| 马保国,胡振琪.污泥和粉煤灰覆盖煤矸石山防治污染的模拟试验研究[J].农业环境科学学报,2014,33(8):1553-1559. |
| 污泥和粉煤灰覆盖煤矸石山防治污染的模拟试验研究 |
| Simulation Experiment on Control of Coal Gangue Pollution Using Sewage-sludge and Fly Ash Covering |
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| DOI：10.11654/jaes.2014.08.013 |
| 中文关键词: 煤矸石 酸矿水 市政污泥 粉煤灰 重金属污染 |
| 英文关键词: coal gangue acid mine drainage sewage sludge fly ash heavy metal contamination |
| 基金项目: |
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| 摘要点击次数: 2220 |
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| 中文摘要: |
| 采用3个柱淋溶模拟试验，研究污泥和粉煤灰覆盖煤矸石降低酸性排水污染的效果。试验结果表明：污泥和粉煤灰覆盖煤矸石后其淋溶液pH值由2.0升至7.5左右，Eh值分别降低到50、200 mV以下，EC值均降低到2.0 mS·cm-1，重金属镉、铜、铅、镍和锌的浓度降到0.002 mg·L-1以下，硫酸盐和铁的污染得到有效控制。这主要因为污泥和粉煤灰的碱性、吸附作用及其中硫酸盐还原菌的作用促进了Fe等氢氧化物沉淀和多种重金属硫化物及碳酸盐的沉淀固定，pH值呈中性或微碱性能够阻止嗜酸硫氧化细菌对黄铁矿的微生物催化氧化。污泥和粉煤灰覆盖煤矸石可以明显地抑制煤矸石中硫化物氧化产生的酸和重金属污染，其中污泥覆盖5 cm的修复效果更好。 |
| 英文摘要: |
| Column leaching tests were conducted to explore the effects of sewage-sludge and fly ash covering on controlling acid and heavy metal contamination from coal gangues. Covering with sewage-sludge and fly ash significantly increased pH values but decreased Eh, EC, Fe and SO2-4 concentrations in the drainage, thus reducing concentrations of heavy metals profoundly. Concentrations of cadmium, copper, iron，lead, nickel and zinc were all lower than 0.002 mg·L-1. Additions of sewage-sludge and fly ash prevented the oxidation of sulfide in coal gangues, increased the alkalinity and adsorption, decreased the population of Thiobacillus ferrooxidans, thus enhancing immobilization of heavy metals via precipitation of sulfide and carbonate through biological（SRB） sulfate reduction, and reducing the oxidation process of sulfide through iron coating on the surface of sulfide. The results indicate that sewage-sludge and fly ash could effectively prevent acid-mine drainage and heavy metal contamination from coal gangues in situ treatment systems, and that covering with 5 cm thick sludge shows the greatest controlling effects. |
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