Abstract
The odor released from environmental facilities is recognized as a major problem in environmental industries. In this study, reactive absorption, using an electrolyzed water solution (electrolyzed water scrubber, EWS), was developed to treat the odorous gases H2S and NH3, which are representative odorous substances. In addition, a numerical model composed of mass transfer coefficients and zero-order kinetic constants was established to predict the performance of EWS. The model was verified through experiments and data fittings. In the experiments, the concentration of H2S varied from 500 to 2000 ppm, while NH3 was fixed at 500 ppm. The results revealed that the H2S removal rate varied depending on the inlet H2S concentration, but no changes were observed for NH3. The numerical model appropriately described the experimental results to further predict the performance of EWS. The model prediction results for the shock loading of H2S indicated that a 100% removal rate can be achieved by increasing the current density to 70 mA cm−2 or higher. Finally, the EWS can be used to reduce the odor, owing to its flexible operation that responds to fluctuating loading rates.
Highlights
Odors emitted from environmental facilities, such as livestock farms, sewage treatment plants, and food waste treatment facilities, are unpleasant and prompt complaints from the adjacent residents [1,2,3]
Odor gases emitted from such facilities include various substances, such as sulfur and nitrogen compounds, acetaldehyde, and organic acids [4]
The aim of this study was to develop a model for predicting EWS performance, using simple ordinary differential equations (ODE) consisting of mass transfer coefficients and kinetic constants
Summary
Odors emitted from environmental facilities, such as livestock farms, sewage treatment plants, and food waste treatment facilities, are unpleasant and prompt complaints from the adjacent residents [1,2,3]. Odor gases emitted from such facilities include various substances, such as sulfur and nitrogen compounds, acetaldehyde, and organic acids [4]. Conventional technologies, such as adsorption and absorption, cannot suppress the problems generated due to mixed odor gases [5]. To overcome this setback, multistage chemical scrubbing technology is widely used [6]. The use of chemicals, such as HCl, H2 SO4 , and NaOH, for wet scrubbing can incur significant costs due to waste treatment solutions
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