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Language: korean

Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received November 27, 2012
Accepted December 23, 2012

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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하수종말처리장의 인 처리시설에 티탄염 응집제 적용 및 슬러지 재활용

Application of Ti-salt Coagulant and Sludge Recycling for Phosphorus Removal in Biologically Treated Sewage Effluent

김종범 박희주¹ 이기원¹ 조아라¹ 김명완¹ 이영준 박세민 이광영¹ 손호경² 김종호^†

Jong Beom Kim Hee-Ju Park¹ Ki Won Lee¹ A Ra Jo¹ Myung Wan Kim¹ Young Jun Lee Se Min Park Kwang Young Lee¹ Ho Kyong Shon² Jong-Ho Kim^†

전남대학교 응용화학공학부, 촉매연구소, 500-757 광주광역시 북구 용봉동 300 ¹(주)빛과환경, 500-460 광주광역시 북구 월출동 970-5 ²시드니공과대학교 토목환경공학부, 브로드웨이, 뉴샤우스 웨일즈, 2007 호주

School of Applied Chemical Engineering and The Research Institute for Catalysis, Chonnam National University, 300 Yongbong-dong, Buk-gu, Gwangju 500-757, Korea ¹Photo & Environmental Technology Co., Ltd., 970-5 Woulchul-dong, Buk-gu, Gwangju 500-460, Korea ²Faculty of Engineering, University of Technology, Sydney, P.O. Box 123. Broadway, NSW 2007, Australia

jonghkim@chonnam.ac.kr

Korean Chemical Engineering Research, April 2013, 51(2), 257-262(6), 10.9713/kcer.2013.51.2.257 Epub 21 May 2013

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Abstract

부영양화 방지를 위하여 규제되는 총인(Total-phosphorous, T-P) 농도가 0.2~2 mg/L 이하로 변경됨에 따라, 응집 처리 과정에서 인의 제거를 시도하게 되었다. 따라서 본 연구는 실제 하수종말처리장의 생물학적 처리수를 시료로 하여 티탄염 농도, pH 등의 인자가 인 제거에 미치는 특성에 대하여 검토하였다. 또한 실제 현장에서 가장 많이 사용되는 침강식 침전조와 가압부상식 침전조에 티탄염을 적용하여 인 제거 효율 및 슬러지 활용 가능성을 조사하였다. 응집제로 티탄염을 사용하는 경우 인 제거효율이 기존에 사용하는 황산 알루미늄(Al2(SO4)3, Alum)과 유사하였다. 하향 침강방식의 침전조와 가압부상방식의 침전조 모두 기준치 이하로 모두 현장 적용이 가능하였다. 생성된 산화티탄의 성분은 원수에 포함된 무기물과 투입된 티탄염 성분으로 구성되었다. 티탄염 응집 후 생성된 슬러지를 소성하여 산화티탄을 제조하였다. 시판되고 있는 P-25 제품과 유사한 광촉매 활성을 가지고 있어 슬러지에서 생성된 산화티탄도 기존에 사용하는 제품시장에 대체 사용이 가능할 것으로 판단된다.

As the regulation of total phosphorus (T-P) concentration in biologically treated sewage effluent is_x000D_ reduced to 0.2~2 mg/L, flocculation process is recommended to remove T-P. In this study, the performance of Tisalt coagulant was investigated in terms of dosage and pH in removing phosphorus and the collected sludge after Ti-salt flocculation was calcined to produce titania for effective sludge recycling. The flocculation performance was carried out using two methods: sedimentation and air floatation. Both methods were feasible to apply for Tisalt flocculation. Ti-salt flocculation was effective in reducing phosphorus concentration in sewage effluent, which_x000D_ showed similar performance of alum (Al2(SO4)3). The calcined sludge was recycled to titania which is the widely used metal oxide. Titania produed from Ti-salt sludge indicated similar charateristics of commercially-available P-25 in regard to photocatalytic activity and surface area. Therefore, this can be easily adopted to titania application by replacing P-25.

Keywords

Phosphorus Ti-salt Coagulant Wastewater Sludge Recycling Titania

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