마이크로버블 장치를 이용한 철강산업의 산회수설비 발생 염화수소 가스 처리

정재억,이광헌,정용준 한국습지학회 2023 한국습지학회지 Vol.25 No.4

철강산업의 산 회수설비에서 발생하는 염화수소 가스를 처리하기 위하여 마이크로버블을 발생할 수 있는 습식스크러빙 장치(DIWS)가 도입되었다. 산 회수 설비에서 발생하는 염소가스는 수소 가스와 결합하여 염화수소 가스의 농도를50% 정도 증가시켰다. DIWS장치에 염소 제거를 위한 Na2S2O3를 투입한 이후의 유입수 염화수소 가스 농도는 13.1 ∼13.4 ppm, 유출수는 1.5∼1.7 ppm이었고, 제거율은 87.5∼88.8%로 안정되게 유지하였다. DIWS는 대기배출기준을 안정적으로 만족함에 따라 현장 적용에 적용할 수 있는 공정으로 판단된다. DIWS system was employed to treat hydrochloric acid gas from cold rolling mill process of iron and steel industry. Chlorine gas generated from the acid regeneration system was combined with hydrogen gas and hydrogen chloride gas was increased to 50%. After the injection of Na2S2O3 to remove chlorine gas, the removal of hydrogen chloride was stably kept 87.5∼88.8%, where the inflow was 13.1∼13.4ppm and the outflow was 1.5∼1.7ppm. DIWS system can be recommended for the real iron and steel plant because it was stably maintained not only the air emission standards but also the reduction of chemical usage.

저에너지 마이크로버블 장치를 이용한 고농도 암모니아 공장 폐수 처리

정재억,정용준 한국습지학회 2016 한국습지학회지 Vol.18 No.3

고농도의 암모니아 함유 공장 폐수를 대상으로 마이크로버블이 발생되는 장치를 이용하여 암모니아 탈기에 의한 처리 가능성을 평가하였다. 기존 처리장은 pH를 12.5로 유지하면서 반응 조내의 온도를 30℃에서 70℃로 상승시켜 72시간 동안 고온 탈기 시켰을 경우 T-N의 제거효율은 70.3%에서 90.5%로 증가하였다. 온도를 30℃로 유지하면서 유입수 의 T-N 농도가 9,120∼12,955 mg/L인 폐수를 20시간 동안 마이크로버블에 의한 지속적인 접촉으로 상온 탈기 시킨 결과 T-N 제거율을 90.5∼91.9%로 확보하였으며, 운전기간 동안의 pH는 12.3에서 10.1로 소폭 감소하였다. This study was carried out to evaluate the feasibility of air-stripping by DIWS(Dip Injection Wet Scrubber) system on high concentration of ammonia wastewater more than 10,000 mg/L. In the case of changing temperature from 30℃ to 70℃ maintaining pH 12.5 within the 72 hours, the removal efficiency of T-N by the present treatment plant was increased to 90.5% which was initially kept 70.3%. Although the high concentration of T-N with 9,120∼12,955 mg/L was treated by micro-bubble through DIWS system maintaining the temperature of 30℃ within the 20 hours, the removal efficiency of T-N reached 91.9%, which indicated the possibility of air-stripping.

마이크로버블 장치를 이용한 하수처리장 바이오가스의 황화수소 제거

정재억,정용준 한국습지학회 2020 한국습지학회지 Vol.22 No.4

Prior to utilization of energy and power generation, the biogas from anaerobic digestion of sewage treatment plant(46,000m2/d) should be purified particularly hydrogen sulfide among the various kinds of impurities. This study has focused on the methane decreasing rate and the removal of both hydrogen sulfide and carbon dioxide. In the case of partial circulation, 59.7% of methane gas was decreased to 57.4% in spite of oxidation process with micro-bubble. Carbon dioxide was removed from 38% to 32% and 76.1% of hydrogen sulfide was removed where 1,400ppm was introduced to the DIWS system, which indicated that DIWS system can be of use for the hydrogen sulfide removal of biogas from sewage treatment plant. 혐기성소화조에서 발생하는 바이오가스는 열과 전력을 생산하는데 사용되기 전에 불순물, 특히 황화물 제거 공정이 수반되어야 한다. 본 연구에서는 시설용량 46,000m2/d의 하수처리장을 대상으로 습식스크러빙 장치를 활용하여 운전 조건의변화에 따른 메탄감소율과 황화수소 및 이산화탄소의 제거율을 평가하였다. 부분순환에서 장치 유입전 평균 59.7%의CH4은 처리후 57.4%로 감소하여 3.9%의 감소율을 나타내어 마이크로버블 산화에도 불구하고 천천히 기화되는 것을 알수 있었다. CO2의 경우 38%가 장치로 유입되어 32%로 배출됨에 따라 15.8%의 제거율을 나타냈다. 1,400ppm의 H2S는DIWS장치로 유입되어 334ppm으로 배출되어 76.1%의 감소율을 나타냈다.

마이크로버블 장치를 이용한 제지공정 소성로 배기 오염물질 처리

정재억,정용준 한국환경과학회 2020 한국환경과학회지 Vol.29 No.11

This work was performed to develop a dip injection wet scrubber (DIWS) system with chlorine dioxide as the oxidant. The exhaust pollutants from a lime kiln of paper-mill were introduced to the system. When NaClO3 was used to oxidize NO into NO2, the oxidation was unsatisfactory and the combination of HNO3 or H2SO4 was required for 100% oxidation. ClO2 is recommended to oxidize NO and SO2 effectively. With the combination of 1st stage of DIWS and ClO2, 57.1% of NOx and 98% of SO2 were effectively removed. In the case of 2nd stage of DIWS and ClO2, 93.5% of NOx and 99% of SO2 were removed. The ClO2+DIWS process was superior to the ClO2+Scrubber process in terms of investment, running cost and NOx removal efficiency.

중화약품과 마이크로버블 장치를 이용한 폐수처리장 바이오가스 처리

정재억(Jae-Ouk Jung),정용준(Yong-Jun Jung) 한국습지학회 2021 한국습지학회지 Vol.23 No.1

폐수처리장에서 발생하는 바이오가스 중의 황화수소를 처리하기 위하여 습식스크러빙 장치가 적용되었다. 유입 H₂S 의 농도가 5,000mg/L이상에서 DIWS 장치에 물만을 사용할 경우 25%의 제거율을 나타내어 후속으로 소각처리 공정이 도입되어야만 98% 이상의 제거율을 나타냈다. 유입 H2S의 농도가 5,000mg/L일 때 CH₄과 CO₂는 각각 8.7%와28.6% 감소하여 배출되었다. DIWS 장치에 중화약품으로 Na₂CO₃와 NaOH를 사용하였을 때 pH가 11.2∼11.5를유지하면서 H₂S는 97.2% 제거되었다. DIWS system was introduced to remove hydrogen sulfide from the biogas of wastewater treatment plant. In the case of using water into the DIWS system more than 5,000mg/L of hydrogen sulfide, 25% of H₂S removal efficiency was shown and required such further treatment process as incineration which was obtained more than 98%. When the inflow of hydrogen sulfide was 5,000mg/L, CH₄ and CO₂ were effectively discharged and the reduction was 8.7% and 28.6%, respectively. When such neutralization chemicals as Na₂CO₃ and NaOH were introduced into the DIWS system, H₂S was removed more than 97.2% keeping pH in the range of 11.2 to 11.5.

마이크로버블 발생 장치를 이용한 암모니아 탈기

정재억 ( Jaeouk Jung ),임재환 ( Jaehwan Lim ),김예진 ( Yejin Kim ),정용준 ( Yongjun Jung ) 한국물환경학회(구 한국수질보전학회) 2016 한국물환경학회·대한상하수도학회 공동 춘계학술발표회 Vol.2016 No.-

침액식 세정설비의 마이크로버블을 이용한 철강산업 공정의 산세조 발생 염화수소 제거

김예진,정재억,정용준 한국습지학회 2015 한국습지학회지 Vol.17 No.1

대기오염물질인 염화수소의 배출 규제가 2ppm으로 강화됨에 따라 기존의 제철공장 습식세정 장치에 DIWS 시스템이도입되었다. 침액식 스크러버 시스템으로 제철공정에서 발생되는 염화수소를 처리하기 위한 파일럿 연구를 수행하였다. DIWS 시스템의 운전에 따른 응축수 pH는 연돌에서 6.0으로 증가하였다. 산세 Fume 정제설비의 평균 유입 염화수소는 13.3ppm, 평균 배출가스는 0.43ppm, 평균 제거율은 96.9%로 나타났다. TMS 장치로 장기간 측정한 데이터를비교하였을 때 DIWS 장치는 안정적인 제거율을 나타냈지만, TMS의 type별 데이터 불균일 현상이 관찰되었다. DIWS system was introduced to treat HCl gas from the scrubber of iron and steel industry according as the regulationof air quality is expected to be changed to 2ppm. pH of condensed water at stack was increased to 6.0. While13.3ppm of inflow HCl was introduced to DIWS system, the average exhaust gas was 0.43ppm with 96.9% ofremoval efficiency. Compared with HCl data of TMS, the stable removal efficiency was shown in DIWS system, butthe phenomenon of data hunting was also observed with different types of TMS apparatus.

오존처리공정의 배오존 재활용 마이크로버블시스템 개발

조영만,정재억,이광헌,정용준 한국환경과학회 2022 한국환경과학회지 Vol.31 No.12

The purpose of this study was to develop a recycling system for ozone off-gas. Although the ozone transmission rate of the injector method differs slightly depending on the ozone injection rate, it reaches approximately 99%, which is very high. During the increase in water inflow to the ozone recycling system from 2 L/min to 10 L/min, the average ozone recycling rate was 99.4% at a 1 ppm ozone injection rate, 98.6% at a 2 ppm ozone injection rate, 98.1% at a 3 ppm ozone injection rate. Ozone treatment facility operating costs can be divided into the costs of pure oxygen production, ozone production, and maintenance. The annual operating costs of ozone treatment facilities in Korea are estimated to be approximately 38.9 billion won. The annual savings are estimated to be approximately 5.8 billion won when the ozone transfer rate of the diffuser method, which is mostly employed in domestic water treatment plants, is 85% and 15% of the ozone is recycled.

마이크로버블을 이용한 냉연 산회수설비공정 발생 염화수소 가스 처리

정용준,정재억,김예진 한국습지학회 2015 한국습지학회지 Vol.17 No.2

제강산업의 냉연 산회수 설비공정을 검토하였고, 공정에서 발생되는 염화수소 가스를 처리하기 위하여 마이크로버블이 발생되는 DIWS 시스템을 운전하였다. 염화수소 가스의 대기배출허용기준을 만족하기 위해서는 추가공정의 도입이 필 요한 것으로 나타났다. DIWS 장치로 유입되는 평균 염화수소 가스의 농도는 22.3 ppm, 배출가스의 농도는 0.59 ppm 으로 평균 제거율은 97.3%였다. TMS 장치에 의한 10시간 5분 간격 측정에서도 평균 0.69 ppm으로 안정적이었으며, 수동으로 측정하여 TMS 장치의 신뢰도를 검증하였다. This work has performed to examine the operation status of regeneration and scrubber system of cold rolling mill plant and established the DIWS(Dip Injection Wet Scrubber) system for the removal of hydrochloric acid with micro bubble. When the initial 22.3 ppm of HCl gas was injected into the system, the average exhaust HCl gas was 0.59 ppm with the removal efficiency of 97.3%. Hydrochloric acid was effectively removed by DIWS system. In the long term monitoring for 10 hours by 5 minutes through TMS(Tele Monitoring System), the average exhaust HCl gas was stably kept 0.69 ppm, which was also verified by manual measurement.

마이크로버블과 자외선/과산화수소 산화공정을 이용한 광산배수의 중금속 처리 특성

정용준 ( Yong-jun Jung ),정재억 ( Jae-ouk Jung ) 한국환경과학회 2017 한국환경과학회지 Vol.26 No.3

Aeration with low energy micro-bubble generation and UV/H₂O₂ processes was introduced to verify the possibility of oxidation treatment for acid mine drainage. During 10 hours of aeration with micro-bubbles, Fe and As concentrations were decreased to 18.1 and 61.8%, respectively, while Cu, Cd, Al were kept at influent concentrations. Other heavy metals such as Mn, Cr, Pb, Zn, and Ni concentrations fluctuated due to the repetition of oxidation and release. Twenty days of aeration indicated the oxidation possibility for Cu, Cd, and Al. With the employment of UV/H₂O₂ processes, more than 77% of Cu and Fe removed, whereas slightly more than 30% of Cd and Al removed.