• Environmental engineer
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• s.115
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• pp.17-21
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• 1996

• Environmental engineer
• /
• s.114
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• pp.10-15
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• 1996

• Environmental engineer
• /
• s.121
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• pp.38-45
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• 1996

• Environmental engineer
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• s.113
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• pp.28-38
• /
• 1996

• Proceedings of the Membrane Society of Korea Conference
• /
• 1994.10a
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• pp.21-23
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• 1994

무방류폐수처리 시스템 개발에 막분리공정이 핵심적인 기술로 자리잡고 있다. 그러나 막분리기술의 경제성을 높히고 적용범위를 확대하기 위해서는 새로운 막의 개발과 폐수처리에서 항상 문제가 되는 fouling의 원인규명 및 막세척방법의 개발이 절실히 요구되고 있다. 본 연구에서는 염료폐수처리 및 재활용을 위한 pilot 실험에의 막의 fouling 현상과 세척효과를 역삼투막인 BW-30(2540)과 Nanofiltration막인 NF-40(2540) 모듈을 사용하여 조사하였다. RO 투과수에 의한 물리적 세척법인 flushing과 화학적세척을 실시하여 투과율 회복능력을 조사하였다.

• Proceedings of the Membrane Society of Korea Conference
• /
• 1991.10a
• /
• pp.49-50
• /
• 1991

최근 산업폐수의 수질오염에 대한 국민적 관심이 높아지면서 정부의 배출수 수질기준강화 및 배출부과금의 인상 등으로 기업의 폐수처리에 관한 인식이 상당히 달라졌다. 기존의 폐수처리는 각공정에서 발생되는 폐수는 종합적으로 수집하여 처리하는 소위 END OF PIPE 처리방법이 대부분이며 산화/환원, 응집/침전, 미생물분해, 여과 등이 주로 사용되고 있다. 그러나 END OF PIPE 처리방식에서는 소량이지만 처리가 어렵거나 독성이 강한 물질이 일부분의 공정에서 발생되어도 분리처리되지 않고 전체적으로 합쳐지므로 처리시설이 복잡하고 규모도 커진다. 따라서 최근의 폐수처리는 각 생산공정에서 발생되는 폐수를 소규모의 처리시설로 처리하기 어려운 소량의 오염물질을 제거하거나 유효성분일 경우 회수하여 재활용하는 방향으로 연구가 진행되고 있다.

• Proceedings of the Membrane Society of Korea Conference
• /
• 2002.11a
• /
• pp.170-173
• /
• 2002

• Resources Recycling
• /
• v.31 no.5
• /
• pp.3-19
• /
• 2022

Electro-membrane technology is a process for separating and purifying substances in aqueous solution by electric energy using an ion exchange membrane with selective permeability, such as electrodialysis (ED) and bipolar electrodialysis (BMED). Electro-membrane technology is attracting attention as an environmental friendly technology because it does not generate by-products during the process and the recovered base or acid can be reused during the process. In this paper, we investigate the principles of ED and BMED technologies and various characteristics and problems according to the cell configuration. In particular, by investigating and analyzing research cases related to the treatment of waste sodium sulfate (Na₂SO₄), which is generated in large amounts during the metal recovery process.

• Korean Journal of Agricultural Science
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• v.26 no.1
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• pp.77-83
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• 1999

The populations of microorganisms adhered on rice straws which had been ricked in the fields around Chungchong areas during the winter season from February to March in 1998 were investigated. The number of mesophilic bacteria including bacilli was generally high in the middle part of straw. And it appeared to be higher in the samples from rural areas than those from suburb. Thermophilic bacteria and actinomycetes were rarely to be detected in most samples. Coliform bacteria were detected in a few samples which collected from Kwanpyong-dong of Taejon-city, Jangpyong-meun and Jungsan-meun of Chongyang-koon, indicating that these areas were contaminated by sewage and livestock wastes. Following the fermentation of Chungkukgang employed the middle parts of straws from Mok-meun of Chongyang-koon as a source of microbial inoculum, qualities of the fermented products such as amino-nitrogen content, viscosity and protease activity, were examined: the application of rice straws resulted in better qualities of the fermented products when compared to the control, however the methods of application appeared to have little or no effect on the quality.

• Journal of the Korean Applied Science and Technology
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• v.36 no.4
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• pp.1088-1095
• /
• 2019

The CKD extract is wastewater from which KCl in CKD has been removed to reuse CKD as a cement raw material, and tried to reuse no extracts due to problems such as wastewater treatment facility expansion. As a result of removing KCl by the ion exchange method, the pH of the extract after ion exchange decreased from 12.7 to less than pH 2, and it was confirmed that H⁺ of the cation exchange resin was dissolved in the extract through ion exchange. In addition, the selectivity of the ion exchange was removed in the order of Ca²⁺, K⁺, it was determined that the increase in the contact time to remove the K⁺ ions. The batch system had a contact time of 6 times or more, compared to the continuous system, and showed 4 times of K⁺ removal efficiency and 7 times of Cl^- removal efficiency. It was showed by analyzing the pH of the extract that more H⁺ of the cation exchange resin was extracted than OH^- of anion exchange resin as the pH of the extract was changed.