大規模 染色工業團地 廢水處理의 活性汚泥工程 最適化

朴永圭,李哲熙,李武康 嶺南大學校 環境問題硏究所 1982 環境硏究 Vol.2 No.1

This studies provided the optimization for the design treating activated sludge process for the waste water from the large-scale dyeing industrial complex. Two processes were here used to treat the dyeing waste water, which one is treated with raw waste water directly by the activated sludge process and the other treated by the coagulation follwing with activated sludge process. Design parameters as maximum specific substrate utillization rate(??) and half velocity coefficient (??) were obtained for each process. And also discussed the optimization conitions for the design of the activated sludge process with these parameters.

凝集一活性汚泥工程에 의한 폴리에스테르 減量廢水가 主인 染色廢水處理

朴永圭,李哲熙,梁龍雲 嶺南大學校 環境問題硏究所 1989 環境硏究 Vol.8 No.2

This paper prevides the optimal conditions treating with the coagulation process and the activated sludge process for dyeing wastewater composed of 65% polyester loss weight finish wastewater and the rests, various dyeing wastewater. The results are shown as follows : 1. The alum is the most economical coagulant among ferric chloride, ferrous sulfate and alum by comparison sludge yields and the cost of operation, and the efficiency of COD removal is approximate 24% with 800mg/ℓ of alum (7.2% Al₂O₃) at ??. 2. The optimization conditons of COD volumetric loading and retention time for the design of the activated sludge process following the coagulation precipitation are 0.6kg COD/ m³· D(0.15kg COD/kg MLSS. D) and 24hr. 3. Removal efficiency of COD treated with the activated sludge process following the coagulation precipitation is 86% at 30℃, and decreased 75% at 40℃. 4. It is confirmed that the activated sludge process following coagulation precipitation method provides better treatment efficiency than the coagulation precipitation method following the actived sludge process.

洛東江 水質汚染에 따른 淨水處理 改善에 關한 硏究(I)

朴永圭,李哲熙,曺秉樂,金水源 嶺南大學校 環境問題硏究所 1981 環境硏究 Vol.1 No.1

The largest Water-Treatment Plant in Daegu draws its raw water from the nackdong River which is increasingly polluted by the growth of urban population and industries around the Daegu City. In conventional water treatment process, the efficiency of the production of treated water is affected by algae concentration in the raw water, especiaally in April, May and September in the dry season. A pilot plant study on the efficiency of the removal of the suspended solids by dissolved air flotation was conducted and the results are summarized as follows : 1. It was confirmed that the production of treated water by the conventional water treatment process decreased especially in dry months when the efficiency of algal removal is low and frequency of back washing is higher than normal. 2. Influent suspended solids and influent turbidity of the raw water of the Nackdong River are related in the formula : Si = 1.6 Ti. From this equation, we derived A/S = (R/A) 1.2 Sa (f.p-1) / 1.6 Ti as control function of dissolved air flotation, we also determinded optimum dosage of alum for optimum conditions of coagulation at the various turbidities of raw water. 3. Polyelectrolyte added increased the effect of flotation in the coagulation process with stabilzation for floc. Treatment effect is also decrased with partial drops of floated particles when sludge of flotation tank is not removdd for a long time. 4. The efficiency of the suspended solids removal in the raw water appears to be fast similar between the air flotation process and the drinking water in the case of the air flotation process. because the detention time needed only 20 minute.

아세톤-물혼합용매에서 trans-[Co(en)_2Cl_2]^+ 및 trans-[Co(1,3-pn)_2Cl_2]^+ 이온의 가용매 분해 반응에 미치는 압력과 용매조성의 영향

朴裕哲,卞鍾轍,金京美,趙靈濟 慶北大學校 物理化學硏究所 1985 硏究論文集 Vol.6 No.-

The rates of solvolysis of trans-[Co(en)_2Cl_2]^+ and trans-[Co(1,3-pn)_2Cl_2]^+, in which en and 1,3-pn are ethylenediamine and 1,3-propylenediamine resepectively, have been investigated using conductometric and spectrophotometric methods at various pressures up to 2,000 bar in acetone-water mixture. The activation volumes obtained from the pressure effect on rate constants were small and positive values in both complexes of trans-[Co(en)_2Cl_2]^+ and trans-[Co(1,3-pn)_2Cl_2]^+. These results are discussed in terms of dissociative mechanism (S_NI) for the solvolysis of both complexes. The importance of solvent composition on the reaction is further confirmed by application of a free energy cycle. It is concluded from the free energy cycle that the effect of solvation of transition state in the solvolysis of both complexes is more dominant than that of initial state. In addition to that, it is shown that the character of S_NI is further increased with increasing the content of acetone.

上水處理에서 HCO₃濃度가 凝集效果에 미치는 影響에 關하여

朴永圭,李哲熙,曺秉樂,朴勝吉 嶺南大學校 環境問題硏究所 1982 環境硏究 Vol.2 No.1

In this paper is presented the effect of ?? concentration on the efficiency of the turbidity removal by flocculation with alum or ferric sulfate. It is confirmed that pH range of the optimal flocculation conditions for the raw water contained the initial ?? concentration of 80mg/1 is expanded to 5-8 or 4-6, res-pectively, by treating with alum and ferric sulfate as a coagulants. The residual turbidity treated water is also decreased to 2NTU with alum and to 4NUT for the case of ferric sulfate. The determined agglomeration rate constant, K₁, and erosion rate constant, K₂, for floc are as follows; coagulants agglomeration rate constant erosion rate constant (initial ?? conc.) K₁ K₂ alum(80mg/1) 0.29 0.3 ferric sulfate(40mg/1) 0.35 0.26 Here is discussed the number of the reactor for the continuous flow needed to treating below 5NTU and also discussed treated watar quality which is predicted from kinetic model by using agglomeration rate constant, K₁, and erosion rate constant, k₂.

琴湖江底質中에 含有된 銅의 汚染經路

朴永圭,李哲熙,魯明英 嶺南大學校 環境問題硏究所 1987 環境硏究 Vol.6 No.2

The study was carried out on the pathway and the trend of copper pollution of sediments in the Kumho River. It was difficult to establish the actual copper pollution level of sediment only with a data on copper contents sediment because measured values of copper fluctuated intensely even in an identical sampling station. Then the trianglar coordinate chart method was applied to compare the pictures of copper pollution among different sampling stations with several items (Cd, Cr, Zn, Pb, Mn and Fe) of the measurement. It was useful for the selection of metals in trianglar coordinate chart to check the probable distribution of metal concentration in sediments. The combination of copper, cadimum and manganese was appeared to be most excellant among fifteen combination of metals in trianglar coordinate charts for the investigation of copper pollution. The plot in the Cu-Cd-Mn trianglar coordinate chars successfully account for the pathway of copper pollution of sediments.

連續回分式 反應器에서 有機性 廢水의 分解 Phenol이 미치는 影響

朴永圭,姜信寬,李哲熙 嶺南大學校 環境問題硏究所 1985 環境硏究 Vol.5 No.2

The synthetic Wastewater mixed with the sewage and phenol was treated by the sequencing batch reactor process to investigate the effect of phenol toxidity on the biodegradation. According as the phenol concentration of the raw wastewater was increased, the rate coefficient of the substrate removal, ??, by the adsorption during the fill period and the rate coefficient of the substrate biodegradation, ??, during the aeration period were decreased for phenol toxidity, but the activated energy of the substrate biodegradation, the sludge volume index and the suspended soild concentration were increased. It was found that the removal efficiency of COD was obtained more than 90% after the aeration period below 267(mg/l) of the phenol concentration, and that the removal efficiency was remarkably decreased for the toxidity at 333(mg/l) of the phenol concentration.

多變量分析에 依한 琴湖江의 水質評價

朴永圭,李哲熙,鄭輝洙 嶺南大學校 環境問題硏究所 1986 環境硏究 Vol.6 No.1

The results of the multivaraite analysis in order to estimate water quality of the Kum-ho river were as follows: 1. The water quality of the Kum-ho river estimated by the factor scores were seasonably homogeneous throughout the period of this research. 2. The cumulative proportion includings the third principal components was ranked as high as 97.8%. 3. The first principal components except water temperature, which the factor loading of which marked over 0.9, are composed of 14 items of water quality, and it was thought to be closely related to the river pollution caused by human activities and the waste water from near by factories. 4. In the relationship between the water quality and the flow of Kum-ho river was founded that COD and the factor scores related closely to each other from the relationship. Therefore, the run-off loading rate could be explained most completely by COD(Cr) and factor scores. And the run-off loading rate of the Kum-ho river basin showed almost no variation at the lower reaches, where the pollutions were mainly contributed by the point sources.

상수고도처리에서 UF-오존-생물활성탄의 처리능평가

박영규,이철희 嶺南大學校 環境問題硏究所 1997 環境硏究 Vol.16 No.2

水溶液中의 DodecyI Benzene Sulfonate의 오존 酸化

朴永圭,李哲熙,韓明鎬 영남대학교 공업기술연구소 1985 연구보고 Vol.13 No.2

This study was conducted by the method of ozone demand flask to ozonize dodecyl benzene sulfonate (DBS) which is the principal component of the synthetic detergents. The results are summarized as follow; 1. For ozonization of DBS in aqueous solution, DBS was easily oxidized increasing pH and temperature. 2. The rate constant of the reaction, k is 1.70 min??, reaction order of DBS, n is 1.40 and the reaction order of ozone, m is 1.25 in the DBS-ozone system. 3. DBS removal rate is proportional to ozone dosage. 4. The utilizaion coefficient of ozone is directly proportional to initial concentration fo DBS because the ozone demand per removed DBS is increased according to decreasing initial concentration of DBS. And the ratio of initial concentration of DBS versus utilizationcoefficient is 0.037. 5 The removal rates of DBS, Fe, and Mn by ozone were in the order of Fe, Mn, and DBS in its rate. 6. For ozonization of DBS, Fe, and Mn in mixed-aqueous solution, DBS and Fe were preferential but Mn was not preferential.