矿物棉填料孔隙率对生物滴滤池水处理效果的影响

针对生物滴滤池因接触时间短而导致出水不达标的问题，采用3种容重(80、100、120 kg·m−3)的矿物棉作为滤池填料，考察了填料孔隙率对保水性的影响，分析了不同容重填料的生物滴滤池去除污染物的效能，探究了填料孔隙率对微生物群落特征的影响。结果表明，矿物棉载体的吸水、保水性能随其孔隙率增加呈现先增加后减小的趋势；孔隙率较小的矿物棉载体在稳定运行后对COD、${rm{NH}}_4^ + $-N有更好的去除效果，平均去除率分别可达99%和72%，且具有一定的抗冲击负荷能力。高通量测序结果显示，随着矿物棉载体孔隙率的减小，微生物群落物种丰富度增加，而其多样性减少。比较而言，当容重为100 kg·m−3时，矿物棉的吸、保水性高，微生物种群结构适宜，出水水质可达一级A标准，且具有一定的抗冲击负荷能力。

Effect of the porosity of mineral wool on the performance of biotrickling filter

In respond to the problem that the biotrickling filter does not meet the standard due to its short contact time, three kinds of mineral wool with volume weights of 80, 100, and 120 kg·m−3 were used as filter packing to study the influence of filler porosity on water holding capacity. The effectiveness of biotrickling filters with different volume weights in removing pollutants and the influence of filler porosity on the characteristics of microbial community were analyzed. The results showed that the water absorption and water retention performance of the mineral wool carrier increased first and then decreased with its volume weight increased; the mineral wool carrier with lower porosity had better removal effects on COD and ${rm{NH}}_4^ + $-N after stable operation, their corresponding average removal rates were 99% and 72%, respectively, and had a certain impact load resistance. According to the high-throughput sequencing results, with the increase of the volume weight of the mineral wool carrier, the species abundance of the microbial community increased while the diversity decreased. Comparatively, when the volume weight of mineral wool was 100 kg·m−3, its water absorption and water retention were high, the microbial community had a suitable structure, and the effluent quality could meet the Class 1A level, and it had a certain impact load resistance.