Characteristics of Hydrogen Sulfide Removal by Thiobacillus thiooxidans KS1 Isolated from a Carrier-Packed Biological Deodorization System

概要

論文の詳細を見る
Odorant concentrations and the pH distribution in a carrier-packed biological deodorization (CPBD) reactor which is currently being used in a sewage treatment plant were measured. The results showed that more than 99% of the H_2S and 70-80% of the MT were removed from the raw gas in the early section of the packed bed, which comprised one quarter of the total volume of the CPDB reactor. For this reason, this section of the packed bed was considered to be essential in the removal of sulfur odorants. The pH in this section was very low (pH 1-2), and changed little even after water sprinkling. Thiobacillus thiooxidans KS1 was the dominant strain isolated from the early section of the reactor. Kinetic analysis of H_2S removal by KS1 was carried out using a closed stirred-tank reactor and considering the physical absorption rate of H_2S. The effects of pH and temperature on the maximum specific H_2S removal rate (V_m=μmol・min^<-1>・cell^<-1>) were determined. Since strain KS1 is classified as an acidophilic sulfur-oxidizing bacterium, the V_m was measured in the acidic pH range. At 30℃, the V_m at pHs 2.5 and 1.0 was 2.84×10^<-10> and 2.29×10<-10> μmol・min^<-1>・cell^<-1>, respectively. On the other hand, at 10℃, pH 2.5,the V_m was 0.12×10^<-10> μmol・min^<-1>・cell^<-1>, which was only about 1/20 the removal rate at 30℃.
公益社団法人日本生物工学会の論文
1995-12-25