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RISS 인기검색어
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- 저자 : 장준기 ( Jang Jun Gi ) (검색결과 3 건)
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양든폐수 고형물의 농도변화에 따른 탈질미생물의 동역학적 계수에 관한 연구
황규대(Gye Dae Whang),황선진(Sun Jin Hwang),장준기(Jun Gi Jang) 한국물환경학회 2000 한국물환경학회지 Vol.16 No.5
The objective of this study was to examine the effects of solid concentrations of influent on the removal efficiency of organic matter and nitrate and on the biological kinetic coefficients. Each set of experiments consists of three bench scale anoxic reactors which were operated under different SRT to determine the biological kinetic coefficients and the optimum operating conditions for COD and nitrate removal. In anoxic reactors operated with 18hr of HRT, with the organic loading ranging 2.81∼4.70㎏TCODcr/㎥/day and TSS loading ranging 0.40∼2.49㎏TSS/㎥/day the removal efficiency of TCOD_(cr) and SCOD_(cr) were in the range of about 72∼83% and 62∼85%, respectively. Influent TSS concentration affects the removal efficiency of organic matter and nitrate. With high influent TSS concentration, COD removal efficiency was decreased and nitrate efficiency was increased slightly. To improve the removal efficiency of nitrate. HRT should be increased properly to extend the reaction time of denitrifying microorganism. SRT does not affect the COD removal efficiency and sludge settling characteristic. COD requirement for NO₃^--N removal was ranged from 2.19 to 3.34㎎SCOD_(cr)/㎎NO₃^-N_((Removed)), and was influenced by the influent TSS. Specific denitrification rates were ranged from 0.08 to 0.15㎎N/㎎MLVSS/day. Biological kinetic coefficients Y-t and K-d value of reactor Run-1 which received influent of high TSS concentration were 2.19㎎MLVSS/㎎COD_(cr) and 0.29day^(-1). These coefficients decreased to 0.50㎎MLVSS/㎎COD_(cr) and 0.l0day^(-1) for reactor Run-2 which received influent of low TSS concentration.
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생슬러지의 초음파 조사에 의한 BNR공정의 탄소원 타당성 연구
황규대 ( Hwang Gyu Dae ),강재순 ( Kang Jae Sun ),장준기 ( Jang Jun Gi ) 한국물환경학회 2003 한국물환경학회지 Vol.19 No.5
In the sonochemical reaction, the solid of sludge can be disintegrated and solubilized by hydromechanical shear force, pyrolysis, and free radical attack during the cavitation. This study was performed to evaluate the feasibility of ultrasonically treated raw sludge as carbon source for biological denitrification and phosphate release. A 530W ultrasonic processor with a frequency of 40kHz was used to sonicated the raw sludge from wastewater plant. To find the optimal SCODcr buildup condition. we examined the effects of solid concentration of sludge, ultrasonic density, irradiation time, aeration, and pH on TSS and SCODcr concentration during the ultrasonic irradiation on raw sludge. Ultrasonic irradiation was applied to raw sludges with different solid contents (1, 3, and 5%.) and different ultrasonic density (0.04, 0.06, and 0.12W/rnl). Ultrasonic irradiation showed a rapid and significant decrease in TSS concentration in raw sludge. The kinetic of the degradation rates of TSS by ultrasonic irradiation was satisfactorily described by a pseudo-first order reaction. The degradation efficiency of solid in raw sludges were over 60%, and ranged from 3.0 to 7.2 ㎎TSS/W . hr. Also the SCODcr yields of 2.1 -3.2 ㎎SCODcr/W·hr in this study were observed and depended strongly on ultrasonic density. With aeration. the sonication on raw sludge further increased SCODcr concentration. However, it is less effective to irradiate ultrasonically the pH-adiusted raw sludge. The optimal operating condition to increase soluble organics was to sonicate the sludge with 5% TSS under the ultrasonic density of 0.12W/ml and showed the yield of 3.2 ㎎SCODcr/W . hr. Also the sonicated sludges with different sonication time(ranging between 0-9hrs) under 0.I2W/ml were fed into the batch reactors as carbon source. Those ones had a strong influence on the denitrification rate and the P-release concentration. The specific denitrification rates of batch reactors varied within a range from 0.46 to 1.97 mgNO₃-N/gVSS·hr, and 1.33-1.85 gSCODCr consumed/gNO₃-N removed was observed. The concentration of phosphate which was released by poly P microbes were in the range of 0-4.75㎎/L. and 0.55-1.22gPO₄-P released /gSCODcr consumed was showed. The economically most competitive sludge as carbon source was one under 3hr sonication time to accomplish the high denitrification rate and the P-release concentration. Therefore, the ultrasonically treated sludge can be another carbon source for BNR process.
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