Juwarkar Asha A, Jambhulkar Hemlata P
Environmental Biotechnology Division, National Environmental Engineering Research Institute, Nehru Marg, Nagpur 440 020, India.
Bioresour Technol. 2008 Jul;99(11):4732-41. doi: 10.1016/j.biortech.2007.09.060. Epub 2007 Nov 5.
Field experiment was conducted on mine spoil dump on an area of 10 ha, to restore the fertility and productivity of the coal mine spoil dump using integrated biotechnological approach. The approach involves use of effluent treatment plant sludge (ETP sludge), as an organic amendment, biofertilizers and mycorrihzal fungi along with suitable plant species. The results of the study indicated that amendment with effluent treatment plant sludge (ETP sludge), @ 50 ton/ha improved the physico-chemical properties of coal mine spoil. Due to biofertilizer inoculation different microbial groups such as Rhizobium, Azotobacter and VAM spores, which were practically absent in mine spoil improved greatly. Inoculation of biofertilizer and application of ETP sludge helped in reducing the toxicity of heavy metals such as chromium, zinc, copper, iron, manganese lead, nickel and cadmium, which were significantly reduced to 41%, 43%, 37%, 37%, 34%, 39%, 37% and 40%, respectively, due to the increased organic matter content in the ETP sludge and its alkaline pH (8.10-8.28), at which the metals gets immobilized and translocation of metals is arrested. Thus, amendment and biofertilizer application provided better supportive material for anchorage and growth of the plant on coal mine spoil dump.
在一个10公顷的煤矿废石场上进行了田间试验，采用综合生物技术方法来恢复煤矿废石场的肥力和生产力。该方法包括使用污水处理厂污泥（ETP污泥）作为有机改良剂、生物肥料和菌根真菌以及合适的植物物种。研究结果表明，以50吨/公顷的用量施用污水处理厂污泥（ETP污泥）改善了煤矿废石的物理化学性质。由于接种了生物肥料，煤矿废石中原本几乎不存在的不同微生物群体，如根瘤菌、固氮菌和VA菌根孢子数量大幅增加。接种生物肥料和施用ETP污泥有助于降低铬、锌、铜、铁、锰、铅、镍和镉等重金属的毒性，由于ETP污泥中有机质含量增加及其碱性pH值（8.10 - 8.28），这些重金属分别显著降低了41%、43%、37%、37%、34%、39%、37%和40%，在这种pH值下金属被固定，金属的迁移被阻止。因此，改良和施用生物肥料为植物在煤矿废石场上的锚固和生长提供了更好的支撑材料。
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