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정경훈,최형일,정오진,Cheong, Kyung-Hoon,Choi, Hyung-Il,Jung, Oh-Jin 한국환경보건학회 1999 한국환경보건학회지 Vol.25 No.3
A laboratory experiment was performed to investigate the phosphorus removal using the activated sludge-electrolysis reactor which consisted of A$^2$/O system and aluminium electrodes as cathode and anode. In this system, the phosphorus was removed by aluminium ion, which was eluted from aluminiumelectrodes by electrolysis. In the batch experiments, when the current densities were 0.026, 0.052 and 0.08 A/dm$^2$, the phosphorus removal efficiencies for synthetic sewage were 66.4, 86.4 and 98.7% respectively. These results showed that the phosphorus removal efficiency increased with the increase of the current density. When the current values were 13, 26 and 40 mA respectively, the amounts of Al$^{3+}$ eluted from electrodes according to Faraday's law were 0.049, 0.07 and 0.12 g and Al/P mole ratio were 1.1, 2.0 and 3.41. In the continuous experiments, As hydraulic retention time(HRT) increased, COD and total nitrogen(T-N) removal efficiencies for domestic sewage increased. The average phosphorus removal rates of the activated sludge-electrolysis system were 97, 91, 80 and 80% at the HRT of 48, 24, 18 and 12 hours, respectively. Especially, the phosphorus removal rate in the activated sludge system with aluminium electrodes was higher than that in the system without aluminium electrodes.
염화철코팅 활성탄을 이용한 지하수 중의 질산성질소 제거를 위한 연구
정경훈,정오진,최형일,박상일,박대훈,Cheong Kyung-Hoon,Jung Oh-Jin,Choi Hyung-Il,Park Sang-Il,Park Dae-Hoon 한국환경보건학회 2005 한국환경보건학회지 Vol.31 No.2
A laboratory experiment was performed to investigate the nitrate removal from groundwater using Iron chloride(III) coated activated carbon (ICCAC). The breakthrough profiles of two ionic species, such as nitrate and sulfate showed that nitrate was selectively exchanged with chloride in ICCAC. The $FeCl_3$-coated activated carbon produced about 26 BV (Bed volume) of throughout when treating groundwater containing about $25\;mg/\iota\;of\;NO_3-N$. The regeneration of ICCAC with 1M KC1 was effective at a flow rate of 4 BV/hr. The ion exchange technology seems to be suitable technology for the treatment of small volumes of groundwater polluted by nitrate.
정경훈,양영기,임채영,최형일,허윤희 ( Kyung Hoon Cheong,Young Ki Yang,Chae Young Lim,Hyung Il Choi,Yune Hee Her ) 한국물환경학회 1996 한국물환경학회지 Vol.12 No.1
A laboratory experiments were performed to investigate the effectiveness of pellets formed by Aspergillus niger on the treatment of wastewater containing high concentration of starch and glucose. Pellets were prepared by using pure culture in wheat bran media. The size of pellets formed became small as the pH of medium decrease. In batch experiments, starch was degraded within 0.5 hour and the glucose produced from the starch decomposition was degraded. The glucose production decreased with increasing cell concentration in the range of 5 × 10^5 to 15 × 10^5 spores/㎖. During the continuous experiments, the total COD and starch removal rate were 94% and 100% at the HRT of 12 hours in the fungal pellets reactor conbined with activated sludge reactor when both synthetic and ice cream wastewater were used. The glucose produced from the starch decomposition was degraded to 100% in this system.