[논문]알럼 응집을 이용한 광산폐기물 적치장 침출수 내 불소 제거 연구

이상우; 이우춘; 김성희; 정상헌; 이보영; 이상환; 김순오

doi:10.22807/kjmp.2023.36.1.19

알럼 응집을 이용한 광산폐기물 적치장 침출수 내 불소 제거 연구
A Study on the Removal of Fluorine from Leachate of Reclaimed Mine Waste Dump Site Using Alum Coagulation 원문보기

광물과 암석 = Korean journal of mineralogy and petrology, v.36 no.1, 2023년, pp.19 - 32

이상우 ((주)호성 HS환경기술연구소) , 이우춘 ((주)호성 HS환경기술연구소) , 김성희 ((주)호성 HS환경기술연구소) , 정상헌 ((주)호성 HS환경기술연구소) , 이보영 (한국광해광업공단 경인지사) , 이상환 (한국광해광업공단 경인지사) , 김순오 (경상대학교 자연과학대학 지질과학과 및 기초과학연구소)

초록
AI-Helper

본 연구에서는 S광산의 광산폐기물 적치장 침출수에 함유된 불소의 처리를 위해(1) Ca계 물질을 이용한 공침법; (2) 활성탄과 비산회를 이용한 흡착법; (3) 알럼을 이용한 응집침전법 등을 이용한 불소(초기 농도 9.5 mg/L) 제거 실험을 수행하였다. Ca계 물질을 이용한 공침법의 경우 최대 65.6%, 활성탄 흡착법 27.9%, 비산회 흡착법 71.5%, 알럼을 이용한 응집침전법은 최대 96.6%의 불소 제거 효율을 보였다. 또한 불소의 제거에 있어 높은 제거 효율을 보인 알럼을 이용하여 모의 침출수를 대상으로 실험실 내 반응조에서 수행한 연속 처리 공정 가능성 검토결과, 저농도(6.4 mg/L), 고농도(15.7 mg/L) 모의 침출수를 불소의 국내 청정 지역 배출수 허용 기준인 3 mg/L이하로 처리하는 것이 가능한 것으로 나타났다. 또한 벤치 규모 반응조 운영을 통한 현장 불소 제거 실험 결과, 적정한 운영 및 관리를 하는 경우 불소의 방류수 수질기준을 만족시킬 수 있음을 확인하였다.

Abstract ▼ AI-Helper

This study was conducted to remove fluorine (F) (initial concentration of 9.5 mg/L) from leachate of reclaimed mine waste dump site via different methods: (1) co-precipitation using Ca-based materials; (2) adsorption using activated carbon and fly ash; and (3) coagulation and sedimentation using alum. The F removal efficiencies of each case were estimated as 65.6% (Ca co-precipitation), 27.9% (adsorption of activated carbon), 71.5% (adsorption of fly ash), and 96.6% (alum coagulation and sedimentation). In addition, the applicability of the continuous treatment process using alum coagulation was evaluated by lab-scale experiments using simulated mine drainage containing F of lower (6.4 mg/L) and higher (15.7 mg/L) concentrations, and it was confirmed that the treatment of both cases met the domestic standard (below 3 mg/L) for discharged water in clean areas. Furthermore, the results of bench-scale field tests indicated that the water quality standard of discharged water could be satisfied with the proper operation and management of the process.

주제어

표/그림 (13)

그림 Fig. 1. The schematic diagram of S mine leachate purification facility. A: oxidation and precipitation pond; B: the 1^st sedimentation pond; C: the 2^nd sedimentation pond; D: filtration pond; E: retention and stabilization pond.
그림 Fig. 2. The design of a lab-scale reactor. (a) a floor plan and (b) a side view.
표 Table 1. Experimental conditions for fluorine removal
표 Table 2. Monitoring results of S mine leachate
그림 Fig. 3. A bench-scale facilities implemented in the field site. (a) a schematic diagram, (b) a photography, (c) control panel, and (d) pH displays.
그림 Fig. 4. Variations in fluorine concentration during the co-precipitation process according to reaction time. (a) Ca(OH), (b) CaCl₂, (c) CaCO₃, (d) gypsum, and (e) limestone.
그림 Fig. 5. Variations in fluorine concentration during the co-precipitation process according to pH. (a) gypsum and (b) limestone.
그림 Fig. 6. Variations in fluorine concentration during the adsorption process according to reaction time. (a) activated carbon and (b) fly ash.
그림 Fig. 7. Variations in fluorine concentration during the adsorption process according to pH. (a) activated carbon and (b) fly ash.
그림 Fig. 8. Variations in fluorine concentration during the coagulation and sedimentation process according to (a) reaction time, (b) pH, and (c) dosage.
그림 Fig. 9. Variations in pH and fluorine concentration during the lab-scale experiments on coagulation and sedimentation process. (a) at a lower initial F concentration (6.4 mg/L) reaction and (b) at a higher initial F concentration (15.7 mg/L).
그림 Fig. 10. Sampling points in the bench-scale experiments in the field site.
그림 Fig. 11. Variations in (a) fluorine concentration and (b) pH during the coagulation and sedimentation process tested in the bench-scale experiments in the field site.

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