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Alkaline injection technology: Field demonstration

机译:碱性注射技术:现场演示

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摘要

In December 2001, 2225 tonnes of fluidized bed combustion (FBC) ash were injected into an abandoned coal mine in eastern Oklahoma. Post-injection monitoring continued for 24 months, during which the mine system appeared to be reestablishing equilibrium with CO_2 in the mine headspace. Alkalinity and pH gradually increased, and as of December 2003 were roughly 65 ppm and 7.3, respectively. Metal concentrations were still significantly lower than pre-injection levels, but iron and manganese concentrations had increased from non-detect levels shortly after injection to roughly 30 ppm and 1.25 ppm, respectively. Aluminum, nickel, and zinc were less than pre-injection concentrations and did not appear to be increasing (roughly
机译:2001年12月,向俄克拉荷马州东部一个废弃的煤矿注入了2225吨流化床燃烧(FBC)灰。注入后的监测持续了24个月,在此期间,矿井系统似乎正在与矿顶空间中的CO_2建立平衡。碱度和pH值逐渐增加,截至2003年12月分别约为65 ppm和7.3。金属浓度仍大大低于注射前的水平,但铁和锰的浓度已从注射后不久的未检测到的水平分别增加到大约30 ppm和1.25 ppm。铝,镍和锌均低于注射前浓度,并且似乎没有增加(分别约为PQL,0.02 ppm和0.1 ppm)。砷和硼的浓度未得到保护淡水水生生物的关注。但是,硒远高于标准连续浓度和最大污染物含量。在接收环境的底栖生境恢复和鱼类物种返回方面,观察到了明显的改善。但是,需要额外的监视来确定治疗的持续时间并评估治疗技术的适用性。

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