The objective of this study was to investigate the removal of mercury chloride in flue gas emitted from municipal waste incinerator (MWI) by the adsorption of powdered activated carbon derived from the pyrolysis of waste tires (PAC-T). This study focused on the removal efficiency of mercury chloride and the adsorption capacity of PAC-T. The operation parameters investigated included temperature (30¢J and 150¢J) and powdered activated carbon injection rate (0.1, 0.2 and 0.3 g/hr). Experimental tests were conducted by the following three steps¡G the adsorption column test, the adsorption isotherm simulation, and the removal efficiency test in a pilot plant.
The adsorption capacity of PAC-T for various inlet mercury chloride concentrations (55~215£gg/m3) at room temperature (30¢J) were 811~2,188£gg-HgCl2/g-PAC, while the absorption capacity of PAC-T at 150¢J were 214~700£gg-HgCl2/g-PAC which were lower than those at room temperature. It suggested that the adsorption capacity of PAC-T decreased as adsorption temperature increased. Furthermore, the adsorption of mercury chloride by PAC-T was an unfavorable adsorption isotherm.
The adsorption column tests were performed to assess the rate of mercury chloride uptake by PAC-T at 30 and 150¢J. Results from the adsorption isotherm simulation indicated that mercury chloride at room temperature (30¢J) can be simulated by the Redlich and Peterson isotherm. However, the adsorption of mercury chloride at 150¢J can be simulated by the Langmuir isotherm.
Experimental results from the pilot tests indicated that the removal efficiency of mercury chloride increased gradually with retention time and then leveled off as retention time was higher than thirty minutes. Moreover, the removal efficiency of mercury chloride increased dramatically as PAC-T injection rate increased from 0.1 to 0.3 g/hr. The highest removal efficiency of mercury chloride which can be achieved by waste-tire derived powdered activated carbon (PAC-T) and commercial powdered activated carbon (PAC-C) were 86.5% and 98.9%, respectively.
In general, PAC-T was comparative to PAC-C for the removal of mercury chloride from flue gas on the basis of both physical and chemical properties and removal efficiency of mercury chloride.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0914101-035810 |
| Date | 14 September 2001 |
| Creators | Liu, Ming-Han |
| Contributors | Chung-Shin Yuan, Chung-Hseun Hung, Tsair-Fuh Lin, Ming-Shean Chou |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | Cholon |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0914101-035810 |
| Rights | off_campus_withheld, Copyright information available at source archive |
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