Biological Deodorization of Hydrogen Sulfide Using Porous Lava as a Carrier of Thiobacillus thiooxidans

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Biological deodorization of hydrogen sulfide(H_2S) was studied using porous lava as a carrier of Thiobacillus thiooxidans in a laboratory-scale biofilter. Three different samples of porous lava, A, B, and C, which were obtained from Cheju Island in Korea, were used. The water-holding capacities of samples A, B and C were 0.38, 0.25, and 0.47 g-H_2O/g-lava, respectively. The pHs and densities of the lava samples ranged from 8.25-9.24 and 920-1190kg/m^3, respectively. The buffering capacities, expressed as the amount of sulfate added to lower the pH to 4, were 60 g-SO_4^<2->/kg-lava for sample A, 50 g-SO_4^<2->/kg-lava for B, and 90 g-SO_4^<2->/kg-lava for C. To investigate the removal characteristics of H_2S by the lava biofilters, T.thiooxidans was immobilized on the lava samples. Biofilters A and C showed a removal capacity of 428 g-S・m^<-3>・h^<-1> when H_2S was supplied with 428 g-S・m^<-3>・h^<-1> of inlet load at a space velocity(SV) of 300 h^<-1>. At the same inlet load and SV, the removal capacity of biofilter B was 396 g-S・m^<-3>・h^<-1>. The H_2S critical loads of biofilters A, B and C at a SV of 400 h^<-1> were 396, 157 and 342 g-S・m^<-3>・h^<-1> respectively. It is suggested that natural, porous lava is a promising candidate as a carrier of microorganisms in biofiltration.
社団法人日本生物工学会の論文
2000-07-25