알루미늄 전극을 이용한 하수내 질소, 인 제거

초록

To enhance water quality standards, the removal of nitrogen (N) and phosphorus (P) has required additional chemical treatment in wastewater treatment plants. This demand has caused problems such as excessive chemical injection and an increase in the amount of sludge production. To deal with these problems, this study investigated the efficiency of electrochemical N and P removal from sewage wastewater and biologically treated water using aluminum and stainless steel (Al-SUS) electrodes in the existing sewage treatment method. The operating variables in this study are the reaction time and current density of the electrode. Overall, the longer the reaction time and the higher the current density, the greater the tendency for BOD, TN, and TP removal efficiency. However, TP concentration in effluent was ≤ 0.1 mg/L regardless of the reaction time when the current density was ≥ 5 mA/㎠, and ≤ 0.06 mg/L regardless of the current density when the reaction time was 10 min. The TN concentration in the effluent increased as the current density and reaction time increased. Furthermore, biologically treated effluent was found to be additionally removed by approximately 64-70%, up to 0.8 mg/L. Consequently, the economic current density using aluminum electrodes for TN and TP treatment from domestic wastewater was ≤ 5 mA/㎠ for a reaction time of 3 min. N and P removal process using aluminum electrodes has little impact on temperature and can be applied to the biologically treated wastewater. Therefore, the process could be implemented in small-scale wastewater treatment plants or where it is difficult to secure a large site.

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