경상북도내 주요 하폐수처리장 방류수의 미량유해물질 배출특성

서상욱 ( Sang Wook Seo ),배헌균 ( Hun Kyun Bae ) 한국환경과학회 2011 한국환경과학회지 Vol.20 No.6

Water samples from several wastewater treatment plants and two industry drains in Gyeongsangbukdo were investigated for concentration levels of micropollutants. Samples were taken totally four times from May to November of 2008 and tested for seven factors including pesticide, 1,4-Dioxane and Perchlorate which had been big issues for Nakdong river because of their contaminations. As results, 2,4-D, Alachlor, and BEHA were not detected while BEHP was detected at some sampling sites. 1,4-Dioxane and Perchlorate were also detected in wide ranges from several sampling sites. Therefore, continuous supervising and monitoring systems needed to be invested for proper management for micropollutants since those micropollutants could affect human health and aquatic system with low concentration levels.

실 규모 물 처리 공정 및 후속 흡착 처리에 의한 오염원 제거 잠재성 평가

변해일,여건희,응우옌 홍안,김영웅,김동건,이태훈,정설화,최영화,오승대 한국토지주택공사 토지주택연구원 2024 LHI journal of land, housing, and urban affairs Vol.15 No.1

본 연구에서는 하이드로사이클론, 응결/응집, 용존공기부상 단일 공정이 결합한 실 규모 물순환 조합공정(HCFD)의 오염 지표수 처리 성능을 평가하였다. 실 규모 물순환 공정은 수질 변동이 큰 유입 원수를 대상으로 안정적인 수처리 효율을 보였으며, 유입수의 주요 수질 지표가 매우 나쁨(BOD, TP, COD) 혹은 약간 나쁨(SS)이었으나, 방류수는 매우 좋음(BOD, SS, TP) 혹은 좋음(COD) 수준으로 향상되었다. 물순환 시스템 방류수의 후속 고도 처리를 위해 활성탄 기반 흡착 공정의 용존성 유기물 및 미량오염물질(잔류의약물질 APAP 및 산업 화학물질 AO7) 처리 잠재성을 평가하였다. 오염원 흡착 특성은 흡착동역학 및 등온 흡착실험과 관련된 모델링 기법을 이용하여 관찰하였다. 실험 결과, 후처리 활성탄 흡착은 잔류 유기물, APAP, AO7 유기물에 대한 높은 오염원 제거 잠재성이 있음이 확인되었으며, 오염원 흡착속도 및 최대 흡착량 값은 유사 2차 반응속도 모델과 Langmuir 등온흡착 모델에 의해 결정되었다. 본 연구 결과, 활성탄 기반 흡착 공정은 기존의 물순환 조합공정과 연계시 수처리 효율을 상호 보완적으로 높이고, 흡착 공정은 전단의 입자 분리 공정으로 제거가 어려운 용존성 오염원의 후속 처리에 대한 높은 잠재성이 있음을 시사한다. This study aimed to assess the efficacy of an adsorption process in removing organic matter and micropollutant residuals. After a full-scale water circulation system, the adsorption process was considered a post-treatment step. The system, treating anthropogenically impacted surface waters, comprises a hydro-cyclone, coagulation, flocculation and dissolved air flotation unit. While the system generally maintained stable and satisfactory effluent quality standards over months, it did not meet the highest standard for organic matter (as determined by chemical oxygen demands). Adsorption experiments utilized two granular activated carbon types, GAC 830 and GCN 830, derived from coal and coconut-shell feedstocks, respectively. The assessment encompassed organic materials along with two notable micropollutants: acetaminophen (APAP) and acid orange 7 (AO7). Adsorption kinetics and isotherm experiments were conducted to determine adsorption rates and maximum adsorption amounts. The quantitative findings derived from pseudo-second-order kinetics and Langmuir isotherm models suggest the effectiveness of the adsorption process. The findings of this study propose the potential of employing the adsorption process as a post-treatment to enhance the treatment of contaminants that are not satisfactorily treated by conventional water circulation systems. This enhancement is crucial for ensuring the sustainability of urban water cycles.

강둑여과수를 이용한 정수처리 공정별 수질의 변이원성 평가

이순화,박영규,이철희 嶺南大學校 環境問題硏究所 1999 環境硏究 Vol.18 No.2

ABSTRACT Much of the public health concern about this topic originated after the detection of carcinogenic and/or mutagenic compounds in surface water including drinking waters. Such presence of mutagenic substances in river water brings about the possibility of causing hazardous effects on not only aquatic organisms but also human health itself. To secure the safety of drinking water, it should be necessary to monitor these micropollutants. Mutagenicity Test, in this bioassay, should produce at least twice the number of revertants as concurrent negative controls and provide a clear dose-response relationship. In this result, Nakdong River was polluted by the frame-shift mutagenic and hydrophilc compounds. To improve its quality, surface water may be treated in different ways. Several processes, such as bank filtration, coagulation, ozonation and activated carbon adsorption can be used to remove natural and sythetic organic compounds.

Prediction of micropollutant elimination during ozonation of a hospital wastewater effluent

Lee, Y.,Kovalova, L.,McArdell, C.S.,von Gunten, U. Pergamon Press 2014 Water research Vol.64 No.-

Determining optimal ozone doses for organic micropollutant elimination during wastewater ozonation is challenged by the presence of a large number of structurally diverse micropollutants for varying wastewater matrice compositions. A chemical kinetics approach based on ozone and hydroxyl radical (?OH) rate constant and measurements of ozone and ?OH exposures is proposed to predict the micropollutant elimination efficiency. To further test and validate the chemical kinetics approach, the elimination efficiency of 25 micropollutants present in a hospital wastewater effluent from a pilot-scale membrane bioreactor (MBR) were determined at pH 7.0 and 8.5 in bench-scale experiments with ozone alone and ozone combined with H<SUB>2</SUB>O<SUB>2</SUB> as a function of DOC-normalized specific ozone doses (gO<SUB>3</SUB>/gDOC). Furthermore, ozone and ?OH exposures, ?OH yields, and ?OH consumption rates were determined. Consistent eliminations as a function of gO<SUB>3</SUB>/gDOC were observed for micropollutants with similar ozone and ?OH rate constants. They could be classified into five groups having characteristic elimination patterns. By increasing the pH from 7.0 to 8.5, the elimination levels increased for the amine-containing micropollutants due to the increased apparent second-order ozone rate constants while decreased for most micropollutants due to the diminished ozone or ?OH exposures. Increased ?OH quenching by effluent organic matter and carbonate with increasing pH was responsible for the lower ?OH exposures. Upon H<SUB>2</SUB>O<SUB>2</SUB> addition, the elimination levels of the micropollutants slightly increased at pH 7 (<8%) while decreased considerably at pH 8.5 (up to 31%). The elimination efficiencies of the selected micropollutants could be predicted based on their ozone and ?OH rate constants (predicted or taken from literature) and the determined ozone and ?OH exposures. Reasonable agreements between the measured and predicted elimination levels were found, demonstrating that the proposed chemical kinetics method can be used for a generalized prediction of micropollutant elimination during wastewater ozonation. Out of 67 analyzed micropollutants, 56 were present in the tested hospital wastewater effluent. Two-thirds of the present micropollutants were found to be ozone-reactive and efficiently eliminated at low ozone doses (e.g., >80% for gO<SUB>3</SUB>/gDOC = 0.5).

Removal of sulfamethoxazole, ibuprofen and nitrobenzene by UV and UV/chlorine processes: A comparative evaluation of 275 nm LED-UV and 254 nm LP-UV

Kwon, Minhwan,Yoon, Yeojoon,Kim, Seonbaek,Jung, Youmi,Hwang, Tae-Mun,Kang, Joon-Wun Elsevier 2018 Science of the Total Environment Vol.637 No.-

<P><B>Abstract</B></P> <P>The aim of this study is to evaluate the micropollutant removal capacity of a 275 nm light-emitting diode (LED)-UV/chlorine system. The sulfamethoxazole, ibuprofen, and nitrobenzene removal efficiencies of this system were compared with those of a conventional 254 nm low-pressure (LP)-UV system as a function of the UV dose. In a direct photolysis system, the photon reactivity of sulfamethoxazole is higher than that of nitrobenzene and ibuprofen at both wavelengths. The molar absorption coefficients and quantum yields of each micropollutant were as follows: sulfamethoxazole (<I>ε</I> <SUB> <I>SMX</I>, 275 <I>nm</I> </SUB> <SUP> <I>protonated</I> </SUP> = 17,527 M<SUP>−1</SUP> cm<SUP>−1</SUP>, Φ<SUB> <I>SMX</I>, 275 <I>nm</I> </SUB> <SUP> <I>protonated</I> </SUP> = 0.239, <I>ε</I> <SUB> <I>SMX</I>, 275 <I>nm</I> </SUB> <SUP> <I>deprotonated</I> </SUP> = 8430 M<SUP>−1</SUP> cm<SUP>−1</SUP>, and Φ<SUB> <I>SMX</I>, 275 <I>nm</I> </SUB> <SUP> <I>deprotonated</I> </SUP> = 0.026), nitrobenzene (<I>ε</I> <SUB> <I>NB</I>, 275 <I>nm</I> </SUB> = 7176 M<SUP>−1</SUP> cm<SUP>−1</SUP> and Φ<SUB> <I>NB</I>, 275 <I>nm</I> </SUB> = 0.057), and ibuprofen (<I>ε</I> <SUB> <I>NB</I>, 275 <I>nm</I> </SUB> = 200 M<SUP>−1</SUP> cm<SUP>−1</SUP> and Φ<SUB> <I>IBF</I>, 275 <I>nm</I> </SUB> = 0.067). The photon reactivity of chlorine species, i.e., HOCl and OCl-, were determined at 275 nm (<I>ε</I> <SUB> <I>HOCl</I>, 275 <I>nm</I> </SUB> = 28 M<SUP>−1</SUP> cm<SUP>−1</SUP>, Φ<SUB> <I>HOCl</I>, 275 <I>nm</I> </SUB> = 1.97, <I>ε</I> <SUB> <I>OCl</I>−, 275 <I>nm</I> </SUB> = 245 M<SUP>−1</SUP> cm<SUP>−1</SUP>, and Φ<SUB> <I>OCl</I>−, 275 <I>nm</I> </SUB> = 0.8), which indicate that the decomposition rate of OCl<SUP>−</SUP> is higher and that of HOCl is lower by 275 nm photolysis than that by 254 nm photolysis (<I>ε</I> <SUB> <I>HOCl</I>, 254 <I>nm</I> </SUB> = 60 M<SUP>−1</SUP> cm<SUP>−1</SUP>, Φ<SUB> <I>HOCl</I>, 254 <I>nm</I> </SUB> = 1.46, <I>ε</I> <SUB> <I>OCl</I>−, 254 <I>nm</I> </SUB> = 58 M<SUP>−1</SUP> cm<SUP>−1</SUP>, and Φ<SUB> <I>OCl</I>−, 254 <I>nm</I> </SUB> = 1.11). In the UV/chlorine system, the removal rates of ibuprofen and nitrobenzene were increased by the formation of OH and reactive chlorine species. The 275-nm LED-UV/chlorine system has higher radical yields at pH 7 and 8 than the 254 nm LP-UV/chlorine system.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Micropollutants could be oxidized by 275 nm LED-UV alone and -UV/chlorine systems </LI> <LI> Direct photolysis reactivity of selected micropollutants were determined at 275 nm </LI> <LI> Radical yields from chlorine photolysis depend on the wavelength, pH, and Cl<SUB>2</SUB> dose </LI> <LI> 275 nm UV/chlorine system has higher removal efficiencies at pH 7 and 8 than 254 nm </LI> <LI> Higher photo-reactivity of OCl<SUP>−</SUP> at 275 nm than at 254 nm gives higher radical yields </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

A novel method for micropollutant quantification using deep learning and multi-objective optimization

조경화 환경독성보건학회 2022 한국독성학회 심포지움 및 학술발표회 Vol.2022 No.10

Pesticides 및 Micropollutant 인한 남조류 성장 비교

박나리(Naree Park),김덕원(Deokwon kim),최영훈(Younghoon Choi),Sardar syed wasim,김경현(Kyunghyun Kim),문현생(Hyunsaing Mun),이소영(Soyoung Lee),박상현(Sanghyun Park),전준호(Junho Jeon) 환경독성보건학회 2017 한국독성학회 심포지움 및 학술발표회 Vol.2017 No.5

중압 자외선과 과산화수소 공정을 이용한 하수 3차 처리수중 총유기탄소와 미량오염물질 제거

이재엽 ( Lee Jai-yeop ),김일호 ( Kim Ilho ) 한국물환경학회 2020 한국물환경학회지 Vol.36 No.4

This study evaluated the applicability of UV-AOP process using medium-pressure UV lamp and H2O2 to remove TOC and emerging micropollutants in the effluent from a sewage treatment plant. The UV lamp with higher output(1.6∼8.0 kW) showed slightly higher amount of power in removing TOC of 1 mg/L(0.09 kWh/mg/L∼0.11 kWh/mg/L), however it was found that there was no significant difference for each cases. In addition, under the condition that the H₂O₂ concentration is sufficient, as the power consumption of the UV lamp increases, the unit TOC removal concentration per unit H₂O₂ decomposition concentration also increases, resulting in effective removal of TOC. The removal rate of 7 new trace contaminants, such as antibiotics by the UV-AOP tested, was at least 89.4%, and the ability to remove the emerging micro pollutants in the process was very effective. But, it was judged that it could not be excluded that the probablity of transforming to oxidated by-product in the case of a low TOC removal efficiency. Depending on the operating conditions of the UV and H₂O₂ processes, a higher BOD concentration is found in the treated water than in the influent, and it is necessary to review the UV power and proper injection conditions of H₂O₂ to maintain the BOD concentration increase below a certain level.

미량오염물질 특성이 용존유기물로 인한 활성탄 흡착능 저해에 미치는 영향

정지원 ( Jeong Jiwon ),김근영 ( Kim Geunyoung ),구원준 ( Koo Wonjun ),최용주 ( Choi Yongju ) 한국물환경학회 2023 공동춘계 학술발표회 논문집 Vol.2023 No.0

아닐린 유래 금속 복합소재(MeNC)를 이용한 촉매 오존 공정의 미량오염물질 제거: 공정 효율 및 기작 이해

최의영 ( Choi Euiyoung ),오훈 ( Oh Hoon ),김현진 ( Kim Hyunjin ),이웅배 ( Lee Woongbae ),이창하 ( Lee Changha ),이재상 ( Lee Jaesang ),이윤호 ( Lee Yunho ) 한국물환경학회 2024 한국물환경학회·대한상하수도학회 공동 춘계학술발표회 Vol.2024 No.-