KSCE Journal of Civil and Environmental Engineering Research (대한토목학회논문집)

Korean Society of Civil Engeneers (대한토목학회)
권호 표지

Electrochemical Treatment of Wastewater Containing Reactive Dyes and Evaluation of the Effluent

반응성염료 폐수의 전기분해 처리와 처리수 수질 평가

Yu, Jae-Jeong;Min, Kyung-Sok;Park, Jeong-Min;Seo, Jeong-Kwan
유재정;민경석;박정민;서정관

  • Published : 2003.01.31

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Abstract

An electrochemical method using $Ti/IrO_2$ anode for the treatment of a wastewater containing reactive dyes was investigated. The method alone or in combination with coagulation was compared with a several physico-chemical processes, such as NaClO oxidation, Fenton oxidation, and coagulation. Toxicity and biodegradability of the treated effluents were also evaluated in terms of $G_L$ value and COD/BOD ratio. The COD removal efficiency by the electrochemical method was 75.9% under the condition of $3 A/dm^2$ of current density and 4 g/L. of NaCl, and 99.1% under the condition of $7 A/ dm^2$ of current density and 16 g/L of NaCl. As results of luminotoxicity test by the luminescent bacteria Vibrio ficheri, the $G_L$ value of untreated wastewater was 128 and it was reduced to 48 after 40 minute of reaction time. The toxicity of effluent was initially reduced, but increased at reaction time long a than 1 hr due to the formation of chloroorganics.

반응성 염료폐수가 염소이온 존재 하에 $Ti/IrO_2$ 양극을 이용한 전기화학적인 방법으로 처리되었다. 전기화학적인 처리 방법은 다른 처리방법, 즉, NaClO를 이용한 화학적인 처리방법, $FeCl_2$를 응집제로 이용한 물리 화학적인 처리방법, Fenton 산화법에 의한 처리, 그리고 전기분해 처리와 물리 화학적인 처리법을 병행한 혼합공정 결과 등과 비교되었다. 처리수는 Lumistox test에 의한 독성실험과 VOCs의 생성여부 및 생분해성 실험 등을 통해 환경성이 평가되었다. 실험결과 전기분해의 COD 제거율은 전류밀도 $3 A/dm^2$, NaCl농도 4 g/L에서 75.9%이었으며, 전류밀도 $7 A/dm^2$, NaCl 농도 16g/L에서 99.1%이었다. 처리수의 독성은 전기분해 처리로 인하여 감소하였으나 1시간 이상의 긴 반응시간에 의해서는 염소화합물질의 생성으로 인해 독성이 다소 증가하고 처리수의 생분해성도 약간 감소하였다.

Keywords

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