| dc.description.abstract | In order to achieve the purpose of wastewater treatment automation and improved the water quality and stability in future, we must be able to collect the water quality and quantity characteristics of the wastewater in wastewater treatment system immediately. This study is focused on the concentration of chemical oxygen demand. For water quality, effluent concentration of the wastewater treatment system must comply with the emission standards of the regulations; for process control, operator must be able to monitor the concentration information to control the wastewater treatment process appropriately. Therefore, measure the COD concentration for the environment or water treatment control is very important. In this study, using optical measurement techniques to establish the COD concentration measurement method, and through the water sample pre-treatment program to reduce the interference.By using spectrophotometer scan, we can get some of the wastewater characteristics. Besides, we build the relationship between the absorbance of the organic and COD concentration to quantify the COD concentration. Overall, in three kind of water sample pre-treatment process, consider the analysis time and economic costs ,dilution procedures is the best process.This method validation results for COD concentration of two PCB companies are as follows: T company estimated of the COD concentration compared to standard method, the mean difference for inflow and outflow is 15.91 % and 7.00 %; S company T the mean difference for inflow and outflow is 29.48 % and 22.77 %. Both of two companies had good validation results, and this COD concentration measuring method will build case by case for different water quality characteristics of wastewater. In future, it will combined with automatic monitoring technology, to gain the water quality conditions immediately, or provide for warning messages when COD concentration is unusual.
| en_US |