질소 처리에 있어서 A2/O-BAF 공정 평가

신관우 ( Gwan Woo Shin ),신민수 ( Min Su Shin ),강민구 ( Min Koo Kang ),김금용 ( Keum Yong Kim ),류홍덕 ( Hong Duck Ryu ),이상일 ( Sang Ill Lee ) 한국수처리학회 2012 한국수처리학회지 Vol.20 No.3

This study was initiated to evaluate a proposed A2/O-BAF system, in which a biological aerated filter (BAF) system was incorporated into a A2/O system, by comparing it with the conventional A2/O system. The evaluation was mainly focused on the nitrogen removal. Long term lab-scale experimental results presented that the NH4-N removal of the A2/Q-BAF system was 60.2 and 34.8% higher than that of the conventional A2/O system at the hydraulic retention time (HRT) of 6 and 4 h, respectively, and the similar tendency was observed in the TCQD and SCOD removal, These results would be attributable to the additional BAF installation in the conventional A2/O process, The untreated NH4-N in A2/O system were effectively removed in the BAF reactor. Specifically, it was revealed that the BAF reactor exerted much more ability in treating NH4-N at short HRT. Consequently, it is believed that the proposed A2/O-BAF system could be effectively applied to the wastewater treatment at short HRT and even in winter season for the removal of nitrogen.

초음파 전처리를 이용한 하수슬러지 분해 및 열/알칼리와 병합처리

신관우 ( Gwan Woo Shin ),이한슬 ( Han Seul Lee ),강민구 ( Min Koo Kang ),이상일 ( Sang Ill Lee ) 한국수처리학회 2014 한국수처리학회지 Vol.22 No.2

In this study, the sonication according to MLSS and temperature was performed with the processing for the solubilization of the sewage sludge and compared it with performing combined use of Alkali . The disintegration of the organic component could be confirmed through the sonication and Alkali treatment. In the change of SCOD/MLSS according to MLSS, MLSS 7,200 mg/L showed the optimum sludge disintegration. In the change of SCOD/MLSS according to temperature, when temperature is 80℃, decomposed organic matter is the most but, it makes no difference when temperature is 70℃, so we decide best temperature to 70℃ considering energy consumption on applying heat. In the change of SCOD/MLSS according to temperature holding time, 1 hour holding time showed the optimum sludge disintegration. In the change of SCOD/MLSS according to the NaOH density, the NaOH of the high concentration not was exposed to be of effect to the sludge disassembly efficiency by the ultrasonic wave.

인 제거를 위한 흡착제로서 란타늄-황토 복합체의 흡착특성

신관우(Gwan Woo Shin),추연덕(Yeon Duk Choo),김금용(Keum Yong Kim),류홍덕(Hong Duck Ryu),이상일(Sang Ill Lee) 大韓環境工學會 2011 대한환경공학회지 Vol.33 No.2

본 연구는 호소나 댐과 같은 닫힌 수계에서 부영양화의 주요물질인 인을 제거하기 위한 란타늄-황토 복합체 개발에 관한 것이다. 연구 결과 황토 1 g에 붙을 수 있는 최적 란타늄 양은 2.68 mg이었으며, 인 제거를 위한 최적 반응시간은 황토에 부착된 란타늄 양이 증가할수록 최적 반응시간은 단축되었다. 수중의 인 농도는 제조된 란타늄-황토 복합체의 주입량이 증가함에 따라 인 제거율이 증가하는 경향을 보였다. 본 연구에서 란타늄이 부착되지 않은 황토와 란타늄이 첨가된 복합체를 사용한 경우에서 인 제거 경향이 달랐다. 수중의 인을 완벽하게 제거하기 위해 소요되는 황토 및 란타늄-황토량은 후자가 전자보다 약 1.5~10배 적게 소요되었다. 란타늄-황토 복합체의 인 흡착 경향은 Freundlich 및 Langmuir 등온흡착식과 일치하는 것으로 관찰되었다. 수중의 인 제거시 제조된 복합체의 pH에 대한 영향은 넓은 pH범위(pH 5~8)에서 높은 제거율을 보임으로써 자연수계에 직접 적용할 수 있음을 확인하였다. 또한 제조된 복합체 살포시 침전시간은 30분 이내로 짧았다. 침전되는 동안 수중의 인을 흡착하면서 침전되며, 인 농도를 안정적으로 유지할 수 있을 것으로 판단된다. In this work, a composite formed by adding loess with lanthanium ("La-Loess") was proposed for effective removal of phosphate found in confined water bodies such as lake and reservoir. It was found that the theoretical maximum amount of lanthanum that can be attached to Loess was 2.68 mg La/g Loess. The phosphate removal was enhanced as an added amount of La-Loess composite increased. Furthermore, there was a noticeable difference in phosphate removal between Loess and La-Loess as the latter required 1.5 to 10 times less Loess than the former. Both Isotherm equations of Freundlich and Langmuir can be used to explain the phosphate adsorption characteristics in using La-Loess composites. The phosphate removal was very effective in the pH range of 5~8, which means that the proposed adsorbent can be directly applied to natural water without adjusting pH. Also, the La-Loess composites were well settled within 30 min without causing turbidity in water. Consequently, the proposed La-Loess can be strongly recommended for phosphate removal in confined water bodies.

호소 퇴적층으로부터 용출되는 인 제거를 위한 황토 복합체 개발

신관우 ( Gwan Woo Shin ),김금용 ( Keum Yong Kim ),이상일 ( Sang Ill Lee ) 한국물환경학회 2012 한국물환경학회지 Vol.28 No.1

In this study, loess composites, loess with lanthanum and with aluminum, were made and evaluated for treatment of phosphorus removal in natural water system. Desiccation method for production of loess composite was superior to centrifugation method in obtaining high concentrated composites of lanthanum and aluminum. Washing of loess lanthanum composite by water did not deteriorat the lanthanum concentration in the composite, but this lowered the aluminum concentration of loess aluminum composite. Total of 15 and 37.5% of aluminum contents were removed after first washing treatment in aluminum loess of 0.05% and 0.1% respectively. However, no more aluminum loss was monitored with increase of washing times. Phosphorus removal efficiencies were not decreased with washed loess aluminum composite. Phosphorus removal was successfully achieved by adsorption of phosphate to loess composite at pH range of 5.0~8.0. Freundlich and Langmuir adsorption isotherm was observed in the adsorption of phosphate for loess composite. Dosages of 0.05% and 0.1% lanthanum composite for 95% of phosphorus removal could reduce its usage amount to 25% and 50%, respectively, comparing with dosage of loess alone. Dosages of 0.05% and 0.1% aluminum composite could reduce its usage amount to 48% and 63%, respectively.

알루미늄-황토 복합체의 인 제거 특성

신관우(Gwan Woo Shin),김진식(Jin Sik Kim),김금용(Keum Yong Kim),이상일(Sang Ill Lee) 大韓環境工學會 2011 대한환경공학회지 Vol.33 No.7

본 연구는 호소의 부영양화의 원인물질인 인을 효과적으로 제거하고자 개발된 알루미늄-황토 및 란타늄-황토 복합체의 흡착 특성을 평가 하였다. 연구 결과 황토 1 g에 주입된 알루미늄과 란타늄 양이 증가할수록 결합된 양이 비례하여 증가하였다. 알루미늄과 란타늄이 첨가되지 않은 황토와 0.5, 1, 2 mg의 알루미늄과 0.5, 1, 3 mg의 란타늄이 첨가된 복합체를 사용한 경우에 인 제거효율이 다르게 나타났다. 수중의 인 1 mg PO₄(3-)-P/L를 모두 제거하는데 요구되는 양은 알루미늄-황토 복합체가 순수 황토에 비하여 약 2~10배 적은 것으로 나타났다. 또한 란타늄-황토의 경우에는 약 1.5~10배 적게 요구되었다. 제조된 알루미늄-황토, 란타늄-황토 복합체를 수세한 후에 인 흡착 정도를 관찰하기 위하여 복합체를 1~3회까지 수세한 후 결과를 관찰하였는데 수세전과 비교하여 인 제거효율 차이는 크지 않은 것으로 나타났다. pH에 따른 영향은 pH 5~8에서 높은 인 제거율을 보임으로써 개발된 복합체는 일반 자연수계에 살포시 탁월한 인 제거 효능을 보일 것으로 판단된다. 또한 제조된 알루미늄-황토 및 란타늄-황토 복합체는 30분 이내에 빠르게 침전되기 때문에 호소 바닥에서 빠른 시간 내에 안정화 되어 수중의 인과 퇴적층에서 용출되는 인 제어를 담당할 것으로 사료된다. In this work, the adsorption characteristic of the composites by adding loess with aluminum ("Al-loess") and Loess with lanthanum ("La-loess") which have been developed to effectively remove phosphorus, the substance which causes the eutrophic lake has been evaluated. According to the result of the work, as the amount of aluminum or lanthanum put in 1g of loess increases, the combined amount also increases accordingly. When the loess with no aluminum or lanthanum attached was used, the rate of removing phosphorus was different in comparison with the case of using the composites of 0.5, 1 and 2 mg of aluminum and 0.5, 1 and 3 mg of lanthanum in each gram of loess. It was observed the amount required to remove 1 mg PO₄(3-)-P/L of phosphorus completely is approximately 2 to 10 times less for the composite of Al-loess than loess alone. Also, in case of the composite of La-loess, the amount was decreased by about 1.5 to 10 times. In order to observe the rate of adsorption phosphorus with Al-loess and La-loess, the composites were used for the observation up to three times by water washing. As a result, the water washing of the composite did not affect phosphorus removal. According to the effect of pH, there is a high rate of removing phosphorus in the pH range of 5~8. It seems that the developed composite will effectively remove phosphorus when it is spread in the natural water system. Also, since Al-loess and La-loess composites are rapidly precipitated within 30 minutes, it is stabilized quickly at the bottom of the eutrophic lake and becomes responsible for the removal of phosphorus in water and eluted from the water and the sedimentary layer.

레미콘 슬러지를 이용한 불소제거

강민구(Min Koo Kang),신관우(Gwan Woo Shin),이상일(Sang Ill Lee) 大韓環境工學會 2013 대한환경공학회지 Vol.35 No.11

본 연구의 목적은 칼슘염을 함유한 레미콘 슬러지를 이용하여 불소함유폐수를 물에 난용성인 CaF₂ 화합물 형태로 침전시켜 처리하는데 있어 pH, 레미콘슬러지 주입량, Seed물질 주입량, 교반속도, 교반시간의 최적 조건을 도출하고자 하는데 있다. 실험결과 레미콘 슬러지를 이용한 대상폐수의 CaF₂ 침전 반응에서 함수율 및 불소의 제거효율 등을 고려할 경우 최적의 pH 6, 레미콘 슬러지 주입량은 10 g/L, Seed 물질 주입량은 2 g/L, 교반속도은 100 rpm, 교반시간은 60 min으로 관찰되었다. 이 때 Seed 물질의 주입은 불소제거효율에는 영향이 없는 것으로 나타났지만 침전물의 형성이 되는 반응을 촉진시키고 플럭형성을 원활하게 하여 고액 분리가 잘 되어 함수율이 낮아지는 결과가 나타났다. The purpose of this study was performed to investigate the optimum conditions of pH, concrete sludge, seed dosage, mixing intensity, operation time in treating fluoride-containing wastewater as CaF₂ using the ready-mixed concrete sludge. Considering fluoride removal, water content, that pH 6, concrete sludge dosage of 10 g/L, Seed dosage (CaF₂) of 2 g/L, mixing intensity of 100 rpm and operation time of 60 min were found to be optimum. Correspondingly, removal of fluoride and water content was about 85% and 64%, respectively. Increase in amount of seed dosage did not affect fluoride removal efficiency. but the result that the water content is decreased was shown up in occuring the solid-liquid separation well.

INT-dehydrogenase 및 OUR 시험법의 평가: 기질 종류와 시험 미생물 종에 따른 영향

추연덕 ( Yeon Duk Choo ),신관우 ( Gwan Woo Shin ),김금용 ( Keum Yong Kim ),류홍덕 ( Hong Duck Ryu ),이상일 ( Sang Ill Lee ) 한국수처리학회 2011 한국수처리학회지 Vol.19 No.2

This study was aimed to evaluate the INT-DHA and OUR tests in which the effects of substrate types and microorganism species were investigated. In OUR test, the activity of activated sludge was more affected than in INT-DHA test when organic matters were used as substrates. In addition, the substrate types affects on the activity of activated sludge in their tests. In the utilization of ammonia as a substrate, the INT-DHA test was not fit to asses the activity of activated sludge and nitrifiers, whereas the OUR test was available for assessment of nitrifier`s activity in the specific ammonia concentration range. For the INT-DHA test, it was revealed that the utilization of mixed substrates, in which organic carbon and ammonia was mixed, was not desirable to determine the activity of activated sludge and nitrifiers, whereas it can be recommended in the OUR test.

Candle Filter를 이용한 반도체 폐수의 Si 입자 제거 시 Media의 Precoating 조건

강민구 ( Min Koo Kang ),신관우 ( Gwan Woo Shin ),이한슬 ( Han Seul Lee ),강한솔 ( Han Sol Kang ),이상일 ( Sang Ill Lee ) 한국수처리학회 2014 한국수처리학회지 Vol.22 No.4

In this study, it used the candle filter in order to remove the Si particle of CMP wastewater which is generally produced from semiconductor industry. The chemical mechanical polishing (CMP) wastewater is the super pure water as the water come out of the semiconductor process with including the partial silica particle and occupies 40% of the effluent generated in the process of manufacturing semiconductor. If this process is formed in the media surface after the predetermined time flows, the quality of water of the treated water is improved. By using this concept, the treatment was possible which is the partial silica in the shortest possible time. The pre-coating used the CMP and Back grind wastewater and it measured and compared the Si particle removal ratio with the flow rate and turbidity. The time to use Back grind was the pore size blocked within the time to be faster than the CMP wastewater and the flow rate of the effluent which is treated was fast. So Back grind wastewater is suitable Pre-coating process. The Pre-coating process was finished and the CMP wastewater was filtered later. There was no difference from two media and the silica concentration of the effluent flowed out investigated the removal ratio exceeded 90% altogether.

플라즈마 산화에서 pH 및 첨가제에 따른 페놀의 처리효율 비교

최승규 ( Seung-kyu Choi ),신관우 ( Gwan-woo Shin ),주천 ( Zhu-qian ),김진수 ( Jin-su Kim ),이상일 ( Sang-ill Lee ) 한국수처리학회(구 한국수처리기술연구회) 2019 한국수처리학회지 Vol.27 No.3

In this study, the treatment rate of phenol was compared by initial pH, magnesium source and activated carbon using underwater plasma process. When the initial pH were 4, 7, 10 and 12.5, phenol removal efficiency was the highest at pH 12.5. The larger amount of OH- used in the reaction, the formation of OH radical is better. Therefore, the phenol removal rate would have increased at high pH. MgO, MgSO₄, Mg(OH)₂ were used as a magnesium sources and initial pH was 10. The removal efficiency of MgO and Mg(OH)₂ was higher than that of MgSO₄ and control. The magnesium ion itself has no effect on removal efficiency. It is considered that oxygen and OHattached to MgO and Mg(OH)₂ contributed to the increase of removal efficiency. The removal efficiency increased with the addition of GAC to the plasma process. Unlike the magnesium injecting, COD removal efficiency rate increased. It is considered that the activated carbon adsorbs phenol itself without decomposition into intermediates. injection of the additional materials to the plasma oxidation can increase the efficiency and overcome the limitations of the operating conditions.

Modified Dephanox 공정에서 혐기성 접촉조의 생물흡착(Biosorption) 시간에 따른 영양염류 제거

강민구 ( Min Koo Kang ),신관우 ( Gwan Woo Shin ),김긍용 ( Keum Yong Kim ),이상일 ( Snag Ill Lee ) 한국수처리학회 2010 한국수처리학회지 Vol.18 No.4