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Treatment of exhaust gases from a night soil treatment plant by a combined deodorization system of activated carbon fabric reactor and peat biofilter inoculated with Thiobacillus thioparus DW44

1993; Elsevier BV; Volume: 76; Issue: 5 Linguagem: Inglês

10.1016/0922-338x(93)90039-b

1872-8073

Sang-Jin Park, Mitsuyo Hirai, Makoto Shoda,

Wastewater Treatment and Nitrogen Removal

The exhaust gases from a night soil treatment plant were treated by a pilot-scale two-stage deodorization system consisting first of an activated carbon fabric (ACF) reactor and then a peat biofilter inoculated with Thiobacillus thioparus DW44 for a period of about 2.5 months at space velocities (SV) of 300 and 500 h−1. The stable removal ratios for dimethyl sulfide (DMS) and dimethyl disulfide (DMDS) in this two-stage system continued longer than in a peat biofilter used shown in a previous study (J. Ferment. Bioeng., 76, 55, 1993), mainly because hydrogen sulfide (H2S) and methanethiol (MT) were oxidized first in the ACF filter, thus significantly reducing the decline of the pH in the second peat biofilter. The two-stage system was also found to be more easily operated than the single-stage peat biofilter in terms of the water supply requirements and stabilization of the peat to guarantee microbial activity. As the DMS removal ratio was reduced at an SV of 500 h−1 even when the pH was stably maintained, it was assumed that DW44 was metabolically overloaded with respect to its ability to remove DMS at an SV of 500 or more.