| Summary: | 碩士 === 嘉南藥理大學 === 環境工程與科學系 === 106 === The purpose of this study was focused on developing a new reused method for waste sulfuric effluent from metal surface cleaning process of XXXX industrial Co. After identify and analyzing waste effluent compounds, the modification of wastewater treatment process and optimization operating parameters of wastewater treatment process had made by cooling process, changing pH, vaporization and crystallization to recovering sulfuric iron from the effluent. It was found that above medications method effective decreased the chemical sludge and total dissolved solids (TDS) in the effluent. The cost down of the modification of the wastewater treatment process were also discussed in this investigation.
In this study, the discharge waste acid contained iron concentration up to 43025 mg/L and 41200 mg/L TDS at 70℃. At low temperature operating condition, the solution crystallization green crystal was found and 303g iron sulfate was obtained with 1 liter waste under the best operating condition. It is possible to decrease 270 Kg/day iron waste from the process. It can be also concluded that recovery iron sulfate from the effluent waste is the best option to reduce the waste and improve the effluent wastewater quality and effectively cost down the treatment process.
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