Manganese coprecipitation/adsorption behaviour and sludge volume ratios in chemical treatment systems for mine drainage: a review of the literature and a pilot‐scale experiment

Abstract

Manganese removal at lower pH and sludge volume in settling ponds are some of the major issues affecting chemical treatment systems for mine drainage. First, Fe and Al existing in mine drainage coprecipitate with and/or adsorb Mn. Eight chemical treatment facilities were reviewed from literature and a pilot‐scale experiment was also conducted in the Daedeok mine in South Korea. The Mn/(Fe + Al) ratio revealed a positive linear relationship with the lowest pH at discharge, and regression lines were generated. This relationship may be used to predict the pH required to remove Mn considering coprecipitation/adsorption. Second, the ratios of the generation rate of sludge to the required settling volume at five semi‐active treatment facilities were evaluated from literature. This ratio is referred to as the sludge‐settling volume ratio, which can be used as one of the factors in deciding between semi‐active and active treatment systems.

Removal of Manganese from Mine Drainages by the Passive Slag Reactor and Active Treatment System: Proposals for the Design of Treatment Facilities

“…한편, 망가니즈의 섭취 는 신경계에 영향을 주며 학생들의 지적 발달에 손상을 일 으킬 수 있다고 보고되었다 (USEPA, 2004;Bouchard et al, 2011;Rodríguez-Barranco et al, 2013). 그러나 망가니즈는 황화물로 석출되거나 흡착되기 어려 운 화학종이며 (Kim et al, 2017a;Younger et al, 2002), (수)산화물로 석출되기 위해서는 9.5~10.0 이상의 높은 pH 가 필요하다 (Hem, 1963;Younger et al, 2002 (Hem, 1963;Lovett, 1992;Boughriet et al, 1995;Cravotta, 1998;Skousen et al, 2000;Kim et al, 2018a (Qiu et al, 2012;Mauthoor et al, 2014;Piatak et al, 2015;Park et al, 2016;Branca et al, 2020;Teo et al, 2020). 미국에서는 25년 전부터 제강슬래그를 활용한 SLB(slag leach bed)를 광산배수 처리용으로 사용해 왔다 (Ziemkiewicz, 1998;Hamilton et al, 2007;Skousen et al, 2017 (MIRECO, 2015(MIRECO, , 2016(MIRECO, , 2020Kim et al, 2017bKim et al, , 2018bKim et al, , 2019 (Smith, 1999).…”

“…(Kim et al, 2017b). 태우탄광 (Kim et al, 2018a) using data from Ackman (2000), Zinck and Griffith (2013), Kim et al (2014), andMIRECO (2014).…”

“…3. Relationship between the molar ratio of Mn/(Fe+Al) at inflow and the pH at discharge from the data of chemical treatment facilities(Kim et al, 2018a) using data fromAckman (2000),Zinck and Griffith (2013),Kim et al (2014), andMIRECO (2014).…”

“…서 pH 8.9인 경우 망가니즈 농도가 1.0 mg/L로 저감되었으 며, 침전조를 거친 방류수에서는 pH가 8.7으로 다소 저감 되었으나 배출허용기준(8.6)은 초과하였다(MIRECO, 2014;Kim et al, 2018a). (Fe+Al)/Mn 몰비는 12.5의 값을 보였다(Table 2).…”