Chemical and Physical Processes Associated With Mass Transfer in Odor Control Scrubbers

Hentz, Lawrence H.; Balchunas, Brian M.

doi:10.2175/193864700785303187

Cited by 5 publications

(6 citation statements)

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“…These results can explain the difficulty for CH 3 SH to be removed at high gas velocities. As stated by (Hentz and Balchunas, 2000), the pH is not basic enough to dissociate CH 3 SH to ionised species. As a consequence, in this specific case, mass transfer, is not accelerated, and CH 3 SH absorption is a plain physical operation.…”

Section: H 2 S and Ch 3 Sh Removalmentioning

confidence: 99%

“…This process is performed in a two or three stage scrubber in order to remove successively nitrogenous (with an acid solution) and sulphur compounds (with alkaline hypochlorite sodium solutions). This approach has been showing good results for many years (Bonnin, 1991;Basu et al, 1998;Hentz and Balchunas, 2000;Chen et al, 2001), but has also revealed high investment and working costs. Indeed, the long residence time necessary for a good functioning of the process and the hydrodynamic behaviour inside a packed column imply the construction of high and wide towers.…”

Section: Introductionmentioning

confidence: 99%

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New compact scrubber for odour removal in wastewater treatment plants

Sánchez

Couvert

Laplanche

et al. 2006

Water Science and Technology

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This work presents the performances of a new odour scrubber. The reactor is packed with a new structure which enables co-current operations at high gas velocities. Energy consumption and removal efficiency of sulphur compounds by oxidative alkaline scrubbing were studied. The influence of both superficial gas (U(SG)) and liquid (U(SL)) velocities, ranging from 5.6 to 28 m.s(-1) and 0.016 to 0.055 m.s(-1) respectively, were quantified. Thus, the range of 0.5 to 5 liquid-to-gas mass ratio (L/G) was studied. A comparison has been made with a previous study on static mixers (SM) and with classical random packed towers (PT). It has been shown that superficial liquid and gas velocities have a significant influence on these parameters. Hydrogen sulphide (H2S) abatement reached values up to 99%. As concerns methylmercaptan (CH3SH), the maximal removal efficiency was 87%. As a result, if well scaled-up, our reactor can be a small single stage efficient apparatus for the elimination of low concentrations of sulphur compounds as H2S and CH3SH in high flow rates of polluted gas effluents.

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Section: H 2 S and Ch 3 Sh Removalmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

New compact scrubber for odour removal in wastewater treatment plants

Sánchez

Couvert

Laplanche

et al. 2006

Water Science and Technology

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“…The pKa of CH 3 SH is equal to 9.7. The crucial step is that the pH of the scrubbing solution is not basic enough to dissociate CH 3 SH to ionized species and then enhance its mass transfer rate from gas phase to liquid phase (by moving the gas–liquid equilibrium) . To enhance gas–liquid mass transfer, three improvements can be achieved: solution with higher pH, longer contact time and higher oxidation potential of chemical.…”

Section: Introductionmentioning

confidence: 99%

“…The crucial step is that the pH of the scrubbing solution 456 www.soci.org L Ding, T-X Liu, X-Z Li is not basic enough to dissociate CH 3 SH to ionized species and then enhance its mass transfer rate from gas phase to liquid phase (by moving the gas-liquid equilibrium). 29 To enhance gas-liquid mass transfer, three improvements can be achieved: solution with higher pH, longer contact time and higher oxidation potential of chemical. Indeed, conventional scrubbing processes require high investment and capital costs for the construction of high and wide towers for sufficient gas-liquid contact and distribution.…”

Section: Introductionmentioning

confidence: 99%

Removal of CH₃SH with in‐situ generated ferrate(VI) in a wet‐scrubbing reactor

Ding

Liu

2013

J of Chemical Tech & Biotech

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BACKGROUND A wet scrubbing process with in‐situ electro‐generation of ferrate(VI) has been developed for removing odour from foul gas in wastewater treatment plants. In this process, methyl mercaptan (CH3SH) in synthetic gas is removed through absorption and oxidation by contacting the gaseous stream with aqueous NaOH electrolyte that offers in‐situ generation of ferrate(VI). RESULTS The process parameters including electrolyte concentration, applied current density, initial CH3SH concentration, gas flow rate and gaseous CH3SH compositions were investigated to determine the best operating conditions and design parameters for a scale‐up design. Under all the experimental conditions, gaseous CH3SH was completely removed by the wet scrubbing process at room temperature and atmospheric pressure. The process proved to be quite effective for dissolved CH3S‐ degradation under the optimum experimental condition at the NaOH concentration of 6 mol L–1, current density of 2.22 mA cm‐2 and CH3SH loading below 30 g m‐3 h‐1. A very short contact time of 0.06 s between the gas and the liquid phases was achieved in this in‐situ ferrate(VI) generation reactor. CONCLUSIONS This process is effective for CH3SH control, and holds great promise for industrial applications due to its high efficiency, simplicity and stability. © 2013 Society of Chemical Industry

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“…The most common process for the removal of reactive odorous compounds is chemical scrubbing 5, 6. This approach gave good results for many years,7, 8 but involved high investment and working costs, owing to the high consumption of reactive solution 2. Biological processes such as biofilters, biotrickling filters or bioscrubbers efficiently remove low concentrations of water‐soluble VOCs contained in high gas flow rates 9.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of toluene and sulfur compounds removal by means of an integrated process involving the coupling of absorption and biodegradation

Darracq

Couvert

Couriol

et al. 2010

J of Chemical Tech & Biotech

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International audienceBACKGROUND: Scrubbing using an organic solution instead of an aqueous solution could be a useful way to improve the removal of hydrophobic compounds. Absorption of toluene, dimethyldisulfide (DMDS) and dimethylsulfide (DMS) in an organic solution (di-2-ethylhexyladipate--DEHA), followed by biodegradation by activated sludge was considered, with particular attention to kinetic aspects. DEHA was selected for its relevance in terms of absorption capacity and absorption velocity of the selected volatile organic compounds (VOCs). After the biodegradation step and owing to its cost, recycling of the VOC-free solvent should be considered. RESULTS: Enhancement of VOC mass transfer from the organic to the aqueous phase due to bacterial activity was highlighted and the main driving force was found to be biosurfactant production rather than biodegradation reaction. However, the mass transfer rate between the two phases was shown to be lower than VOC biodegradation rate; hence, significant biodegradation of DMDS and toluene was recorded in a few days during batch experiments, 0.10 and 0.09 mmol respectively. Toluene showed higher biodegradation rates (about 0.05 and 0.10 mg h−1 for DMDS and toluene), leading to higher growth rates. Contrarily, owing to its high volatility, important DMS losses were observed. CONCLUSION: The relevance of the proposed integrated process was shown for hydrophobic VOC removal, at least for toluene and DMDS. Unfortunately, the absorbent phase was also degraded, proved by detection of by-products during analyses of the aqueous phase headspace. The comparison of DEHA with other solvents or solid polymers available for multiphase bioreactor applications may be a reliable option to continue this work

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Chemical and Physical Processes Associated With Mass Transfer in Odor Control Scrubbers

Cited by 5 publications

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New compact scrubber for odour removal in wastewater treatment plants

New compact scrubber for odour removal in wastewater treatment plants

Removal of CH₃SH with in‐situ generated ferrate(VI) in a wet‐scrubbing reactor

Kinetics of toluene and sulfur compounds removal by means of an integrated process involving the coupling of absorption and biodegradation

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Chemical and Physical Processes Associated With Mass Transfer in Odor Control Scrubbers

Cited by 5 publications

References 0 publications

New compact scrubber for odour removal in wastewater treatment plants

New compact scrubber for odour removal in wastewater treatment plants

Removal of CH3SH with in‐situ generated ferrate(VI) in a wet‐scrubbing reactor

Kinetics of toluene and sulfur compounds removal by means of an integrated process involving the coupling of absorption and biodegradation

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Removal of CH₃SH with in‐situ generated ferrate(VI) in a wet‐scrubbing reactor