The objectives of this study were to investigate the desulfurization kinetics of paper sludge and limestone in a fluidized bed reactor according to bed temperature and air velocity. The experimental results were presented as follows ; First, the bed temperature had a great influence on the desulfurization efficiency of limestone and paper sludge. In paper sludge, the optimum condition in desulfurization temperature was at 800℃ and in limestone, that was at 850℃ or 900℃. Second, as air velocity increased, the desulfurization efficiency(or the absorbed amount of sulfur dioxide) by limestone and paper sludge decreased. And the absorbed amount of sulfur dioxide by paper sludge was larger than that of by limestone. Third, as the velocity increased and the optimum desulfurization temperature became, ks and the removal efficiency increased. So, ks, kd highly depended on the air velocity and bed temperature.

This study was conducted to evaluate capability of dyeing wastewater treatment for 3 type reactors. These reactors were Packed Bed Reactor(PBR), Fluidized Bed reactor(FBR) and Moving Media Complete Mixing Activated Sludge reactor(MMCMAS). Experiments of PBR and FBR were performed by various packing ratios and organic loading rates, experiments of MMCMAS were performed by various organic loading rates In order to obtain SBOD_5 removal efficiencies of more than 90%, the F/Mv ratios of PBR, FBR, MMCMAS were 0.11 ㎏BOD/㎏MLVSS·d, 0.12 ㎏BOD/㎏MLVSS·d, and 0.37 ㎏BOD/㎏MLVSS·d, respectively. So MMCMAS system which has more active microorganisms showed better capability of organic removal and also stronger dynamic and shock loadings than those of PBR and FBR. In PBR and FBR, the media packing ratio of 20% showed better performance of organic matters removal effciencies than 10% and 30%, but sludge production rate at media packing ratio of 30% was relatively lower than that of 10% and 20%. When more than 90% organic matters removal efficiency was obtained, the ratios of attached biomass to total biomass at PBR, FBR, MMCMAS were 89∼99%, 87∼98%, and 54∼80%, respectvely. The ratio of attached biomass to total biomass was low in MMCMAS. This was formation of thin biofilm due to shear force between rotating disc and water. The average sludge production rates(㎏VSS/㎏BODrem.) of PBR, FBR and MMCMAS were 0.20, 0.29 and 0.54, respectively.

The objectives of this study were to investigate the characteristics of desulfurization under different experimental conditions and the effects of desulfurization in a fluidized bed combuster installed with the screen. The experimental results were as follows ; First, as the height of fluidized bed combustor becomes higher, the concentrations of SO_2 mainly increased and sulfur retion of paper sludge was higher than that of natural limestone. Second, the desulfurization by natural limestone occurred at in-bed and the desulfurization by paper sludge occurred in the whole of fluidized bed combuster. In additiion, we identified calcium sulfate by the analysis of SEM and XRD. Third, screen at splash region increased sulfur retention 2∼5%, air velocity and anthracite fraction had a little effect on the sulfur retention.

It has been studied that combustion and the production of air pollution of anthracite - bituminous coal blend in a fluidized bed coal combustor. The objects of this study were to investigate mixing characteristics of the particles as well as the combustibility of the low grade domestic anthracite coal and imported high calorific bituminous coal in the fluidized bed coal combustor. They were used as coal samples ; the domestic low grade anthracite coal with heating value of 2,010㎉/㎏ and the imported high grade bituminous coal with heating value of 6,520㎉/㎏. Also, the effects of air flow rate and anthracite fraction on the reaching time of steady state condition have been studied. The experimental results are presented as follows. The time of reaching to steady state was affected by the temperature variation. The steady state time was about 120 minute at 300scfh which was the fastest. It has been found that O_2 and CO_2 concentration were reached steady state at about 100 minute. It has been found that O_2 concentration decreased and CO_2 concentration increased as the height of fluidized bed increased. It was found that splash zone was mainly located from 25㎝ to 35㎝ above distributor. Also, as anthracite fraction increased, the mass of elutriation particles increased, and CO_2 concentration decreased. As air flow rate increased, O_2 concentration decreased and CO_2 concentration increased. Regardless of anthracite fraction and flow rate, the uncombustible weight percentage according to average diameter of elutriation particles were approximately high in the case of fine particles. As anthracite fraction and air flow rate increased, elutriation ratio increased. As anthracite fraction was increased, exit combustible content over feeding combustible content was increased. Regardless of anthracite fraction, size distribution of bed material from discharge was almost constant. Over bed temperature 850℃ and excess air 20%, the difference of combution efficiencies were little. It is estimate that the combustion condition in anthracite-bituminous coal blend combustion is suitable at the velocity 0.3m/s, bed temperature 850℃, the excess air 20%.