| Title |
A Study on the Biological Treatment of Acid Pickling Wastewater Containing a High Concentration of Nitrate Nitrogen |
| Authors |
박상진 ( Sang Jin Park ) ; 이상혁 ( Sang Houck Lee ) |
| DOI |
https://doi.org/10.15681/KSWE.2015.31.3.253 |
| Keywords |
Acid pickling wastewater; Calcium; Nitrate; Sequencing batch reactor |
| Abstract |
The purpose of this study is the efficient biological treatment of highly concentrated nitrate nitrogen by calcium ion control present within the pickling wastewater. In laboratory scale’s experiments research was performed using a sequencing batch reactor and the evaluation of denitrification reaction in accordance with the injection condition of calcium ions, the surface properties of microorganisms, and the evaluation of sludge precipitability were performed. Results of the study showed that the denitrification reaction was delayed when injecting more than 600 mg/L of the calcium ion within the denitrification process. In addition, we observed the absorption form of calcium ions absorbed on the surface of microorganisms following an increase in the calcium ion dose. It was found that as the calcium ion dose increased the sludge precipitability also increased continuously and it is judged that a smooth denitrification induction is possible when treating the nitrate nitrogen by the calcium ion control of pickling waste water and the shortening of precipitation time enables a liquid operation to increase the reaction time. |