기존 처리공정의 변형을 통한 분뇨 및 정화조 폐액의 질소, 인 제거

어성욱 우송대학교 1999 우송대학교 논문집 Vol.4 No.-

An existing 2 stage aerobic nightsoil treatment plant(25kL/d capacity)has modified into a single stage SBR unit for nutrient removal based on the previous laboratory study. The existing plant facilitated 1st stage aeration with 19.2 d HRT and 2nd stage aeration with 11.2 d HRT. The plant influent consisted of 40% septage represents pH 7.9, 41g/L TCCOD, 15.2g/L TBOD, 26.8 g/L TSS, 4.4 g/L TKN 0.69 g/L TP and 19.8 g/L alkalinity. The modified SBR unit with 30.5 d HRT operated with a daily cycle of 3.9 to 5.9 hr anaerobic, 12 to 16 hr aerobic, 3.9 to 5.9 hr anoxic and 0.2 hr for fill and draw. 12 months study indicated organic and nutrient removal drastically improved after modification. Effluent qualities after modification were 1,339 mg/L from 4,152 mg/L in SCOD, 78 mg/L from 649 mg/L in SBOD, 20 from 790 mg/L in NH4-N, 0 from 28 mg/L in NO2-N, 23 from 10 mg/L in NO3-N and 85 mg/L from 450 mg/L in PO4-P. Heat released from decomposition of high strenght influent kept liquid temperature above 15 ℃ for a complete nitrification even during winter period. Contaminated influent with insecticide stopped nitrification and reduced organic removal efficiencies, but did not affect phosphorus removal efficiency. Piping changes and timer installation were the major capital investments in this modification, but energy savings were estimated to be about 40 to 53 %. Additional savings in O&M could be expected from the improved effluent quality.

단일정 주입 추출법을 이용한 질산성질소오염 지하수의 현장 생물복원을 위한 탈질율 결정

어성욱,김영,김건하 한국폐기물자원순환학회 2005 한국폐기물자원순환학회지 Vol.22 No.7

인공 저류지를 이용한 축산 지역 비점오염물질 유출 저감 효율 분석

어성욱 한국습지학회 2018 한국습지학회지 Vol.20 No.4

It analyzed the efficiency of the runoff reduction of artificial reservoir by analyzing the influent and effluent of reservoir located downstream of the livestock area. Production of non point pollutants in livestock feeding areas, which is located at steep slope land, was mainly due to first flushes. Suspended Solid concentration of influent increased due to amount of rainfall, and T-P also increased over four times and 30 % of total nitrogen increased on average compared to those of dry season. While the concentration of nitrate nitrogen showed little variation, ammonia nitrogen increased over two times. The storage style nonpoint reduction facility showed the highest removal efficiency of 53 % for total phosphorus in dry weather, when the removal efficiency was 37 % for suspended solids, 10% for organic compounds, and 5 % for total nitrogen. Since algal bloom grows due to eutrophication in summer, the minus removal efficiencies of nitrogen concentration through the reservoir occurred with high frequency. Removal efficiency decreased during rainfall, showing 60 % for supended solids, and 22 % for total phosphorus. While having over nine times of capacity than the standard of non-point removal facility from Ministry of Environment, it was impounded with water during rainy season, showing not enough nonpoint removal efficiency, which indicates that maintenance is also an important factor to the nonpoint removal efficiency. 축산 지역 하류에 위치한 농업용 저수지의 강우시 유입, 유출수 분석을 통해 축산지역의 강우 유출 특성과 저류지에의한 축산계 비점 오염물질의 저류형 시설에 의한 유출 저감 효율을 분석하였다. 급경사지에 위치한 한우 축산 지역의비점 오염물질 유출은 주로 초기세척현상에 의해 발생됨을 알 수 있었으며 강우시의 유입수 농도는 비강우시에 비해SS농도가 가장 높게 발생하고 있으며 T-P도 4배 이상 증가하는 양상을 보인다. 반면 총질소는 평균 30% 증가하는 것으로나타나는데 질소항목으로 보면 질산성 질소는 거의 변화가 없는 반면에 암모니아성 질소가 2배 이상 증가하고 있다. 저류형 비점 제거시설 효율 분석 결과 비강우시 총인 제거효율이 53%로 가장 높고 부유물질은 37% 제거되고 있다. 유기물질은 10% 내외, 총질소는 5% 이내로 제거되며 부영양화로 녹조가 번성하는 하절기에는 오히려 유출수의 질소농도가 더 높아지는 경우도 빈번히 발생하고 있다. 강우시의 유입수 농도는 비강우시에 비해 SS농도가 가장 높게 발생하고있으며 T-P도 4배 이상 증가하는 양상을 보인다. 강우시 부유물질의 제거효율은 60%로 나타나고 있으며 총인은 22% 제거되어 비강우시에 비해 제거효율은 감소하고 있다. 환경부의 비점제거시설 기준보다 9배 이상의 용량을 지니고 있지만비점 전용 시설로 활용되지 못하는 탓에 장마철에 거의 만수 상태로 담수하여 비점제거 효율에 있어서는 충분한 효과를보이지 못하고 있는 것으로 나타나 저수지의 용량 뿐 아니라 수문관리 등 유지관리도 비점 제거효율에 영향을 미치는중요 인자로 분석되었다.

양돈 퇴, 액비 내 중금속 및 항생제의 토양 흡착특성 연구

어성욱 한국습지학회 2012 한국습지학회지 Vol.14 No.3

양돈 농가에서 구리, 아연 등의 성장촉진제와 항생제들이 사료 첨가제로 사용되는데 사료에 주입된 많은 양이 분뇨로 배설되고 있다. 국내 양돈 폐수의 90% 이상이 퇴, 액비 형태로 농지에 적용되고 있는 상황에서 퇴, 액비 내에 함유된 중금속과 항생물질은 토양에 흡착되어 농지에 잔류하거나 지하수나 지표수로 유출되어 수계로 빠져나간다. 농지에 살포된 중금속과 항생물질의 토양 내에서의 거동을 살펴보기 위해 실험실 기초 실험을 수행 하였는데, Jar test와 칼럼 용출 실험을 수행하였다. 실험결과 아연의 86.4와 구리의 68%가 토양에 흡착되는 것 으로 나타난 반면, 액비에 포함된 항생물질의 60% 이상은 칼럼 유출수로 용출되는 것으로 나타났다.

폐기물 매립장 침출수 내의 난분해성 물질 제거를 위한 미생물의 cometabolism 반응성 연구

어성욱 우송대학교 2003 우송대학교 논문집 Vol.8 No.-

For the treatment of non biodegradable COD of landfill leachate, there seemed to be no available biological processes. Aliphatic and aromatic hydrocarbon are revealed as main compounds of NBDCODs. Recent field and laboratory studies have evaluated the potential for aerobic co-metabolism of chlorinated solvents. Different co-metabolic substrates and different methods of application have been tried, including growing indigenous microbes in situ, and injecting into the soil subsurface stains grown in subsurface reactors for their co-metabolic potential. There is much potential for using co-metabolism for treating a broad range of chlorinated aliphatic hydrocarbons. Recirculation wells have potential for adding soluble co-metabolic substrates(i.e. phenol and toluene) into contaminated aquifers, while direct addition of gaseous substrates (i.e. methane and propane) into aquifers also hold promise. Aromatic substrates (phenol and toluene) are best used for treatment of chlorinated ethenes, whereas gaseous co-metabolic substrates are better suited for the treatment of chlorinated methanes and ethanes. In this study, we has focused co-metabolism of Methanotrophs using methane as a co-metabolic substrate. The abiotic and biotic transformation of epoxidess formed during the co-metabolism of chlorinated ethanes by OB3 cultures expressing sMMO was observed. The epoxides of VC and TCE were rapidly transformed abiotically. The cis-1,2 DCE epoxide was transformed by sMMO in the whole cells. No ability to transform the epoxide of t-DCE was observed. The transformation of the c-DCE epoxide was shown to inactivate cells, resulting in decreased transformation.

경유류로 오염된 지반의 오염범위 산정 및 복원공법 제시

어성욱,손봉호,손민식,Eo, Seong-Uk,Son, Bong-Ho,Son, Min-Sik (사)한국토질및기초기술사회 2008 지반과 기술 Vol.5 No.2

가축분뇨 자원화 처리시 수질오염물질 삭감율 산정 연구

어성욱 한국물환경학회 2017 한국물환경학회지 Vol.33 No.6

Livestock manure is known as the main cause of non-point pollutant in agricultural area. Pollutant reduction ratio of livestock manure recycling to fertilizers was measured in order to analyze the effect on water quality of Total Maximum Daily Load (TMDL) system in Korea. The reduction ratio has been applied by theoretical consideration without survey and there is no value for TOC newly introducing organic item. The reduction ratio of each pollutant from this study was revealed as follows; TOC, BOD, T-N and T-P were 0.34, 0.60, 0.37, and 0.42 for individual farm and 0.38, 0.61, 0.45 and 0.44 for entrustment facilities, respectively. The reduction ratio of individual farm was surveyed as TOC 0.63, BOD 0.62, T-N 0.42 and T-P 0.32 for liquid fertilizer and TOC 0.30, BOD 0.64, T-N 0.40 and T-P 0.48 for compost. Total reduction ratio was derived by multiplying the ratio for liquid fertilizer and compost by the respective load. Compared to the pollutant reduction ratio of the individual farm with entrustment facilities marking the higher in liquid fertilizer and the lower in compost. Through this study, we found the difference of pollutant reduction ratio between livestock manure recycling method and facilities. Although phosphorus known as a preservative matter, the treatment efficiency of T-P is analyzed to decrease by chemical precipitation.

분뇨의 영양소 제거

어성욱,최의소 대한환경공학회 1993 대한환경공학회 학술발표논문집 Vol.1993 No.12

양돈 퇴, 액비의 수질환경 영향분석을 위한 영양물질 이동경로 연구

어성욱 한국습지학회 2011 한국습지학회지 Vol.13 No.3

액비와 퇴비 형태로 발생되어지는 양돈 분뇨는 발생량의 대부분이 농지에 적용되어지고 있다. 과잉으로 적용된 양돈 퇴, 액비는 수계의 영양소 과잉의 주원인으로 알려지고 있는데 양돈 퇴, 액비의 질소, 인 물질이 농지로부터 지표수와 지하수로 전달되어지는 경로를 파악하는 것이 본 연구의 주목적이다. 인공 강우 시험을 통해 농지로부터 양돈 퇴비와 액비가 각각 적용되어진 농지에 대해 지하수와 지표수로 유출되는 양을 조사하였는데 질소의 경우 지하수로 유출되는 부분이 가장 많은 반면 인의 경우 토양에 흡착되는 부분이 가장 많은 것으로 나타났다. 토양에 대한 인의 평균 흡착 양은 21.5 mg P/kg soil 로 나타났다.

산업폐수의 NBDCOD 제거를 위한 고도처리 공정의 비교 연구

어성욱 우송대학교 부설 산업연구원 1999 산업연구 Vol.1 No.2

A comparative study on add-on processes for NBDCOD removal was conducted Using Aluminium Sulfate(alum), 80 mg/L dosage can result in 75 % CODcr, 27.8 % of CODmn and 78 % SS removal efficiency. Ozone oxidation was effective in NBDCOD removal. With 30 minute contact time(ozone generation rate was 1.5, 2.0 and 2.4 gO₃/hr, respectively), over 75 % of CODcr removal efficiency was obtained. In 2.0 gO₃/hr, optimum contact time was 10 minute, when CODcr and CODmn removal efficiency was 50%, 25.9% respectively. In Fenton's reagent oxidation process, the optimum reaction condition was H₂O₂/Fe²Ratio(W/W) 4/1.5, initial pH 4.0 and 30 minute reaction time. Applying this condition and 15 mg/L H₂O₂dosage, CODcr 25 %, CODmn 26 %, and SS 61.7% was obtained. In activated carbon adsorption test, optimum dosage was revealed 0.1 g/L of coconut powdered activated carbon and CODmn removal efficiency was 30.2 %. Sand filtration was able to remove 18.7 % of CODmn at the 101 m/d of filtration rate, too. As a result, activated carbon adsorption was the most effective add-on process to treat NBCOD of industrial wastewater and sand filtration was the most economical process.