• Journal of Soil and Groundwater Environment
• /
• v.12 no.3
• /
• pp.1-9
• /
• 2007

As Total Maximum Daily Load program is being implemented, needs for the management and treatment of contaminated sediment are rising to attain cleaner water resources. In this paper, impacts and management methods of contaminated sediment were reviewed. Remediation technologies for contaminated sediment including dredging, natural attenuation, in situ solidification/stabilization, in situ biological remediation, in situ chemical remediation and capping were reviewed. Integrated remediation scheme was presented as well.

• Proceedings of the Korea Water Resources Association Conference
• /
• 2007.05a
• /
• pp.1174-1178
• /
• 2007

본 연구는 다양한 공법으로 설치 운영되고 있는 고도처리시설에 대한 처리효율 및 운영현황을 조사하여 고도처리공법 선정시 활용할 수 있는 기초자료를 제공하고, 각 공법별 현장적용 및 운영상 문제점을 파악하여 하수처리시설 운영의 효율성을 도모하기 위한 목적으로 실시하였다. 6개월 이상 운영 중인 하수종말처리시설 145개소를 대상으로 일반적 현황을 분석하고 실제 현장조사는 고도처리시설 37개소의 현장조사표를 중심으로 실시하였다. 고도처리 공법은 $A_2O$계열, SBR계열이 대부분을 차지하였으며 대규모처리장은 $A_2O$계열, 소규모처리장은 SBR계열이 주로 적용되었으며 대규모 하수처리시설일수록 유입수질의 농도 및 처리효율이 높고 톤당 시설설치비용과 유지관리비용이 적었다. 현장조사 결과, 첫째, 하수처리시설의 유입문제로 시설용량대비 하수유입량이 초과되거나 50%미만인 시설이 10개소로 조사되었다. 이에 따라 하수관거의 조속한 정비 및 인구감소에 따른 대책수립, 효율적인 운영을 위한 하수처리시설 증설 및 계열 축소운전이 필요하였다. 둘째, 각 처리공법별로 몇몇 문제점이 있어 공법사의 문제점 보완, 운영기술전수 및 원활한 A/S가 필요한 것으로 나타났다. 셋째, 운영관리자가 수시로 현상을 파악하고 주의하여 운전해야 하는 것으로 나타났다.

• Korean Chemical Engineering Research
• /
• v.52 no.4
• /
• pp.503-515
• /
• 2014

A lot of existing wastewater treatment plants (WWTPs) are rebuilt or retrofitted for advanced wastewater treatment processes to cope with reinforced effluent criteria of nitrogen and phosphorous. Moreover, how to treat the wasted sludge from WWTPs has been also issued since the discharge of the wasted sludge into ocean is impossible from 2011 due to the London Convention 97 protocol. These trend changes of WWTPs get a motivation to assess environmental and economic impacts from the construction stage to the waste stage in WWTPs. Therefore, this study focuses on evaluation of environmental and economic impacts of the advanced wastewater treatment processes and waste sludge treatment process by using life cycle assessment. Four advanced wastewater treatment processes of Anaerobic/Anoxic/Oxic ($A_2O$), 5 stages-Bamard Denitrification Phosphate (Bardenpho), Virginia Initiative Plant (VIP), and Modified University of Cape Town (MUCT) are chosen to compare the conventional activated sludge (CAS) and three waste sludge treatment methods of land fill, incineration, and composting are used. To evaluate environmental and economic impacts of each advanced wastewater treatment processes, life cycle assessment (LCA) and life cycle cost (LCC) are conducted based on International organization for standardization (ISO) guidelines. The results clearly represent that the $A_2O$ process with composting shows 52% reduction in the environmental impact than the CAS process with landfill. On the other hand, the MUCT process with composting is able to save 62% of the life cycle cost comparing with the CAS process with landfill. This result suggested the qualitative and quantitative criteria for evaluating eco-environmental and economic technologies of advanced treatment processes and also sludge treatment method, where their main influence factors on environmental and economic impacts are analyzed, respectively. The proposed method could be useful for selecting the most efficient and eco-friendly wastewater treatment process and sludge treatment method when retrofitting the existing WWTPs to advanced treatments.

• Environmental engineer
• /
• s.8
• /
• pp.18-19
• /
• 1986

• Environmental engineer
• /
• s.4
• /
• pp.14-15
• /
• 1986

• Environmental engineer
• /
• s.5
• /
• pp.12-15
• /
• 1986

• Environmental engineer
• /
• s.7
• /
• pp.12-13
• /
• 1986

• Korean Chemical Engineering Research
• /
• v.48 no.5
• /
• pp.589-597
• /
• 2010

Strengthening the regulation standard of biological nutrient in wastewater treatment plant(WWTP), the necessity of repair of WWTP which is operated in conventional activated sludge process to advanced nutrient removal treatment is increased. However, in full-scale wastewater treatment system, it is not easy to fine the optimized operational condition of the advanced nutrient removal treatment through experiment due to the complex response of various influent conditions and operational conditions. Therefore, in this study, an upgrading design of conventional activated sludge process to advanced nutrient removal process using the modeling and simulation method based on activated sludge model(ASMs) is executed. And a design optimization of advanced treatment process using the response surface method(RSM) is carried out for statistical and systematic approach. In addition, for the operational optimization of full-scale WWTP, a correct analysis about kinetic variables of wastewater treatment is necessary. In this study, through partial least square(PLS) analysis which is one of the multivariable statistical analysis methods, a correlation between the kinetic variables of wastewater treatment system is comprehended, and the most effective variables to the advanced treatment operation result is deducted. Through this study, the methodology for upgrading design and operational optimization of advanced treatment process is provided, and an efficient repair of WWTP to advanced treatment can be expected reducing the design time and costs.

• Journal of Korean Tunnelling and Underground Space Association
• /
• v.5 no.4
• /
• pp.371-388
• /
• 2003

The tunnels that longer than 2km which have been recently constructed have serious noise problems resulting from the friction of vehicle wheels and pavement. In special, concrete pavement inside tunnels with a closed characteristic increases discomfort due to the traffic noise and the dust of pavement pollutes the air in tunnels. Therefore, it is urgent that we find out ways to cope with. This study purported to reduce noise inside tunnels covers the investigation of various pavement surface treatment methods adapted in developed countries, the analysis of the effect in noise reduction and construction methods and cases. The surface treatment method for silent pavement in tunnels reduced noise to 5dB (A)~10dB (A). Aggregate treatment method is evaluated the most appropriate method in that, related with other surface treatment method, it reduces noise and improves skid resistance. It is necessary for us to introduce equipments and design and rearrange of specification for the development of the silent pavement method in Korea.

• Magazine of the Korean Society of Agricultural Engineers
• /
• v.26 no.3
• /
• pp.17-19
• /
• 1984