응집-자체여과를 활용한 광산배수 슬러지 특성별 탈수공정 평가
Assessment of Dewatering Process Using Flocculation and Self-filtration According to Characteristics of Mine Drainage Sludge
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초록
토목섬유 재질 튜브 등의 응집-자체여과 공정으로 다양한 광산배수 및 정화시설별 슬러지를 현장 실증규모에서 탈수하는 실험을 수행하였다. 1일간 탈수유량과 초기 슬러지 체적의 상관관계는 탈수 용기의 형태, 재질보다 슬러지 특성이 주요한 탈수인자임을 지시하였으며, 이의 기울기는 슬러지별 농축 특성인자로 활용될 수 있다. 자연정화시설에서는 약 1일만에 슬러지 함수율이 80% 이하로 저감되어 높은 농축효율을 보였다. 이는 철 수산화물의 표면 부착성장에 따른 슬러지 입경 증대와 입단화로 배수능이 향상된 결과로 판단된다. 오염물질이 주로 아연, 망가니즈인Semi-active 처리시설 슬러지의 농축효율이 낮았는데, 정전기적 반발력보다는 다공질 미세구조에 따른 배수, 농축 저항성이 그 원인으로 판단된다. 자연정화시설에서 단순공정으로 유연하게 슬러지를 농축하는 방안은 향후 사업 적용성도 높을 것으로 기대된다.
Abstract
Geotube and geobag made from geo-synthetics were applied to various mine drainage treatment facilities at pilot scale. Relationship between discharge rate of filtrate for 1 day and initial volume of sludge indicated characteristics of sludge rather than dewatering material and its shape are principal dewatering factors. And the slope of the relationship may be utilized as a parameter of compaction characteristic of sludge. High efficiency of sludge concentration was shown at passive treatment systems, resulting in water content of <80% in 1 day. This may be resulted from oxidation on particle surface, increase in particle size, aggregation and enhancement of dewaterability. Dewaterability was low at a semi-active system producing Zn-Mn sludge. This may be due to porous micro-structure and resistivity of dewatering and compression rather than electrostatic repulsive power. This flexible and simple sludge dewatering system has applicability especially for passive treatment system.
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