• Environmental Engineering Research
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• 제24권3호
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• pp.501-512
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• 2019

The seasonal effects on the biostability of drinking water were investigated by comparing the seasonal variation of assimilable organic carbon (AOC) in full-scale water treatment process and adsorption of AOC by three filling materials in lab-scale column test. In full-scale, pre-chlorination and ozonation significantly increase $AOC_{P17\;(Pseudomonas\;fluorescens\;P17)}$ and $AOC_{NOX\;(Aquaspirillum\;sp.\;NOX)}$, respectively. AOC formation by oxidation could increase with temperature, but the increased AOC could affect the biostability of the following processes more significantly in winter than in warm seasons due to the low biodegradation in the pipes and the processes at low temperature. $AOC_{P17}$ was mainly removed by coagulation-sedimentation process, especially in cold season. Rapid filtration could effectively remove AOC only during warm seasons by primarily biodegradation, but biological activated carbon filtration could remove AOC in all seasons by biodegradation during warm season and by adsorption and bio-regeneration during cold season. The adsorption by granular activated carbon and anthracite showed inverse relationship with water temperature. The advanced treatment can contribute to enhance the biostability in the distribution system by reducing AOC formation potential and helping to maintain stable residual chlorine after post-chlorination.

• KSBB Journal
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• 제20권5호
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• pp.341-344
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• 2005

섬유상 담체를 이용한 2단 소형 바이오필터를 이용한 악취가스 처리공정의 운전조건을 확립하기 위하여 BTX를 처리대상 물질로 바이오필터를 연속적으로 운전하여 섬유상 바이오필터 담체에 악취가스 처리용 미생물을 부착시킨 결과 우수한 부착된 생물막을 형성하여 높은 처리효율 $93\%$를 얻을 수 있었다. 또한, 악취 유입 농도 400 ppm 미만에서 체류시간 10 sec일 때 1단 반응기에서 $76\%$ 정도 제거율을 보이다가 2단 반응기에서 약 $93\%$의 제거율을 나타내었다. 그러나 체류시간이 15 sec 이상인 경우에는 제거효율이 $97\%$ 이상 유지되었다.

• 상하수도학회지
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• 제25권3호
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• pp.383-390
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• 2011

In this study, a process combined biofiltration with sulfur-utilizing autotrophic denitrification and membrane separation was proposed to examine the efficiency of nitrogen removal. As an experimental device, hollow-fiber module was installed in the center of reactor to generate the flux forward sulfur layer in the cylinder packed with granular sulfur. In addition, a simple module was installed in activated sludge aeration tank which inside and outside of sulfur-using denitrification module was covered with microfilter and the module was considered as an alternative of clarifier. The experiment for developing new MBR process was carried out for three years totally. As the results of first two-year experiment, successful nitrogen removal performance was revealed with lab-scale test and pliot scale plant using artificial wastewater and actual plating wastewater. In this year, pilot scale test using actual domestic wastewater was performed to prove field applicability. As the results, high-rate nitrogen removal performance was confirmed with about 0.19 kg ${NO_3}^--N/m^3$ day of rate. Also significant fouling and pressure increase were not found during the experiment. And, the production ratio of sulfate and the consumption ratio of alkalinity showed a slightly higher value about 311 mg ${SO_4}^{2-}/L$ and 369 mg $CaCO_3$/L, respectively. In conclusion, the developed MBR process can be utilized as an alternative for retrofiting existing wastewater plants as well as new construction of advanced sewage wastewater treatment plants, with cost-effective merit.

• 상하수도학회지
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• 제11권2호
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• pp.94-104
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• 1997

Ozone Treatment is getting a common process in a water treatment plant all over the nation. Especially an advanced water treatment using ozone and biofiltration has been a typical method in the regions where using the Nak-Dong River as a drinking water source. The effectiveness of ozone treatment in a continuous flow contact system was investigated with sand filtered water of the Nak-dong River. Pilot tests of the experiments were performed three times of the year like June, August, and October 1995. Most degradable organics of sand filtered water were oxidized in the first and second contact chamber of the system. Ozone treatment was effective for the removal of UV254 absorbance. However, Noticeable removals of $KMnO_4$ demand and TOC(Total Organic Carbon) were occurred when their concentrations exceeded about 5mg/l. The organics causing $KMnO_4$ demand and TOC were degraded into lower molecular matter in an early stage of the ozone contact in the system. Dissolved oxygen concentration was increased after ozone treatment.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2002년도 추계학술발표회
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• pp.347-350
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• 2002

The petrochemical products can cause soil and groundwater contamination during their transportation and the use of the products, and while being contained in underground storage tanks(USTs) throughout the leakage. To treat the contaminated soil, the bioventing method is suitable for the remediation of semi-volatile compounds, such as diesel and kerosene. Biofiltration is one of possible method to treat the off-gas produced in the process of the bioventing. This study is related to the usage, effectiveness of treatment, and feasibility of two types of biofilter system made of ceramic-compost and polymer respectively to treat diesel VOCs at constant retention time of 20 sec. Compost biofilter showed the average removal efficiency of 73 % when the inlet concentration increased to 20 ppmv. Increased the inlet concentration decreased the microbial activities as well as the removal efficiency. On the contrary, the removal efficiency of the polyurethane biofilter was maintained at 88 % at the inlet concentration of 13 ppmv during ten days and was obtained to 80 % at the inlet concentration of 30 ppmv in spite of the drop of the efficiency in the sudden increase of the inlet concentration. At the beginning of the experiment it showed low removal efficiency at low inlet concentration due to the low microbial activity, however, as experiments proceed the removal efficiency could be obtained more than 80% at high inlet concentration.

• Journal of Biosystems Engineering
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• 제37권6호
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• pp.365-372
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• 2012

Purpose: Performance of slurry composting and biofiltration with methane production (SCB-M) using swine manure and sawdust was evaluated. The suitable specific liquid input (SLI) was determined at lab-scale SCB. Method: In lab-scale SCB, the SLI test was performed at liquid input rate of 0.04, 0.09, $0.17cc/cm^3$ with constant sawdust volume. In pilot-scale SCB-M, the swine manure was fed to methane digester at organic loading rate (OLR) of 0.25-0.5 g VS/L/d. The effluent from methane digester was filtered using SCB. Results: The SLI at $0.04cc/cm^3$ showed good performance in terms of retention time. In pilot-scale SCB, the removal of $NH_3$-N and total nitrogen (T-N) was found to be around 59% and 28%, respectively. Similarly, volatile fatty acid (VFA) and total chemical oxygen demand (TCOD) removal was found be 56% and 43%, respectively. Conclusions: For SCB-M process, the SLI of $0.04cc/cm^3$ is recommended. The performance of swine manure treatment was improved more by using SCB-M system than using methane digester only.

• 한국축산시설환경학회지
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• 제20권2호
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• pp.69-76
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• 2014

This study was aimed at investigating a filtration bed system for the production of liquid fertilizer using wastewater generated after anaerobic digestion of animal manure. Slurry, Compost, & Biofiltration-Methane System, designed by Korean National Institute of Animal Science, is now a standard method to recycle anaerobic digestion wastewater. However, currently provided protocol to run the system needs continuous upgrades as the system is relatively new and can be more cost-effective if few adjustments are made. In this study, we tried to enhance the capability of the system to process anaerobic digestion wastewater by replacing the bed materials with the cheaper one, and determining the time point of operation from which filtrates can be utilized for fertilization.

• Korean Chemical Engineering Research
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• 제45권4호
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• pp.372-377
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• 2007

본 연구에서는 생물학적 공정을 사용하여 황화수소를 제거하는데 있어 망상구조의 폴리우레탄 담체의 바이오필터 충진물로서의 특성을 유입가스농도와 유입가스량의 두 변수를 대상으로 조사하였다. 실험결과 망상구조의 폴리우레탄 담체를 적용한 바이오필터의 황화수소 최대제거용량은 $488.3g-H_2S/m^3{\cdot}h$이었으며, 추정된 임계부하속도는 $330.1g-H_2S/m^3{\cdot}h$이었다. 본 연구의 결과 망상구조의 폴리우레탄 담체를 황화수소의 생물학적 처리를 위한 바이오필터의 담체로서 적용가능성을 확인하였다.

• Korean Chemical Engineering Research
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• 제53권4호
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• pp.482-488
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• 2015

생물학적 방법에 의한 대기오염물질 처리는 기존의 처리방법을 대체할 수 있는 방법으로 각광을 받고 있다. 생물학적 처리방법은 유기화합물 또는 악취가 포함된 저농도 고유량의 공기를 처리하는데 효과적이다. 생물살수여과법을 이용한 대기오염물질 제거에서 물질전달 연구는 공정 최적화를 위해 매우 중요한 부분이다. 본 연구에서는 3상의 물질전달이 이루어지는 생물살수여과법에서 기체/액체(살수액), 기체/고체(미생물), 액체/고체 물질전달 실험방법 개발과 물질전달 현상을 고찰하였다. 또한 본 연구에서는 각 상간에서 물질전달에 영향을 미치는 인자로 동적적체량, 기/액 유량비, 반응기내 미생물량, 살수액 순환량 등에 대해 고찰하였다.

• Korean Chemical Engineering Research
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• 제53권4호
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• pp.489-495
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• 2015

대기오염물질처리를 위한 생물살수여과법에서 물질전달현상을 이해하기 위한 선행 실험결과를 기초로 각각의 운전조건에서 기체/액체(살수액), 기체/고체(미생물)와 액체/고체에서의 model을 이용하여 물질전달계수를 평가하였다. 생물살수여과법에서 기/액에서는 정상상태물질수지, 그리고 액/고와 기/고에서는 동적물질수지를 이용하여 물질전달 model을 확립하고 그 결과를 고찰하였다. 물질전달 model은 여과탑을 일정크기 구획하여, 각 구획에서 동적 물질수지식을 수치해석 전산코드를 이용해 계산하였다. 동적물질수지식을 이용하여 계산된 결과는 실험결과와 비교하여 생물살수여과법에서 기/액, 기/고, 액/고 각상간의 물질전달계수($K_La$)를 산정하였다. 본 연구에서는 대기오염제어를 위한 생물살수여과법에서 물질전달계수를 결정하기 위한 실험방법개발과 model을 이용하여 물질전달현상을 고찰하였다.