摘要(英) |
Suspended solids is not only one of the standard of environmental regulations regulating the flow of suspended solid particles, but also has tremendous hazard impacts on the environment. Therefore for wastewater treatment, how to monitor and control the processing unit effectively is one of the important tasks. In recent years, spectrophotometry spectroscopy has developed quite mature, not only fast and economic, but also able to conduct a multi-component analysis of water samples. For the removal of suspended solids, we used to rely on gravity precipitation to remove the precipitation processing unit, so the particle precipitation characteristics and the hydraulic retention time settings will play a decisive role on the efficiency of processing units. In this study, the absorption spectra measured by the spectrophotometer were analyzed for the effect of suspended solids; using the principle of proportionality of visible light absorption area to establish a measurement method which can be applied in the real factory process in automated monitoring and control. Due to the detect range of instruments, the measurement method has better measurement results in the range of 30 mg / L ~ 250 mg / L. In the measurement of the hydraulic retention time, this study through the combination of suspended solids measurement and repeatedly scan to estimate the hydraulic retention time. In the scan time about 1500 seconds, when the precipitation efficiency of the particles reach a certain level, you can calculate the time point that the precipitation amount does not change through 1500 seconds of scan data. And then assume that the precipitation amount for this time point is fixed, we can value the concentration of suspended solid particles in the subsequent time. Further, assume that when the time the particle concentration is lower than 30 mg / L is the time required for the hydraulic retention time. However, this method, due to the assumption of the precipitation amount being fixed, is not the same with the realities. So the resulting hydraulic retention time is shorter than the real required time. But in the of view of the automatic monitoring and control, there are sufficient information required to control the precipitation processing unit, and further to improve the efficiency of the precipitation processing unit.
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參考文獻 |
Azema .N, M.-F. Pouet, C. Berho and O. Thomas, (2002) “Wastewater Suspended Solids Study By Optical Methods,” Colloids and Surdaces, 204, pp. 131-140.
Baldock, T.E, M.R. Tomkins, P. Nielsen and M.G. Hughes, (2004) “Settling Velocity of Sediments at High Concentrations Settling Velocity of Sediments at High Concentrations,” Coastal engineering, vol. 51, pp 91-100.
Douglas .A , F. James, and A. Timothy, (1998) “Principles of Instrumental Analysis,” Instrumental analysis.
Dyer. K.R and A.J. Manning, (1999) “Observation of The Size, Settling Velocity and Effective Density of Flocs, and Their Fractal Dimensions,” Journal of sea research, vol. 41, pp 87-95
Olivier Thomas,Christopher Burgess, (2007) “UV-Visible Spectrophotometry of Water and Wastewater”, Elsevier Science.
O.Thoman,C.Burgess, (2007). “UV-Visible Spectrophtometry of Water and Wastewater,”Elsevier B.V All rights reserved
Pouet .M.-F, N. Azema, E. Touraud and O. Thomas, (2007) “Physical and Aggregate Properties,” UV-Visible Spectrophotometry of Water and Wastewater,.
Thomas .F, S.Theraulaz , Vaillant and M.-F. Pouet, (2007). “Urban Wastewater,” UV-Visible Spectrophotometry of Water and Wastewater
Wu J. and C. He , (2010) “Experimental and Modeling Investigation of Sewage Solids Sedimentation Based on Particle Size Distribution and Fractal Dimension,” International journal of Environmental Science and echnology 7 (1), PP.37-46
X. Y Li., Yang Z. l., and Zhou H. G., (2004) “Studying The Absorption Spectrum Properties of The Gold Nanosphere - The Effect of The Size onThe Absorption Spectra of The Nanoparticles,” Journal of Southwest China Normal University, 17(2),.
江志威,2009「水位與SS即時自動監測技術與裝置之發展與建立」,國立中央大學環境工程研究所碩士論文。
李姿儀,2009「利用多波長UV/VIS吸收光譜建立廢水中SS與COD自動監測技術之可行性研究」,國立中央大學環境工程研究所碩士論文。
游佩蓉,2009「懸浮顆粒沉澱特性量測技術與裝置之發展與建立」,國立中央大學環境工程研究所碩士論文。
廖憶華,2006「以光學頻譜分析定性及定量廢水水質特性之研究」,國立中央大學環境工程研究所碩士論文。
楊秉軒,2011「水及廢水處理反應槽SS濃度光學卽時監測技術之發展與建立」 ,國立中央大學環境工程研究所碩士論文。
劉鴻慶,2009「利用UV/VIS/NIR吸收光譜同步量測水中SS、有機物及重金屬之研究」,國立中央大學環境工程研究所碩士論文。
鄭禹祥,2007「COD、SS及流量及時自動監測系統之發展與建立」,國立中央大學環境工程研究所碩士論文。
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