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Biotrickling filtration of isopropanol under intermittent loading conditions

机译：间歇加载条件下异丙醇的生物滴滤

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This paper investigates the removal of isopropanol by gas-phase biotrickling filtration. Two plastic packing materials, one structured and one random, have been evaluated in terms of oxygen mass transfer and isopropanol removal efficiency. Oxygen mass transfer experiments were performed at gas velocities of 104 and312 m h~(-1) and liquid velocities between 3 and 33 m h~(-1). Both materials showed similar mass transfer coefficients up to liquid velocities of 15 m h~(-1). At greater liquid velocities, the structured packing exhibited greater oxygen mass transfer coefficients. Biotrickling filtration experiments were carried out at inlet loads (IL) from 20 to 65 g C m~(-3) h~(-1) and empty bed residence times (EBRT) from 14 to 160 s. To simulate typical industrial emissions, intermittent isopropanol loading (16 h/day, 5 day/week) and intermittent spraying frequency (15 min/1.5 h) were applied. Maximum elimination capacity of 51 g C m~(-3) h~(-1) has been obtained for the random packing (IL of 65 g C m~(-3) h~(-1), EBRT of 50 s). The decrease in irrigation frequency to 15 min every 3 h caused a decrease in the outlet emissions from 86 to 59 mg C Nm~(-3) (inlet of 500 mg C Nm~(-3)). The expansion of spraying to night and weekend periods promoted the degradation of the isopropanol accumulated in the water tank during the day, reaching effluent concentrations as low as 44 mg C Nm~(-3). After a 7-week starvation period, the performance was recovered in less than 10 days, proving the robustness of the process.
机译：本文研究了气相生物滴滤法去除异丙醇的方法。在氧气传质和异丙醇去除效率方面评估了两种塑料包装材料，一种是结构化的，另一种是无规的。氧气传质实验是在104和312 m h〜（-1）的气体速度和3和33 m h〜（-1）的液体速度之间进行的。两种材料在液体速度高达15 m h〜（-1）时都显示出相似的传质系数。在较高的液体速度下，规整填料表现出较大的氧气传质系数。生物滴滤实验是在入口负荷（IL）为20至65 g C m〜（-3）h〜（-1）和空床停留时间（EBRT）为14至160 s的条件下进行的。为了模拟典型的工业排放，应用了间歇性异丙醇负载量（16小时/天，5天/周）和间歇喷涂频率（15分钟/1.5小时）。随机包装的最大消除能力为51 g C m〜（-3）h〜（-1）（IL为65 g C m〜（-3）h〜（-1），EBRT为50 s） 。灌溉频率每3小时减少15分钟，导致出口排放量从86 mg C Nm〜（-3）（入口500 mg C Nm〜（-3））减少。到夜间和周末，喷水的扩大促进了白天水箱中积聚的异丙醇的降解，出水浓度低至44 mg C Nm〜（-3）。经过7周的饥饿期后，在不到10天的时间内恢复了性能，证明了该过程的可靠性。

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