According to the quality standards of the BIO-SRF(Bio-Solid Fuel Products) in Act on the Promotion of Saving and Recycling of Resources enforcement regulations, chloride is regulated to less than 0.5wt.%. The reason why chloride was regulated may generate HCl and dioxin when bio-solid fuel was burnt. Chloride and chloride compounds can be presented the characteristic of corrosiveness. These materials is reacted with iron to produce ferric chloride. Ferric chloride is oxidized to ferric oxide and ferric oxide can cause a pipe corrosion to short boiler life in combustion facility. There are several reactions to reduce Cl concentration in organic wastes and some wastes can be used in nucleophile reaction as reductive agents. Nucleophile(Nu) material can be represented by phosphate, nitrate, sulfate etc. Nu materials can substitute them for chlorine-based compounds(X-: Cl-, Br-, I-). Nu materials can reduce the harmfulness and chlorine concentration by substituting them for chlorine-based compounds of the solid fuel product produced by carbonization. In order to produce solid fuel product from organic wastes, carbonization among pyrolysis processes is suitable because nucleophile reaction should be an endothermic reaction, which heat must be entered to solid fuel product from outside. In this study, sewage sludge is used as a reductive agent to evaluate the characteristics of the reduction reaction in carbonization process because a large amount of Nu material is contained in sewage sludge. In order to evaluate the effect of Nu materials to control chloride in the residue of carbonization, waste wood mixed with sewage sludge was used in carbonization process.

Experimental studies were carried out on surface area of char during pyrolysis of sewage sludge. To evaluate surface area of resultant char we use iodine number. Increase of iodine number shows that the surface area of char increases. The process parameters, temperature and holding time have significant effect on surface area of char. Increasing temperature above 400℃ surface area of char decreases while slightly increasing when holding time increases. In this study, the optimum conditions for high surface area of resultant char were found 400℃ and 30minutes, respectively.

Dewatering for reduction of moisture content in sludge cake is one of the main procedure in sludge treatment processing. Through dehydration process, the volume of sludge cake are substantially decreased. It led efficiency improvement of further processing such as transport and disposal of sludge as well as drying cake could be utilized as solid refuse fuel. Microwave dryer is energy efficient process in comparison with thermal types. For these reason, we developed microwave dryer for real field applications. Firstly, with 4kW scale microwave dryer, operation conditions were optimized in terms of generator power, shape of drying champer, and height of microwave generator. Based on the results, 10kW scale microwave dryer was designed and manufactured successfully.

At the time of the end of 2013, public sewage treatment facilities running nationwide facility capacity to over the 500 m³/day is 569 places at 25,085,810 m³/day, less than 500 m³/day facility capacity to 3,205 places is 244,592 m³/day. This is increased by about 2% annually in sewer diffusion rate 78.8% from 2003 to 2013 increased to 92.1%, but due to factors such as an increase in population. Also, every year changes in the inflow rate and the inflow sewage of concentration of sewage treatment facilities, has increased continuously. The concentration of organic matter in the sewage thus generated, which is removed by sewage treatment process, the most important process in the second process is a biological process. Most biological processes, maintaining DO, pH, and the environment of operation by a temperature sensor. But if you have these sensors to the original, there is a disadvantage that it is impossible to monitor the state of the microorganisms directly. And, therefore, in this study, we tried to study the possibility by direct measurement method the state of the microorganisms of activated sludge was used intermittently investigation and deviation capture of NADH of the light source of the biological reaction tank. In this study, measured is installed a detector capable deviation capture detection by a light source is irradiated to the fluorescence due to the reaction of NADH in microorganisms in light source unit and 460 nm which can be intermittently irradiated with UV at 340 nm, and devices, profile is made to be composed of a passage for receiving the fluorescence emitted microorganisms by irradiation with UV light microorganisms size diameter 200 mm, length 740 mm. Biological reactor of interest, and the activated sludge biological reaction tank of Gyeonggi A City sewage treatment plant to the subject, measurement points, was carried out in the total of four locations. The sensor was calibrated in the same conditions as zero state laboratory, this time when the NAD based on the water 0.2 m point current (A) is 50 mA, 100 mA, 200 mA, respectively 26, 48, 84.5 has been measured in the (intensity value). This is according to the increase in current value. Intensity also proportionally increased, is determined as indicating a direct electrical reception may show the ease of measurement. Also, salvaged and re-invasion enemy repeatedly re-dipping after, shows the Intensity value of 84.1 at 200 mA, it was found that the reproducibility is good. The results were tested using an actual immersion light measuring device using the intermittent investigation and variance capture method from bioreactor wastewater treatment plants in operation, changes in the value of the change in star Intensity of current, as the load is high, higher and the current value increases, the proportional is increased it is determined that the reproducibility is good, and those entering least a light source and the detection consumable parts rain due to the previous year and maintain than investigation and detection methods continuous light source.

Carbon dioxide has steadily increased in atmosphere since the industrial revolution, and it is the main cause of the global warming. In this study, carbon dioxide is stored in the form of insoluble calcium carbonate through indirect carbonation using paper sludge ash (PSA) as a raw material and acids (acetic acid and hydrochloric acid) as solvents. Acid is very efficient to extract calcium from PSA, which is as high as 55%. However, since the pH of calcium extractant obtained using acid is as low as 6 and carbon dioxide is not present in the form of CO32- at the low pH, carbonation reaction does not occur to form calcium carbonate. Sodium hydroxide, therefore, is added into the calcium extractant to increase pH up to 13. The amount of sodium hydroxide is calculated based on the equivalent of calcium in the extractant. Then, carbon dioxide is injected into the calcium extractant for 30 minutes at a flow rate of 0.05 L/min. The calcium extractant is prepared in advance using 40 g of PSA and 1L of 0.7 M acid, and 35mL of 50% sodium hydroxide is added into the extractant to adjust pH. During carbonation, liquid samples are taken at designated intervals to measure pH and calcium concentration. After the carbonation is completed, white solids are collected to dry at 105℃ for 12 hours, which weigh 30.0 g and 33.1 g from the extractants using acetic acid and hydrochloric acid, respectively. The white solids are found to be highly pure calcite by XRD analysis. Based on the solid mass, the amounts of carbon dioxide sequestrated in PSA are calculated to be 330.4 kg CO2/ton PSA and 363.7 kg CO2/ton PSA using acetic acid and hydrochloric acid as solvents, respectively.

Three hundred thousand tons per year of water works sludge are produced in Korea. End disposal of the sludge is mainly based on recycle such as supplementary material for cement kiln, raw material for construction materials and fill material. The dry clarifier sludge organic content is about 30% and the major elements determined are aluminum(about 14%), iron(about 4%), potassium(1.8%), and manganese(0.5%). The recovery of coagulant has high economic advantage and recommended as a suitable treatment option for the disposal of water works sludge. Chemically, coagulant(aluminum) recovery from the water works sludge is a simple process. This process is however, somewhat complicated by pH control in the mixture of dewatered clarifier sludge and sulfuric acid solution. Also, the thickened water works sludge(TWS), which is withdrawn from the bottom of the thickener in water works plant, is difficult to dewater. In addition coagulation is used to remove total phosphorus(T-P) from municipal wastewater in oder to strengthening discharge water quality standard for T-P in municipal wastewater treatment plant(MWTP). Nevertheless it has the drawback of producing a large amount of sludge which together with the coagulants such as alum and polyaluminum chloride used to treat T-P in municipal wastewater increases the operating cost. Reject water originates from the dewatering of digested sludge in the MWTP. It contains heavy metals and large amounts of nutrients such as phosphorus and nitrogen. Traditionally, reject water is recycled back to the main flow line on of the MWTP. Although this method seems to be simple, it also has its drawbacks. First of which is the increase in the load of the MWTP as the reject water characteristics is very much different from the normal municipal wastewater. The objective of this study is to investigate the effectiveness of thickened water works sludge as an adsorbent of phosphorus from the reject water. In this study, batches of experiments were conducted to investigate the effect of dosage of TWS for reject water on its phosphorus adsorption properties. Increasing the TWS dosage to 30%(vol/vol), T-P and COD of reject water decreased to 55% and 20% respectively. Experimental results show that the potential of the TWS as coagulant in phosphorus and organic matter immobilization, thus converting they from rejector water to a useful material in pollutant control.

Since water works sludge have a high aluminum content, recycling aluminum has become a significant environmental issue. Generally, the method of recovery of aluminum from water works sludge are acid digestion, alkalization, ion exchange and membrane separation. However aluminum hydroxide may be dissolved in strong acidic and alkaline media due to its amphoteric nature. So, the traditional acidification and alkalization methods still being explored. Chemically, aluminum recovery from the water works sludge is a simple process. The acid digestion is however, somewhat complicated by pH control in the mixture of dewatered water works sludge (DWS) and sulfuric acid solution. Under strong acidic condition, probe of pH meter, which is a key part of a pH meter, can be easily damaged. Also it is not easy to control pH during the process of mixing DWS and acid solution because high concentration of total solid are present in the mixture. Furthermore, the moisture content of DWS is very serious change. Most of the previous studies have mainly focused on the adsorption properties of dewatered alum sludge; little attention has been put on how to improve its phosphorus adsorption capacity. In this study, batches of experiments were conducted using DWS, artificially controlling moisture content (64~78%), to investigate the effect of concentration of sulfuric acid on pH of the sludge for pH control without pH meter in the coagulants recovery process. The water content of DWS was measured in 30 minutes using Infrared Moisture Determination Balance (FD 660, Kett). Experimental results show that the concentration of sulfuric acid for acidification of DWS is higher with higher water content of that.

This study investigated the semi-continuous and continuous cultivation of microalgae-sludge for artificial digested food wastes leachate treatment, and the effect of hydraulic retention times(HRT) on microalgae growth and nutrient removal. In this study, two reactors were examined the HRTs from 4 to 1 day, the Chlorella vulgaris cell density of semi-continuous and continuous cultivation reached a maximum value at HRT 3 day, then decreasing HRT to 2 day and 1 day the Chlorella vulgaris cell density was decreased. The maximum Chlorella vulgaris cell density in semi-continuous cultivation was 1.4 times higher than continuous cultivation. The maximum NH4-N, PO4-P removal efficiency was 100%, 75.7% with HRT of 3 day in semi-continuous cultivation, while 96.5%, 65.7% with HRT of 4 day in continuous cultivation. These results indicate that semi-continuous cultivation is more suitable than continuous cultivation. And the effect of increased light intensity from 100 μmol/m²/s to 400 μmol/m²/s was also evaluated, as the result, increased light intensity improved Chlorella vulgaris cell growth and nutrient removal.

This objectives of research are to figure out combustion characteristics with increasing temperature with petrochemical sludge by adding wasted organic matters which are waste electric wire, anthracite coal and sawdust, and to exam heating value and ignition temperature for using refused derived fuels(RDFs). After analyzing TGA/DTG, petrochemical sludge shows a rapid weight reduction by vaporing of inner moisture after 170℃. Gross weight reduction rate, ignition temperature and combustion rates represent 68.6%, 221.9℃ and 54.1%, respectively. In order to assess the validity of the RDFs, the petrochemical sludge by adding wasted organic matters which are waste electric wire, anthracite coal and waste sawdust. The materials are mixed with 7:3(petrochemical sludge : organic matters)(wt%), and it analyzes after below 10% of moisture content. The ignition temperatures and combustion rates of the waste electric wire, anthracite coal and waste sawdust are 410. 6℃, 596.1℃ and 284.1℃, and 85.6%, 30.7% and 88.8% respectively. In heating values, petrochemical sludge is 3,600 kcal/kg. And the heating values of mixed sludge (adding 30% of the waste electric wire, anthracite coal and waste sawdust) each increase up to 4,600 kcal/kg, 4,100 kcal/kg and 4,300 kcal/kg. It improves the ignition temperatures and combustion rates by mixing petrochemical sludge and organic matters. It is considered that the production of RDFs is sufficiently possible by using of petrochemical sludge by mixing wasted organic matters.

Waste heavy oil sludge is considered oil waste that can be utilized as a renewable energy source. Although it has high calorific values, it should be treated as a designated waste. During the recycling process of construction and demolition wastes or the trimming process of woods, a lot of sawdust is produced. In this study, the feasibility of BOF (biomass and waste heavy oil sludge fuel) as a source of renewable energy was estimated. To investigate its combustion characteristics, a lab scale batch type combustion reactor was used, and temperature fluctuation and the flue gas composition were measured for various experimental conditions. The results could be summarized as follows: The solid fuel pellets manufactured from waste heavy oil sludge and sawdust had C 50.21 ~ 54.77%, H 10.25 ~ 12.66%, O 25.84 ~ 34.83%, N 1.01 ~ 1.04%, S 1.03 ~ 1.07%. Their lower heating values ranged from 4,780 kg/kcal to 5,530 kg/kcal. The density of the solid fuel pellets was increased from 0.63 g/cm3 to 0.85 g/cm3 with increasing the mixing ratio of waste heavy oil sludge. The maximum CO2 concentration in the flue gas was increased with increasing waste heavy oil sludge content in BOF. SO2 concentration in the flue gas was showed a tendency such as the highest CO2 concentration in the flue gas. With increasing waste heavy oil sludge content in BOF, the combustion time became rather shorter although the increase of the CO2 concentration in the flue gas was delayed. Because the carbon conversion rate showed small difference with increasing the mixing ratio of waste heavy oil sludge in BOF, BOF with the mixing ratio of waste heavy oil sludge of 30% was effective for combustion. With increasing the mixing ratio of waste heavy oil sludge in BOF, activation energy and the amount of total CO emissions were increased, while activation energy was decreased with increasing the air/fuel ratio. Therefore, the optimal air/fuel ratio for the combustion of BOF was 1.5.

Waste heavy oil sludge is considered oil waste that can be utilized as a renewable energy source. In this study, an attempt has been made to convert the mixtures of waste heavy oil sludge and sawdust into solid biomass fuels. The solid fuel pellets from waste heavy oil sludge and sawdust could be manufactured only with a press type pelletizer. The mixing ratios of waste heavy oil sludge and sawdust capable of manufacturing a solid fuel pellet were 30 : 70, 40 : 60 and 50 : 50. Ultimate analysis result revealed that these mixtures had C 50.21 ~ 54.77%, H 10.25 ~ 12.66%, O 25.84 ~ 34.83%, N 1.01 ~ 1.04%, S 1.03 ~ 1.07%. With increasing the mixing ratio of waste heavy oil sludge, the carbon and hydrogen content in solid fuel pellets were increased, while the oxygen content was decreased. But the nitrogen and sulfur content in solid fuel pellets did not show much difference. Their lower heating values ranged from 4,780 kg/kcal to 5,530 kg/kcal. The density of the solid fuel pellets was increased from 0.63 g/cm3 to 0.85 g/cm3 with increasing the mixing ratio of waste heavy oil sludge and the collapse of the solid fuel pellets occurred at a moisture content of 21%. As the mixing ratio of waste heavy oil sludge in the solid fuel pellets was increased, the reaction of thermal cracking became faster. It was also observed that the solid fuel pellets were thermally decomposed in two steps and their DTG curves were simpler with increasing the mixing ratio of waste heavy oil sludge. The activation energy and the pre-exponential factor of the solid fuel pellets ranged from 18.90 kcal/mol to 21.36 kcal/mol and from 201 l/sec to 8,793 l/sec, respectively. They were increased with increasing the mixing ratio of waste heavy oil sludge.

Waste oil sludge was generated from waste oil purification process, oil bunker, or the ocean plant. Although it has high calorific values, it should be treated as a designated waste. During the recycling process of construction and demolition wastes or the trimming process of woods, a lot of sawdust is produced. In this study, the feasibility of BOF (biomass and waste oil sludge Fuel) as a source of renewable energy was estimated. To estimate combustion characteristics, a lab scale batch type combustion reactor was used and temperature fluctuation and the flue gas composition were measured for various experimental conditions. The results could be summarized as follows: the maximum CO2 concentration in the flue gas was increased with increasing waste oil sludge content in BOF. SO2 concentration in the flue gas was showed a tendency such as the highest CO2 concentration in the flue gas. With increasing waste oil sludge content in BOF, the combustion time was rather shorter although the increase of the CO2 concentration in the flue gas was delayed. Because the carbon conversion rate showed small difference with increasing the mixing ratio of waste oil sludge in BOF, BOF with the mixing ratio of waste oil sludge of 40% was effective for combustion. With decreasing the air/fuel ratio and the mixing ratio of waste oil sludge in BOF, activation energy and frequency factor were increased. The optimal air/fuel ratio for the combustion of BOF was 1.5.

Waterworks sludge is currently disposed after being used in water treatment, spending enormous cost. In order to protect the environment and avoid wasting, this study aims to develop high-temperature clay bodies using waterworks sludge for art tiles. As starting materials, feldspar, clay, and waterworks sludge, in place of silica, were used by triangular coordinates. According to the results indicated, the 40% sludge contained bodies showed good results which have low water absorption and high fracture strength in physical properties and color for art tile. The result of analyses showed mainly mullite and anorthite were developed in the bodies. Addition of Ca volume or firing at the higher temperature promoted the formation of anorthite and improved the strengths of the body. When mullite and anorthite coexisted in the bodies, fracture strength and water absorption showed maximum value, but overuse of Ca caused growth in porosity and absorption. The body color was affected by color development of iron. When mullite was doped by Fe3+ hematite appeared red and then increase of anorthite by addition of Ca, the magnetite was detected in the body and they appeared from dark gray to black shade color. Bodies of art tiles using recycled waste materials and waterworks sludge showed comparative properties such as strength, absorption, and bending strength to those of traditional tiles.

The large amount of waste oil sludge was generated from waste oil purification process, oil bunker, or the ocean plant. Although it has high calorific values, it should be treated as a designated waste. During the recycling process of construction and demolition wastes or the trimming process of woods, a lot of sawdust is produced. In this study, the feasibility of BOF (biomass and waste oil sludge fuel) as a renewable energy source was estimated. For manufacturing a BOF, a press type pelletizing was better than an extruder type and also 40 ~ 60% of mixing ratio in waste oil sludge was appropriate to produce a pellet. The pellet was 13 mm in diameter and 20 mm in length. There was no fixed carbon in waste oil sludge, and its carbon content and higher heating value were 63.90% and 9,110 kcal/kg, respectively. With an increse of mixing ratio of sawdust, the carbon content and heating value of the BOF were dropped, but fixed carbon content was increased. The heating value of BOF was in the range of 6,400 ~ 7,970 kcal/kg at the mixing ratio of 40 ~ 60% in waste oil sludge. It means that the BOF can be classified as the 1stgrade solid fuel. In TGA experiment carried out at heating rate of 10oC/min and under nitrogen atmosphere, thermal decomposition of sawdust was occurred in two steps, but waste oil sludge was destructed in one step. The initiated cracking temperature of sawdust and waste oil sludge was 300 and 280oC in respective and after 450oC the thermal decomposition process of sawdust was slowly progressed by 800oC in contrast to waste oil sludge. Thermal decomposition of waste oil sludge was finished around 600oC. It can be considered that this difference is due to the fixed carbon content. Thermal decomposition pattern for the pellet of mixing ratio over 50% in waste oil sludge was similar to that for waste oil sludge and thermal cracking was occurred between 300 and 350oC. As the mixing ratio of waste oil sludge in the pellet increased, the reaction of thermal cracking became fast.

In this study the effects of co-digestion of sewage sludge and food waste leachate on the anaerobic digestion efficiencyfrom sewage treatment facilities in S. Korea were investigated. For this study 15 facilities were selected including 9facilities treating sewage sludge only (S-Only) and 6 facilities treating sewage sludge and food waste leachate (S-MIX).The average volatile solid (VS) removal rate of S-Only was 30.7% and that of S-MIX was 45.2%. The COD removalrate of S-MIX (61.3%) was higher than that of S-Only (48.6%). It has been observed that the anaerobic digestion efficiencyof S-MIX was superior to that of S-Only because S-MIX contained more sufficient nutrient with higher VS contents andtotal solid (TS) contents emerging from food waste leachate. Therefore food waste leachate addition in sewage sludgeanaerobic digestion would be the preferred option to treat only sewage sludge.

The objectives of this research was to evaluate the anaerobic digestibility of waste activated sludge (herein after WAS)and waste beverages (herein after WB) in beverages manufacturing industry using actual plant under various conditions.In this study, anaerobic digestion with WAS and WB were evaluated according to different operating conditions. As thebasis operating conditions for anaerobic digestion, the reaction temperature was controlled at 35 and hydraulic retentiontime 30 days. WAS and WB were mixed at the ratio of 1:0, 9:1, 8:2, 7:3, 5:5, Respectively. The organic loadingrate (herein after OLR) was maintained less than 0.5kgVS/m3·day. Biogas productivity in accordance with VS was fedat the each mixing ratio with WAS and WB was increased from 0.92Nm3/kg VSfeed to 1.28Nm3/kg VSfeed, except mixingratio 5:5 (0.19Nm3/kg VSfeed). Also Biogas productivity in accordance with VS was removed at the each mixing ratiowith WAS and WB was increased from 1.13Nm3/kg VSrem to 1.81Nm3/kg VSrem, except mixing ratio 5:5 (0.35Nm3/kg VSrem). It was judged that pH was reduced with WB addition. From the results, it was judged that anaerobic digestionusing WAS and WB could be feasible.

The objective of this study was to find optimum pretreatment conditions of ozone and microwave for solubilizationof thickened waste activated sludge (TWAS). Response surface analysis was applied to determine the combination of ozoneconcentration (0.03 to 0.1g O3/g total solid (TS)) and microwave temperature (100~170oC). The temperature significantlyaffected the solubilization degree of sludge (p<0.01). Within the design boundaries, the conditions predicted to maximizethe solubilization degree of 41.6% were determined to be 0.065g O3/g TS and 170oC. On the other hand, the solubilizationdegree with the ozone pretreatment alone was 2.7 to 12.2% at 0.03~0.1g O3/g TS. The results show that the combinationof ozone and microwave pretreatments is effective in solubilization of TWAS.

A pink-colored china body has a feeling of warmth was manufactured using basalt sludge and white clay. Mechanicalproperties and microstructure of fired bodies were investigated by XRD, SEM and UV spectroscopic. The china bodycontaining 60wt% of basalt sludge fired at 1050oC for 30 min showed a bulk density of 1.76g/cm3, water absorption of16.25% and bending strength of 5.25N/mm2, and value of CIE L*, a*, b* is 67.64, 7.82, 8.17 respectively. A phase ofPiustite and maghemite included in basalt sludge transferred to phase of Hematite with a pink color under oxydationatmosphere, over 1,000oC. It appeared black when the firing temperature was higher than 1,100oC.

The objectives of this research was to evaluate the anaerobic digestibility of waste actizvated sludge (WAS) and wastebeverages in beverages manufacturing industry using BMP test under various conditions. Also, the effects of physical(ultrasonic) and biological (lactobacillus) solubilization process on anaerobic digestibility of WAS were thoroughlystudied. The soluble chemical oxygen demand (SCODCr)/total chemical oxygen demand (TCODCr) ratio of WAS was 0.15but the SCODCr/TCODCr ratio after solubilization was increased 17.5% by ultrasonic, 18.8% by lactobacillus respectively.The results of BMP test, methane gas productivity as mixing ratio of WAS and waste beverages were 156ml CH4/gCODCr,164ml CH4/gCODCr and 182ml CH4/g CODCr, respectively 9:1, 8:2, 7:3 before the solubilization of WAS. As themixing ratio of waste beverages increase, VFAs concentration and methane productivity was increased. Also, methanegas productivity as mixing ratio after the solubilization of WAS using ultrasonic and lactobacillus was increased3.3~11.3%, 11.1~15.2% respectively. From the results, it was judged that anaerobic digestion using WAS and wastebeverages could be feasible.

Fossil fuel combustion generates large amount of green house gas and it was considered major emission source causingglobal warming. For reducing green house gas, renewable energy resources have been emerged as an alternative energy.Among those resources, waste has been considered major resource as one of renewable energy, but it has been not utilizedsufficiently. In Korea, there are lots of efforts to utilize sewage sludge as one of renewable energy resources due to wasteto energy project of government. In this paper, sewage sludge was utilized as main fuel in order to recover heat energysource using oxy-fuel combustion in 30KWth circulating fluidized bed (CFB) pilot plant. Firstly, basic characteristics ofsewage sludge were analyzed and fuel feed rate was calculated by stoichiometry oxygen demand. For producing 30kwthermal energy in pilot plant, the feeding rate of sewage sludge was calculated as 13kg/hr. In oxy-fuel combustion, oxygeninjection rate was ranged from 21% to 40%. Fluidized material was more suitably circulated in which the rate of U/Umfwas calculated as 8 at 800oC. Secondly, Temperature and pressure gradients in circulation fluidized bed were comparedin case of oxy and air combustion. Temperature gradients was more uniformly depicted in case of 25% oxygen injectionwhen the value of excess oxygen was injected as 1.37. Combustion efficiency was greatest at the condition of 25% oxygeninjection rate. Also, the flue gas temperature was the highest at the condition of 25% oxygen injection rate. Lastly,combustion efficiency was presented in case of oxy and air combustion. Combustion efficiency was increased to 99.39%in case of 25% oxygen injection rate. In flue-gas composition from oxy-fuel combustion, nitrogen oxide was ranged from47ppm to 73ppm, and sulfur dioxide was ranged from 460ppm to 645ppm.