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Comparison of biological H 2 S removal characteristics between a composite packing material with and without functional microorganisms

View Article: PubMed Central - PubMed

ABSTRACT

The performances of two identical biofilters, filled with a new composite packing material (named CM-5) embedded with functional microorganisms or sterilized CM-5 without microorganisms, were investigated for H2S treatment. Running parameters in terms of microbial counts, pressure drops, and inlet and outlet H2S concentrations were measured. The results show that the microbial count of the CM-5 was approximately ×105 CFU/g before being filled into the biofilter, while that of the sterilized CM-5 was negligible. The functional microorganisms embedded in CM-5 adapted to the environment containing H2S quickly. In most cases, pressure drops of the CM-5 biofilter were slightly higher than those of the sterilized CM-5 biofilter when the gas flow rate was 0.6–2.5 m3/h. The maximum elimination capacity (EC) of the CM-5 biofilter in treating H2S could reach up to 65 g/(m3·h) when the loading rate (LR) was approximately 80 g/(m3·h). If the LR was much higher, the measured EC showed a slight downward trend. The experimental ECs of biofilters were fitted by two typical dynamic models: the Michaelis-Menten model and the Haldane model. Compared with the Michaelis-Menten model, the Haldane model fit the experimental ECs better for the two biofilters because of the presence of the substrate inhibition behaviour.

No MeSH data available.


Average pressure drop values for CM-5 and sterilized CM-5 at the 30th day.
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f2: Average pressure drop values for CM-5 and sterilized CM-5 at the 30th day.

Mentions: The pressure drops are closely related to the operating cost of the biofilter system, which could be impacted by many factors, such as the water content, airflow velocity, packing material size and material shape. In this section, only the superficial gas velocity and microorganisms on the materials were considered. Figure 2 shows the relationship between pressure drop values and superficial gas velocity after the two biofilters were run for 30 days. The results reveal that the term ΔP/(L·V) (ΔP is the pressure drop along the packing material bed length (Pa); L is the height of the packing material layer (m); V is the superficial air velocity (m·s−1)) was proportional to the gas velocity, indicating that pressure drop values fit the Ergun equation very well. The linear correlations were 0.974 and 0.963 for the CM-5 biofilter and sterilized CM-5 biofilter, respectively. Different amounts of increase in pressure drops were observed for the two packing materials. Specially, the β constant values, representing the energy losses, calculated from the fitted equations were 6477.0 and 5146.5 Pa/(s2·m3) for CM-5 and sterilized CM-5, respectively. Clearly, the β constant value (β (Pa·s2/m3) is the regression parameter) of CM-5 was higher than that of sterilized CM-5, which was attributed to the biomass on CM-5 being higher than that on sterilized CM-5, as shown in Fig. 1. More biomass on the material surface might result in the void space among the CM-5 becoming a little smaller, increasing the pressure.


Comparison of biological H 2 S removal characteristics between a composite packing material with and without functional microorganisms
Average pressure drop values for CM-5 and sterilized CM-5 at the 30th day.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5304181&req=5

f2: Average pressure drop values for CM-5 and sterilized CM-5 at the 30th day.
Mentions: The pressure drops are closely related to the operating cost of the biofilter system, which could be impacted by many factors, such as the water content, airflow velocity, packing material size and material shape. In this section, only the superficial gas velocity and microorganisms on the materials were considered. Figure 2 shows the relationship between pressure drop values and superficial gas velocity after the two biofilters were run for 30 days. The results reveal that the term ΔP/(L·V) (ΔP is the pressure drop along the packing material bed length (Pa); L is the height of the packing material layer (m); V is the superficial air velocity (m·s−1)) was proportional to the gas velocity, indicating that pressure drop values fit the Ergun equation very well. The linear correlations were 0.974 and 0.963 for the CM-5 biofilter and sterilized CM-5 biofilter, respectively. Different amounts of increase in pressure drops were observed for the two packing materials. Specially, the β constant values, representing the energy losses, calculated from the fitted equations were 6477.0 and 5146.5 Pa/(s2·m3) for CM-5 and sterilized CM-5, respectively. Clearly, the β constant value (β (Pa·s2/m3) is the regression parameter) of CM-5 was higher than that of sterilized CM-5, which was attributed to the biomass on CM-5 being higher than that on sterilized CM-5, as shown in Fig. 1. More biomass on the material surface might result in the void space among the CM-5 becoming a little smaller, increasing the pressure.

View Article: PubMed Central - PubMed

ABSTRACT

The performances of two identical biofilters, filled with a new composite packing material (named CM-5) embedded with functional microorganisms or sterilized CM-5 without microorganisms, were investigated for H2S treatment. Running parameters in terms of microbial counts, pressure drops, and inlet and outlet H2S concentrations were measured. The results show that the microbial count of the CM-5 was approximately ×105 CFU/g before being filled into the biofilter, while that of the sterilized CM-5 was negligible. The functional microorganisms embedded in CM-5 adapted to the environment containing H2S quickly. In most cases, pressure drops of the CM-5 biofilter were slightly higher than those of the sterilized CM-5 biofilter when the gas flow rate was 0.6–2.5 m3/h. The maximum elimination capacity (EC) of the CM-5 biofilter in treating H2S could reach up to 65 g/(m3·h) when the loading rate (LR) was approximately 80 g/(m3·h). If the LR was much higher, the measured EC showed a slight downward trend. The experimental ECs of biofilters were fitted by two typical dynamic models: the Michaelis-Menten model and the Haldane model. Compared with the Michaelis-Menten model, the Haldane model fit the experimental ECs better for the two biofilters because of the presence of the substrate inhibition behaviour.

No MeSH data available.