Removal of H₂S in down-flow GAC biofiltration using sulfide oxidizing bacteria from concentrated latex wastewater
2009
Rattanapan, Cheerawit | Boonsawang, Piyarat | Kantachote, Duangporn
A biofiltration system with sulfur oxidizing bacteria immobilized on granular activated carbon (GAC) as packing materials had a good potential when used to eliminate H₂S. The sulfur oxidizing bacteria were stimulated from concentrated latex wastewater with sulfur supplement under aerobic condition. Afterward, it was immobilized on GAC to test the performance of cell-immobilized GAC biofilter. In this study, the effect of inlet H₂S concentration, H₂S gas flow rate, air gas flow rate and long-term operation on the H₂S removal efficiency was investigated. In addition, the comparative performance of sulfide oxidizing bacterium immobilized on GAC (biofilter A) and GAC without cell immobilization (biofilter B) systems was studied. It was found that the efficiency of the H₂S removal was more than 98% even at high concentrations (200-4000ppm) and the maximum elimination capacity was about 125gH₂S/m³of GAC/h in the biofilter A. However, the H₂S flow rate of 15-35l/h into both biofilters had little influence on the efficiency of H₂S removal. Moreover, an air flow rate of 5.86l/h gave complete removal of H₂S (100%) in biofilter A. During the long-term operation, the complete H₂S removal was achieved after 3-days operation in biofilter A and remained stable up to 60-days.
Show more [+] Less [-]AGROVOC Keywords
Bibliographic information
This bibliographic record has been provided by National Agricultural Library