嘉義番茄園
鮮採好滋味

Microbial Populations Analysis and Field Application of Biofilter for the Removal of Volatile-sulfur Compounds from Swine Wastewater Treatment System

Kuo-Ling Ho, Ying-Chien Chung, Yueh-Hsien Lin, Ching-Ping Tseng , Journal of Hazardous Materials 152 (2008)

　　A biofilter packed with granular activated carbon (GAC) was applied to eliminate volatile-sulfur compounds (VSC) emitted from solid–liquid separation tank in swine wastewater treatment system. Hydrogen sulfide, methanethiol, dimethyl disulfide, and dimethyl sulfide were effectively reduced to 96–100% at gas residence times of 13–30 s. Elemental sulfur and sulfate are their primary oxidation metabolites. Regarding odor, an average of 86% reduction was achieved at short residence time (13 s). In addition, bioaerosol emissions could also be effectively reduced by 90% with the biofilter. Advantages of the system include low moisture demand, low pressure drop, and high biofilm stability. Further characterization of bacterial populations of the activated carbon samples using the fluorescent in situ hybridization (FISH) technique revealed that Pseudomonas sp. remained the predominant community (56–70%) after long-term evaluation of 415 days.

　　In this study, GAC has been successfully applied to reduce VSC emission from solid–liquid separation tank in swine wastewater treatment system. The biofilter inoculated with Pseudomonas sp. is confirmed to effectively reduce most mixed sulfur compounds (100%) and odor (86%) at short residence time (13 s). Among the emission of these VSC at an EBRT of 30 s, DMS was more difficult to degrade (99%). No acidification occurred in this system since a stable buffer capacity was maintained, and the primary oxidation metabolite was elemental sulfur. Although other bacteria containing non-inoculated Pseudomonas sp. were found in the biofilter, and their ratios increased with increasing time, high immobilization efficiency can lead to predominant population of inoculated Pseudomonas sp. after 415 days operation and result in the stable long-term high removal efficiencies.