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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Toxic aqueous discharge of iron and sulphur from spoiled coal mined lands and its control by phytostabilization process
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Toxic aqueous discharge of iron and sulphur from spoiled coal mined lands and its control by phytostabilization process

机译：富含腐败的煤矿土地的铁和硫的有毒水排放及其对植物化过程的控制

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摘要

Toxic aqueous discharge of iron and sulphur due to acid mine drainage causes soil and water pollution. Many countries with unoperating as well as functional mining industries face this problem. In north-eastern India, coal mining has severely degraded much of the agricultural land by impairing soil, plant diversity and water quality. A study was conducted in coal mined out area of Jaintia hills, Meghalaya (northeastern India) to eliminate toxic aqueous discharge (iron and sulphur) and restore the soil fertility of affected land for sustainable crop production. The treatment of acid mine drainage through phytostabilization and soil amendment with agricultural lime and organic manures reduced sulphate from 22 to 5 mg kg(-1) and soluble iron from 476 to 109 mg kg(-1) of surface soil. The soil pH increased by 1.4 unit from its initial value and concentration of plant nutrients like N, P, K and microbial biomass content reached optimum fertility levels. Soluble iron and sulphate in drainage water reduced considerably by 26% and 49% respectively, with concurrent increases in water pH (3.2 to 7.2). Rice grain yield in the mined out area reached about 1320 kg ha(-1) after reclamation as compared 1920 kg ha(-1) in non-mined area. The adaptation of native plant species (Citrus reticulate, Prunus napalensis and Pyrus communis) was about 70%. Afforestation with native fruit plant species and ferns/grasses, soil amendment using lime and organic manure, and channelling of seepage water for checking acid mine drainage contamination of water bodies and crop fields were some of the measures that were effective in mitigating toxicity. Phytostabilization helped in reversing the trend and restoring soil fertility and plant growth due to a rise in soil organic matter, nutrient availability as well as biological activities.
机译：由于酸性矿渗流引起土壤和水污染而导致的熨斗和硫的有毒水排放。许多未交易和功能采矿行业的国家面临着这个问题。在印度东北部，煤炭开采通过损害土壤，植物多样性和水质，严重降级了大部分农业土地。一项研究是在梅吉拉山（东北北部）的煤矿区煤矿区进行，以消除有毒水排放（熨斗和硫），并恢复受灾土地的土壤肥力，可持续作物生产。通过植物肥料和土壤修正用农业石灰和有机土壤修正治疗酸性矿石引流从476至109mg kg（-1）表面土壤中将硫酸盐降低。土壤pH从其初始值和植物营养浓度增加1.4个单位，如N，P，K和微生物生物量含量达到最佳生育率水平。排水水中可溶性铁和硫酸盐分别降低了26％和49％，水pH（3.2至7.2）同时增加。在非开采面积中，在填充后，在填充后的稻米籽粒产量达到约1320kg ha（-1）左右。天然植物物种（柑橘网状物，Prunus Napalensis和Pyrus Communis）的适应约为70％。用原生水果植物物种和蕨类植物/草地，采用石灰和有机粪便的土壤修正，以及用于检查水体和作物田间的渗水水的渗水污染的渗流是有效的毒性有效的一些措施。由于土壤有机质，营养可用性和生物活性的增加，植物化有助于逆转趋势和恢复土壤肥力和植物生长。

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