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국내 최대 정보 기계·건설 공학연구정보센터
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  • ARMRACK/ART
  • 학위논문초록

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    학위논문초록 제목 게시판 내용
    제목(국문)
    제목(영문) Inactivation of planktonic and biofilm cells by copper-based hybrid disinfection systems: Application to biofouling control on RO membranes
    저자 Lee, Hye-Jin
    초록

    abstract is not available for this article

    초록(영문) Development of biofilm is easily found in any moist environment, and it causes a number of problems, especially financial losses in the industrial field, when it occurs in undesired places, such as membranes, heat exchanger systems, ship hulls, and drinking water distribution systems. In particular, the formation of biofilm on the membrane surface (biofouling) is one of the biggest challenges to the performance of the reverse osmosis (RO) process. In this dissertation, three different types of copper-based disinfection systems including oxidative disinfectants, biocides, and signal molecule were investigated to control biofilm formed on RO membrane. The first part of the dissertation investigates combinations of Cu(II) with hydroxylamine (HA) and hydrogen peroxide (H2O2) (i.e., Cu(II)/HA, Cu(II)/H2O2, and Cu(II)/HA/H2O2 systems) for the control of Pseudomonas aeruginosa biofilms on RO membranes. These Cu(II)-based disinfection systems effectively inactivated P. aeruginosa cells, exhibiting different behaviors depending on the state of bacterial cells (planktonic or biofilm) and the condition of biofilm growth and treatment (normal or pressurized condition). The Cu(II)/HA and Cu(II)/HA/H2O2 systems were the most effective reagents for the inactivation of planktonic cells. However, these systems were not effective in inactivating cells in biofilms on the RO membranes possibly due to the interactions of Cu(I) with extracellular polymeric substances (EPS), where biofilms were grown and treated in center for disease control (CDC) reactors. Differ from the results using CDC reactors, in a pressurized cross-flow RO filtration unit, the Cu(II)/HA/H2O2 treatment significantly inactivated biofilm cells formed on the RO membranes, successfully recovering the permeate flux reduced by the biofouling. The pretreatment of feed solutions by Cu(II)/HA and Cu(II)/HA/H2O2 systems (applied before the biofilm formation) effectively mitigated the permeate flux decline by preventing the biofilm growth on the RO membranes. The second
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    학교 울산과학기술대학교
    지도교수 Lee, Changha
    학위구분 박사
    • 페이스북아이콘
    • 트위터 아이콘

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