| Summary: | 碩士 === 國立中央大學 === 環境工程研究所在職專班 === 101 === Abstract
Traditional chemical coagulation method used for heavy metal wastewater treatment, must adding a great quantity of Caustic Soda Flake, Sodium hydroxide, coagulate agent ,flocculating agent or chelating agent of heavy metal ,etc. Caused pharmacy costs of huge consumption, produce a great quantity of harmful heavy metal sludge and subsequent processing. Extremely discrepant to principles of environmental economic. When using circulating electrolysis method to treatment of heavy metal wastewater, after electrolysis recovered acid can be reused in the wastewater treatment plant's acidification process unit. And after electrolytic produced copper tube has the value of recycling. To the end of the whole process nearly zero waste. But the electrolysis process, due to the concentration of heavy metals in continuous change. The current heavy metal detection methods such as a spectrophotometer assay or flame atomic absorption spectrometry, etc. From sampling to analytical results is time-consuming work, unable to provide immediate and accurate data, unable to provide immediate and accurate data. Due to lack of immediate concentration of heavy metals in the electrolytic parameters can not be set to establish the conditions, cause the equipment to make virtual workers and consume disposal costs.
This study used waste high acid cycle electrolysis equipment in real factory for the batches sample objects, the use camera apparatus to interception sample digital image and analysis of RGB values, using flame atomic absorption spectrometer measured sample concentration of copper ions, combined conductivity by multiple linear regression method to establis regression model measurement method. Subsequent samples by the equipment obtained RGB values and conductivity values into the formula to provide fast and accurate waste sulfate copper concentration for site operators to refer for as an adjustment equipment processing condition setting basis.
The research results show that the electrolytic treatment process of sulfate copper waste liquid, due to the electrolysis cell residual waste copper powder with infusion new waste liquid combined, caused copper ion concentration appear upward trend. After about 4 to 5 hours to reach highest concentration than start appear to diminishing status, average hourly copper ion concentration was reduced by approximately 1 g / L. Waste liquid color change is from blue into green, and finally become brown end. Verification using RGB and conductivity conducted analysis of sulfate copper to estimate the concentration of copper ions to good effect. Future combined with automatic monitoring technology can be instant access to the waste liquid concentration, for electrolytic equipment processing to basis of automatic control parameter conditions and applied to the warning message notification. Increase the stability of the electrolytic process, reduce the cost of recycling ,prolong the life of supplies and improve electrolysis of poor quality,etc.
Keywords: UV-VIS-NIR, AA, RGB, Mulitiple Regression Analysis
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