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최용수,조재현 ( Yong Su Choi,Jae Hyun Cho ) 한국물환경학회 1994 한국물환경학회지 Vol.10 No.4
This study was conducted to develop an advanced chemical wastewater treatment technology using new coagulants extracted from vermiculite. In order to make an optimal vermiculite extract solution(VES) that includes various cations useful for coagulation, extraction experiments by sulfuric acid were carried out. The characteristic of VES as coagulants was evaluated and compared to the existing inorganic coagulants, alum and ferric chloride. According to the experimental results, the concentrations of Al^(3+), Fe^(3+), ㎎^(2+), and Si^(4+) cations in VES were increasing with the increase of particle sizes, sulfuric acid concentration below 10N, temperature up to 100℃. and agitation time. It is found that VES can be applicated to the treatment of alkaline wastewater without pH control, because VES has various cations to make a coagulation with suspended colloids in a diverse pH range. The SS and COD removal efficiencies from the tannery wastewater by the dose of 0.2g-vermiculite(23.8㎎-Al^(3+), 27.6㎎-Fe^(3+), 33.6㎎-㎎^(2+), 0.2㎎-Si^(4+))/ℓ VES were higher than 80% and 30%, respectively, and independent on pH values. Especially a high COD removal rate of 61% was shown at the dose of 0.6g-vermiculite (72㎎-Al^(4+), 82.8㎎- Fe^(3+), 100.8㎎-㎎^(2+) , 0.6㎎-Si^(4+))/ℓ VES. However dosage more than lg(78.9㎎- A1^(3+))/ℓ of alum or 0.5g(103.6㎎-Fe^(3+))/ℓ of ferric chloride was required to maintain SS removal rates higher than 80%. Alkalinity and pH in the reactor decreased with the dose of VES, for example pH value of tannery wastewater decreased to 8 at the dose of 0.4g- vermiculite(47.6㎎-Al^(3+), 55.6㎎-Fe^(3+), 67.6㎎-㎎^(2+), 0.4㎎-Si^(4+))/ℓ VES. Turbidity removal rates in the reactor were 91∼93% at the dose of 0.l∼0.3g/ℓ VES. Another advantage from the coagulation by VES is less sludge generation in comparison with other inorganic coagulants.
최용수,신응배,이영대 ( Yong Su Choi,Eung Bai Shin,Young Dae Lee ) 한국물환경학회 1995 한국물환경학회지 Vol.11 No.3
Experimental study for the removal of organic and phosphorus in synthetic wastewater was conducted in a single reactor including anaerobic-anoxic-aerobic zone and clarifier. Attempts were made to delineate phosphorus removal mechanisms and to evaluate the removal efficiencies of organic and phosphorus with different internal recycle ratios, N/P ratios and various SRT conditions. The removal efficiencies of TOC, BOD and COD were observed to be higher than 95%, 90% and 90% respectively with aerobic recycle rates of 100% and 200%. It was recognized that the optimal operational condition for phosphorus removal was the aerobic internal recycle rate of 100% with the inlet fraction 0.2. The percent removal efficiencies were 92.1% for T-P and 90.1% for PO-4-P. While, large differences in the removal of phosphorus with N/P ratios were observed; at influent TKN/T-P of 2.5, 3.6 and 5.1, removal efficiencies for T-P were 88.7%, 67.6% and 55.9%, respectively. Those removal efficiencies decreased with the increase of N/P ratio in wastewater charged. In case of SRT, removal rates of 93.5% for T-P and 92.1% for PO₄-P were observed with the solid retention time of l0 days. These rates are higher than results in 5 days and 20 days of SRT. Thus high removal efficiencies for organic substances and phosphorus in wastewater were simultaneously obtained by a new biological process with a single reactor.
03 구두발표 : 구두발표(OA) - 농업환경 및 토양,수질 분야 ; OA-03 : 사양토에서 왕겨 바이오차 시용에 따른 암모늄태 질소(NH4-N) 흡착특성 및 반응속도
최용수 ( Yong Su Choi ),김성철 ( Sung Chul Kim ),신중두 ( Joung Du Shin ) 한국환경농학회 2015 한국환경농학회 학술대회집 Vol.2015 No.-
Objective of this study was to investigate adsorption characteristic and kinetic model of NH4-N to biochar produced from rice hull in respective to mitigation of greenhouse gases. NH4-N concentration was analyzed by UV spectrophotometer. For the experiment, the soil texture used in this study was sandy loam, and application rate of chemical fertilizer and pig compost were 420-200-370 kg ha-1 (N-P-K) and 5,500 kg ha-1 as recommended amount after soil test for corn cultivation. Biochar treatments were 0.2-5% to soil weigh. Its adsorption characteristic was investigated with application of Langmuir isotherm, and pseudo-first order kinetic model and pseudo-second order kinetic model were used as kinetic models. Adsorption amount and removal rates of NH4-N were 39.3 mg g-1 and 28.0% in 0.2% biochar treatment, respectively. The sorption of NH4-N to biochar was fitted well by Langmuir model because it was observed that dimensionless constant (RL) was 0.48. The maximum adsorption amount (qm) and binding strength constant (b) were calculated as 4.1 mg g-1 and 0.01 L mg-1 in Langmuir isotherm, respectively. The pseudo-second order kinetic models was more appropriate than pseudo-first order kinetic model for high correlation coefficient (r2) of pseudo-second order kinetic model. Therefor, biochar produced from rice hull could reduce N2O by adsorbing NH4-N to biochar cooperated in sandy loam.
혐기 및 2단 교호(交互) 간헐포기조를 이용한 하수고도처리에 관한 연구: 파일럿 규모의 실험결과를 중심으로
최용수 ( Yong Su Choi ),홍석원 ( Seok Won Hong ),권기한 ( Gi Han Kwon ) 한국물환경학회 2004 한국물환경학회지 Vol.20 No.3
The performance of a newly designed wastewater treatment process equipped with an anaerobic and two intermittent aeration tanks operated alternately was investigated. During the experimental period, several types of cyclic operating schedules with different aeration and non aeration time were examined for the optimization. At all modes, the removals of organic matter and SS were highly achieved. With respect to T-N removal, however, the cycle length for aeration on/off affected the efficiencies. At the optimal operating mode, the ORP bending point indicating the disappearance of nitrate was observed. Considering the influent wastewater characteristics and cyclic operating schedules, it can be suggested that T-P removal is much more BOD/T-P ratio and/or its load dependant rather than the aeration on/off time. The results obtained from pilot-scale test showed the competitive advantage of this alternating process through an omission of nitrate recycle and operational flexibility against influent load variations when comparing with other continuous flow processes.
04 포스터 발표 : 토양 환경 분야(PS) ; PS-08 : 참나무 바이오차의 인산염 인(PO4-P) 흡착특성
최용수 ( Yong Su Choi ),홍승길 ( Seung Gil Hong ),김성철 ( Sung Chul Kim ),신중두 ( Joung Du Shin ) 한국환경농학회 2015 한국환경농학회 학술대회집 Vol.2015 No.-
Objective of this study was to investigate adsorption characteristics of PO4-P to biochar produced from oak tree in respective to reduce eutrophication from runoff water in cropland. PO4-P concentration was analyzed by UV spectrophotometer. For adsorption experiment, input amount of biochar was varied from 4 to 20 g L-1 with 30 mg L-1 PO4-P solution. Adsorption amounts and removal rates of PO4-P was increased at 33.3% in 4-14 g L-1, and increased at 28.6% in 4-16 g L-1, respectively. Adsorption characteristics of biochar were investigated with application of Langmuir isotherm. The maximum adsorption amount(qm) and binding strength constant(b) were calculated ad 0.1 mg g-1, and 0.1 L mg-1, respectively. The sorption of PO4-P to biochar was fitted well by Langmuir model because it was observed that dimensionless constant(RL) was 0.4. It was indicated that biochar is favorably adsorbed PO4-P because this value lie within 0<RL<1. Therefore, biochar produced from oak tree could be used as adsorbent for reduce eutrophication from runoff water in cropland.
성일화,최용수,박흥석,유명진 ( Il Wha Sung,Yong Su Choi,Hung Suck Park,Myong Jin Yu ) 한국물환경학회 1994 한국물환경학회지 Vol.10 No.1
An experiment was conducted in order to examine the effect of commercial additive which contained humus plus minerals. The additive with the trade name $quot;Biothrough$quot; was used in this study. In reactors A and B, an additional aeration tank for 12 hours detention of recycle sludge was installed and $quot;Biothrough$quot; was submerged inside the tank. In reactor C, $quot;Biothrough$quot; was submerged inside reactor and was not used in reactor D, the control unit. The experimental results are summarized as follows ; SVI was lowest for reactor A at the FiM ratio of both 0.15 to 0.83 and 0.14 to 0.51 ㎏ BOD/㎏ MLSS·day. The biopolymer excretion per unit weight of activated sludge increased in accordance with the increase of HRT. The results indicated that the reactors attached with additive were more efficient in improving the settling characteristics of activated sludge. In that respect, it was thought that the attachment of additive in tank improved activated sludge characteristics and further detention led the microbes towards favorable endogenous phase where more excretion of biopolymer was possible. Such increase of biopolymer excretion improved the aggregation and in turn the settle ability of activated sludges.
고농도 질산성질소와 Ca<sup>+2</sup>을 함유한 산세폐수의 효과적인 처리를 위한 SBR 공정의 적용
김승준,최용수,배우근,Kim, Seung-jun,Choi, Yong-su,Bae, Woo-keun 한국물환경학회 2006 한국물환경학회지 Vol.22 No.2
This research presents results from laboratory and pilot-scale experiments to remove high-nitrate in pickling wastewater using the sequencing batch reactor (SBR) as a biological method. During the experimental periods, the influent concentrations of NOx-N and $Ca^{+2}$ were analyzed to be 350-1,600 and 700-800 mg/L, respectively. In order to provide carbon source for denitrification, methanol has been added in proportion to the influent nitrate loading. The mean concentrations of MLSS and MLVSS, the fraction of volatile solids in sludge and the sludge volume index were measured to be 27 g/L, 5 g/L, 18.5% and 7.5, respectively. The solid retention time was kept in the range of 18 to 22 days, specific denitrification rate ($U_{dn}$) was $0.301g{NO_3}^--N/gVSS/day$. The oxidized nitrogen concentration of effluent ranged 2-34 mg/L with an average of 5.2 mg/L, the overall reduction in total nitrogen was more than 99.2%. In order to treat the pickling wastewater including the high concentration of nitrate and $Ca^{+2}$, the continuous flow process is not suitable because the specific gravity of the sludge is considerably increased by $Ca^{+2}$, thus the SBR process is shown to be very effective to treat the pickling wastewater.