Biological oxidation of hydrogen sulfide in mineral media using a biofilm airlift suspension reactor

Moghanloo, Gol Mohammad Mojarrad; Fatehifar, Esmaeil; Saedy, Saeed; Aghaeifar, Zahra; Abbasnezhad, Hassan

doi:10.1016/j.biortech.2010.05.093

Cited by 36 publications

(14 citation statements)

References 30 publications

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“…From the above information, it can be found that much higher abatement activity could be maintained with the temperatures ranging from 25 to 35°C, and optimum temperature was 30°C under the reaction conditions of pH 7.0, 200 rpm and 10 mg L À1 DMDS. This result was in good agreement with other previous work that the unsatisfied removal capacity was attained at lower and higher temperature because of the temperature sensitivity to microorganism (Moghanloo et al, 2010). In addition, the effect of pH value on the biodegradation ability of the strain was also conducted.…”

Section: Biodegradation Kinetics Of Dmdssupporting

confidence: 91%

Aerobic biodegradation of odorous dimethyl disulfide in aqueous medium by isolated Bacillus cereus GIGAN2 and identification of transformation intermediates

Liang

et al. 2015

Bioresource Technology

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Section: Biodegradation Kinetics Of Dmdssupporting

confidence: 91%

Aerobic biodegradation of odorous dimethyl disulfide in aqueous medium by isolated Bacillus cereus GIGAN2 and identification of transformation intermediates

Liang

et al. 2015

Bioresource Technology

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“…However, it was lower than other airlift bioreactors where sulfide solution rather than H 2 S gas was used as a feed [29, 35]. One reason for that may be the absence of mass-transfer problems in the liquid sulfide-fed airlift reactors compared to the gas-fed ones.…”

Section: Resultsmentioning

confidence: 96%

Bioconversion of High Concentrations of Hydrogen Sulfide to Elemental Sulfur in Airlift Bioreactor

Zytoon

Al-Zahrani

Noweir

et al. 2014

The Scientific World Journal

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Several bioreactor systems are used for biological treatment of hydrogen sulfide. Among these, airlift bioreactors are promising for the bioconversion of hydrogen sulfide into elemental sulfur. The performance of airlift bioreactors is not adequately understood, particularly when directly fed with hydrogen sulfide gas. The objective of this paper is to investigate the performance of an airlift bioreactor fed with high concentrations of H2S with special emphasis on the effect of pH in combination with other factors such as H2S loading rate, oxygen availability, and sulfide accumulation. H2S inlet concentrations between 1,008 ppm and 31,215 ppm were applied and elimination capacities up to 113 g H2S m−3 h−1 were achieved in the airlift bioreactor under investigation at a pH range 6.5–8.5. Acidic pH values reduced the elimination capacity. Elemental sulfur recovery up to 95% was achieved under oxygen limited conditions (DO < 0.2 mg/L) and at higher pH values. The sulfur oxidizing bacteria in the bioreactor tolerated accumulated dissolved sulfide concentrations >500 mg/L at pH values 8.0–8.5, and near 100% removal efficiency was achieved. Overall, the resident microorganisms in the studied airlift bioreactor favored pH values in the alkaline range. The bioreactor performance in terms of elimination capacity and sulfur recovery was better at pH range 8–8.5.

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“…In this biofilter, the sulphur from the sulphate in the leachate accounted for more than 90 % of the mass of sulphur in the system after the initial acclimation period showing that almost all the sulphuric acid produced in the biofilter had been collected in the leachate as sulphate. Previous researchers have shown that almost all the H2S removed by an aerobic biofilter is converted to sulphuric acid (Chaiprapat et al 2011;Moghanloo et al 2010).…”

Section: Sulphur Balancementioning

confidence: 99%

Biofilter for generation of concentrated sulphuric acid from H2S

Rabbani

Charles

Kayaalp

et al. 2016

Environ Sci Pollut Res

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Biofilters are used for the conversion of odorous hydrogen sulphide to odourless sulphate in wastewater treatment plants under the right conditions of moisture and pH. One of the consequences of maintaining the suitable pH and moisture content is the production of large volumes of weakly acidic leachate. This paper presents a biofilter with a maximum H2S elimination capacity of 16.3 g m −3 h −1 and removal efficiency greater than 95 % which produces small volumes (1 mL of solution L −1 of reactor day −1 ) of sulphuric acid with a concentration greater than 5.5 M after 150 days of continuous operation. The concentrated sulphuric acid was produced by intermittently trickling a minimum amount of nutrient solution down the upflow biofilter which created a moisture and pH gradient within the biofilter resulting in an environment at the top for the bacterial conversion of H2S, while sulphuric acid was accumulated at the base. Genetic diversity profiling of samples taken from different sections of the biofilter confirms that the upper sections of the biofilter had the best environment for the bacteria to convert H2S to sulphate. The formation of concentrated sulphuric acid presents an opportunity for the recovery of sulphur from the waste stream as a usable product.

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Biological oxidation of hydrogen sulfide in mineral media using a biofilm airlift suspension reactor

Cited by 36 publications

References 30 publications

Aerobic biodegradation of odorous dimethyl disulfide in aqueous medium by isolated Bacillus cereus GIGAN2 and identification of transformation intermediates

Aerobic biodegradation of odorous dimethyl disulfide in aqueous medium by isolated Bacillus cereus GIGAN2 and identification of transformation intermediates

Bioconversion of High Concentrations of Hydrogen Sulfide to Elemental Sulfur in Airlift Bioreactor

Biofilter for generation of concentrated sulphuric acid from H2S

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