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기존 정수처리방법으로 제거가 어려운 유기물에 대한 실험적 연구
우달식,남상호 한국환경보건학회 1995 한국환경보건학회지 Vol.21 No.4
As a basic experiment to develope biological pretreatment proces~ in water treatment, the experiments on biodegradability and isothermal adsorption of activated carbon were performed on refractories such as humic acid, $NH_3-N$, phenol and ABS which caused the problems in drinking water treatment. Also, the treatabilities on humic acid were examined in the continuous flow type reactors. The removal efficiencies of humic acid, $NH_3-N$, phenol and ABS in the biodegradable experiments for 5 days were 20.1%, 73.4%, 91.7% and 97.5%, respectively. In the isothermal adsorption test of refractories on activated carbon to be used as a media in the continuous flow type reactors, ABS and phenol are adsorbed easily, but humic acid and $NH_3-N$ are difficult to be done. The removal efficiencies of humic acid in granular activated carbon(GAC) reactor were about 7-8% higher than in biological activated carbon(BAC) reactor. The removal efficiencies of humic acid in biological fluidized bed(BFB) reactor were about 30% in GAC media, but were almost zero in sea sand media.
생물활성탄 유동상법에 의한 상수원수의 생물학적 전처리공정
우달식,남상호 한국환경보건학회 1998 한국환경보건학회지 Vol.24 No.1
This study was to investigate the effects of carbon loadings, temperature and expansion ratio on the waterborne organic removal by the biologically active GAC fluidized bed on a laboratory scale. The raw water to be treated comes from midstream of Han river. BACFB(Biological Activated Carbon Fluidized Bed) process was very effective to remove the biodegradable fraction of dissolved organic matter. The more carbon weighed, the more DOC removed in a range from 16.7 to 133.3 g/l. DOC and UV$_{254}$ were removed more than 40% and 20% above 20$\circ$C respectively. Between 5$\circ$C and 10$\circ$C, DOC and UV$_{254}$ were eliminated about 30% and 15% respectively. In general, even if the temperature was higher, DOC removal was a little sensitive, probably influenced by GAC's residual adsorption capacity. UV$_{254}$ reduction was little fluctuated in accordance with water temperature. The gradual increase in expansion ratio from 10% to 75% didn't greatly affect on the removal of DOC and UV$_{254}$. The expansion ratio, therefore, is not a key factor over the critical expansion ratio.
Corrosivity Evaluation of SWRO Membrane Desalted Permeate
우달식,황병기 대한토목학회 2014 KSCE JOURNAL OF CIVIL ENGINEERING Vol.18 No.1
To evaluate the corrosivity of seawater, the SWRO (Sea Water Reverse Osmosis) produced water, and the community tap water were used in this study. Weight loss method and potentiodynamic polarization test were applied to compare the corrosivity between them. Coupons and pipes for the experiments were prepared with the same materials such as carbon steel, zinc, copper, and STS304achieved in equivalent condition. As a result of experiments, seawater showed constituent ions such as Cl−, SO42−, Mg2+, and Ca2+ (in order of abundance), while the SWRO produced water showed lower pH, calcium hardness and alkalinity than the tap water. Since chloride ion, as an acceleration factor of corrosion, was highly detected, the test results of weight loss method and potentiodynamic polarization indicated that release of metal ions and weigh loss were more abundant in the SWRO membrane desalted permeate than in the tap water. Besides, corrosion potential was also lower in SWRO membrane desalted permeate. It represents that the surface of metal could be exposed easily to oxidize in SWRO condition due to low dissolved alkali metal ion of water.