养分，并用于处理甲苯污染的空气。尽管存在无机载体，但如果每两周甚至每月一次而不是每周一次提供含有氮，磷和钾的基础培养基，则每小时可保持高达约60 g / m3的清除能力。 。实验结果还表明，向基础水性介质中添加维生素或微量矿物质几乎无法改善生物滤池的性能。此外，养分的供应可以与生物质控制策略相结合，使用空气喷射，与单独供应养分相比，对生物过滤器的性能没有任何不利影响，并且可以限制包装材料上多余的生物质的积累。 25至33°C之间的温度波动不会明显影响生物过滤器的性能。
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