Nicolai R E, Janni K A
Department of Biosystems and Agricultural Engineering, University of Minnesota, St. Paul, MN, USA.
Water Sci Technol. 2001;44(9):261-7.
Biofilter media mixtures were compared in 18 pilot-scale biofilters treating pit gases from a swine facility. The compost and wood chips mixtures ranged from 100% wood chips to a 50-50 blend in 10% increments. The effect of three media moisture contents (low, medium, and high) on biofilter performance was also evaluated. Odor and hydrogen sulfide reduction did not change significantly for mixtures with greater than 20% compost. For efficient odor, hydrogen sulfide, and ammonia reduction media moisture must be greater than 40% wb. Media moisture content influenced odor, hydrogen sulfide, and ammonia reduction more than the ratio of compost and wood chips. The count of heterotrophic or sulfur-oxidizing bacteria did not change in a discernable pattern with respect to media mixture or moisture content. As the amount of compost increased in the media mixtures, the pressure drop also increased. Based on this experiment, the recommended mixing ratio of compost to wood chips for biofilters on swine facilities is minimum 30% compost and 70% wood chips by weight.
在18个中试规模的生物滤池中对生物滤池介质混合物进行了比较，这些生物滤池用于处理来自养猪场的坑气。堆肥和木屑混合物的比例从100%木屑到50-50混合，以10%的增量变化。还评估了三种介质水分含量（低、中、高）对生物滤池性能的影响。对于堆肥含量大于20%的混合物，气味和硫化氢的减少没有显著变化。为了有效减少气味、硫化氢和氨，介质水分必须大于40%（湿基）。介质水分含量对气味、硫化氢和氨减少的影响大于堆肥和木屑的比例。异养或硫氧化细菌的数量在介质混合物或水分含量方面没有明显的变化模式。随着介质混合物中堆肥量的增加，压降也增加。基于该实验，养猪场生物滤池堆肥与木屑的推荐混合比例按重量计至少为30%堆肥和70%木屑。
