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황규대,김민호,고새봄 경희대학교 환경연구소 1995 環境硏究 論文集 Vol.6 No.-
Most of the municipal wastewater treatment plants operated in Korea are designed for high concentrations municipal sewage. However, activated sludge process employed by municipal wastewater traetment plant is operated at low organic loading. The objective of this study was to determine optimum operating condition of activated sludge process for treatment of low concentration municipal sewage. Three bench scale activated sludge reactors were operated to investigate the effect of HRT and SRT on the COD and TKN removal efficiency. The average concentration of TSS, SCOD, SBOD and TKN in influent were 118mg/l. 61mg/l, 2lmg/l, and 12mg/l, respectively. The activated sludge reactors operated with various HRT and SRT showed about 89-93% TSS removal efficiency. HRT and SRT does not affect the TSS removal efficiency of actvatied sludge process significantly. However, HRT affected the SCOD removal efficiency slightly. As the HRT decreases from 13hours to 3hours, the SCOD removal efficiency decreases from 67% to 56%. The average effluent TCOD concentration of the reactor operated with 3hours of HRT was approximatly 40-45mg/l. Biological yield coefficient(Y) range from 0.79mgMLSS/mgCODrem. to 1.35mg MLSS/mg CO Drem. Hydraulic detention time affected the rate of sludge production. Low contration municipal sewage can be treated with 3hours of hydraulic detention time without of affect quality deterioration SRT did not affect the COD removal efficiency.
하수슬러지의 산과 초음파 처리에 따른 ECP(exocellular polymers)의 거동이 탈수성과 침강성에 미치는 영향
황선진,정규호,황규대 대한상하수도학회 2002 상하수도학회지 Vol.16 No.6
The effects on dewaterability and settlability of wastewater sludge according to acid and ultrasonic pretreatment which was expected to change ECP (exocellular polymers) compounds in the sludge and bulk solution was investigated. Though ECP which attached to the sludge could stimulate coagulation of sludge particles by bridging effect, but ECP in the bulk solution deteriorated dewaterability and settlability of the sludge on the contrary. That is as the pH of the solution was decreased to 3 gradually by acid treatment, proportionally ECP in the bulk solution was attached to the sludge flocs and resulted in improvement of dewaterability and settlability of the sludge. In case of ultrasonic pretreatment, with proportional to the intensity and duration of ultrasonic application, ECP was detached and extracted from sludge flocs and these phenomena deteriorated dewaterability and settlability. Also because of the increasement of minute sludge particles according to ultrasonic, dewaterability became so much the worse.
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.