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RISS 인기검색어
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- 저자 : 류홍덕(Hong Duck Ryu) (검색결과 48 건)
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INT-Dehydrogenase 시험법에서 슬러지 일령이 Cr<sup>6+</sup>, Zn<sup>2+</sup> 및 Cd<sup>2+</sup> 독성에 미치는 영향
류홍덕,이상일,김종수,Ryu, Hong-Duck,Lee, Sang-Ill,Kim, Jong-Soo 한국환경농학회 2008 한국환경농학회지 Vol.27 No.4
This study was initiated to elucidate the relation between the toxicity of $Cr^{6+}$, $Zn^{2+}$, and $Cd^{2+}$ and sludge age (Solids retention time, SRT). The effect of SRT on the toxicity of $Cr^{6+}$, $Zn^{2+}$, and $Cd^{2+}$ in activated sludge system was investigated with INT-dehydrogenase assay. Experimental results showed that the inhibitory effects of $Cr^{6+}$, $Zn^{2+}$, and $Cd^{2+}$ were reduced as the sludge age increased from SRT 5 d to SRT 25 d. It is noteworthy that the experimental results enabled to determine the relative toxicity of the tested metals depending on the sludge age. At the SRT of 5 and 9 days, the order of toxicity of the three metals to the activated sludge was $Cr^{6+}$ > $Zn^{2+}$ > $Cd^{2+}$ (the $IC_{50}$ value of $Cr^{6+}$, $Zn^{2+}$, and $Cd^{2+}$ was 16.15, 25.90, and 32.49 mg/L, respectively) and $Zn^{2+}$ > $Cr^{6+}$ > $Cd^{2+}$ (the $IC_{50}$ value of $Cr^{6+}$, $Zn^{2+}$, and $Cd^{2+}$ was 39.12, 27.93, and 42.31 mg/L, respectively), respectively. However, the toxicity of three metals was almost same at the SRT of 14 and 25 days (the range of $IC_{50}$ in SRT 14 and 25 days was from 49.80 mg/ L to 53.44 mg/L among three heavy metals). This results would be explained by that the quantity of biopolymer formed in short SRT was small, whereas that in long SRT was large. Consequently, it is recommended that sludge age be maintained at long SRT in order to avoid the toxicity inhibition of heavy metals such as $Cr^{6+}$, $Zn^{2+}$, and $Cd^{2+}$.
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유입부하가 DEPHANOX 및 Modified-DEPHANOX 공정에 미치는 영향
류홍덕,민경국,이상일,Ryu, Hong-Duck,Min, Kyung-Kook,Lee, Sang-Ill 한국물환경학회 2004 한국물환경학회지 Vol.32 No.2
This study was initiated to evaluate the efficiencies of DEPHANOX and Modified-DEPHANOX, which were devoloped to enhance nitrogen removal efficiency in municipal wastewater treatment. In the results, removal efficiency of organic matters was not affected much by increased loading rate of organic matters which is contained in influent. The nitrogen removal efficiencies according to the loading rate of influent TN was decreased drastically in conditions of over $0.2kg/m^3{\cdot}day$, which is T-N loading rate, and the DEPHANOX process was affected more sensitively than the M-DEPHANOX was. When the temperature was altered from $25^{\circ}C$ to $16^{\circ}C$ at HRT 6hrs, the removal efficiency of ammonia nitrogen was still over 90% and it was concluded that both DEPHANOX and M-DEPHANOX were strong enough to endure temperature variation. Moreover, both processes showed over 90% in ammonia removal efficiencies in over HRT 5hrs, so it was concluded that they were strong in HRT variation. M-DEPHANOX process showed a higher value than DEPHANOX did in T-N removal efficiency to the extent of 4~21 %, which resulted from differency of denitrification rates and the biosorption efficiency of organic matter in both processes. In the condition of HRT less than 4hrs, concentrations of ammonia nitrogen contained in effluents and nitrification reactors, might be sensitively affected by biosorption efficiency of organic matters in first separation tank. In the effect of effluent nitrate concentration in phosphorus removal, the more effluent nitrate concentration was decreased, the more phosphorus removal efficiency was increased. This result is related to the decrease of concentration of effluent nitrate which resulted from nitrification inhibition by decreased HRT.
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INT-Dehydrogenase 시험법에서 슬러지 일령이 Cr6+, Zn2+ 및 Cd2+ 독성에 미치는 영향
류홍덕 ( Hong Duck Ryu ),이상일 ( Sang Ill Lee ),김종수 ( Jong Soo Kim ) 한국환경농학회 2008 한국환경농학회지 Vol.27 No.4
This study was initiated to elucidate the relation between the toxicity of Cr6+, Zn2+, and Cd2+ and sludge age (Solids retention time, SRT). The effect of SRT on the toxicity of Cr6+, Zn2+, and Cd2+ in activated sludge system was investigated with INT-dehydrogenase assay. Experimental results showed that the inhibitory effects of Cr6+, Zn2+, and Cd2+ were reduced as the sludge age increased from SRT 5 d to SRT 25 d. It is noteworthy that the experimental results enabled to determine the relative toxicity of the tested metals depending on the sludge age. At the SRT of 5 and 9 days, the order of toxicity of the three metals to the activated sludge was Cr6+ > Zn2+ > Cd2+ (the IC50 value of Cr6+, Zn2+, and Cd2+ was 16.15, 25.90, and 32.49 mg/L, respectively) and Zn2+ > Cr6+ > Cd2+ (the IC50 value of Cr6+, Zn2+, and Cd2+ was 39.12, 27.93, and 42.31 mg/L, respectively), respectively. However, the toxicity of three metals was almost same at the SRT of 14 and 25 days (the range of IC50 in SRT 14 and 25 days was from 49.80 mg/L to 53.44 mg/L among three heavy metals). This results would be explained by that the quantity of biopolymer formed in short SRT was small, whereas that in long SRT was large. Consequently, it is recommended that sludge age be maintained at long SRT in order to avoid the toxicity inhibition of heavy metals such as Cr6+, Zn2+, and Cd2+.
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