Abstract

Deodorization of gases emitted from Tanneries using eco-friendly and cost-effective approaches is necessary for the safe disposal of industrial emissions. There is limited research available on the treatment of odorous gases emitted from tanneries using bio-filter. In this endeavor, pilot-scale studies were performed in a 2.7 m³ bio-filter with synthetic gas mixture containing hydrogen sulfide (H₂S) and ammonia (NH₃) as input gas to study the impact of bedding material for the removal of H₂S and NH₃ using bio-filter and identification of various design parameters for scale-up. The pilot-scale studies showed that the removal efficacy of both NH₃ and H₂S was about 90–99% at an empty bed residence time of 55 seconds at an inlet concentration (NH₃ and H₂S) of 200 to 210 ppmV and microbial count enhanced from 3.5 × 10³ to 8.9 × 10⁹ in 210 days. The microbial biodiversity analysis revealed the dominance of proteobacteriaas as well as Firmicutes and Acinetobacter. A full-scale bio-filter (13.75 m³) was designed, installed, and commissioned in a tannery and observed that the removal efficiency of >99% since last three years.

摘要

使用环保且具有成本效益的方法对制革厂排放的气体进行除臭是安全处置工业排放的必要条件。关于使用生物过滤器处理制革厂排放的恶臭气体的研究有限。在这项努力中，在一个 2.7 m ³生物过滤器中进行了中试研究，该过滤器使用含有硫化氢 (H ₂ S) 和氨 (NH ₃ ) 的合成气体混合物作为输入气体，以研究垫层材料对去除污染物的影响使用生物过滤器的H ₂ S 和 NH ₃并确定用于放大的各种设计参数。中试研究表明，NH ₃和 H ₂的去除效果在入口浓度（NH ₃和 H ₂ S）为 200 至 210 ppmV时，空床停留时间为 55 秒时 S 约为 90-99%，微生物数量在 210 天内从 3.5 × 10 ³增加到 8.9 × 10 ⁹ . 微生物生物多样性分析揭示了变形杆菌以及厚壁菌门和不动杆菌属的优势。在制革厂设计、安装和调试了一个全尺寸的生物过滤器 (13.75 m ³ )，并观察到自过去三年以来的去除效率 >99%。