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Lignite-Derived Humic Substances for Treatment of Acid Mine Drainage

机译：褐煤衍生的腐殖质用于酸性矿山排水的处理

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Acid mine drainage (AMD) generated by some coal mines in New Zealand is currently neutralized by thenaddition of alkaline reagents, triggering the precipitation of dissolved metals as insoluble hydroxides. This studyninvestigated the addition of lignite-derived humic substances (HSs) before, during, and after neutralization ofnAMD based on two Stockton Mine treatment scenarios: the Blackwater Treatment Plant (BTP) and the MangatininStream-Sump (MSS). Supernatant samples collected during the sedimentation period were analyzed for basicnwater quality parameters: turbidity and suspended solids (SSs). The BTP scenario used calcium hydroxiden[Ca(OH)2] neutralization, resulting in low supernatant turbidity ( < 2 NTU, nephelometric turbidity units) andnSSs ( < 5 mg/L) regardless of the HS addition sequence. The MSS scenario used calcium carbonate (CaCO3)nneutralization, and showed HS dosing enhanced flocculation and sedimentation of residual CaCO3 SSs whennadded after neutralization, resulting in up to 75% reduction in SSs compared to CaCO3 neutralization alone.nWhen added after neutralization (pH 7), HSs remained dissolved and were incorporated into settling metalnprecipitates as an organic coating, promoting the coagulation of undissolved CaCO3 by charge neutralization.nImprovement in water quality was optimized at shorter residence times (0.5–6 h) and smaller HS doses (5–n20 mg/L). Addition of HSs before (pH 2.6) and during (pH 4.5) neutralization resulted in the formation of HSnprecipitates, which probably acted as nucleation sites for adsorption and coprecipitation of metal hydroxides,nresulting in good incorporation of HSs into floc, but rendering HSs unavailable for coagulation of residualnCaCO3 at pH 7. This article shows that incorporation of HSs into AMD treatment is more advantageous fornCaCO3 than Ca(OH)2 neutralization with respect to water quality, and presents a novel method for improvingnthe water quality of CaCO3-neutralized AMD.
机译：新西兰某些煤矿产生的酸性矿井排水（AMD）目前通过添加碱性试剂来中和，从而触发溶解的金属作为不溶的氢氧化物沉淀。这项研究基于两种斯托克顿矿的处理方案：黑水处理厂（BTP）和MangatininStream-Sump（MSS），在中和nAMD之前，期间和之后研究了褐煤衍生的腐殖质（HSs）的添加。分析沉淀期间收集的上清液样品的基本水质参数：浊度和悬浮固体（SSs）。 BTP方案使用氢氧化钙[Ca（OH）2]中和，导致较低的上清液浊度（<2 NTU，浊度单位浊度）和nSS（<5 mg / L），与HS添加顺序无关。 MSS方案使用碳酸钙（CaCO3）中和，并显示中和后加入HS会增强残留CaCO3 SS的絮凝和沉降，与单独的CaCO3中和相比，最多可减少75％SS.n当中和后添加（pH 7） ，HS保持溶解状态，并作为有机涂层加入沉淀的金属沉淀物中，通过电荷中和促进未溶解的CaCO3的凝结。在较短的停留时间（0.5–6 h）和较小的HS剂量（5–n20 mg）下，水质得到了优化。 / L）。在（pH 2.6）和中和（pH 4.5）期间添加HS会导致HSn沉淀物的形成，这可能是金属氢氧化物吸附和共沉淀的成核位点，导致HSs很好地掺入絮凝物中，但使HSs无法用于pH值为7时残留nCaCO3的凝结。本文显示，就水质而言，将HSs掺入AMD处理对nCaCO3的作用比对Ca（OH）2中和作用更有利，并提出了一种改善CaCO3中和的水质的新方法。

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