Abstract
Laboratory experiments were conducted to investigate disinfection as well as removal of color and residual organics from reclaimed municipal wastewater by electrochemical processes with Nb/Pt anode installed. RNO was rapidly bleached by OH$\cdot$ and the second order rate constants of RNO removal were $\frac{0.223l}{mg{\cdot}min}$, $\frac{1.679l}{mg{\cdot}min}$ and $\frac{2.322l}{mg{\cdot}min}$ with for 5 A, 10 A, and 15 A, respectively, with r$^2$ of > 96%. In batch electrochemical processes, after 15 min at currency of 15 A and initial pH of 5, 7,5 and 9, COD$_{Mn}$ was below 4 mg/L, color unit below 5 degree and general bacteria was not detected, the concentration of which are suitable for drinking water regulation. In the continuous electrochemical process, with HRT of 3.7$\sim$49.2 min, free chlorine were 0.2$\sim$0.7 mg/L, general bacteria was not detected, color unit below 5 degree and THMs was 0.017 mg/L. Therefore, electrochemical process with Nb/Pt anode was employed satisfactory to meet for reusing biologically treated water as well as disinfection.
본 연구는 생활하수 최종처리수의 색도, 잔류 유기물질 제거 및 소독에 관한 연구를 Nb/Pt Anode 전극으로 구성된 전기분해장치를 이용하여 수행하였다. RNO는 OH$\cdot$에 의하여 빠르게 탈색시키며, 전류세기 5 A, 10 A, 15 A에서 RNO의 2차 분해속도는 각각 $\frac{0.223l}{mg{\cdot}min}$, $\frac{1.679l}{mg{\cdot}min}$, $\frac{2.322l}{mg{\cdot}min}$로 96% 이상의 r$^2$ 조사되었다. 회분식 전기분해장치에서 전류세기 15 A와 초기 pH 5, 7.5, 9일 때 15분 후 COD$_{Mn}$ 농도는 4 mg/L 미만, 색도는 5도 미만, 일반세균은 불검출로 먹는물 수질 기준값으로 조사되었다. 전기분해 연속 시스템의 HRT 3.7$\sim$49.2분에서 유리염소는 0.2$\sim$0.7 mg/L, 일반세균은 불검출, 색도는 5도 미만과 THMs는 0.017 mg/L이다. 그러므로 Nb/Pt anode 전기분해 공정은 소독뿐만 아니라 생물학적 처리수의 재이용 기술로 적용될 수 있다.
